/* =========================================
   GLOBAL RESET & CORE THEME VARIABLES
   ========================================= */
:root {
  color-scheme: light;
  --font-sans: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-serif: "DM Serif Display", Georgia, serif;
  --font-mono: "Google Sans Code", ui-monospace, SFMono-Regular, Menlo, monospace;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-6: 24px;
  --space-8: 32px;
  --space-12: 48px;
  --space-16: 64px;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-2xl: 24px;
  --radius-full: 999px;

  --duration-fast: 120ms;
  --duration-normal: 180ms;
  --duration-slow: 280ms;
  --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
  --ease-standard: cubic-bezier(0.4, 0, 0.2, 1);

  --slate-1: #fcfcfd;
  --slate-2: #f9f9fb;
  --slate-3: #f0f0f3;
  --slate-4: #e8e8ec;
  --slate-5: #e0e1e6;
  --slate-6: #d9d9e0;
  --slate-7: #cdced6;
  --slate-8: #b9bbc6;
  --slate-9: #8b8d98;
  --slate-10: #80838d;
  --slate-11: #60646c;
  --slate-12: #1c2024;

  --marian-1: #f8fafd;
  --marian-2: #f1f6ff;
  --marian-3: #e5efff;
  --marian-4: #d5e7ff;
  --marian-5: #c4dcff;
  --marian-6: #afceff;
  --marian-7: #93bbff;
  --marian-8: #6ea0ff;
  --marian-9: #1d3f8f;
  --marian-10: #2d51a2;
  --marian-11: #3968d4;
  --marian-12: #0b2a79;
  --marian-a1: #3096fe05;
  --marian-a2: #f1f6ff;
  --marian-a3: #e5efff;
  --marian-a4: #d5e7ff;
  --marian-a5: #c4dcff;
  --marian-a6: #afceff;
  --marian-a7: #93bbff;
  --marian-a8: #6ea0ff;
  --marian-a9: #002681e2;
  --marian-a10: #012d8ed2;
  --marian-a11: #013ec8c6;
  --marian-a12: #002073f4;

  --green-3: #e6f6eb;
  --green-4: #d6f1df;
  --green-5: #c4e8d1;
  --green-6: #adddc0;
  --green-7: #8eceaa;
  --green-8: #5bb98b;
  --green-9: #30a46c;
  --green-10: #2b9a66;
  --green-11: #218358;
  --green-12: #193b2d;
  --red-3: #feebec;
  --red-4: #ffdbdc;
  --red-5: #ffcdce;
  --red-6: #fdbdbe;
  --red-7: #f4a9aa;
  --red-8: #eb8e90;
  --red-9: #e5484d;
  --red-10: #dc3e42;
  --red-11: #ce2c31;
  --red-12: #641723;
  --amber-3: #fff7c2;
  --amber-4: #ffee9c;
  --amber-5: #fbe577;
  --amber-6: #f3d673;
  --amber-7: #e9c162;
  --amber-8: #e2a336;
  --amber-9: #ffc53d;
  --amber-10: #ffba18;
  --amber-11: #ab6400;
  --amber-12: #4f3422;
  --purple-3: #f7edfe;
  --purple-4: #f2e2fc;
  --purple-5: #ead5f9;
  --purple-7: #d1afec;
  --purple-9: #8e4ec6;
  --purple-10: #8347b9;
  --purple-11: #8145b5;
  --teal-9: #12a594;

  --background: var(--slate-1);
  --foreground: var(--slate-12);
  --card: color-mix(in srgb, var(--slate-2) 82%, transparent);
  --card-foreground: var(--foreground);
  --popover: var(--slate-2);
  --popover-foreground: var(--foreground);
  --primary: var(--marian-9);
  --primary-foreground: #ffffff;
  --secondary: var(--slate-3);
  --secondary-foreground: var(--foreground);
  --muted: var(--slate-3);
  --muted-foreground: var(--slate-11);
  --accent: var(--primary);
  --accent-foreground: var(--primary-foreground);
  --destructive: var(--red-9);
  --destructive-foreground: var(--red-12);
  --success: var(--green-9);
  --success-foreground: var(--green-12);
  --warning: var(--amber-9);
  --warning-foreground: var(--amber-12);
  --border: var(--slate-6);
  --input: var(--slate-7);
  --ring: var(--marian-8);
  --chart-1: var(--primary);
  --chart-2: var(--success);
  --chart-3: var(--warning);
  --chart-4: var(--destructive);
  --chart-5: var(--teal-9);
  --camera-surface: #050505;
  --camera-feed: #000000;
  --camera-foreground: var(--slate-9);
  --overlay-scrim: #0000007a;
  --overlay-sheet: #0000008c;
  --camera-inset-shadow: inset 0 4px 12px #00000033;
  --topic-r: var(--purple-11);
  --shadow-sm: 0 2px 8px rgba(15, 18, 25, 0.06);
  --shadow-md: 0 12px 32px rgba(15, 18, 25, 0.08);
  --shadow-lg: 0 20px 48px rgba(15, 18, 25, 0.16);

  --bg-body: var(--background);
  --bg-glass: var(--card);
  --bg-card: color-mix(in srgb, var(--slate-2) 58%, transparent);
  --border-glass: var(--border);
  --text-primary: var(--foreground);
  --text-secondary: var(--muted-foreground);
  --accent-hover: var(--marian-10);
  --accent-glow: color-mix(in srgb, var(--marian-9) 24%, transparent);
  --shadow: var(--shadow-md);

  /* Status Colors */
  --status-success-bg: var(--green-3);
  --status-success-border: var(--green-7);
  --status-success-text: var(--green-11);

  --status-duplicate-bg: var(--red-3);
  --status-duplicate-border: var(--red-7);
  --status-duplicate-text: var(--red-11);

  --status-pending-bg: var(--amber-3);
  --status-pending-border: var(--amber-7);
  --status-pending-text: var(--amber-11);

  --status-idle-bg: var(--muted);
  --status-idle-border: var(--border);
  --status-idle-text: var(--muted-foreground);

  --bg-hover: var(--slate-4);
  --vh: 1vh;
}

re-icon {
  flex-shrink: 0;
}

[data-theme="dark"] {
  color-scheme: dark;
  --slate-1: #111113;
  --slate-2: #18191b;
  --slate-3: #212225;
  --slate-4: #272a2d;
  --slate-5: #2e3135;
  --slate-6: #363a3f;
  --slate-7: #43484e;
  --slate-8: #5a6169;
  --slate-9: #696e77;
  --slate-10: #777b84;
  --slate-11: #b0b4ba;
  --slate-12: #edeef0;

  --marian-1: #0a111e;
  --marian-2: #101828;
  --marian-3: #11254c;
  --marian-4: #0f2e69;
  --marian-5: #17397c;
  --marian-6: #22478e;
  --marian-7: #2c56a5;
  --marian-8: #3566c5;
  --marian-9: #70a2ff;
  --marian-10: #6596f2;
  --marian-11: #83b3ff;
  --marian-12: #cee2ff;
  --marian-a1: #0012fd0c;
  --marian-a2: #065ffc17;
  --marian-a3: #1164fe3e;
  --marian-a4: #0c61ff5d;
  --marian-a5: #1f6bfd72;
  --marian-a6: #3279ff85;
  --marian-a7: #3d81ff9e;
  --marian-a8: #4182fec1;
  --marian-a9: #70a2ff;
  --marian-a10: #6a9efff1;
  --marian-a11: #83b3ff;
  --marian-a12: #cee2ff;

  --green-3: #132d21;
  --green-4: #113b29;
  --green-5: #174933;
  --green-6: #20573e;
  --green-7: #28684a;
  --green-8: #2f7c57;
  --green-9: #30a46c;
  --green-10: #33b074;
  --green-11: #3dd68c;
  --green-12: #b1f1cb;
  --red-3: #3b1219;
  --red-4: #500f1c;
  --red-5: #611623;
  --red-6: #72232d;
  --red-7: #8c333a;
  --red-8: #b54548;
  --red-9: #e5484d;
  --red-10: #ec5d5e;
  --red-11: #ff9592;
  --red-12: #ffd1d9;
  --amber-3: #302008;
  --amber-4: #3f2700;
  --amber-5: #4d3000;
  --amber-6: #5c3d05;
  --amber-7: #714f19;
  --amber-8: #8f6424;
  --amber-9: #ffc53d;
  --amber-10: #ffd60a;
  --amber-11: #ffca16;
  --amber-12: #ffe7b3;
  --purple-3: #301c3b;
  --purple-4: #3d224e;
  --purple-5: #48295c;
  --purple-7: #664282;
  --purple-9: #8e4ec6;
  --purple-10: #9a5cd0;
  --purple-11: #d19dff;
  --teal-9: #12a594;

  --background: var(--slate-1);
  --foreground: var(--slate-12);
  --card: color-mix(in srgb, var(--slate-2) 82%, transparent);
  --card-foreground: var(--foreground);
  --popover: var(--slate-2);
  --popover-foreground: var(--foreground);
  --primary: var(--marian-9);
  --primary-foreground: var(--marian-1);
  --secondary: var(--slate-3);
  --secondary-foreground: var(--foreground);
  --muted: var(--slate-3);
  --muted-foreground: var(--slate-11);
  --destructive: var(--red-9);
  --destructive-foreground: var(--red-3);
  --success: var(--green-9);
  --success-foreground: var(--green-3);
  --warning: var(--amber-9);
  --warning-foreground: var(--amber-3);
  --border: var(--slate-6);
  --input: var(--slate-7);
  --ring: var(--marian-8);
  --chart-1: var(--primary);
  --chart-2: var(--success);
  --chart-3: var(--warning);
  --chart-4: var(--destructive);
  --chart-5: var(--teal-9);
  --camera-surface: #050505;
  --camera-feed: #000000;
  --camera-foreground: var(--slate-9);
  --overlay-scrim: #0000007a;
  --overlay-sheet: #0000008c;
  --topic-r: var(--purple-11);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.22);
  --shadow-md: 0 12px 32px rgba(0, 0, 0, 0.34);
  --shadow-lg: 0 20px 48px rgba(0, 0, 0, 0.46);

  --bg-body: var(--background);
  --bg-glass: var(--card);
  --bg-card: color-mix(in srgb, var(--slate-2) 58%, transparent);
  --border-glass: var(--border);
  --text-primary: var(--foreground);
  --text-secondary: var(--muted-foreground);
  --accent: var(--primary);
  --accent-hover: var(--marian-10);
  --accent-glow: color-mix(in srgb, var(--marian-9) 24%, transparent);
  --shadow: var(--shadow-md);

  --status-success-bg: var(--green-3);
  --status-success-border: var(--green-7);
  --status-success-text: var(--green-11);

  --status-duplicate-bg: var(--red-3);
  --status-duplicate-border: var(--red-7);
  --status-duplicate-text: var(--red-11);

  --status-pending-bg: var(--amber-3);
  --status-pending-border: var(--amber-7);
  --status-pending-text: var(--amber-11);

  --status-idle-bg: var(--muted);
  --status-idle-border: var(--border);
  --status-idle-text: var(--muted-foreground);
  --bg-hover: var(--slate-4);
}

@supports (color: color(display-p3 1 1 1)) {
  @media (color-gamut: p3) {
    :root:not([data-theme="dark"]),
    [data-theme="light"] {
      --marian-1: oklch(98.4% 0.0047 263.8);
      --marian-2: oklch(97.1% 0.0137 263.8);
      --marian-3: oklch(94.9% 0.0286 263.8);
      --marian-4: oklch(92.6% 0.0533 263.8);
      --marian-5: oklch(89.4% 0.0768 263.8);
      --marian-6: oklch(85.1% 0.0986 263.8);
      --marian-7: oklch(79.6% 0.127 263.8);
      --marian-8: oklch(72.1% 0.174 263.8);
      --marian-9: oklch(39.4% 0.1387 263.8);
      --marian-10: oklch(45.4% 0.1387 263.8);
      --marian-11: oklch(54.4% 0.174 263.8);
      --marian-12: oklch(32.4% 0.1387 263.8);
      --marian-a1: color(display-p3 0.0118 0.502 0.9961 / 0.016);
      --marian-a2: color(display-p3 0.9098 0.9412 0.9961 / 0.5);
      --marian-a3: color(display-p3 0.0078 0.3843 0.9922 / 0.084);
      --marian-a4: color(display-p3 0.0039 0.3882 0.9961 / 0.143);
      --marian-a5: color(display-p3 0.0039 0.3529 0.9725 / 0.203);
      --marian-a6: color(display-p3 0.0039 0.3373 0.9647 / 0.282);
      --marian-a7: color(display-p3 0.0039 0.3176 0.949 / 0.385);
      --marian-a8: color(display-p3 0 0.2902 0.9569 / 0.52);
      --marian-a9: color(display-p3 0 0.1137 0.4627 / 0.854);
      --marian-a10: color(display-p3 0 0.1333 0.5176 / 0.79);
      --marian-a11: color(display-p3 0 0.1882 0.7373 / 0.731);
      --marian-a12: color(display-p3 0 0.0902 0.4078 / 0.921);
    }

    [data-theme="dark"] {
      --marian-1: oklch(17.9% 0.0286 261.9);
      --marian-2: oklch(20.9% 0.0336 261.9);
      --marian-3: oklch(27.2% 0.0768 261.9);
      --marian-4: oklch(31.7% 0.1104 261.9);
      --marian-5: oklch(36.3% 0.121 261.9);
      --marian-6: oklch(41.2% 0.1265 261.9);
      --marian-7: oklch(46.7% 0.1368 261.9);
      --marian-8: oklch(52.8% 0.1573 261.9);
      --marian-9: oklch(71.8% 0.1466 261.9);
      --marian-10: oklch(68.1% 0.1466 261.9);
      --marian-11: oklch(77.1% 0.1466 261.9);
      --marian-12: oklch(90.8% 0.0535 261.9);
      --marian-a1: color(display-p3 0 0.0706 0.9882 / 0.043);
      --marian-a2: color(display-p3 0.1137 0.3882 1 / 0.085);
      --marian-a3: color(display-p3 0.1529 0.4118 1 / 0.229);
      --marian-a4: color(display-p3 0.1373 0.3843 1 / 0.348);
      --marian-a5: color(display-p3 0.2039 0.4235 1 / 0.428);
      --marian-a6: color(display-p3 0.2667 0.4784 0.9961 / 0.5);
      --marian-a7: color(display-p3 0.3098 0.5137 1 / 0.598);
      --marian-a8: color(display-p3 0.3216 0.5176 1 / 0.729);
      --marian-a9: color(display-p3 0.498 0.651 0.9961 / 0.971);
      --marian-a10: color(display-p3 0.4745 0.6353 0.9961 / 0.916);
      --marian-a11: color(display-p3 0.5686 0.7176 1 / 0.975);
      --marian-a12: color(display-p3 0.8353 0.8941 1 / 0.988);
    }
  }
}

* { 
  box-sizing: border-box; 
  margin: 0; padding: 0;
}

body, 
.glass-container, 
#login-input, 
.topic-selector-btn-large, 
.active-topic-bar, 
.queue-row, 
.modal-content {
  transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}

body {
  width: 100%;
  height: 100vh;
  height: calc(var(--vh, 1vh) * 100);
  height: 100dvh;
  background-color: var(--bg-body);
  color: var(--text-primary);
  font-family: var(--font-sans);
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: center;
  padding: max(var(--space-4), env(safe-area-inset-top)) 0 max(var(--space-4), env(safe-area-inset-bottom));
  overflow: hidden;
  position: relative;
}

button,
input,
select,
textarea {
  font: inherit;
}

button,
[role="button"],
a,
input,
select,
textarea {
  -webkit-tap-highlight-color: transparent;
}

button,
.nav-item,
.topic-selector-btn-large,
.confirm-btn,
.upload-photo-btn,
.upload-cancel-btn,
.upload-confirm-btn {
  min-height: 44px;
  border-radius: var(--radius-md);
}

button:disabled,
.upload-confirm-btn:disabled,
.upload-cancel-btn:disabled {
  cursor: not-allowed;
  color: var(--slate-9) !important;
  background: var(--slate-3) !important;
  border-color: var(--slate-6) !important;
  opacity: 1 !important;
  transform: none !important;
  box-shadow: none !important;
}

#login-input,
#class-selector,
#search-input {
  min-height: 44px;
  font-size: 1rem;
  background: var(--slate-2);
  border-color: var(--input);
  border-radius: var(--radius-md);
  color: var(--foreground);
}

#login-input:focus,
#class-selector:focus,
#search-input:focus {
  border-color: var(--marian-8);
  box-shadow: 0 0 0 3px var(--ring);
}

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border-width: 0;
}

/* =========================================
   GLASS CONTAINER
   ========================================= */
.glass-container {
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow);
  padding: var(--space-6);
  width: min(92%, 420px);
  max-height: 94vh;
  display: flex; flex-direction: column;
  position: relative; z-index: 10;
  overflow: hidden;
}

#app-container {
  max-height: calc(var(--vh, 1vh) * 100 - 100px);
}

#app-container:is(.state-selection, .state-scanning, .state-profile) {
  flex: 1 1 0;
  min-height: 0;
  max-height: 768px;
}

#app-container.state-auth {
  margin-block: auto;
}

.app-section {
  display: none;
  flex-direction: column;
  width: 100%;
}

/* =========================================
   STATE TRANSITION CLASSES
   ========================================= */
.glass-container.state-auth #login-section { display: flex; }

.glass-container.state-selection #main-app-section { display: flex; flex-direction: column; flex: 1; min-height: 0; overflow: hidden; }
.glass-container.state-selection #selection-panel { display: flex; flex-direction: column; }
.glass-container.state-selection #scanning-panel { display: none; }
.glass-container.state-selection { padding-top: var(--space-4); padding-bottom: var(--space-3); }

.glass-container.state-scanning #main-app-section { display: flex; flex-direction: column; flex: 1; min-height: 0; overflow: hidden; }
.glass-container.state-scanning #selection-panel { display: none; }
.glass-container.state-scanning #scanning-panel { display: flex; flex-direction: column; flex: 1; gap: var(--space-4); min-height: 0; overflow: visible; }
.glass-container.state-scanning { padding: var(--space-4) 0 var(--space-3); }

.glass-container.state-profile {
  padding: var(--space-4) 0 0;
}

.glass-container.state-profile #profile-view {
  display: flex;
  flex: 1;
  min-height: 0;
  overflow: hidden;
}

.app-section[hidden] {
  display: none;
}

/* =========================================
   LOGIN SCREEN STYLES
   ========================================= */
.login-header-branding {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
}
.login-header-branding img {
  margin-right: 16px;
}

.input-wrapper {
  position: relative; width: 100%; margin-bottom: 1rem;
}

#login-input {
  width: 100%; padding: 0.85rem 3rem 0.85rem 1.25rem; font-size: 1rem;
  background: var(--slate-2); border: 1px solid var(--slate-7); border-radius: 12px;
  color: var(--text-primary); outline: none;
}
#login-input:focus {
  border-color: var(--marian-8);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.password-toggle-icon {
  position: absolute; top: 50%; right: 1rem; transform: translateY(-50%);
  cursor: pointer; color: var(--text-secondary);
}

#login-success-icon {
  position: absolute; top: 50%; right: 3rem; transform: translateY(-50%);
  color: var(--status-success-text); animation: fadeIn 0.3s;
}

#login-btn {
  position: relative;
  width: 100%; padding: 0.75rem; background: var(--primary); color: var(--primary-foreground);
  border: none; border-radius: var(--radius-md); font-size: 1.05rem; font-weight: 600;
  cursor: pointer; display: flex; align-items: center; justify-content: center;
  margin-bottom: 1rem;
  box-shadow: 0 0 12px var(--accent-glow);
  transition: background-color var(--duration-normal) var(--ease-standard),
              opacity var(--duration-fast) var(--ease-out),
              transform var(--duration-fast) var(--ease-out);
}
#login-btn re-icon {
  position: absolute;
  right: 0.85rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.45rem;
}
#login-btn:hover {
  background: var(--accent-hover);
}
#login-btn:active:not(:disabled) { transform: scale(0.98); }

#login-footer {
  text-align: center; font-size: 0.85rem; margin-top: 0.5rem;
}
.login-version-span {
  font-family: var(--font-mono);
  color: var(--text-secondary);
  opacity: 0.75;
}
#login-footer a {
  color: var(--accent); text-decoration: none; font-weight: 500;
}
.login-version-divider {
  color: var(--text-secondary); margin: 0 6px; opacity: 0.5;
}
#login-version {
  color: var(--text-secondary); opacity: 0.8;
}

.login-error-message {
  padding: 0.75rem 1rem; background: var(--status-duplicate-bg);
  color: var(--status-duplicate-text); border: 1px solid var(--status-duplicate-border);
  border-radius: 10px; margin-bottom: 1rem; font-size: 0.85rem; text-align: center;
  animation: shake 0.4s;
}

/* =========================================
   MAIN APP & HEADER STYLES
   ========================================= */
.header-container {
  display: flex; align-items: center; justify-content: center;
  padding-bottom: 1rem; border-bottom: 1px solid var(--border-glass);
  margin-bottom: 1rem;
  transition: opacity 0.25s cubic-bezier(0.4, 0, 0.2, 1),
              visibility 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.app-shell-header {
  display: none;
  grid-template-columns: 48px fit-content(16rem);
  gap: 12px;
  width: 100%;
  padding: 0 1.25rem 1rem;
  margin-bottom: 0;
  flex-shrink: 0;
  justify-content: center;
}

#main-app-section,
#profile-view {
  padding-top: 1rem;
}

.glass-container.state-selection .app-shell-header,
.glass-container.state-scanning .app-shell-header,
.glass-container.state-profile .app-shell-header {
  display: grid;
}

.header-logo {
  height: 48px; width: auto; margin-right: 12px;
}
.app-shell-header .header-logo { margin-right: 0; }
.app-shell-header .header-text { min-width: 0; }
.header-text h1 {
  font-family: var(--font-serif); font-size: calc(1.15rem + 4px); font-style: italic; font-weight: 400; color: var(--text-primary);
  line-height: 1.2;
}
#app-view-title:focus { outline: none; box-shadow: none; }
.header-text h2, .header-text h3 {
  font-family: var(--font-sans); font-size: 0.75rem; font-weight: 400; color: var(--text-secondary);
  letter-spacing: normal; margin-top: 2px;
}
.app-shell-header .header-text h2 { white-space: nowrap; }

/* =========================================
   STATE 1: TOPIC SELECTION PANEL
   ========================================= */
.instruction-box {
  background: var(--accent-glow); border-radius: 12px;
  padding: 0.85rem; display: flex; gap: 10px;
  margin-bottom: 1.5rem; align-items: flex-start;
}
.instruction-box re-icon { color: var(--accent); font-size: 1.25rem; }
.instruction-box p { font-size: 0.8rem; color: var(--text-primary); line-height: 1.4; }

.topic-selector-btn-large {
  width: 100%; padding: 1.25rem; background: var(--slate-3);
  border: 2px dashed var(--marian-7); border-radius: 14px;
  color: var(--marian-11); font-size: 1rem; font-weight: 600;
  display: flex; justify-content: space-between; align-items: center;
  cursor: pointer; text-align: left;
  transition: transform 0.2s ease, background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}
.topic-selector-btn-large:hover {
  background: var(--slate-4);
  border-color: var(--marian-8);
  transform: translateY(-2px);
}

.topic-selector-label {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.topic-selector-label re-icon {
  flex-shrink: 0;
  font-size: 1.2rem;
}

/* =========================================
   STATE 2: ACTIVE SCANNING PANEL
   ========================================= */
.active-topic-bar {
  background: var(--slate-2); border: 1px solid var(--slate-7);
  padding: 0.65rem 0.85rem; border-radius: 10px;
  min-height: 44px;
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 0.5rem;
  cursor: pointer;
  transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.1s ease;
  flex-shrink: 0;
}
.active-topic-bar:hover {
  border-color: var(--marian-8);
  background-color: var(--slate-4);
}
.active-topic-bar:active {
  transform: scale(0.98);
}
.topic-info {
  display: flex; align-items: center; gap: 8px; font-size: 0.8rem;
  flex: 1; min-width: 0;
}
.topic-info re-icon { color: var(--accent); font-size: 1.1rem; }
#active-topic-name {
  overflow: hidden;
  color: var(--text-primary);
  font-weight: 500;
  text-overflow: ellipsis;
  white-space: nowrap;
}

#reader-container {
  width: clamp(180px, min(calc(38vh + 40px), calc(100vh - 448px)), 340px);
  width: clamp(180px, min(calc(38dvh + 40px), calc(100dvh - 448px)), 340px);
  max-width: 100%;
  aspect-ratio: 1 / 1;
  height: auto;
  border-radius: var(--radius-xl);
  overflow: hidden; position: relative; border: 1px solid var(--border-glass);
  background: var(--camera-surface); box-shadow: var(--camera-inset-shadow);
  margin: auto;
  pointer-events: none;
  flex-shrink: 0;
  min-width: 180px;
  min-height: 180px;
}
#reader { width: 100%; height: 100%; object-fit: cover; }

#reader-container::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 4;
  pointer-events: none;
  background: var(--camera-feed);
  opacity: 0;
  transition: opacity var(--duration-fast) var(--ease-standard);
}

#reader-container.scan-inactive::after { opacity: 0.8; }

.reader-flash {
  position: absolute;
  inset: 0;
  z-index: 5;
  pointer-events: none;
  opacity: 0.35;
  transition: opacity 0.4s ease;
}
.reader-flash.success { background: var(--success); }
.reader-flash.duplicate { background: var(--warning); }
.reader-flash.error { background: var(--destructive); }

#camera-loader {
  position: absolute; top: 0; left: 0; width: 100%; height: 100%;
  background: var(--camera-surface); display: flex; flex-direction: column;
  justify-content: center; align-items: center; color: var(--camera-foreground);
  font-size: 0.8rem; gap: 12px; z-index: 10;
}

/* =========================================
   COMPACT HISTORY / QUEUE LIST
   ========================================= */
#queue-history-panel {
  position: relative;
  flex: 0 0 auto; display: flex; flex-direction: column;
  width: calc(100% - 2.5rem);
  min-height: 112px;
  overflow: visible; margin: 0 auto 0.25rem;
}

.queue-list-container.horizontal-carousel {
  position: relative;
  z-index: 2;
  overflow-x: auto;
  overflow-y: hidden;
  display: flex;
  flex-direction: row;
  gap: 12px;
  padding: 0 5%;
  box-sizing: border-box;
  scroll-snap-type: x mandatory;
  scrollbar-width: none;
  -ms-overflow-style: none;
  flex: 1 1 auto;
  min-height: 0;
  width: 100%;
  background: var(--bg-glass);
  border-radius: var(--radius-md);
  transition: transform var(--duration-normal) var(--ease-standard);
}
.queue-list-container.horizontal-carousel.bulk-delete-dragging { transition: none; }
.queue-list-container.horizontal-carousel::-webkit-scrollbar {
  display: none;
}
.queue-list-container.horizontal-carousel .queue-row {
  flex: 0 0 90%;
  scroll-snap-align: center;
  box-sizing: border-box;
  margin-bottom: 0;
}

.queue-empty-state {
  width: 100%;
  min-height: 80px;
  padding: var(--space-3);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  color: var(--text-secondary);
  text-align: center;
}

.queue-empty-icon {
  width: 40px;
  height: 40px;
  margin-bottom: 4px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-md);
  background: var(--accent-glow);
  color: var(--accent);
}

.queue-empty-icon re-icon { font-size: 1.35rem; }
.queue-empty-state strong { color: var(--text-primary); font-size: 0.8rem; }
.queue-empty-state > span:last-child { font-size: 0.7rem; }

/* Row Item */
.queue-row {
  position: relative;
  display: flex; align-items: center; justify-content: space-between;
  min-width: 0;
  padding: 8px 52px 8px 14px; border-radius: 12px; background: var(--bg-body);
  border: 1px solid var(--border-glass);
}
.queue-row.success { border-color: var(--green-7); }
.queue-row.duplicate { border-color: var(--amber-7); }
.queue-row.error { border-color: var(--red-7); }
.queue-row.processing, .queue-row.pending { border-color: var(--marian-7); }

.student-info { display: flex; align-items: center; gap: 12px; flex: 1; min-width: 0; overflow: hidden; }

.student-photo {
  width: 56px; height: 56px; border-radius: var(--radius-sm); background: var(--border-glass);
  object-fit: cover; border: 2px solid var(--bg-glass);
  box-shadow: var(--shadow-sm);
  flex-shrink: 0;
}

.history-dismiss-btn {
  position: absolute;
  top: 0;
  right: 2px;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding: 0 10px 0 0;
  border: 0;
  border-radius: var(--radius-full);
  background: transparent;
  color: var(--destructive);
  font: 600 1rem/1 Inter, sans-serif;
  cursor: pointer;
  transition: transform var(--duration-fast) var(--ease-standard);
}

.history-dismiss-btn span {
  display: block;
}

.history-dismiss-btn:hover { opacity: 0.72; }

.history-dismiss-btn:active { transform: scale(0.92); }

.history-dismiss-btn:focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 1px;
}

.student-text { display: flex; flex: 1; flex-direction: column; gap: 2px; min-width: 0; overflow: hidden; }
.student-name {
  overflow: hidden;
  color: var(--text-primary);
  font-size: 0.9rem;
  font-weight: 600;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.student-topic {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent);
}
.student-id {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-secondary);
  opacity: 0.8;
}

.status-badge {
  font-size: 0.7rem; font-weight: 700; padding: 4px 8px; border-radius: 6px;
  text-transform: uppercase;
}
.status-badge.success { background: var(--green-3); border: 1px solid var(--green-7); color: var(--green-12); }
.status-badge.duplicate { background: var(--amber-3); border: 1px solid var(--amber-7); color: var(--amber-12); }
.status-badge.error { background: var(--red-3); border: 1px solid var(--red-7); color: var(--red-11); }
.status-badge.processing { background: var(--marian-3); border: 1px solid var(--marian-7); color: var(--marian-11); }
.status-badge.pending { background: var(--slate-3); border: 1px solid var(--slate-6); color: var(--slate-11); }

/* =========================================
   MODALS
   ========================================= */
.modal-content {
  background: var(--popover);
  color: var(--popover-foreground);
  border-top-left-radius: var(--radius-xl); border-top-right-radius: var(--radius-xl);
  padding: 1.25rem; max-height: 80vh;
  display: flex; flex-direction: column;
  border-top: 1px solid var(--border-glass);
  box-shadow: var(--shadow-lg);
}
.modal-content h3 { font-family: var(--font-serif); font-size: calc(1.15rem + 4px); font-style: italic; font-weight: 400; text-align: center; margin-bottom: 0.85rem; }

/* =========================================
   SPINNERS
   ========================================= */
#login-loader {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--overlay-scrim);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 9999;
  justify-content: center;
  align-items: center;
}

.spinner {
  width: 28px;
  height: 28px;
  color: var(--accent);
}

.app-spinner { display: block; color: var(--accent); }

/* =========================================
   FOOTER & BOTTOM BRANDING
   ========================================= */
.app-footer {
  width: 100%; padding-top: var(--space-3);
  border-top: 1px solid var(--border-glass);
  text-align: center; font-size: 0.65rem; color: var(--text-secondary);
  margin-top: auto;
}
.footer-link { color: var(--accent); text-decoration: none; font-weight: 500; }
#footer-version { font-family: var(--font-mono); }

.branding-text {
  text-align: left; font-size: 0.9rem; color: var(--text-secondary); line-height: 1.3;
}
.branding-text div:first-child {
  font-size: 0.95rem;
}

/* =========================================
   ANIMATIONS & EFFECTS
   ========================================= */
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes shake {
  10%, 90% { transform: translateX(-2px); }
  20%, 80% { transform: translateX(3px); }
  30%, 50%, 70% { transform: translateX(-4px); }
  40%, 60% { transform: translateX(4px); }
}

/* =========================================
   ACCESSIBILITY KEYBOARD FOCUS STATES
   ========================================= */
button:focus-visible, 
input:focus-visible, 
select:focus-visible,
textarea:focus-visible,
a:focus-visible,
[role="button"]:focus-visible,
.nav-item:focus-visible,
.queue-row:focus-visible,
.student-accordion-header:focus-visible,
.upload-dropzone:focus-visible,
.carousel-dot:focus-visible,
.upload-preview-close:focus-visible,
.topic-selector-btn-large:focus-visible,
.active-topic-bar:focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 2px;
}

/* =========================================
   TOAST / SNACKBAR NOTIFICATIONS
   ========================================= */
.toast-container {
  position: fixed;
  top: auto;
  bottom: max(16px, env(safe-area-inset-bottom));
  left: 50%;
  transform: translateX(-50%);
  display: grid;
  align-items: end;
  z-index: 1000;
  width: 90%;
  max-width: 350px;
  pointer-events: none;
  isolation: isolate;
}

.toast {
  --toast-bg: var(--marian-3);
  --toast-border: var(--marian-7);
  --toast-text: var(--marian-11);
  position: relative;
  grid-area: 1 / 1;
  width: 100%;
  min-width: 0;
  min-height: 44px;
  box-sizing: border-box;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: 6px 46px 6px 10px;
  border-radius: 12px;
  background: color-mix(in srgb, var(--toast-bg) 72%, transparent);
  backdrop-filter: blur(20px) saturate(1.2);
  -webkit-backdrop-filter: blur(20px) saturate(1.2);
  border: 1px solid var(--toast-border);
  box-shadow: var(--shadow-lg);
  color: var(--text-primary);
  font-size: 0.85rem;
  font-weight: 500;
  pointer-events: auto;
  opacity: 0;
  transform: translateY(12px) scale(0.98);
  transform-origin: bottom center;
  transition: opacity var(--duration-slow) var(--ease-standard),
              transform var(--duration-slow) var(--ease-standard);
}

[data-theme="dark"] .toast {
  box-shadow: var(--shadow-lg);
}

.toast.show {
  opacity: 1;
  transform: translateY(0) scale(1);
}

.toast.hide {
  opacity: 0;
  transform: translateY(8px) scale(0.98);
}

.toast.show:nth-last-child(2) {
  opacity: 0.82;
  transform: translateY(-8px) scale(0.97);
}

.toast.show:nth-last-child(3) {
  opacity: 0.62;
  transform: translateY(-16px) scale(0.94);
}

.toast.show:nth-last-child(4) {
  opacity: 0.42;
  transform: translateY(-24px) scale(0.91);
}

.toast-container:is(:hover, :focus-within) .toast.show {
  opacity: 1;
}

.toast-container:is(:hover, :focus-within) .toast.show:nth-last-child(2) {
  transform: translateY(calc(-100% - 8px)) scale(1);
}

.toast-container:is(:hover, :focus-within) .toast.show:nth-last-child(3) {
  transform: translateY(calc(-200% - 16px)) scale(1);
}

.toast-container:is(:hover, :focus-within) .toast.show:nth-last-child(4) {
  transform: translateY(calc(-300% - 24px)) scale(1);
}

.toast-icon {
  width: 20px;
  height: 20px;
  display: grid;
  place-items: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.toast-content {
  min-width: 0;
  flex: 1 1 auto;
  display: flex;
  align-items: center;
  gap: 4px;
}

.toast-badge {
  flex: 0 0 auto;
  padding: 2px 6px;
  border: 1px solid var(--toast-border);
  border-radius: var(--radius-full);
  background: var(--toast-bg);
  color: var(--toast-text);
  font-size: 0.65rem;
  font-weight: 700;
  line-height: 1;
  white-space: nowrap;
}

.toast-separator {
  flex: 0 0 auto;
  color: var(--text-secondary);
  line-height: 1;
}

.toast-message {
  flex: 1 1 auto;
  min-width: 0;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  line-height: 1.4;
}

.toast-action {
  min-height: 36px;
  padding: 0 10px;
  flex-shrink: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--secondary);
  color: var(--secondary-foreground);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: background-color var(--duration-fast) var(--ease-standard),
              border-color var(--duration-fast) var(--ease-standard);
}

.toast-action:hover {
  background: var(--muted);
  border-color: var(--input);
}

.toast-action:focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 2px;
}

.toast-dismiss {
  position: absolute;
  top: 50%;
  right: 1px;
  width: 44px;
  height: 44px;
  min-height: 44px;
  display: inline-grid;
  place-items: center;
  padding: 0;
  border: 0;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--muted-foreground);
  font: inherit;
  font-size: 1.1rem;
  line-height: 1;
  transform: translateY(-50%);
  cursor: pointer;
  transition: background-color var(--duration-fast) var(--ease-standard),
              color var(--duration-fast) var(--ease-standard);
}

.toast-dismiss:hover {
  background: var(--muted);
  color: var(--foreground);
}

.toast-dismiss:focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 2px;
}

/* Toast Variants */
.toast.success {
  --toast-bg: var(--green-3);
  --toast-border: var(--green-7);
  --toast-text: var(--green-11);
}
.toast.success .toast-icon {
  color: var(--toast-text);
}

.toast.error {
  --toast-bg: var(--red-3);
  --toast-border: var(--red-7);
  --toast-text: var(--red-11);
}
.toast.error .toast-icon {
  color: var(--toast-text);
}

.toast.info {
  --toast-bg: var(--marian-3);
  --toast-border: var(--marian-7);
  --toast-text: var(--marian-11);
}
.toast.info .toast-icon {
  color: var(--toast-text);
}

.toast.duplicate {
  --toast-bg: var(--amber-3);
  --toast-border: var(--amber-7);
  --toast-text: var(--amber-11);
}
.toast.duplicate .toast-icon {
  color: var(--toast-text);
}

/* =========================================
   UI ENHANCEMENTS: SCAN CARDS, DETAILED MODALS, FLOATING BTN
   ========================================= */

/* Circular icon badge on scan card rows */
.queue-row .status-badge {
  position: absolute;
  right: 12px;
  bottom: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  padding: 0;
  flex-shrink: 0;
}

.queue-row .status-badge re-icon {
  font-size: 1.15rem;
}

.status-spinner { width: 18px; height: 18px; }

/* Scan history detail drawer */
.student-modal {
  position: fixed;
  inset: auto 0 0;
  width: min(100%, 480px);
  height: auto;
  max-width: 480px;
  max-height: min(78dvh, 520px);
  margin: 0 auto;
  padding: 0;
  border: 0;
  background: transparent;
  z-index: 210;
  overflow: visible;
}

.student-modal[open] { display: block; }
.student-modal:focus { outline: none; }

.student-modal::backdrop {
  background: transparent;
  backdrop-filter: blur(0);
  -webkit-backdrop-filter: blur(0);
  transition: background-color 280ms var(--ease-standard), backdrop-filter 280ms var(--ease-standard);
}

.student-modal.is-open::backdrop {
  background: var(--overlay-scrim);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

.student-modal-content {
  --drawer-offset: 100%;
  width: 100%;
  margin: 0;
  background: var(--popover);
  border-top-left-radius: var(--radius-xl);
  border-top-right-radius: var(--radius-xl);
  padding: 0 1.25rem calc(1.5rem + env(safe-area-inset-bottom));
  max-height: inherit;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--border-glass);
  box-shadow: var(--shadow-lg);
  position: relative;
  transform: translateY(var(--drawer-offset));
  transition: transform 280ms cubic-bezier(0.16, 1, 0.3, 1);
  will-change: transform;
}

.student-modal.is-open .student-modal-content { --drawer-offset: 0px; }
.student-modal.is-dragging .student-modal-content { transition: none; }

.student-modal-header {
  position: relative;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  touch-action: none;
  cursor: grab;
}

.student-modal-header:active { cursor: grabbing; }

.student-modal-swipe-handle {
  position: absolute;
  top: 8px;
  left: 50%;
  width: 40px;
  height: 4px;
  border-radius: var(--radius-full);
  background: var(--border-glass);
  transform: translateX(-50%);
}

.student-modal-body {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  padding: 0.25rem 0;
}

.modal-student-photo {
  width: 110px;
  height: 110px;
  border-radius: 12px;
  object-fit: cover;
  border: 1px solid var(--border-glass);
}

.student-modal-info {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
  flex-grow: 1;
}

.modal-student-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
  text-align: left !important;
}

.modal-student-id {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin: 0;
}

.modal-student-topic {
  font-size: 0.85rem;
  color: var(--accent);
  font-weight: 700;
  margin: 0;
}

.carousel-container-outer {
  position: relative;
  display: flex;
  align-items: center;
  width: 100%;
  min-height: 74px;
}
.carousel-container {
  position: relative;
  isolation: isolate;
  flex: 1;
  overflow: hidden;
}

.bulk-delete-action {
  position: absolute;
  top: 4px;
  bottom: 4px;
  z-index: 1;
  width: 72px;
  display: grid;
  place-items: center;
  border: 0;
  background: var(--destructive);
  color: var(--destructive-foreground);
  font: 600 0.8rem/1 Inter, sans-serif;
  cursor: pointer;
  opacity: 0;
  transition: opacity var(--duration-fast) var(--ease-standard);
}

.bulk-delete-action.start {
  left: 0;
  border-radius: var(--radius-md) 0 0 var(--radius-md);
}

.bulk-delete-action.end {
  right: 0;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.carousel-container.bulk-delete-revealing .bulk-delete-action.active,
.bulk-delete-action:focus-visible {
  z-index: 3;
  opacity: 1;
}

.bulk-delete-action:focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: -3px;
}

/* Carousel Navigation Buttons */
.carousel-nav-btn {
  background: transparent;
  border: none;
  color: var(--text-primary);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  position: absolute;
  z-index: 10;
  transition: color var(--duration-normal) var(--ease-standard), transform var(--duration-fast) var(--ease-standard), background-color var(--duration-normal) var(--ease-standard);
  box-shadow: none;
}
.carousel-nav-btn.prev { left: -6px; }
.carousel-nav-btn.next { right: -6px; }
.carousel-nav-btn:hover {
  background: transparent;
  color: var(--accent);
  transform: scale(1.15);
}
.carousel-nav-btn:active {
  transform: scale(0.9);
}
.carousel-nav-btn[disabled], .carousel-nav-btn.disabled {
  opacity: 0 !important;
  pointer-events: none;
}

/* Simple White Pagination Dots */
.carousel-dots-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  height: 6px;
  min-height: 0;
  flex: 0 0 6px;
  margin: var(--space-3) 0 var(--space-2);
}
.carousel-dot {
  width: 24px;
  height: 24px;
  margin-inline: -2px;
  border-radius: 50%;
  background-color: transparent;
  border: none;
  cursor: pointer;
  position: relative;
}
.carousel-dot::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 6px;
  height: 6px;
  transform: translate(-50%, -50%);
  border-radius: var(--radius-full);
  background: var(--muted-foreground);
  opacity: 0.42;
  transition: width var(--duration-normal) var(--ease-standard),
              background-color var(--duration-normal) var(--ease-standard),
              opacity var(--duration-normal) var(--ease-standard);
}
.carousel-dot.active::before,
.carousel-dot:focus-visible::before {
  width: 18px;
  background: var(--primary);
  opacity: 1;
}

.history-progress-container {
  position: relative;
  width: 100%;
  margin: 0 auto 6px;
}
.progress-bar-row {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  margin: 0 0 4px;
}
.segmented-progress-bar {
  position: relative;
  flex: 1;
  height: 6px;
  border-radius: 3px;
  background: var(--border-glass);
  display: flex;
  overflow: hidden;
}
.segmented-progress-bar.is-loading::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--accent);
  opacity: 0;
  animation: progressBreath 1.5s ease-in-out infinite;
}
.progress-segment {
  height: 100%;
  transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.progress-segment.success { background-color: var(--status-success-text); }
.progress-segment.duplicate { background-color: var(--status-pending-text); }
.progress-segment.error { background-color: var(--status-duplicate-text); }
.progress-segment.pending {
  background-color: var(--accent);
}
@keyframes progressBreath {
  50% { opacity: 0.32; }
}

.progress-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.65rem;
  color: var(--text-secondary);
  font-weight: 500;
}
.legend-item {
  display: flex;
  align-items: center;
  gap: 4px;
}
.legend-item .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  display: inline-block;
}
.legend-item.success .dot { background-color: var(--status-success-text); }
.legend-item.duplicate .dot { background-color: var(--status-pending-text); }
.legend-item.error .dot { background-color: var(--status-duplicate-text); }
.legend-item.pending .dot { background-color: var(--accent); }

/* History Delete Confirmation Overlay */
.confirm-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--popover) 76%, transparent);
  backdrop-filter: blur(16px) saturate(0.8);
  -webkit-backdrop-filter: blur(16px) saturate(0.8);
  border: 1px solid var(--border-glass);
  border-radius: 12px;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 16px;
  box-sizing: border-box;
  opacity: 0;
  transform: translateY(8px) scale(0.98);
  transition: opacity 0.3s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.confirm-overlay.show {
  opacity: 1;
  transform: translateY(0) scale(1);
}

.confirm-content {
  display: flex;
  flex-direction: column;
  width: 100%;
  max-width: 320px;
  align-items: stretch;
  gap: 16px;
}

.confirm-title {
  display: block;
  margin-bottom: 6px;
  font-size: 0.95rem;
  color: var(--text-primary);
}

.confirm-message {
  font-size: 0.8rem;
  line-height: 1.45;
  color: var(--text-secondary);
}

.confirm-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

.confirm-btn {
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 0.75rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: background-color var(--duration-normal) var(--ease-standard),
              border-color var(--duration-normal) var(--ease-standard),
              color var(--duration-normal) var(--ease-standard),
              opacity var(--duration-fast) var(--ease-out),
              transform var(--duration-fast) var(--ease-out);
  border: 1px solid transparent;
}

.confirm-btn.yes {
  background: var(--status-duplicate-bg);
  border: 1px solid var(--status-duplicate-border);
  color: var(--status-duplicate-text);
}

.confirm-btn.yes:hover {
  color: var(--destructive-foreground);
  background: var(--status-duplicate-text);
  border-color: var(--status-duplicate-text);
  transform: translateY(-1px);
}

.confirm-btn.no {
  background: var(--status-idle-bg);
  border: 1px solid var(--status-idle-border);
  color: var(--text-primary);
}

.confirm-btn.no:hover {
  background: var(--bg-hover);
}

.confirm-btn:active:not(:disabled) { transform: scale(0.98); }


/* --- PROFILE ACCORDION STYLES --- */
.profile-selector-container {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: calc(100% + 2.5rem);
  margin-left: -1.25rem;
  margin-right: -1.25rem;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
  margin-bottom: 12px;
  position: sticky;
  top: 0;
  z-index: 10;
  background-color: var(--slate-2);
  border-bottom: 1px solid var(--border-glass);
  transition: background-color 0.3s ease, border-color 0.3s ease;
  padding-top: 5px;
  padding-bottom: 5px;
  margin-top: -5px;
  isolation: isolate;
}

#search-input {
  width: 100%;
  min-height: 44px;
  padding: 0.5rem 0.75rem 0.5rem 2.25rem;
  background: var(--slate-2);
  border: 1px solid var(--slate-7);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.8125rem;
  outline: none;
  transition: border-color var(--duration-normal) var(--ease-standard),
              box-shadow var(--duration-normal) var(--ease-standard);
}

.profile-info-bar {
  width: 100%;
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.profile-search-field {
  position: relative;
  flex: 1 1 auto;
  min-width: 0;
}

.profile-search-field > re-icon {
  position: absolute;
  top: 50%;
  left: var(--space-3);
  z-index: 1;
  color: var(--text-secondary);
  font-size: 1rem;
  transform: translateY(-50%);
  pointer-events: none;
}

.search-combobox {
  position: relative;
  width: 100%;
  flex-shrink: 0;
}

.class-selector-control {
  position: relative;
  isolation: isolate;
  width: 100%;
  margin-bottom: 0;
  background: var(--slate-2);
  border-color: var(--accent);
  box-shadow: 0 0 15px var(--accent-glow);
  color: var(--text-primary);
  font-size: 0.8rem;
  font-weight: 500;
  text-align: left;
}

.class-selector-control::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  border-radius: inherit;
  pointer-events: none;
  box-shadow: 0 0 0 6px var(--accent-glow);
  will-change: opacity, transform;
  animation: pulse-border 2s infinite;
}

.class-selector-control > * { position: relative; z-index: 1; }

.class-selector-control.has-selection::after,
.needs-topic .class-selector-control.has-selection::after { animation: none; }

#topic-combobox-active {
  width: calc(100% - 2.5rem);
  margin-inline: auto;
  margin-bottom: 0;
}

.search-combobox-arrow {
  display: block;
  width: 10px;
  height: 10px;
  margin-right: 4px;
  color: var(--text-secondary);
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg);
  transition: color var(--duration-normal) var(--ease-standard),
              transform var(--duration-normal) var(--ease-standard);
}

.search-combobox-trigger:hover .search-combobox-arrow,
.search-combobox-trigger[aria-expanded="true"] .search-combobox-arrow {
  color: var(--accent);
}

.search-combobox-trigger[aria-expanded="true"] .search-combobox-arrow {
  transform: rotate(-135deg);
}

.search-combobox-popover {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  z-index: 200;
  padding: 8px;
  background: var(--popover);
  color: var(--popover-foreground);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

.search-combobox-popover[hidden] {
  display: none;
}

.search-combobox-search {
  width: 100%;
  min-height: 44px;
  padding: 0.7rem 0.85rem;
  background: var(--slate-2);
  border: 1px solid var(--input);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 1rem;
  outline: none;
}

.search-combobox-search:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--ring);
}

.search-combobox-options {
  display: flex;
  flex-direction: column;
  gap: 2px;
  max-height: min(240px, 40vh);
  margin-top: 6px;
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.topic-combobox-popover .search-combobox-options {
  max-height: min(340px, 52vh);
}

.search-combobox-option {
  width: 100%;
  min-height: 44px;
  padding: 0.7rem 0.85rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  background: transparent;
  color: var(--text-primary);
  border: 0;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  text-align: left;
  cursor: pointer;
}

.search-combobox-option:hover,
.search-combobox-option:focus-visible {
  background: var(--slate-4);
  outline: none;
}

.search-combobox-option[aria-selected="true"] {
  background: var(--marian-3);
  color: var(--marian-12);
}

.search-combobox-option:focus-visible {
  box-shadow: inset 0 0 0 2px var(--marian-8);
}

.search-combobox-check {
  color: var(--accent);
  font-size: 1.1rem;
  opacity: 0;
}

.search-combobox-option[aria-selected="true"] .search-combobox-check {
  opacity: 1;
}

.topic-combobox-popover .search-combobox-option {
  border: 1px solid transparent;
}

.topic-combobox-popover .topic-option-p {
  --topic-special-bg: var(--red-3);
  --topic-special-hover: var(--red-4);
  --topic-special-selected: var(--red-5);
  --topic-special-border: var(--red-7);
  --topic-special-text: var(--red-11);
}

.topic-combobox-popover .topic-option-ki {
  --topic-special-bg: var(--amber-3);
  --topic-special-hover: var(--amber-4);
  --topic-special-selected: var(--amber-5);
  --topic-special-border: var(--amber-7);
  --topic-special-text: var(--amber-12);
}

.topic-combobox-popover .topic-option-r {
  --topic-special-bg: var(--purple-3);
  --topic-special-hover: var(--purple-4);
  --topic-special-selected: var(--purple-5);
  --topic-special-border: var(--purple-7);
  --topic-special-text: var(--purple-11);
}

.topic-combobox-popover :is(.topic-option-p, .topic-option-ki, .topic-option-r) {
  background: var(--topic-special-bg);
  border-color: var(--topic-special-border);
  color: var(--topic-special-text);
}

.topic-combobox-popover :is(.topic-option-p, .topic-option-ki, .topic-option-r):is(:hover, :focus-visible) {
  background: var(--topic-special-hover);
}

.topic-combobox-popover :is(.topic-option-p, .topic-option-ki, .topic-option-r)[aria-selected="true"] {
  background: var(--topic-special-selected);
}

.topic-combobox-popover :is(.topic-option-p, .topic-option-ki, .topic-option-r) .search-combobox-check {
  color: var(--topic-special-text);
}

.search-combobox-empty {
  padding: 1rem 0.85rem;
  color: var(--text-secondary);
  font-size: 0.85rem;
  text-align: center;
}

#search-input:focus {
  border-color: var(--accent);
}

.students-list-container {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
  padding-right: 4px;
  min-height: 0;
  flex: 1 1 auto;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-color: var(--border-glass) transparent;
  scrollbar-width: thin;
}


.students-list-container::-webkit-scrollbar {
  width: 6px;
}
.students-list-container::-webkit-scrollbar-track {
  background: transparent;
}
.students-list-container::-webkit-scrollbar-thumb {
  background: var(--border-glass);
  border-radius: 10px;
}

.student-accordion-item {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: 12px;
  overflow: hidden;
  opacity: 1;
  transform: translateX(0);
  transition: border-color var(--duration-fast) var(--ease-standard), opacity 0.2s ease;
  animation: slideInFromRight 0.5s cubic-bezier(0.16, 1, 0.3, 1) backwards;
  flex-shrink: 0;
}

@media (prefers-reduced-motion: reduce) {
  .student-accordion-item {
    animation: none;
  }
}

@media (hover: hover) and (pointer: fine) {
  .student-accordion-item:hover {
    border-color: var(--input);
  }
}

@keyframes slideInFromRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
}

.student-accordion-header {
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  outline: none;
}

.student-accordion-header:is(.active, .closing) {
  position: absolute;
  top: 0;
  right: 0;
  z-index: 1;
  width: 100%;
  height: 44px;
  min-height: 44px;
  padding: 0 16px;
  justify-content: flex-end;
  background: transparent;
  border-bottom: 0;
}

.student-accordion-header:is(.active, .closing)::after {
  content: "";
  position: absolute;
  top: 40px;
  right: 0;
  left: 0;
  border-top: 1px solid var(--border-glass);
  pointer-events: none;
}

.student-accordion-header:is(.active, .closing):focus-visible {
  outline-offset: -2px;
}

.student-accordion-header:is(.active, .closing):is(:hover, :focus-visible) .expand-arrow {
  opacity: 1;
}

.student-accordion-header:is(.active, .closing) .header-left,
.student-accordion-header:is(.active, .closing) .inactive-badge {
  display: none;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.student-thumb {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  object-fit: cover;
  border: 2px solid var(--border-glass);
}

.student-photo-frame {
  position: relative;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  overflow: hidden;
  background: var(--bg-hover);
  border: 2px solid var(--border-glass);
}

.student-thumb-frame {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
}

.student-photo-large-frame {
  width: 120px;
  height: 150px;
  margin-bottom: 16px;
  border-radius: 12px;
  box-shadow: var(--shadow-md);
}

.profile-photo-spinner {
  position: absolute;
  width: 28px;
  height: 28px;
}

.student-thumb-frame .profile-photo-spinner {
  width: 18px;
  height: 18px;
}

.student-photo-frame :is(.student-thumb, .student-photo-large, .student-thumb-placeholder, .student-photo-placeholder) {
  width: 100%;
  height: 100%;
  margin: 0;
  border: 0;
  border-radius: inherit;
}

.student-photo-frame :is(.student-thumb, .student-photo-large) {
  position: relative;
  opacity: 0;
  transition: opacity var(--duration-fast) var(--ease-out);
}

.student-photo-frame :is(.student-thumb, .student-photo-large).loaded {
  opacity: 1;
}

.student-meta {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.student-name-text {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-primary);
  text-align: left;
  overflow-wrap: anywhere;
}

.student-id-text {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-primary);
  opacity: 0.7;
  text-align: left;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.expand-arrow {
  color: var(--text-primary);
  opacity: 0.7;
  transition: transform 150ms cubic-bezier(0.23, 1, 0.32, 1);
}

.student-accordion-header.active .expand-arrow {
  transform: rotate(180deg);
  transition-duration: 180ms;
}

.student-accordion-body {
  display: grid;
  grid-template-rows: 0fr;
  background: var(--bg-hover);
  overflow: hidden;
  visibility: hidden;
  border-top: 0px solid transparent;
}

.student-accordion-body:is(.expanded, .closing) {
  grid-template-rows: 1fr;
  visibility: visible;
  background: linear-gradient(to bottom, transparent 40px, var(--bg-hover) 40px);
  border-top: 0;
}

.student-accordion-item.skip-transition .student-accordion-body,
.student-accordion-item.skip-transition .student-accordion-inner,
.student-accordion-item.skip-transition .expand-arrow {
  transition: none !important;
}

.student-accordion-inner {
  min-height: 0;
  overflow: hidden;
  padding: 0 20px;
  opacity: 0;
  transform: translateY(-4px);
  transition: opacity 150ms cubic-bezier(0.23, 1, 0.32, 1), transform 150ms cubic-bezier(0.23, 1, 0.32, 1);
}

.student-accordion-body:is(.expanded, .closing) .student-accordion-inner {
  padding: 52px 20px 20px;
}

.student-accordion-body.expanded .student-accordion-inner {
  opacity: 1;
  transform: translateY(0);
  transition-duration: 180ms;
}

.student-detail-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
}

.student-photo-large {
  width: 120px;
  height: 150px;
  border-radius: 12px;
  object-fit: cover;
  border: 2px solid var(--border-glass);
  box-shadow: var(--shadow-md);
  margin-bottom: 16px;
}

.detail-name {
  font-family: var(--font-serif);
  font-size: calc(1.25rem + 4px);
  font-style: italic;
  font-weight: 400;
  color: var(--text-primary);
  margin-bottom: 4px;
  text-align: center;
}

.detail-id {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 16px;
  text-align: center;
}

.detail-info-grid {
  width: 100%;
  border-top: 1px solid var(--border-glass);
  padding-top: 16px;
  display: grid;
  grid-template-columns: max-content minmax(0, 1fr);
  align-items: center;
  gap: 12px 8px;
}

.detail-item {
  display: contents;
}

.detail-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  opacity: 0.6;
  color: var(--text-primary);
  margin-bottom: 0;
  display: flex;
  align-items: center;
  gap: 4px;
}

.detail-icon-inline {
  font-size: 0.9rem !important;
  opacity: 0.8;
}

.detail-value {
  min-width: 0;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-primary);
  overflow-wrap: anywhere;
}

#students-loader {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex: 1;
  min-height: 40vh;
  padding: 30px;
  gap: 12px;
}

/* Summary Box */
.students-summary-container {
  display: flex;
  flex: 0 0 auto;
  flex-direction: column;
  align-items: stretch;
  width: 68px;
  height: 44px;
  gap: 0;
  justify-content: flex-end;
  overflow: hidden;
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  padding: 0;
  margin: 0;
}

.summary-badge {
  flex: 1 1 50%;
  min-width: 0;
  min-height: 0;
  white-space: nowrap;
  display: grid;
  grid-template-columns: 11px 11px 2ch;
  align-items: center;
  justify-content: center;
  column-gap: 3px;
  padding: 0 var(--space-1);
  border: 0;
  border-radius: 0;
  font-size: 0.6875rem;
  font-weight: 600;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.summary-badge re-icon {
  width: 11px;
  height: 11px;
  display: grid;
  place-items: center;
  font-size: 0.6875rem !important;
}

.summary-badge span {
  width: 2ch;
  text-align: center;
  font-variant-numeric: tabular-nums;
}

.summary-badge + .summary-badge {
  border-top: 1px solid var(--border-glass);
}

@media (max-height: 700px) {
  .glass-container:is(.state-selection, .state-scanning) #main-app-section {
    overflow-y: auto;
    overflow-anchor: none;
    overscroll-behavior: contain;
  }

  .glass-container.state-scanning #scanning-panel {
    flex: 0 0 auto;
    min-height: auto;
  }

}

.summary-active {
  background: var(--status-success-bg);
  color: var(--green-12);
}

.summary-inactive {
  background: var(--status-duplicate-bg);
  color: var(--status-duplicate-text);
}

/* Inactive student list cards */
.student-accordion-item.inactive {
  border-style: dashed;
  background: color-mix(in srgb, var(--red-3) 76%, transparent);
  border-color: var(--red-7);
}

.student-accordion-item.inactive:hover {
  border-color: var(--status-duplicate-border);
}

.student-accordion-item.inactive :is(.student-name-text, .student-id-text) {
  color: var(--red-11);
}
[data-theme="light"] .student-accordion-item.inactive .student-thumb-placeholder,
:root:not([data-theme="dark"]) .student-accordion-item.inactive .student-thumb-placeholder {
  opacity: 0.45;
}

/* Inactive group section header */
.inactive-group-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: 10px;
  border: 1px dashed var(--border-glass);
  background: var(--bg-hover);
  user-select: none;
  transition: background 0.2s ease;
  margin-top: 4px;
}
.inactive-group-header:hover {
  background: var(--slate-4);
  border-color: var(--slate-8);
}
.inactive-group-header .inactive-group-arrow {
  margin-left: auto;
  transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  font-size: 0.9rem;
}
.inactive-group-header.open .inactive-group-arrow {
  transform: rotate(180deg);
}

.inactive-group-body {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  overflow: hidden;
}
.inactive-group-body.open {
  grid-template-rows: 1fr;
}
.inactive-group-inner {
  min-height: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-top: 8px;
}

.student-accordion-item[hidden],
.inactive-group-wrapper[hidden],
#students-list > .empty-state[hidden] {
  display: none;
}

.inactive-badge {
  font-size: 0.62rem;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--status-duplicate-bg);
  border: 1px solid var(--status-duplicate-border);
  color: var(--status-duplicate-text);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  display: inline-block;
}

/* Placeholders and states */
.welcome-placeholder, .empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 40px 20px;
  color: var(--text-secondary);
  background: var(--bg-hover);
  border: 1px dashed var(--border-glass);
  border-radius: 16px;
  margin: 10px 0;
}

.welcome-icon, .empty-icon {
  font-size: 3rem !important;
  margin-bottom: 12px;
  color: var(--accent);
  opacity: 0.6;
}

.welcome-placeholder h3 {
  font-family: var(--font-serif);
  font-size: calc(1.1rem + 4px);
  font-style: italic;
  color: var(--text-primary);
  margin-bottom: 8px;
  font-weight: normal;
}

.welcome-placeholder p, .empty-state p {
  font-size: 0.85rem;
  line-height: 1.4;
  max-width: 280px;
  margin: 0 auto;
}

/* User avatar placeholders */
.student-thumb-placeholder {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--bg-hover);
  border: 2px solid var(--border-glass);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
}

.student-thumb-placeholder re-icon {
  font-size: 1.4rem !important;
}

.student-photo-placeholder {
  width: 120px;
  height: 150px;
  border-radius: 12px;
  background: var(--bg-hover);
  border: 2px solid var(--border-glass);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  box-shadow: var(--shadow-md);
  margin-bottom: 16px;
}

.student-photo-placeholder re-icon {
  font-size: 3rem !important;
}

.text-na {
  color: var(--status-duplicate-text);
  font-weight: 500;
}

/* =========================================
   NAVIGATION BAR
   ========================================= */
.app-nav {
  display: flex;
  margin-bottom: 0.75rem;
  gap: 8px;
  width: min(92%, 420px);
  max-width: 420px;
  height: 44px;
  flex-shrink: 0;
  z-index: 10;
}

.nav-tabs {
  position: relative;
  isolation: isolate;
  min-width: 0;
  flex: 1;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-items: stretch;
  padding: 3px;
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow);
}

.nav-tabs::before {
  content: "";
  position: absolute;
  z-index: 0;
  top: 3px;
  bottom: 3px;
  left: 3px;
  width: calc((100% - 6px) / 2);
  border-radius: var(--radius-md);
  background: var(--primary);
  box-shadow: 0 4px 12px var(--accent-glow);
  transform: translateX(0);
  transition: transform var(--duration-normal) var(--ease-standard);
}

body[data-active-view="profile"] .nav-tabs::before {
  transform: translateX(100%);
}

.nav-item {
  min-width: 0;
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 0.55rem 0.6rem;
  border-radius: 12px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-decoration: none;
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-glass);
  transition: color var(--duration-normal) var(--ease-standard), background-color var(--duration-normal) var(--ease-standard), border-color var(--duration-normal) var(--ease-standard), transform var(--duration-fast) var(--ease-standard), box-shadow var(--duration-normal) var(--ease-standard);
  box-shadow: var(--shadow);
  white-space: nowrap;
}

.nav-item re-icon {
  font-size: 1.15rem;
}

.nav-item:hover {
  color: var(--text-primary);
  background: var(--slate-4);
  border-color: var(--slate-8);
  transform: translateY(-1px);
}

.nav-item.active {
  color: var(--primary-foreground) !important;
  background: var(--primary);
  border-color: var(--primary);
  box-shadow: 0 4px 12px var(--accent-glow);
}

.nav-tabs .nav-item,
.nav-tabs .nav-item:hover,
.nav-tabs .nav-item.active {
  position: relative;
  z-index: 1;
  min-height: 0;
  padding-block: 0;
  border: 0;
  border-radius: var(--radius-md);
  background: transparent;
  box-shadow: none;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  transform: none;
}

.nav-tabs .nav-item {
  display: grid;
  grid-template-columns: 1.25rem max-content;
  align-items: center;
  justify-content: center;
  column-gap: 6px;
  transition: color var(--duration-normal) var(--ease-standard);
}

.nav-tabs .nav-item re-icon {
  display: grid;
  place-items: center;
  width: 1.25rem;
  height: 1.25rem;
  line-height: 1;
}

.nav-tabs .nav-item span {
  line-height: 1.25;
}

.nav-item.logout-btn {
  flex: 0 0 auto;
  aspect-ratio: 1 / 1;
  height: 100%;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  color: var(--status-duplicate-text);
  background: var(--status-duplicate-bg);
  border-color: var(--status-duplicate-border);
}

.nav-item.logout-btn:hover {
  color: var(--destructive-foreground);
  background: var(--status-duplicate-text);
  border-color: var(--status-duplicate-text);
  transform: translateY(-1px);
}


/* =========================================
   TOPIC NOT SELECTED DIMMING STATE
   ========================================= */
.needs-topic #reader-container,
.needs-topic #queue-history-panel {
  opacity: 0.2;
  pointer-events: none;
  filter: blur(1.5px);
  transition: all 0.3s ease;
}

.needs-topic .active-topic-bar {
  border-color: var(--accent);
  box-shadow: 0 0 15px var(--accent-glow);
}

@keyframes pulse-border {
  0%, 100% { opacity: 0.45; transform: scale(1); }
  70% { opacity: 0; transform: scale(1.035); }
}

/* =========================================
   PAGE ENTRY ANIMATIONS (SHADCN STYLED)
   ========================================= */
@keyframes enterAnimation {
  from {
    opacity: 0;
    transform: scale(0.985) translateY(6px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

.glass-container.state-auth #login-section {
  animation: enterAnimation 0.3s cubic-bezier(0.16, 1, 0.3, 1) both;
}

/* =========================================
   PROFILE PAGE CUSTOM LAYOUT
   ========================================= */
#profile-view .profile-selector-container {
  top: 0;
  width: 100%;
  margin-left: 0;
  margin-right: 0;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
  padding-left: 1.25rem;
  padding-right: 1.25rem;
  padding-top: 0;
  padding-bottom: var(--space-3);
  margin-top: 0;
}

#profile-view .profile-selector-container::before {
  content: "";
  position: absolute;
  inset: -1rem 0 auto;
  height: 1rem;
  background: inherit;
}

#profile-view .welcome-placeholder,
#profile-view .empty-state {
  margin: 0;
  padding: var(--space-6);
  background: transparent;
  border: 0;
  border-radius: 0;
  box-shadow: none;
}

#profile-view .empty-state { flex: 1 1 auto; }

#profile-view .students-list-container {
  padding: 0 1.25rem calc(1.25rem + var(--profile-scroll-slack, 0px)) 1.25rem;
}

.glass-container.state-profile:not(.profile-expanded) #students-list {
  flex: 1 1 auto;
  min-height: 0;
  justify-content: center;
  padding-bottom: 0;
}

#profile-view #students-loader {
  flex: 1;
  min-height: 40vh;
  padding: 30px 1.25rem;
}

/* =========================================
   PHOTO UPLOAD — BUTTON & CONTROLS
   ========================================= */
.upload-photo-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 12px;
  padding: 8px 16px;
  border-radius: 10px;
  border: 1px solid var(--accent);
  background: transparent;
  color: var(--accent);
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  letter-spacing: 0.2px;
}

.upload-photo-btn re-icon {
  font-size: 1rem !important;
}

.upload-photo-btn:hover {
  background: var(--accent);
  color: var(--accent-foreground);
  box-shadow: 0 4px 12px var(--accent-glow);
  transform: translateY(-1px);
}

.upload-photo-btn:active {
  transform: translateY(0);
}

.upload-photo-btn:disabled {
  opacity: 1;
  cursor: not-allowed;
  transform: none;
}

/* =========================================
   PHOTO UPLOAD — FULL-SCREEN PREVIEW MODAL
   ========================================= */
.upload-preview-modal {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--overlay-sheet);
  z-index: 300;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  opacity: 0;
  transition: opacity var(--duration-slow) var(--ease-out);
}

.upload-preview-modal.open {
  display: flex;
}

.upload-preview-modal.is-visible { opacity: 1; }

.upload-preview-sheet {
  width: 100%;
  max-width: 480px;
  background: var(--popover);
  backdrop-filter: blur(40px);
  -webkit-backdrop-filter: blur(40px);
  border-top-left-radius: var(--radius-2xl);
  border-top-right-radius: var(--radius-2xl);
  border-top: 1px solid var(--border-glass);
  box-shadow: var(--shadow-lg);
  padding: 1.25rem 1.5rem 2rem;
  opacity: 0;
  transform: translateY(100%);
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
}

.upload-preview-modal.is-visible .upload-preview-sheet {
  opacity: 1;
  transform: translateY(0);
}

.upload-preview-handle {
  width: 40px;
  height: 4px;
  background: var(--border-glass);
  border-radius: 2px;
  margin: 0 auto 1.25rem auto;
}

.upload-preview-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}

.upload-preview-title {
  font-family: var(--font-serif);
  font-size: calc(1rem + 4px);
  font-style: italic;
  font-weight: 400;
  color: var(--text-primary);
}

.upload-preview-close {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-secondary);
  padding: 4px;
  border-radius: 50%;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
}

.upload-preview-close:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.upload-preview-body {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

/* Drop-zone / Image Preview Area */
.upload-dropzone {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 24px;
  border: 2px dashed var(--border-glass);
  border-radius: 16px;
  background: var(--bg-hover);
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
  min-height: 200px;
}

.upload-dropzone:hover,
.upload-dropzone.dragover {
  border-color: var(--accent);
  background: var(--accent-glow);
}

.upload-dropzone-icon {
  font-size: 2.5rem !important;
  color: var(--accent);
  opacity: 0.7;
}

.upload-dropzone-text {
  font-size: 0.85rem;
  color: var(--text-secondary);
  text-align: center;
}

.upload-dropzone-subtext {
  font-size: 0.75rem;
  color: var(--text-secondary);
  opacity: 0.7;
  text-align: center;
}

/* Preview image shown inside dropzone after selection */
.upload-preview-img {
  max-width: 100%;
  max-height: 220px;
  border-radius: 12px;
  object-fit: contain;
  box-shadow: var(--shadow-md);
  display: none;
}

.upload-student-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  text-align: center;
}

/* Progress bar */
.upload-progress-bar-wrap {
  width: 100%;
  height: 6px;
  background: var(--bg-hover);
  border-radius: 3px;
  overflow: hidden;
  display: none;
}

.upload-progress-bar-wrap.visible {
  display: block;
}

.upload-progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--primary), var(--chart-5));
  border-radius: 3px;
  transition: width 0.3s ease;
  animation: progressShimmer 1.5s infinite linear;
  background-size: 200% 100%;
}

@keyframes progressShimmer {
  0% { background-position: 200% center; }
  100% { background-position: -200% center; }
}

/* Action buttons row */
.upload-actions {
  display: flex;
  gap: 10px;
  width: 100%;
  margin-top: 4px;
}

.upload-cancel-btn {
  flex: 1;
  padding: 10px;
  border-radius: 10px;
  border: 1px solid var(--border-glass);
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color var(--duration-normal) var(--ease-standard),
              color var(--duration-normal) var(--ease-standard),
              opacity var(--duration-fast) var(--ease-out),
              transform var(--duration-fast) var(--ease-out);
}

.upload-cancel-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.upload-confirm-btn {
  flex: 2;
  padding: 10px;
  border-radius: 10px;
  border: none;
  background: var(--primary);
  color: var(--primary-foreground);
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 700;
  cursor: pointer;
  transition: background-color var(--duration-normal) var(--ease-standard),
              box-shadow var(--duration-normal) var(--ease-standard),
              opacity var(--duration-fast) var(--ease-out),
              transform var(--duration-fast) var(--ease-out);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  box-shadow: 0 4px 12px var(--accent-glow);
}

.upload-confirm-btn:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 6px 16px var(--accent-glow);
}

.upload-cancel-btn:active:not(:disabled),
.upload-confirm-btn:active:not(:disabled) {
  transform: scale(0.98);
}

.upload-confirm-btn:disabled {
  opacity: 1;
  cursor: not-allowed;
  transform: none;
}

.upload-confirm-btn .btn-spinner {
  width: 14px;
  height: 14px;
  color: var(--primary-foreground);
  display: none;
}

.upload-confirm-btn.uploading .btn-spinner {
  display: block;
}

.upload-confirm-btn.uploading .btn-label {
  display: none;
}

@media (max-width: 360px) {
  .app-shell-header .header-text h2 {
    white-space: normal;
  }

  .app-nav {
    gap: var(--space-2);
  }

  .nav-item {
    padding-inline: var(--space-2);
  }

  .nav-item:not(.logout-btn) span {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
  }

  .student-modal-body {
    align-items: flex-start;
  }

  .modal-student-photo {
    width: 88px;
    height: 88px;
  }

  .topic-info {
    font-size: 0.76rem;
  }

  #active-topic-name {
    overflow-wrap: anywhere;
  }
}


@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }

  .upload-preview-modal,
  .upload-preview-sheet,
  .student-photo-frame :is(.student-thumb, .student-photo-large),
  #login-btn,
  .confirm-btn,
  .upload-cancel-btn,
  .upload-confirm-btn {
    transition: opacity var(--duration-fast) var(--ease-out) !important;
  }

  .upload-preview-sheet,
  #login-btn:active:not(:disabled),
  .confirm-btn:active:not(:disabled),
  .upload-cancel-btn:active:not(:disabled),
  .upload-confirm-btn:active:not(:disabled) {
    transform: none !important;
  }

  #login-btn:active:not(:disabled),
  .confirm-btn:active:not(:disabled),
  .upload-cancel-btn:active:not(:disabled),
  .upload-confirm-btn:active:not(:disabled) {
    opacity: 0.92;
  }
}