/* ============================================
   SARC Notes v2.2 — Modern Monochrome LMS Design
   Pure neutral palette · Refined spacing · A11Y
   ============================================ */

:root {
  /* === Pure monochrome scale (modern app feel) === */
  --ink-1000: #000000;
  --ink-950:  #0a0a0a;
  --ink-900:  #111111;
  --ink-850:  #161616;
  --ink-800:  #1c1c1c;
  --ink-700:  #2a2a2a;
  --ink-600:  #3d3d3d;
  --ink-500:  #6b6b6b;
  --ink-400:  #8e8e8e;
  --ink-350:  #a8a8a8;
  --ink-300:  #c7c7c7;
  --ink-250:  #d6d6d6;
  --ink-200:  #e4e4e4;
  --ink-150:  #ededed;
  --ink-100:  #f4f4f4;
  --ink-75:   #f7f7f7;
  --ink-50:   #fafafa;
  --ink-0:    #ffffff;

  /* === Accent: deep ink primary (monochrome friendly) === */
  --primary: #0f0f0f;
  --primary-hover: #2a2a2a;
  --primary-soft: #f4f4f4;
  --primary-ring: rgba(15,15,15,.12);
  --accent: #0f0f0f;

  /* === Semantic tokens === */
  --bg:        var(--ink-50);
  --bg-elev:   #ffffff;
  --bg-subtle: var(--ink-75);
  --card:      #ffffff;
  --text:      var(--ink-800);
  --text-strong: var(--ink-900);
  --muted:     var(--ink-500);
  --muted-2:   var(--ink-400);
  --border:    var(--ink-200);
  --border-strong: var(--ink-300);
  --border-subtle: var(--ink-150);

  /* === Status (kept neutral but readable) === */
  --success: #166534;
  --success-fg: #166534;
  --danger:  #991b1b;
  --danger-fg: #991b1b;
  --warning: #92400e;
  --warning-fg: #92400e;
  --info:    var(--primary);

  --success-soft: #ecfdf5;
  --danger-soft:  #fef2f2;
  --warning-soft: #fffbeb;
  --info-soft:    var(--ink-100);

  /* === Geometry === */
  --radius:    10px;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 14px;
  --radius-xl: 18px;
  --radius-full: 999px;

  /* === Elevation (very subtle, modern) === */
  --shadow-xs: 0 1px 2px rgba(0,0,0,.04);
  --shadow:    0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.03);
  --shadow-md: 0 6px 16px -4px rgba(0,0,0,.08), 0 2px 4px rgba(0,0,0,.04);
  --shadow-lg: 0 18px 36px -10px rgba(0,0,0,.14), 0 4px 8px rgba(0,0,0,.06);
  --shadow-focus: 0 0 0 3px var(--primary-ring);

  /* === Motion === */
  --transition: all .18s cubic-bezier(.4,0,.2,1);
  --transition-fast: all .12s ease;
  --transition-slow: all .3s cubic-bezier(.4,0,.2,1);

  /* === Typography === */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* === Layout === */
  --sidebar-w: 248px;
  --topbar-h: 60px;
  --container-w: 1280px;
}

[data-theme="dark"] {
  --bg:        #0a0a0a;
  --bg-elev:   #121212;
  --bg-subtle: #161616;
  --card:      #131313;
  --text:      #e4e4e4;
  --text-strong: #fafafa;
  --muted:     #9a9a9a;
  --muted-2:   #6e6e6e;
  --border:    #262626;
  --border-strong: #333333;
  --border-subtle: #1f1f1f;

  --primary: #f4f4f4;
  --primary-hover: #ffffff;
  --primary-soft: #1f1f1f;
  --primary-ring: rgba(244,244,244,.18);
  --accent: #f4f4f4;

  --success-fg: #6ee7b7;
  --danger-fg: #fca5a5;
  --warning-fg: #fcd34d;

  --success-soft: rgba(16,185,129,.10);
  --danger-soft:  rgba(239,68,68,.10);
  --warning-soft: rgba(245,158,11,.10);
  --info-soft:    rgba(255,255,255,.04);

  --shadow:    0 1px 3px rgba(0,0,0,.4);
  --shadow-md: 0 6px 16px rgba(0,0,0,.5);
  --shadow-lg: 0 18px 36px rgba(0,0,0,.55);
}

/* ============================================
   RESET & BASE
   ============================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background .2s ease, color .2s ease;
  min-height: 100vh;
}
a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--primary-hover); }
img, video { max-width: 100%; height: auto; display: block; }
hr { border: 0; border-top: 1px solid var(--border); margin: 16px 0; }
::selection { background: var(--ink-900); color: #fff; }
[data-theme="dark"] ::selection { background: var(--ink-100); color: var(--ink-900); }
h1, h2, h3, h4, h5, h6 { color: var(--text-strong); font-weight: 700; letter-spacing: -.015em; line-height: 1.25; }

/* Focus visible polish */
:focus-visible { outline: none; box-shadow: var(--shadow-focus); border-radius: 4px; }

/* Loading bar (top of page) */
.loading-bar {
  position: fixed; top: 0; left: 0; height: 2px; width: 0;
  background: var(--primary); z-index: 9999;
  transition: width .25s ease, opacity .3s ease;
}
.loading-bar.active { width: 70%; }
.loading-bar.done { width: 100%; opacity: 0; }

/* ============================================
   BUTTONS — Modern, accessible, monochrome
   ============================================ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 9px 16px; border: 1px solid transparent; border-radius: var(--radius-sm);
  font-weight: 500; font-size: 13.5px; cursor: pointer;
  transition: var(--transition); text-decoration: none;
  font-family: inherit; line-height: 1.2;
  user-select: none; white-space: nowrap;
  position: relative; overflow: hidden;
}
.btn:focus-visible { outline: none; box-shadow: var(--shadow-focus); }
.btn-primary { background: var(--ink-900); color: var(--ink-0); border-color: var(--ink-900); }
.btn-primary:hover { background: var(--ink-800); border-color: var(--ink-800); color: var(--ink-0); transform: translateY(-1px); }
.btn-primary:active { transform: translateY(0); }
[data-theme="dark"] .btn-primary { background: var(--ink-100); color: var(--ink-900); border-color: var(--ink-100); }
[data-theme="dark"] .btn-primary:hover { background: var(--ink-0); border-color: var(--ink-0); color: var(--ink-900); }
.btn-outline { background: transparent; color: var(--text); border-color: var(--border-strong); }
.btn-outline:hover { border-color: var(--text-strong); color: var(--text-strong); background: var(--bg-subtle); }
.btn-dark { background: var(--ink-900); color: #fff; border-color: var(--ink-900); }
.btn-dark:hover { background: var(--ink-800); border-color: var(--ink-800); color: #fff; }
.btn-danger { background: var(--danger); color: #fff; border-color: var(--danger); }
.btn-danger:hover { filter: brightness(.9); color: #fff; }
.btn-success { background: var(--success); color: #fff; border-color: var(--success); }
.btn-success:hover { filter: brightness(.9); color: #fff; }
.btn-warning { background: var(--warning); color: #fff; border-color: var(--warning); }
.btn-warning:hover { filter: brightness(.9); color: #fff; }
.btn-ghost { background: transparent; color: var(--text); border-color: transparent; }
.btn-ghost:hover { background: var(--bg-subtle); color: var(--text-strong); }
.btn-soft { background: var(--bg-subtle); color: var(--text-strong); border-color: var(--border-subtle); }
.btn-soft:hover { background: var(--border-subtle); }
.btn-sm { padding: 6px 12px; font-size: 12.5px; gap: 6px; border-radius: var(--radius-sm); }
.btn-lg { padding: 12px 22px; font-size: 15px; border-radius: var(--radius-md); }
.btn-icon { padding: 8px; width: 36px; height: 36px; }
.btn-block { display: flex; width: 100%; }
.btn:disabled { opacity: .55; cursor: not-allowed; transform: none !important; }
.btn .fa-spin { animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ============================================
   FORMS — Refined inputs
   ============================================ */
.form-group { margin-bottom: 16px; }
.form-label { display: block; font-size: 13px; font-weight: 500; margin-bottom: 6px; color: var(--text-strong); }
.form-label .req { color: var(--danger); }
.form-control {
  width: 100%; padding: 10px 13px;
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  font-size: 14px; background: var(--bg-elev); color: var(--text);
  transition: var(--transition); font-family: inherit;
  -webkit-appearance: none; appearance: none;
}
.form-control:hover { border-color: var(--border-strong); }
.form-control:focus {
  outline: none; border-color: var(--text-strong);
  box-shadow: var(--shadow-focus);
}
.form-control::placeholder { color: var(--muted-2); }
.form-control[readonly], .form-control:disabled { background: var(--bg-subtle); cursor: not-allowed; }
select.form-control {
  cursor: pointer;
  background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%236b6b6b' stroke-width='2.5' stroke-linecap='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 12px center;
  padding-right: 34px;
}
[data-theme="dark"] select.form-control {
  background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%239a9a9a' stroke-width='2.5' stroke-linecap='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
}
textarea.form-control { resize: vertical; min-height: 90px; line-height: 1.55; }
input[type="file"].form-control { padding: 8px 10px; cursor: pointer; }
input[type="checkbox"], input[type="radio"] {
  width: 16px; height: 16px; accent-color: var(--ink-900); cursor: pointer;
}
[data-theme="dark"] input[type="checkbox"], [data-theme="dark"] input[type="radio"] { accent-color: var(--ink-100); }
.form-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 12px; }
.form-hint { font-size: 12px; color: var(--muted); margin-top: 5px; }
.form-error { font-size: 12px; color: var(--danger-fg); margin-top: 5px; }
.input-group { display: flex; gap: 0; }
.input-group .form-control { border-radius: 0; }
.input-group .form-control:first-child { border-radius: var(--radius-sm) 0 0 var(--radius-sm); }
.input-group .form-control:last-child { border-radius: 0 var(--radius-sm) var(--radius-sm) 0; }
.input-group .btn { border-radius: 0 var(--radius-sm) var(--radius-sm) 0; }

/* Toggle switch */
.switch { position: relative; display: inline-block; width: 38px; height: 22px; }
.switch input { opacity: 0; width: 0; height: 0; }
.switch-slider {
  position: absolute; cursor: pointer; inset: 0; background: var(--border-strong);
  transition: var(--transition); border-radius: 999px;
}
.switch-slider::before {
  content: ''; position: absolute; width: 16px; height: 16px; left: 3px; top: 3px;
  background: #fff; transition: var(--transition); border-radius: 50%;
  box-shadow: 0 1px 3px rgba(0,0,0,.2);
}
.switch input:checked + .switch-slider { background: var(--ink-900); }
[data-theme="dark"] .switch input:checked + .switch-slider { background: var(--ink-100); }
[data-theme="dark"] .switch input:checked + .switch-slider::before { background: var(--ink-900); }
.switch input:checked + .switch-slider::before { transform: translateX(16px); }

/* ============================================
   CARDS
   ============================================ */
.card {
  background: var(--card); border-radius: var(--radius);
  padding: 20px; box-shadow: var(--shadow-xs);
  border: 1px solid var(--border-subtle);
  transition: var(--transition);
}
.card:hover { border-color: var(--border); }
.card-title { font-size: 14px; font-weight: 600; margin-bottom: 14px; display:flex; align-items:center; gap:8px; color: var(--text-strong); }
.card-title i { color: var(--muted); font-size: 13px; }
.card-compact { padding: 14px; }
.card-flat { box-shadow: none; }
.card-section { padding: 16px 20px; border-bottom: 1px solid var(--border-subtle); }
.card-section:last-child { border-bottom: 0; }
.card-bordered { border: 1px solid var(--border); }
.card-header { display:flex; justify-content:space-between; align-items:center; margin-bottom: 14px; gap: 8px; flex-wrap: wrap; }

/* ============================================
   ALERTS
   ============================================ */
.alert {
  padding: 12px 14px; border-radius: var(--radius-sm);
  margin-bottom: 16px; font-size: 13.5px;
  border: 1px solid var(--border);
  background: var(--bg-elev);
  display: flex; gap: 10px; align-items: flex-start;
}
.alert i:first-child { margin-top: 2px; font-size: 14px; flex-shrink: 0; }
.alert-success { background: var(--success-soft); color: var(--success-fg); border-color: rgba(16,185,129,.2); }
.alert-danger  { background: var(--danger-soft);  color: var(--danger-fg);  border-color: rgba(239,68,68,.22); }
.alert-info    { background: var(--info-soft); color: var(--text); border-color: var(--border); }
.alert-warning { background: var(--warning-soft); color: var(--warning-fg); border-color: rgba(245,158,11,.22); }
.alert-dismiss { margin-left: auto; background: none; border: 0; cursor: pointer; color: inherit; opacity: .6; }
.alert-dismiss:hover { opacity: 1; }

/* ============================================
   CONTAINER & LAYOUT
   ============================================ */
.container { max-width: var(--container-w); margin: 0 auto; padding: 0 24px; }
.flex { display: flex; }
.flex-col { display: flex; flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: 4px; } .gap-2 { gap: 8px; } .gap-3 { gap: 12px; } .gap-4 { gap: 16px; } .gap-5 { gap: 20px; } .gap-6 { gap: 24px; }
.mt-1 { margin-top: 4px; } .mt-2 { margin-top: 8px; } .mt-3 { margin-top: 12px; } .mt-4 { margin-top: 16px; } .mt-5 { margin-top: 20px; } .mt-6 { margin-top: 24px; }
.mb-1 { margin-bottom: 4px; } .mb-2 { margin-bottom: 8px; } .mb-3 { margin-bottom: 12px; } .mb-4 { margin-bottom: 16px; } .mb-5 { margin-bottom: 20px; } .mb-6 { margin-bottom: 24px; }
.w-full { width: 100%; }
.text-muted { color: var(--muted); }
.text-sm { font-size: 12.5px; }
.text-xs { font-size: 11.5px; }
.text-center { text-align: center; }
.font-mono { font-family: var(--font-mono); }
.truncate { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* ============================================
   STATUS PAGES
   ============================================ */
.status-page {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  padding: 30px; background: var(--bg);
}
.status-card {
  max-width: 480px; width: 100%; background: var(--card);
  padding: 40px 36px; border-radius: var(--radius-lg);
  border: 1px solid var(--border); text-align: center;
  box-shadow: var(--shadow-md);
}
.status-icon {
  width: 64px; height: 64px; border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 26px; margin-bottom: 20px; background: var(--bg-subtle); color: var(--text-strong);
}
.status-icon-danger  { background: var(--danger-soft);  color: var(--danger-fg); }
.status-icon-warning { background: var(--warning-soft); color: var(--warning-fg); }
.status-icon-info    { background: var(--info-soft); color: var(--text-strong); }
.status-card h2 { font-size: 22px; margin-bottom: 10px; }
.status-card p  { color: var(--muted); font-size: 14px; margin-bottom: 22px; line-height: 1.6; }
.status-actions { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }

/* ============================================
   LANDING / PUBLIC NAV
   ============================================ */
.navbar {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.85); backdrop-filter: saturate(1.2) blur(14px);
  -webkit-backdrop-filter: saturate(1.2) blur(14px);
  border-bottom: 1px solid var(--border-subtle);
}
[data-theme="dark"] .navbar { background: rgba(10,10,10,.85); }
.nav-wrap { display: flex; align-items: center; justify-content: space-between; padding: 14px 24px; max-width: var(--container-w); margin: 0 auto; gap: 16px; }
.logo { font-size: 16px; font-weight: 700; color: var(--text-strong); display: flex; align-items: center; gap: 10px; letter-spacing: -.02em; }
.logo:hover { color: var(--text-strong); }
.logo-icon {
  width: 30px; height: 30px; background: var(--ink-900); color: #fff;
  border-radius: 7px; display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 14px; letter-spacing: 0;
}
[data-theme="dark"] .logo-icon { background: var(--ink-100); color: var(--ink-900); }
.logo-icon img { width: 100%; height: 100%; object-fit: cover; border-radius: 7px; }
.nav-menu { display: flex; gap: 28px; align-items: center; list-style: none; }
.nav-menu a { color: var(--muted); font-size: 14px; font-weight: 500; }
.nav-menu a:hover { color: var(--text-strong); }
.nav-actions { display: flex; gap: 8px; align-items: center; }
.menu-toggle { display: none; background: none; border: 0; cursor: pointer; font-size: 20px; color: var(--text); padding: 6px; }

.hero { padding: 90px 0 60px; text-align: center; position: relative; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 6px; padding: 5px 12px;
  background: var(--bg-subtle); color: var(--text-strong);
  border-radius: 999px; font-size: 12px; font-weight: 500;
  margin-bottom: 22px; border: 1px solid var(--border-subtle);
}
.hero h1 { font-size: 56px; font-weight: 800; line-height: 1.04; margin-bottom: 18px; letter-spacing: -.035em; color: var(--text-strong); }
.hero h1 span { color: var(--muted); }
.hero p  { font-size: 17px; color: var(--muted); max-width: 600px; margin: 0 auto 28px; line-height: 1.6; }
.hero-cta { display: flex; gap: 10px; justify-content: center; margin-bottom: 48px; flex-wrap: wrap; }
.hero-mockup { max-width: 900px; margin: 0 auto; border-radius: var(--radius-lg); box-shadow: var(--shadow-lg); border: 1px solid var(--border); overflow: hidden; background: var(--card); }
.hero-mockup-inner {
  background: linear-gradient(135deg, var(--ink-900), var(--ink-700));
  height: 320px; display: flex; align-items: center; justify-content: center;
  color: #fff; flex-direction: column; gap: 14px;
}
.hero-mockup-inner i { font-size: 56px; opacity: .85; }
.hero-mockup-inner h3 { color: #fff; font-size: 20px; }
.hero-mockup-inner p { color: rgba(255,255,255,.75); font-size: 14px; max-width: none; margin: 0; }

.section { padding: 80px 0; }
.section-head { text-align: center; margin-bottom: 48px; }
.section-head h2 { font-size: 36px; font-weight: 800; margin-bottom: 10px; letter-spacing: -.025em; }
.section-head p  { color: var(--muted); font-size: 15px; }

.features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.feature-card { background: var(--card); padding: 24px; border-radius: var(--radius); border: 1px solid var(--border-subtle); transition: var(--transition); }
.feature-card:hover { transform: translateY(-2px); border-color: var(--border-strong); box-shadow: var(--shadow); }
.feature-icon { width: 40px; height: 40px; background: var(--bg-subtle); color: var(--text-strong); border-radius: 9px; display: flex; align-items: center; justify-content: center; font-size: 17px; margin-bottom: 14px; border: 1px solid var(--border-subtle); }
.feature-card h3 { font-size: 16px; font-weight: 600; margin-bottom: 6px; }
.feature-card p  { color: var(--muted); font-size: 13.5px; line-height: 1.6; }

.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 20px; }
.step-card { text-align: center; padding: 24px; background: var(--card); border-radius: var(--radius); border: 1px solid var(--border-subtle); }
.step-num {
  width: 42px; height: 42px; background: var(--ink-900); color: #fff;
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  font-size: 16px; font-weight: 700; margin: 0 auto 14px;
}
[data-theme="dark"] .step-num { background: var(--ink-100); color: var(--ink-900); }
.step-card h4 { font-size: 16px; margin-bottom: 6px; }
.step-card p  { color: var(--muted); font-size: 13.5px; }

.testimonials-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; }
.testimonial { background: var(--card); padding: 24px; border-radius: var(--radius); border: 1px solid var(--border-subtle); }
.testimonial-text { font-size: 14px; margin-bottom: 14px; color: var(--text); line-height: 1.65; }
.testimonial-author { display: flex; align-items: center; gap: 10px; }
.avatar {
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--ink-900); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-weight: 600; font-size: 13px; flex-shrink: 0;
  overflow: hidden;
}
.avatar img { width: 100%; height: 100%; object-fit: cover; }
[data-theme="dark"] .avatar { background: var(--ink-100); color: var(--ink-900); }
.avatar-sm { width: 28px; height: 28px; font-size: 11px; }
.avatar-lg { width: 48px; height: 48px; font-size: 16px; }
.testimonial-author strong { display: block; font-size: 13px; color: var(--text-strong); }
.testimonial-author span { font-size: 12px; color: var(--muted); }

.faq-item { background: var(--card); border: 1px solid var(--border-subtle); border-radius: var(--radius-sm); margin-bottom: 10px; overflow: hidden; }
.faq-q { padding: 16px 20px; font-weight: 500; cursor: pointer; display: flex; justify-content: space-between; align-items: center; font-size: 14px; color: var(--text-strong); }
.faq-a { padding: 0 20px; max-height: 0; overflow: hidden; transition: all .25s; color: var(--muted); font-size: 14px; line-height: 1.6; }
.faq-item.active .faq-a { padding: 0 20px 16px; max-height: 320px; }
.faq-item.active .faq-q::after { transform: rotate(180deg); }
.faq-q::after { content: '⌄'; transition: transform .25s; font-size: 16px; color: var(--muted); }

.footer { background: var(--ink-950); color: var(--ink-300); padding: 56px 0 22px; }
[data-theme="dark"] .footer { background: #050505; border-top: 1px solid var(--border); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 32px; margin-bottom: 28px; }
.footer h5 { color: #fff; margin-bottom: 14px; font-size: 11px; text-transform: uppercase; letter-spacing: .8px; font-weight: 600; }
.footer ul { list-style: none; }
.footer ul li { margin-bottom: 8px; }
.footer ul a { color: var(--ink-350); font-size: 13.5px; }
.footer ul a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid var(--ink-700); padding-top: 20px; text-align: center; font-size: 12px; color: var(--ink-400); }

/* ============================================
   AUTH PAGES
   ============================================ */
.auth-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 24px 16px; background: var(--bg); position: relative; }
.auth-wrap::before {
  content: ''; position: absolute; inset: 0;
  background-image: radial-gradient(circle at 25% 25%, var(--bg-subtle) 0%, transparent 50%),
                    radial-gradient(circle at 75% 75%, var(--bg-subtle) 0%, transparent 50%);
  opacity: .6; pointer-events: none;
}
.auth-card { width: 100%; max-width: 440px; background: var(--card); padding: 36px; border-radius: var(--radius-lg); box-shadow: var(--shadow-md); border: 1px solid var(--border-subtle); position: relative; z-index: 1; }
.auth-card .logo { justify-content: center; margin-bottom: 24px; }
.auth-card h2 { font-size: 24px; font-weight: 800; margin-bottom: 6px; text-align: center; letter-spacing: -.02em; }
.auth-card .auth-sub { color: var(--muted); font-size: 14px; text-align: center; margin-bottom: 26px; }
.auth-footer { text-align: center; margin-top: 18px; font-size: 14px; color: var(--muted); }
.auth-footer a { font-weight: 500; color: var(--text-strong); text-decoration: underline; text-underline-offset: 3px; }

/* ============================================
   DASHBOARD LAYOUT — LMS shell
   ============================================ */
.app-shell { display: flex; min-height: 100vh; background: var(--bg); }

.sidebar {
  width: var(--sidebar-w); background: var(--bg-elev); border-right: 1px solid var(--border-subtle);
  position: fixed; left: 0; top: 0; bottom: 0; overflow-y: auto;
  transition: transform .25s ease; z-index: 50;
  display: flex; flex-direction: column;
}
.sidebar::-webkit-scrollbar { width: 6px; }
.sidebar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
.sidebar-header { padding: 16px 18px; border-bottom: 1px solid var(--border-subtle); flex-shrink: 0; }
.sidebar-nav { padding: 10px 10px 80px; flex: 1; }
.sidebar-section { font-size: 10.5px; font-weight: 600; color: var(--muted-2); text-transform: uppercase; letter-spacing: .8px; padding: 14px 10px 6px; }
.sidebar-link {
  display: flex; align-items: center; gap: 11px;
  padding: 8px 11px; border-radius: var(--radius-sm); color: var(--muted);
  font-size: 13.5px; font-weight: 500; margin-bottom: 1px; transition: var(--transition-fast);
  position: relative;
}
.sidebar-link:hover { background: var(--bg-subtle); color: var(--text-strong); }
.sidebar-link.active { background: var(--bg-subtle); color: var(--text-strong); font-weight: 600; }
.sidebar-link.active::before {
  content: ''; position: absolute; left: 0; top: 7px; bottom: 7px;
  width: 3px; background: var(--text-strong); border-radius: 0 3px 3px 0;
}
.sidebar-link i { width: 16px; font-size: 13px; text-align: center; flex-shrink: 0; }
.sidebar-link .sb-badge { margin-left: auto; background: var(--ink-900); color: #fff; font-size: 10px; padding: 2px 7px; border-radius: 999px; font-weight: 600; min-width: 18px; text-align: center; }
[data-theme="dark"] .sidebar-link .sb-badge { background: var(--ink-100); color: var(--ink-900); }
.sidebar-footer { padding: 12px; border-top: 1px solid var(--border-subtle); margin-top: auto; }

.main-area { flex: 1; margin-left: var(--sidebar-w); min-width: 0; min-height: 100vh; display: flex; flex-direction: column; }

.topbar {
  position: sticky; top: 0; z-index: 40;
  background: rgba(255,255,255,.85); backdrop-filter: saturate(1.2) blur(10px);
  -webkit-backdrop-filter: saturate(1.2) blur(10px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 10px 22px; display: flex; align-items: center; justify-content: space-between; gap: 12px;
  height: var(--topbar-h);
}
[data-theme="dark"] .topbar { background: rgba(18,18,18,.85); }
.topbar-left { display: flex; align-items: center; gap: 10px; flex: 1; max-width: 560px; }
.search-box { position: relative; flex: 1; max-width: 480px; }
.search-box input {
  width: 100%; padding: 9px 12px 9px 38px;
  border: 1px solid var(--border-subtle); border-radius: var(--radius-sm);
  background: var(--bg-subtle); font-size: 13.5px; color: var(--text);
  transition: var(--transition);
}
.search-box input:focus { outline: none; border-color: var(--border-strong); background: var(--bg-elev); box-shadow: var(--shadow-focus); }
.search-box input::placeholder { color: var(--muted-2); }
.search-box i { position: absolute; left: 14px; top: 50%; transform: translateY(-50%); color: var(--muted); font-size: 13px; pointer-events: none; }
.search-kbd { position: absolute; right: 8px; top: 50%; transform: translateY(-50%); font-size: 10px; padding: 2px 6px; background: var(--bg-elev); border: 1px solid var(--border); border-radius: 4px; color: var(--muted); font-family: var(--font-mono); pointer-events: none; }
.search-results {
  position: absolute; top: calc(100% + 6px); left: 0; right: 0;
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); margin-top: 4px; box-shadow: var(--shadow-lg);
  display: none; max-height: 420px; overflow-y: auto; z-index: 60;
}
.search-results.show { display: block; }
.search-result-item { display: block; padding: 10px 14px; border-bottom: 1px solid var(--border-subtle); cursor: pointer; color: var(--text); font-size: 13px; }
.search-result-item:hover { background: var(--bg-subtle); }
.search-result-item:last-child { border: 0; }
.search-result-item small { display: block; font-size: 11px; color: var(--muted); margin-top: 2px; }
.search-result-item strong { color: var(--text-strong); }
.search-empty { padding: 20px; text-align: center; color: var(--muted); font-size: 13px; }

.topbar-right { display: flex; align-items: center; gap: 8px; }
.icon-btn {
  width: 36px; height: 36px; border: 1px solid var(--border-subtle); background: var(--bg-elev);
  border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center;
  cursor: pointer; color: var(--muted); position: relative; transition: var(--transition-fast);
}
.icon-btn:hover { border-color: var(--border-strong); color: var(--text-strong); background: var(--bg-subtle); }
.icon-btn.active { background: var(--bg-subtle); color: var(--text-strong); border-color: var(--border); }
.notif-dot {
  position: absolute; top: 6px; right: 6px; width: 8px; height: 8px;
  background: var(--danger); border-radius: 50%;
  border: 2px solid var(--bg-elev);
}
.streak-pill {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 5px 10px; background: var(--warning-soft); color: var(--warning-fg);
  border-radius: 999px; font-size: 12px; font-weight: 600;
  border: 1px solid rgba(245,158,11,.2);
}

.dropdown { position: relative; }
/* v6: modernised dropdown menu — flat surface, subtle 1px outline, no glow.
   Removes the heavy --shadow-lg drop-shadow that produced the "ugly shadow/glow"
   reported on the online-user profile menu. Replaced with a crisp hairline
   border + a single light shadow ring that disappears on hover. */
.dropdown-menu {
  position: absolute; top: calc(100% + 6px); right: 0;
  min-width: 240px; background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius);
  /* Soft, single-layer shadow only — no glow, no double rings. */
  box-shadow: 0 4px 12px rgba(15, 23, 42, 0.06);
  padding: 6px; display: none; z-index: 60;
  animation: dropIn .15s ease;
}
@keyframes dropIn { from { opacity: 0; transform: translateY(-3px); } to { opacity: 1; transform: translateY(0); } }
.dropdown-menu.show { display: block; }
.dropdown-item {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 11px; border-radius: var(--radius-sm); color: var(--text);
  font-size: 13.5px; cursor: pointer; transition: var(--transition-fast);
  text-decoration: none;
}
.dropdown-item:hover { background: var(--bg-subtle); color: var(--text-strong); }
.dropdown-item i { width: 14px; font-size: 12.5px; color: var(--muted); }
.dropdown-divider { height: 1px; background: var(--border-subtle); margin: 4px 0; }

/* v6: cleaner profile button — no neon ring, no glow on focus. */
.profile-btn {
  display: flex; align-items: center; gap: 8px;
  padding: 4px 10px 4px 4px; border: 1px solid var(--border-subtle); border-radius: var(--radius-sm);
  background: var(--bg-elev); cursor: pointer; color: var(--text); transition: var(--transition-fast);
  box-shadow: none;
  outline: none;
}
.profile-btn:hover { border-color: var(--border-strong); background: var(--bg-subtle); }
.profile-btn:focus { outline: none; box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.18); }
.profile-btn:focus:not(:focus-visible) { box-shadow: none; }

/* v6: profile dropdown gets the same clean treatment as other dropdowns. */
#profileDD { border: 1px solid var(--border); box-shadow: 0 6px 20px rgba(15, 23, 42, 0.08); }
#profileDD .dropdown-item { padding: 10px 12px; }
[data-theme="dark"] #profileDD { box-shadow: 0 6px 20px rgba(0, 0, 0, 0.40); }

.content { padding: 24px; flex: 1; max-width: 100%; }
.page-header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 22px; flex-wrap: wrap; gap: 12px; }
.page-title { font-size: 24px; font-weight: 700; letter-spacing: -.02em; color: var(--text-strong); }
.page-sub   { color: var(--muted); font-size: 13px; margin-top: 4px; }
.page-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.breadcrumb { display: flex; gap: 6px; align-items: center; font-size: 12.5px; color: var(--muted); margin-bottom: 6px; }
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--text-strong); }
.breadcrumb-sep { color: var(--muted-2); }

/* === Stat Cards === */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 14px; margin-bottom: 24px; }
.stat-card {
  background: var(--card); padding: 18px; border-radius: var(--radius);
  border: 1px solid var(--border-subtle); transition: var(--transition);
  position: relative; overflow: hidden;
}
.stat-card:hover { border-color: var(--border-strong); transform: translateY(-1px); }
.stat-card .stat-icon {
  width: 36px; height: 36px; background: var(--bg-subtle); color: var(--text-strong);
  border-radius: 9px; display: flex; align-items: center; justify-content: center;
  margin-bottom: 12px; font-size: 15px; border: 1px solid var(--border-subtle);
}
.stat-card h4 { font-size: 11px; color: var(--muted); font-weight: 600; margin-bottom: 6px; text-transform: uppercase; letter-spacing: .6px; }
.stat-card .stat-num { font-size: 26px; font-weight: 700; color: var(--text-strong); letter-spacing: -.02em; }
.stat-card .stat-trend { font-size: 11.5px; color: var(--success-fg); margin-top: 4px; display: flex; align-items: center; gap: 4px; }
.stat-card .stat-trend.down { color: var(--danger-fg); }
.stat-card .stat-foot { font-size: 11.5px; color: var(--muted); margin-top: 6px; }

/* === Note Cards === */
.notes-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; }
.note-card {
  background: var(--card); border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--border-subtle); transition: var(--transition);
  display: flex; flex-direction: column;
}
.note-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); border-color: var(--border-strong); }
.note-cover {
  height: 110px;
  background: linear-gradient(135deg, var(--ink-800), var(--ink-600));
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: 28px; position: relative; overflow: hidden;
}
[data-theme="dark"] .note-cover { background: linear-gradient(135deg, #1a1a1a, #2a2a2a); }
.note-cover img { width: 100%; height: 100%; object-fit: cover; }
.note-cover-fallback { display: flex; align-items: center; justify-content: center; width: 100%; height: 100%; }
.note-pin {
  position: absolute; top: 8px; right: 8px;
  background: rgba(255,255,255,.18); color: #fff;
  padding: 3px 8px; border-radius: 4px; font-size: 10px; font-weight: 500;
  backdrop-filter: blur(6px); border: 1px solid rgba(255,255,255,.22);
}
.note-progress-overlay {
  position: absolute; bottom: 0; left: 0; right: 0;
  height: 3px; background: rgba(255,255,255,.25);
}
.note-progress-overlay > div { height: 100%; background: #fff; transition: width .3s ease; }
.note-body { padding: 14px 16px; flex: 1; }
.note-meta { display: flex; gap: 8px; font-size: 11px; color: var(--muted); margin-bottom: 6px; align-items: center; flex-wrap: wrap; }
.note-card h4 { font-size: 14.5px; margin-bottom: 6px; line-height: 1.35; font-weight: 600; }
.note-card h4 a { color: var(--text-strong); }
.note-card h4 a:hover { color: var(--primary); }
.note-excerpt { font-size: 12.5px; color: var(--muted); line-height: 1.5; margin-bottom: 6px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.note-footer {
  display: flex; justify-content: space-between; align-items: center;
  padding: 10px 16px; border-top: 1px solid var(--border-subtle);
  font-size: 11.5px; color: var(--muted);
}
.note-footer span { display: inline-flex; gap: 4px; align-items: center; }

/* === Tables === */
.table-wrap { background: var(--card); border-radius: var(--radius); border: 1px solid var(--border-subtle); overflow: hidden; overflow-x: auto; }
.table { width: 100%; border-collapse: collapse; }
.table th, .table td { padding: 12px 14px; text-align: left; font-size: 13.5px; vertical-align: middle; }
.table th { background: var(--bg-subtle); color: var(--muted); font-weight: 600; font-size: 11px; text-transform: uppercase; letter-spacing: .5px; border-bottom: 1px solid var(--border-subtle); }
.table tr { border-bottom: 1px solid var(--border-subtle); }
.table tr:last-child { border: 0; }
.table tbody tr:hover { background: var(--bg-subtle); }
.table td { color: var(--text); }
.table td strong { color: var(--text-strong); }
.table-actions { display: flex; gap: 4px; justify-content: flex-end; }

/* === Badges === */
.badge {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 3px 9px; border-radius: 999px; font-size: 11px; font-weight: 500;
  border: 1px solid transparent; white-space: nowrap;
}
.badge-primary { background: var(--bg-subtle); color: var(--text-strong); border-color: var(--border-subtle); }
.badge-success { background: var(--success-soft); color: var(--success-fg); border-color: rgba(16,185,129,.2); }
.badge-danger  { background: var(--danger-soft);  color: var(--danger-fg);  border-color: rgba(239,68,68,.2); }
.badge-warning { background: var(--warning-soft); color: var(--warning-fg); border-color: rgba(245,158,11,.2); }
.badge-muted   { background: var(--bg-subtle); color: var(--muted); border-color: var(--border-subtle); }
.badge-dark    { background: var(--ink-900); color: #fff; }
[data-theme="dark"] .badge-dark { background: var(--ink-100); color: var(--ink-900); }
.badge-dot::before { content: ''; width: 6px; height: 6px; background: currentColor; border-radius: 50%; }

/* === Note Reader === */
.note-reader { max-width: 820px; margin: 0 auto; background: var(--card); padding: 40px; border-radius: var(--radius-lg); border: 1px solid var(--border-subtle); box-shadow: var(--shadow-xs); }
.note-reader-cover { width: 100%; height: 220px; object-fit: cover; border-radius: var(--radius); margin-bottom: 22px; }
.note-reader h1 { font-size: 32px; line-height: 1.2; margin-bottom: 16px; letter-spacing: -.025em; }
.note-reader-meta { display: flex; gap: 14px; color: var(--muted); font-size: 12.5px; margin-bottom: 22px; padding-bottom: 20px; border-bottom: 1px solid var(--border-subtle); flex-wrap: wrap; align-items: center; }
.note-reader-meta span { display: inline-flex; gap: 5px; align-items: center; }
.note-actions { display: flex; gap: 8px; margin: 20px 0; flex-wrap: wrap; }

/* Reading progress sticky bar */
.reading-progress {
  position: sticky; top: var(--topbar-h); z-index: 30;
  background: var(--bg-elev); border: 1px solid var(--border-subtle);
  border-radius: var(--radius); padding: 12px 16px; margin-bottom: 20px;
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  box-shadow: var(--shadow-xs);
}
.reading-progress-info { display: flex; align-items: center; gap: 10px; flex: 1; min-width: 200px; }
.reading-progress-info i { color: var(--text-strong); }
.reading-progress-info strong { color: var(--text-strong); font-size: 13px; }
.reading-progress-info span { color: var(--muted); font-size: 12px; }
.reading-progress-bar {
  flex: 1; min-width: 120px; height: 6px;
  background: var(--bg-subtle); border-radius: 999px; overflow: hidden;
}
.reading-progress-bar-fill {
  height: 100%; background: var(--text-strong);
  transition: width .4s cubic-bezier(.4,0,.2,1);
  border-radius: 999px;
}
.reading-progress-stats { display: flex; gap: 12px; font-size: 12px; color: var(--muted); }
.reading-progress-stats strong { color: var(--text-strong); }
.reading-progress.completed { background: var(--success-soft); border-color: rgba(16,185,129,.25); }
.reading-progress.completed .reading-progress-bar-fill { background: var(--success); }

/* Note content — readable in both themes */
.note-content { font-size: 15.5px; line-height: 1.8; color: var(--text); }
.note-content h1, .note-content h2, .note-content h3, .note-content h4, .note-content h5 { color: var(--text-strong); }
.note-content h1 { margin: 28px 0 14px; font-size: 26px; letter-spacing: -.02em; }
.note-content h2 { margin: 26px 0 12px; font-size: 22px; }
.note-content h3 { margin: 20px 0 10px; font-size: 18px; }
.note-content h4 { margin: 18px 0 8px; font-size: 16px; }
.note-content p  { margin-bottom: 14px; color: var(--text); }
.note-content strong, .note-content b { color: var(--text-strong); font-weight: 600; }
.note-content em, .note-content i { color: var(--text); }
.note-content a { color: var(--text-strong); text-decoration: underline; text-underline-offset: 2px; }
.note-content a:hover { color: var(--primary-hover); }
.note-content img { border-radius: var(--radius-sm); margin: 14px 0; border: 1px solid var(--border-subtle); }
.note-content pre {
  background: var(--ink-900); color: var(--ink-100);
  padding: 14px 16px; border-radius: var(--radius-sm);
  overflow-x: auto; font-size: 13px; margin: 14px 0;
  font-family: var(--font-mono); line-height: 1.6;
}
[data-theme="dark"] .note-content pre { background: #050505; border: 1px solid var(--border); }
.note-content code {
  background: var(--bg-subtle); color: var(--text-strong);
  padding: 2px 6px; border-radius: 4px; font-size: .9em;
  font-family: var(--font-mono);
  border: 1px solid var(--border-subtle);
}
.note-content pre code { background: transparent; padding: 0; border: 0; color: inherit; }
.note-content ul, .note-content ol { margin: 10px 0 14px 22px; }
.note-content li { margin-bottom: 6px; color: var(--text); }
.note-content blockquote {
  border-left: 3px solid var(--text-strong);
  padding: 8px 16px; color: var(--muted); margin: 14px 0;
  background: var(--bg-subtle); border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.note-content table { width: 100%; border-collapse: collapse; margin: 14px 0; font-size: 14px; }
.note-content table th, .note-content table td { padding: 8px 12px; border: 1px solid var(--border); text-align: left; }
.note-content table th { background: var(--bg-subtle); color: var(--text-strong); font-weight: 600; }
.note-content hr { margin: 24px 0; border-top: 1px solid var(--border); }

/* === Comments — Modern threaded === */
.comment-list { margin-top: 22px; }
.comment {
  background: var(--card); border: 1px solid var(--border-subtle);
  border-radius: var(--radius); padding: 16px; margin-bottom: 12px;
  transition: var(--transition-fast);
}
.comment:hover { border-color: var(--border); }
.comment-header { display: flex; gap: 10px; align-items: center; margin-bottom: 8px; flex-wrap: wrap; }
.comment-header strong { font-size: 13px; color: var(--text-strong); }
.comment-time { font-size: 11.5px; color: var(--muted); }
.comment-body { font-size: 14px; line-height: 1.6; color: var(--text); margin-bottom: 8px; word-wrap: break-word; }
.comment-actions { display: flex; gap: 12px; align-items: center; font-size: 12px; }
.comment-action {
  background: none; border: 0; cursor: pointer; color: var(--muted);
  font-size: 12px; padding: 4px 6px; border-radius: 4px;
  display: inline-flex; gap: 4px; align-items: center;
  transition: var(--transition-fast);
}
.comment-action:hover { color: var(--text-strong); background: var(--bg-subtle); }
.comment-action.danger:hover { color: var(--danger-fg); }
.comment-replies { margin-top: 12px; padding-left: 20px; border-left: 2px solid var(--border-subtle); }
.comment-reply {
  background: var(--bg-subtle); border: 1px solid var(--border-subtle);
  margin-bottom: 8px; padding: 12px 14px;
}
.comment-reply .comment-body { font-size: 13.5px; }
.comment-reply-form { margin-top: 10px; padding: 12px; background: var(--bg-subtle); border-radius: var(--radius-sm); border: 1px solid var(--border-subtle); }
.comment-reply-form textarea { background: var(--bg-elev); margin-bottom: 8px; min-height: 60px; }
.comment-reply-form .btn-row { display: flex; gap: 6px; justify-content: flex-end; }
.comment-empty { text-align: center; padding: 30px 20px; color: var(--muted); font-size: 14px; background: var(--bg-subtle); border-radius: var(--radius); border: 1px dashed var(--border); }

/* Role tag inside comment */
.role-tag {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 2px 8px; border-radius: 4px; font-size: 10.5px; font-weight: 600;
  text-transform: uppercase; letter-spacing: .3px;
}
.role-tag.teacher { background: var(--info-soft); color: var(--text-strong); border: 1px solid var(--border); }
.role-tag.admin   { background: var(--ink-900); color: #fff; }
[data-theme="dark"] .role-tag.admin { background: var(--ink-100); color: var(--ink-900); }

/* === Modal === */
.modal { position: fixed; inset: 0; background: rgba(0,0,0,.55); display: none; align-items: center; justify-content: center; z-index: 200; padding: 16px; animation: fadeIn .2s ease; }
.modal.show { display: flex; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.modal-content { background: var(--card); border-radius: var(--radius-lg); width: 100%; max-width: 560px; max-height: 90vh; overflow-y: auto; box-shadow: var(--shadow-lg); border: 1px solid var(--border); animation: modalIn .25s cubic-bezier(.4,0,.2,1); }
@keyframes modalIn { from { transform: scale(.96); opacity: 0; } to { transform: scale(1); opacity: 1; } }
.modal-header { padding: 18px 22px; border-bottom: 1px solid var(--border-subtle); display: flex; justify-content: space-between; align-items: center; }
.modal-header h3 { font-size: 16px; font-weight: 600; }
.modal-close { background: none; border: 0; font-size: 22px; cursor: pointer; color: var(--muted); width: 32px; height: 32px; border-radius: 6px; display: flex; align-items: center; justify-content: center; }
.modal-close:hover { color: var(--text-strong); background: var(--bg-subtle); }
.modal-body { padding: 22px; }
.modal-footer { padding: 14px 22px; border-top: 1px solid var(--border-subtle); display: flex; gap: 8px; justify-content: flex-end; }
.modal-lg .modal-content { max-width: 780px; }
.modal-xl .modal-content { max-width: 1080px; }

/* === Toast === */
.toast-container { position: fixed; bottom: 20px; right: 20px; z-index: 1000; display: flex; flex-direction: column; gap: 10px; max-width: 360px; }
.toast {
  background: var(--card); border: 1px solid var(--border);
  border-left: 3px solid var(--text-strong);
  padding: 12px 16px; border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg); min-width: 240px; font-size: 13.5px;
  display: flex; gap: 10px; align-items: flex-start;
  animation: toastSlide .25s cubic-bezier(.4,0,.2,1);
  color: var(--text);
}
.toast i:first-child { margin-top: 2px; font-size: 14px; }
.toast.success { border-left-color: var(--success); }
.toast.success i:first-child { color: var(--success); }
.toast.error   { border-left-color: var(--danger);  }
.toast.error i:first-child { color: var(--danger); }
.toast.warning { border-left-color: var(--warning); }
.toast.warning i:first-child { color: var(--warning); }
.toast strong { display: block; color: var(--text-strong); font-size: 13.5px; }
.toast small { display: block; color: var(--muted); font-size: 12px; margin-top: 2px; }
.toast-close { background: none; border: 0; color: var(--muted); cursor: pointer; font-size: 14px; margin-left: auto; padding: 2px 6px; }
@keyframes toastSlide { from { transform: translateX(110%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }
.toast.removing { animation: toastOut .25s cubic-bezier(.4,0,.2,1) forwards; }
@keyframes toastOut { to { transform: translateX(110%); opacity: 0; } }

/* === Empty State === */
.empty-state { text-align: center; padding: 56px 20px; background: var(--card); border-radius: var(--radius); border: 1px dashed var(--border); }
.empty-state .empty-icon { width: 64px; height: 64px; border-radius: 50%; background: var(--bg-subtle); display: inline-flex; align-items: center; justify-content: center; margin-bottom: 14px; color: var(--muted); }
.empty-state i { font-size: 26px; }
.empty-state h4 { font-size: 16px; margin-bottom: 5px; color: var(--text-strong); }
.empty-state p  { color: var(--muted); font-size: 13.5px; max-width: 420px; margin: 0 auto 14px; line-height: 1.6; }

/* === Skeleton === */
.skeleton { background: linear-gradient(90deg, var(--bg-subtle) 25%, var(--border-subtle) 50%, var(--bg-subtle) 75%); background-size: 200% 100%; animation: shimmer 1.4s infinite; border-radius: 4px; }
@keyframes shimmer { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }
.skeleton-text { height: 12px; margin-bottom: 6px; }
.skeleton-text.lg { height: 18px; }
.skeleton-card { height: 200px; border-radius: var(--radius); }

/* === Spinner === */
.spinner {
  display: inline-block; width: 16px; height: 16px;
  border: 2px solid var(--border); border-top-color: var(--text-strong);
  border-radius: 50%; animation: spin .8s linear infinite;
}
.spinner.lg { width: 28px; height: 28px; border-width: 3px; }
.loader-overlay {
  position: fixed; inset: 0; background: rgba(255,255,255,.7); z-index: 9998;
  display: flex; align-items: center; justify-content: center;
  backdrop-filter: blur(2px);
}
[data-theme="dark"] .loader-overlay { background: rgba(0,0,0,.7); }

/* === Tooltip === */
[data-tooltip] { position: relative; }
[data-tooltip]:hover::after {
  content: attr(data-tooltip);
  position: absolute; bottom: calc(100% + 6px); left: 50%; transform: translateX(-50%);
  background: var(--ink-900); color: #fff; padding: 5px 9px; border-radius: 5px;
  font-size: 11px; white-space: nowrap; z-index: 100; pointer-events: none;
  box-shadow: var(--shadow-md);
}
[data-theme="dark"] [data-tooltip]:hover::after { background: var(--ink-100); color: var(--ink-900); }

/* === Pagination === */
.pagination { display: flex; gap: 4px; justify-content: center; margin-top: 22px; flex-wrap: wrap; }
.page-link { padding: 7px 12px; background: var(--bg-elev); border: 1px solid var(--border-subtle); border-radius: 6px; color: var(--text); font-size: 13px; transition: var(--transition-fast); }
.page-link:hover { border-color: var(--border-strong); color: var(--text-strong); background: var(--bg-subtle); }
.page-link.active { background: var(--ink-900); color: #fff; border-color: var(--ink-900); }
[data-theme="dark"] .page-link.active { background: var(--ink-100); color: var(--ink-900); border-color: var(--ink-100); }
.page-link.disabled { opacity: .5; pointer-events: none; }

/* === Notification rows === */
.notif-row { display: flex; gap: 12px; padding: 14px 18px; border-bottom: 1px solid var(--border-subtle); color: var(--text); transition: var(--transition-fast); align-items: flex-start; }
.notif-row:last-child { border: 0; }
.notif-row:hover { background: var(--bg-subtle); }
.notif-row.unread { background: var(--bg-subtle); position: relative; }
.notif-row.unread::before { content: ''; position: absolute; left: 6px; top: 22px; width: 6px; height: 6px; background: var(--text-strong); border-radius: 50%; }
.notif-icon { width: 36px; height: 36px; background: var(--bg-subtle); color: var(--text-strong); border-radius: 50%; display: flex; align-items: center; justify-content: center; flex-shrink: 0; border: 1px solid var(--border-subtle); }
.notif-content { flex: 1; }
.notif-content strong { display: block; color: var(--text-strong); font-size: 13.5px; margin-bottom: 2px; }
.notif-content p { color: var(--muted); font-size: 12.5px; margin-bottom: 3px; }
.notif-content small { color: var(--muted-2); font-size: 11px; }

/* === XP / Progress Bar === */
.progress-bar, .xp-bar { height: 6px; background: var(--bg-subtle); border-radius: 999px; overflow: hidden; margin-top: 8px; border: 1px solid var(--border-subtle); }
.progress-bar-fill, .xp-bar-fill { height: 100%; background: var(--text-strong); transition: width .4s cubic-bezier(.4,0,.2,1); border-radius: 999px; }
.progress-bar.lg, .xp-bar.lg { height: 10px; }
.progress-bar.success .progress-bar-fill { background: var(--success); }

/* Circular progress (note cards / reader stats) */
.circle-progress { width: 48px; height: 48px; position: relative; }
.circle-progress svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.circle-progress .bg { stroke: var(--bg-subtle); fill: none; stroke-width: 4; }
.circle-progress .fg { stroke: var(--text-strong); fill: none; stroke-width: 4; stroke-linecap: round; transition: stroke-dashoffset .5s ease; }
.circle-progress .val { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; font-size: 11px; font-weight: 600; color: var(--text-strong); }

/* === Badge tiles === */
.badge-tile { background: var(--card); border: 1px solid var(--border-subtle); border-radius: var(--radius); padding: 18px; text-align: center; transition: var(--transition); }
.badge-tile:hover { border-color: var(--border-strong); transform: translateY(-1px); }
.badge-tile .b-icon { width: 50px; height: 50px; border-radius: 50%; display: inline-flex; align-items: center; justify-content: center; font-size: 20px; margin-bottom: 10px; background: var(--bg-subtle); color: var(--text-strong); border: 1px solid var(--border-subtle); }
.badge-tile.locked { opacity: .55; }
.badge-tile h5 { font-size: 13px; margin-bottom: 3px; }
.badge-tile p  { font-size: 11px; color: var(--muted); }

/* === Flashcard === */
.flashcard { perspective: 1000px; height: 220px; cursor: pointer; }
.flashcard-inner { position: relative; width: 100%; height: 100%; text-align: center; transition: transform .5s; transform-style: preserve-3d; }
.flashcard.flipped .flashcard-inner { transform: rotateY(180deg); }
.flashcard-front, .flashcard-back { position: absolute; width: 100%; height: 100%; backface-visibility: hidden; padding: 22px; display: flex; flex-direction: column; justify-content: center; background: var(--card); border: 1px solid var(--border-subtle); border-radius: var(--radius); }
.flashcard-back { transform: rotateY(180deg); background: var(--bg-subtle); }

/* === Voice recorder === */
.voice-recorder { display: inline-flex; gap: 10px; align-items: center; padding: 8px 14px; background: var(--bg-subtle); border: 1px solid var(--border-subtle); border-radius: var(--radius-sm); font-size: 13px; }
.voice-btn { width: 32px; height: 32px; border-radius: 50%; background: var(--ink-900); color: #fff; border: 0; cursor: pointer; display: flex; align-items: center; justify-content: center; transition: var(--transition); }
[data-theme="dark"] .voice-btn { background: var(--ink-100); color: var(--ink-900); }
.voice-btn:hover { transform: scale(1.06); }
.voice-btn.recording { background: var(--danger); color: #fff; animation: pulse 1.2s infinite; }
@keyframes pulse { 0%,100% { box-shadow: 0 0 0 0 rgba(239,68,68,.45); } 50% { box-shadow: 0 0 0 8px rgba(239,68,68,0); } }
.voice-time { font-family: var(--font-mono); font-size: 12px; color: var(--muted); min-width: 40px; }

/* === File preview === */
.file-preview { background: var(--card); border: 1px solid var(--border-subtle); border-radius: var(--radius-sm); padding: 10px 12px; display: flex; gap: 10px; align-items: center; min-width: 200px; }
.file-preview .fp-icon { width: 36px; height: 36px; background: var(--bg-subtle); color: var(--text-strong); border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.file-preview .fp-info { display: flex; flex-direction: column; min-width: 0; }
.file-preview .fp-info strong { font-size: 13px; color: var(--text-strong); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 200px; }
.file-preview .fp-info small { font-size: 11px; color: var(--muted); }

/* === Tabs === */
.tab-strip { display: flex; gap: 2px; border-bottom: 1px solid var(--border-subtle); margin-bottom: 18px; overflow-x: auto; }
.tab-item {
  padding: 10px 14px; cursor: pointer; font-size: 13.5px; font-weight: 500;
  color: var(--muted); border-bottom: 2px solid transparent;
  white-space: nowrap; transition: var(--transition-fast);
}
.tab-item:hover { color: var(--text-strong); }
.tab-item.active { color: var(--text-strong); border-bottom-color: var(--text-strong); }
.tab-content { display: none; }
.tab-content.active { display: block; animation: fadeIn .2s ease; }

/* === Chips (filters) === */
.chip-group { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 16px; }
.chip { padding: 5px 12px; border-radius: 999px; background: var(--bg-elev); border: 1px solid var(--border-subtle); font-size: 12.5px; color: var(--muted); cursor: pointer; transition: var(--transition-fast); }
.chip:hover { border-color: var(--border-strong); color: var(--text-strong); }
.chip.active { background: var(--ink-900); color: #fff; border-color: var(--ink-900); }
[data-theme="dark"] .chip.active { background: var(--ink-100); color: var(--ink-900); border-color: var(--ink-100); }

/* === Assignments === */
.assignment-row { background: var(--card); border: 1px solid var(--border-subtle); border-radius: var(--radius); padding: 14px 16px; margin-bottom: 10px; display: flex; gap: 12px; align-items: center; flex-wrap: wrap; justify-content: space-between; transition: var(--transition-fast); }
.assignment-row:hover { border-color: var(--border-strong); }
.assignment-row .a-meta { display: flex; gap: 10px; flex-wrap: wrap; font-size: 12px; color: var(--muted); margin-top: 5px; }
.deadline { font-size: 12px; padding: 4px 10px; border-radius: 6px; font-weight: 500; display: inline-flex; gap: 4px; align-items: center; }
.deadline.urgent   { background: var(--danger-soft);  color: var(--danger-fg); }
.deadline.upcoming { background: var(--warning-soft); color: var(--warning-fg); }
.deadline.normal   { background: var(--bg-subtle); color: var(--muted); }

/* === PDF viewer wrapper === */
.pdf-viewer { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px; }
.pdf-viewer canvas, .pdf-viewer iframe { width: 100%; max-height: 75vh; border-radius: var(--radius-sm); }

/* === Form grid === */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }

/* === Bottom Nav (Mobile) === */
.bottom-nav { display: none; }

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero h1 { font-size: 40px; }
  .grid-2 { grid-template-columns: 1fr; }
  .grid-3 { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .nav-menu { display: none; position: absolute; top: 100%; left: 0; right: 0; background: var(--card); flex-direction: column; padding: 16px; border-bottom: 1px solid var(--border); }
  .nav-menu.show { display: flex; }
  .menu-toggle { display: block; }
  .hero { padding: 56px 0 30px; }
  .hero h1 { font-size: 34px; }
  .hero p  { font-size: 15px; }
  .section { padding: 56px 0; }
  .section-head h2 { font-size: 28px; }
  .footer-grid { grid-template-columns: 1fr; }

  .sidebar { transform: translateX(-100%); width: 280px; }
  .sidebar.show { transform: translateX(0); box-shadow: 8px 0 32px rgba(0,0,0,.25); }
  .main-area { margin-left: 0; padding-bottom: 70px; }
  .content { padding: 16px; }
  .note-reader { padding: 22px; border-radius: var(--radius); }
  .note-reader h1 { font-size: 24px; }
  .topbar { padding: 10px 14px; }
  .search-box { max-width: none; }
  .search-kbd { display: none; }
  .page-title { font-size: 20px; }
  .stat-card .stat-num { font-size: 22px; }
  .auth-card { padding: 28px 22px; }

  .bottom-nav {
    display: flex; position: fixed; bottom: 0; left: 0; right: 0;
    background: var(--card); border-top: 1px solid var(--border-subtle);
    padding: 6px 0; z-index: 50; justify-content: space-around;
    backdrop-filter: saturate(1.2) blur(10px);
  }
  .bottom-nav a {
    display: flex; flex-direction: column; align-items: center; gap: 3px;
    color: var(--muted); font-size: 10px; padding: 6px; min-width: 52px;
    transition: var(--transition-fast);
  }
  .bottom-nav a.active { color: var(--text-strong); }
  .bottom-nav a:hover { color: var(--text-strong); }
  .bottom-nav a i { font-size: 16px; }

  .grid-3 { grid-template-columns: 1fr; }
  .comment-replies { padding-left: 12px; }
}

@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .notes-grid { grid-template-columns: 1fr; }
  .auth-card  { padding: 22px 18px; }
  .modal-content { max-width: 95%; }
  .page-header { flex-direction: column; align-items: stretch; }
  .hero h1 { font-size: 28px; }
  .stat-card .stat-num { font-size: 20px; }
}

/* === Print === */
@media print {
  .sidebar, .topbar, .bottom-nav, .note-actions, .footer, .reading-progress, .icon-btn, .btn { display: none !important; }
  .main-area { margin-left: 0 !important; }
  .note-reader { box-shadow: none; border: 0; padding: 0; }
}

/* === Sidebar mobile backdrop === */
.sidebar-backdrop { display: none; position: fixed; inset: 0; background: rgba(0,0,0,.5); z-index: 49; }
.sidebar-backdrop.show { display: block; }

/* === Reduced motion === */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

/* === Misc helpers === */
.shadow-none { box-shadow: none !important; }
.border-0 { border: 0 !important; }
.text-strong { color: var(--text-strong) !important; }
.bg-subtle { background: var(--bg-subtle); }

/* =====================================================
   v2.3 additions — bug-fix & feature-pack styling
   ===================================================== */

/* Stat-card clickable */
.stat-card-link { text-decoration:none; color:inherit; display:block; transition:transform .15s ease, box-shadow .15s ease; }
.stat-card-link:hover { transform:translateY(-2px); box-shadow:0 6px 18px rgba(0,0,0,.08); cursor:pointer; }

/* Password toggle */
.password-wrap { position:relative; }
.password-wrap input { padding-right:38px; }
.password-toggle { padding:4px 8px; }
.password-toggle:hover { color:var(--text-strong); }

/* Online users strip (Messenger-style) */
.online-strip { position:relative; display:flex; align-items:center; gap:6px; padding:6px 0; }
.online-track {
  display:flex; gap:10px; overflow-x:auto; scroll-behavior:smooth;
  padding:6px 4px; flex:1; scrollbar-width:none;
}
.online-track::-webkit-scrollbar { display:none; }
.online-nav {
  width:32px; height:32px; border-radius:50%; border:1px solid var(--border);
  background:var(--bg); cursor:pointer; font-size:18px; line-height:1;
  display:flex; align-items:center; justify-content:center; flex:none;
}
.online-nav:hover { background:var(--bg-subtle); }
.online-pill {
  display:flex; flex-direction:column; align-items:center; gap:4px;
  flex:none; min-width:64px; cursor:pointer;
}
.online-avatar {
  position:relative; width:44px; height:44px; border-radius:50%;
  background:var(--bg); display:flex; align-items:center; justify-content:center;
  overflow:hidden; font-weight:600; color:var(--text-strong); border:2px solid #fff;
  box-shadow:0 0 0 1px var(--border);
}
.online-avatar img { width:100%; height:100%; object-fit:cover; }
.online-dot {
  position:absolute; right:0; bottom:0; width:12px; height:12px;
  background:#22c55e; border:2px solid #fff; border-radius:50%;
  animation: sarc-pulse 2s infinite;
}
.online-name {
  font-size:11px; color:var(--text); max-width:64px;
  overflow:hidden; text-overflow:ellipsis; white-space:nowrap;
}
@keyframes sarc-pulse {
  0%,100% { box-shadow:0 0 0 0 rgba(34,197,94,.6); }
  50%     { box-shadow:0 0 0 6px rgba(34,197,94,0); }
}

/* Upload progress */
.upload-progress {
  margin-top:10px; padding:8px 12px; background:var(--bg-subtle);
  border-radius:8px; display:flex; align-items:center; gap:10px; font-size:12px;
}
.upload-progress-bar { flex:1; height:8px; background:var(--border-subtle); border-radius:4px; overflow:hidden; }
.upload-progress-fill {
  height:100%; width:0; background:linear-gradient(90deg,#2563eb,#22d3ee);
  transition:width .25s ease; border-radius:4px;
}
.upload-progress-text { min-width:38px; text-align:right; color:var(--muted); font-variant-numeric:tabular-nums; }

/* Banner system */
.sarc-banner-stack { display:flex; flex-direction:column; }
.sarc-banner {
  padding:9px 22px; font-size:13.5px; text-align:center; overflow:hidden; position:relative;
}
.sarc-banner-inner { max-width:1100px; margin:0 auto; }
.sarc-banner-ticker .sarc-banner-inner {
  display:inline-block; padding-left:100%;
  white-space:nowrap; animation:sarc-ticker 22s linear infinite;
}
.sarc-banner-slide { animation:sarc-slide-in .6s ease both; }
.sarc-banner-fade  { animation:sarc-fade-in .8s ease both; }
.sarc-banner-bounce .sarc-banner-inner { display:inline-block; animation:sarc-bounce 1.4s infinite; }
@keyframes sarc-ticker { from { transform:translate3d(0,0,0); } to { transform:translate3d(-100%,0,0); } }
@keyframes sarc-slide-in { from { transform:translateY(-100%); } to { transform:translateY(0); } }
@keyframes sarc-fade-in { from { opacity:0; } to { opacity:1; } }
@keyframes sarc-bounce { 0%,100% { transform:translateY(0); } 50% { transform:translateY(-4px); } }

/* Notification unread pill */
.dropdown-item.unread::before {
  content:''; width:6px; height:6px; background:var(--primary,#2563eb);
  border-radius:50%; position:absolute; left:6px; top:18px;
}
.dropdown-item { position:relative; }

/* Collapsible blocks (announcements, activity, etc.) */
.collapsible { max-height:120px; overflow:hidden; position:relative; transition:max-height .35s ease; }
.collapsible.expanded { max-height:none; }
.collapsible:not(.expanded):after {
  content:''; position:absolute; left:0; right:0; bottom:0; height:42px;
  background:linear-gradient(180deg,transparent,var(--card,#fff));
  pointer-events:none;
}
.view-more {
  display:inline-block; margin-top:6px; font-size:12.5px; color:var(--primary,#2563eb);
  cursor:pointer; font-weight:500;
}
.view-more:hover { text-decoration:underline; }

/* Mobile-friendly tweaks */
@media (max-width:720px) {
  .page-header { flex-direction:column; align-items:stretch; gap:8px; }
  .page-actions { display:flex; flex-wrap:wrap; gap:6px; }
  .stats-grid { grid-template-columns:repeat(2,1fr) !important; }
  .grid-2 { grid-template-columns:1fr !important; }
  .table-wrap { overflow-x:auto; }
  .modal-content { max-width:calc(100vw - 24px); margin:12px; }
  .online-pill { min-width:56px; }
}

/* Reading-progress completed state */
.reading-progress.completed .reading-progress-bar-fill {
  background:linear-gradient(90deg,#22c55e,#16a34a);
}

/* =====================================================
   v6 additions — chat-redirect online pill + a11y
   ===================================================== */
a.online-pill {
  text-decoration: none;
  color: inherit;
  transition: transform .12s ease;
}
a.online-pill:hover { transform: translateY(-1px); }
a.online-pill:hover .online-name { color: var(--primary, #2563eb); }
a.online-pill:focus-visible { outline: 2px solid rgba(99,102,241,.45); outline-offset: 2px; border-radius: 8px; }

/* Online-users table — clickable rows */
.online-row:hover { background: var(--bg-subtle); }
.online-row td:first-child { position: relative; }