/* css/main.css — StudyGlass Liquid Glass Design */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Syne:wght@400;600;700;800&display=swap');

/* ─── Design Tokens ──────────────────────────────────────── */
:root {
  --glass-bg:          rgba(255, 255, 255, 0.12);
  --glass-bg-strong:   rgba(255, 255, 255, 0.22);
  --glass-border:      rgba(255, 255, 255, 0.30);
  --glass-border-soft: rgba(255, 255, 255, 0.14);
  --glass-shadow:      0 8px 32px rgba(0, 0, 0, 0.25);
  --glass-shadow-lg:   0 24px 64px rgba(0, 0, 0, 0.35);
  --blur:              blur(18px) saturate(180%);
  --blur-sm:           blur(10px) saturate(160%);

  --accent:        #7C6AF7;
  --accent-2:      #A78BFA;
  --accent-glow:   rgba(124, 106, 247, 0.45);
  --pink:          #F472B6;
  --cyan:          #22D3EE;
  --emerald:       #34D399;
  --amber:         #FBBF24;

  --text-primary:   rgba(255,255,255,0.95);
  --text-secondary: rgba(255,255,255,0.65);
  --text-muted:     rgba(255,255,255,0.40);

  --radius-sm:  10px;
  --radius-md:  16px;
  --radius-lg:  24px;
  --radius-xl:  32px;

  --font-display: 'Syne', sans-serif;
  --font-body:    'Inter', sans-serif;

  --sidebar-w: 260px;
  --topbar-h:  64px;
}

/* ─── Reset & Base ───────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  background: #0a0a1a;
}

/* ─── Gradient Background ────────────────────────────────── */
.bg-scene {
  position: fixed;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(ellipse 80% 60% at 20% 10%,  #1a0a3d 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 80% 80%,  #0d1f3c 0%, transparent 60%),
    radial-gradient(ellipse 50% 40% at 50% 50%,  #0f0f2e 0%, transparent 70%),
    #07070f;
}
.bg-orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.55;
  pointer-events: none;
  z-index: 0;
  animation: floatOrb 12s ease-in-out infinite alternate;
}
.bg-orb-1 { width: 500px; height: 500px; background: #4C1D95; top: -150px; left: -100px; animation-delay: 0s; }
.bg-orb-2 { width: 400px; height: 400px; background: #1E3A8A; bottom: -100px; right: -80px; animation-delay: -5s; }
.bg-orb-3 { width: 300px; height: 300px; background: #831843; top: 40%; left: 55%; animation-delay: -8s; }

@keyframes floatOrb {
  from { transform: translate(0, 0) scale(1); }
  to   { transform: translate(30px, 20px) scale(1.08); }
}

/* ─── Glass Card ─────────────────────────────────────────── */
.glass {
  background:  var(--glass-bg);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--glass-shadow), inset 0 1px 0 rgba(255,255,255,0.15);
}
.glass-sm {
  background:  var(--glass-bg);
  backdrop-filter: var(--blur-sm);
  -webkit-backdrop-filter: var(--blur-sm);
  border: 1px solid var(--glass-border-soft);
  border-radius: var(--radius-md);
  box-shadow: 0 4px 16px rgba(0,0,0,0.20), inset 0 1px 0 rgba(255,255,255,0.10);
}
.glass-strong {
  background: var(--glass-bg-strong);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--glass-shadow-lg), inset 0 1px 0 rgba(255,255,255,0.25);
}

/* ─── Auth Layout ────────────────────────────────────────── */
.auth-wrap {
  position: relative;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 24px;
}
.auth-card {
  width: 100%;
  max-width: 440px;
  padding: 48px 40px;
}
.auth-logo {
  text-align: center;
  margin-bottom: 32px;
}
.auth-logo .logo-icon {
  font-size: 48px;
  display: block;
  margin-bottom: 8px;
  filter: drop-shadow(0 0 20px var(--accent-glow));
}
.auth-logo h1 {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.5px;
}
.auth-logo p {
  color: var(--text-secondary);
  font-size: 14px;
  margin-top: 4px;
}
.auth-tabs {
  display: flex;
  gap: 4px;
  padding: 4px;
  margin-bottom: 28px;
}
.auth-tabs button {
  flex: 1;
  padding: 9px;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all .2s;
  background: transparent;
  color: var(--text-secondary);
}
.auth-tabs button.active {
  background: var(--glass-bg-strong);
  color: var(--text-primary);
  box-shadow: 0 2px 8px rgba(0,0,0,0.3), inset 0 1px 0 rgba(255,255,255,0.15);
}

/* ─── Form Elements ──────────────────────────────────────── */
.form-group { margin-bottom: 18px; }
.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 8px;
  letter-spacing: 0.02em;
}
.form-control {
  width: 100%;
  padding: 12px 16px;
  background: rgba(255,255,255,0.08);
  border: 1px solid var(--glass-border-soft);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 14px;
  outline: none;
  transition: all .2s;
}
.form-control:focus {
  background: rgba(255,255,255,0.13);
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(124,106,247,0.25);
}
.form-control::placeholder { color: var(--text-muted); }
textarea.form-control { resize: vertical; min-height: 120px; }

/* ─── Buttons ────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 22px;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all .2s;
  text-decoration: none;
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent), #9B6CF7);
  color: #fff;
  box-shadow: 0 4px 16px rgba(124,106,247,0.4), inset 0 1px 0 rgba(255,255,255,0.2);
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(124,106,247,0.55), inset 0 1px 0 rgba(255,255,255,0.2);
}
.btn-glass {
  background: var(--glass-bg);
  color: var(--text-primary);
  border: 1px solid var(--glass-border-soft);
  backdrop-filter: var(--blur-sm);
}
.btn-glass:hover {
  background: var(--glass-bg-strong);
  border-color: var(--glass-border);
}
.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid transparent;
}
.btn-ghost:hover { color: var(--text-primary); background: var(--glass-bg); }
.btn-danger {
  background: rgba(239,68,68,0.2);
  color: #FCA5A5;
  border: 1px solid rgba(239,68,68,0.3);
}
.btn-danger:hover { background: rgba(239,68,68,0.35); }
.btn-sm { padding: 7px 14px; font-size: 13px; }
.btn-full { width: 100%; }
.btn-icon { padding: 8px; border-radius: var(--radius-sm); min-width: 36px; }

/* ─── App Layout ─────────────────────────────────────────── */
.app-layout {
  position: relative;
  z-index: 10;
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  width: var(--sidebar-w);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; left: 0;
  z-index: 100;
  background: rgba(10,10,26,0.6);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border-right: 1px solid var(--glass-border-soft);
  transition: transform .3s ease;
}
.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 20px 20px 16px;
  border-bottom: 1px solid var(--glass-border-soft);
}
.sidebar-logo .logo-mark {
  font-size: 28px;
  filter: drop-shadow(0 0 12px var(--accent-glow));
}
.sidebar-logo .logo-text {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.3px;
}
.sidebar-nav {
  flex: 1;
  padding: 16px 12px;
  overflow-y: auto;
}
.nav-label {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  padding: 12px 8px 6px;
}
.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all .2s;
  text-decoration: none;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
}
.nav-item:hover {
  background: var(--glass-bg);
  color: var(--text-primary);
}
.nav-item.active {
  background: rgba(124,106,247,0.18);
  color: var(--accent-2);
  border: 1px solid rgba(124,106,247,0.25);
}
.nav-item .nav-icon { font-size: 16px; width: 20px; text-align: center; }
.nav-item .nav-badge {
  margin-left: auto;
  font-size: 11px;
  padding: 2px 7px;
  border-radius: 20px;
  background: rgba(124,106,247,0.25);
  color: var(--accent-2);
}
.sidebar-classes { padding: 0 12px 12px; }
.class-nav-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all .18s;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
}
.class-nav-item:hover { background: var(--glass-bg); color: var(--text-primary); }
.class-nav-item.active { background: var(--glass-bg); color: var(--text-primary); }
.class-dot { width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }

.sidebar-footer {
  padding: 12px;
  border-top: 1px solid var(--glass-border-soft);
}
.user-chip {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all .2s;
}
.user-chip:hover { background: var(--glass-bg); }
.avatar {
  width: 34px; height: 34px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}
.user-info { flex: 1; min-width: 0; }
.user-info .user-name { font-size: 13px; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.user-info .user-email { font-size: 11px; color: var(--text-muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* Main content */
.main-content {
  margin-left: var(--sidebar-w);
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}
.topbar {
  height: var(--topbar-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  background: rgba(10,10,26,0.5);
  backdrop-filter: var(--blur-sm);
  -webkit-backdrop-filter: var(--blur-sm);
  border-bottom: 1px solid var(--glass-border-soft);
  position: sticky;
  top: 0;
  z-index: 50;
}
.topbar-title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
}
.topbar-actions { display: flex; gap: 8px; align-items: center; }
.hamburger {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 22px;
  cursor: pointer;
  padding: 4px;
}

.page-body {
  flex: 1;
  padding: 28px 24px;
  max-width: 1100px;
  width: 100%;
  margin: 0 auto;
}

/* ─── Dashboard Grid ─────────────────────────────────────── */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 28px;
}
.stat-card {
  padding: 22px;
  display: flex;
  align-items: center;
  gap: 16px;
}
.stat-icon {
  font-size: 32px;
  filter: drop-shadow(0 0 10px rgba(255,255,255,0.2));
}
.stat-info .stat-value {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 800;
  line-height: 1;
}
.stat-info .stat-label {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 4px;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}
.section-title {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
}

/* ─── Classes Grid ───────────────────────────────────────── */
.classes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}
.class-card {
  padding: 22px;
  cursor: pointer;
  transition: all .25s;
  position: relative;
  overflow: hidden;
}
.class-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  background: var(--card-color, var(--accent));
}
.class-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--glass-shadow-lg);
  background: var(--glass-bg-strong);
}
.class-card-icon { font-size: 36px; margin-bottom: 10px; }
.class-card-name {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 8px;
}
.class-card-meta {
  display: flex;
  gap: 12px;
  font-size: 12px;
  color: var(--text-secondary);
}
.class-card-meta span { display: flex; align-items: center; gap: 4px; }

/* ─── Class Detail Page ──────────────────────────────────── */
.class-header {
  padding: 28px;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 20px;
}
.class-header-icon { font-size: 52px; filter: drop-shadow(0 0 20px rgba(255,255,255,0.2)); }
.class-header-info h1 {
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 800;
}
.class-header-info p { color: var(--text-secondary); font-size: 14px; margin-top: 4px; }
.class-tabs {
  display: flex;
  gap: 4px;
  padding: 4px;
  margin-bottom: 24px;
  display: inline-flex;
}
.class-tab {
  padding: 9px 20px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all .2s;
  background: transparent;
  color: var(--text-secondary);
  border: none;
}
.class-tab.active {
  background: var(--glass-bg-strong);
  color: var(--text-primary);
  box-shadow: 0 2px 8px rgba(0,0,0,0.3), inset 0 1px 0 rgba(255,255,255,0.15);
}

/* ─── Notes ──────────────────────────────────────────────── */
.notes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}
.note-card {
  padding: 20px;
  cursor: pointer;
  transition: all .2s;
}
.note-card:hover { transform: translateY(-2px); background: var(--glass-bg-strong); }
.note-card h3 { font-size: 15px; font-weight: 600; margin-bottom: 8px; }
.note-card p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.note-card .note-date { font-size: 11px; color: var(--text-muted); margin-top: 12px; }

/* Note editor */
.note-editor { padding: 28px; }
.note-editor .note-title-input {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 700;
  background: transparent;
  border: none;
  color: var(--text-primary);
  outline: none;
  width: 100%;
  margin-bottom: 16px;
}
.note-editor .note-title-input::placeholder { color: var(--text-muted); }
.note-editor textarea {
  min-height: 350px;
  border-radius: var(--radius-md);
}

/* ─── Checklists ─────────────────────────────────────────── */
.checklist-card { padding: 22px; margin-bottom: 16px; }
.checklist-title {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.checklist-progress {
  height: 3px;
  border-radius: 99px;
  background: rgba(255,255,255,0.1);
  margin-bottom: 14px;
  overflow: hidden;
}
.checklist-progress-bar {
  height: 100%;
  border-radius: 99px;
  background: linear-gradient(90deg, var(--accent), var(--emerald));
  transition: width .4s ease;
}
.checklist-items { display: flex; flex-direction: column; gap: 6px; }
.checklist-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.04);
  border: 1px solid transparent;
  transition: all .15s;
}
.checklist-item:hover { background: rgba(255,255,255,0.08); border-color: var(--glass-border-soft); }
.checklist-item.done .item-text {
  text-decoration: line-through;
  color: var(--text-muted);
}
.checkbox-custom {
  width: 18px; height: 18px;
  border: 2px solid var(--glass-border);
  border-radius: 5px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  transition: all .15s;
  flex-shrink: 0;
}
.checkbox-custom.checked {
  background: var(--accent);
  border-color: var(--accent);
}
.item-text { flex: 1; font-size: 14px; }
.item-due {
  font-size: 11px;
  color: var(--text-muted);
  white-space: nowrap;
}
.item-due.overdue { color: #F87171; }
.item-actions { display: flex; gap: 4px; opacity: 0; transition: opacity .15s; }
.checklist-item:hover .item-actions { opacity: 1; }

.add-item-row {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}
.add-item-row input {
  flex: 1;
  padding: 9px 14px;
  background: rgba(255,255,255,0.06);
  border: 1px dashed var(--glass-border-soft);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 13px;
  font-family: var(--font-body);
  outline: none;
  transition: all .2s;
}
.add-item-row input:focus { border-color: var(--accent); background: rgba(255,255,255,0.1); }
.add-item-row input::placeholder { color: var(--text-muted); }

/* ─── Modal ──────────────────────────────────────────────── */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(6px);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s;
}
.modal-backdrop.open { opacity: 1; pointer-events: all; }
.modal {
  width: 100%;
  max-width: 480px;
  padding: 32px;
  transform: translateY(10px);
  transition: transform .25s;
}
.modal-backdrop.open .modal { transform: translateY(0); }
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}
.modal-title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
}
.modal-close {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 20px;
  cursor: pointer;
  padding: 4px;
  border-radius: 6px;
  transition: all .15s;
}
.modal-close:hover { color: var(--text-primary); background: var(--glass-bg); }
.modal-footer { display: flex; gap: 10px; justify-content: flex-end; margin-top: 24px; }

/* ─── Color Picker ───────────────────────────────────────── */
.color-palette { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 8px; }
.color-swatch {
  width: 28px; height: 28px;
  border-radius: 50%;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all .15s;
}
.color-swatch.selected { border-color: #fff; transform: scale(1.15); }

/* ─── Emoji Picker ───────────────────────────────────────── */
.emoji-options { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 8px; }
.emoji-btn {
  font-size: 22px;
  padding: 6px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  background: transparent;
  border: 2px solid transparent;
  transition: all .15s;
}
.emoji-btn.selected { background: var(--glass-bg); border-color: var(--glass-border); }

/* ─── Toast ──────────────────────────────────────────────── */
.toast-container {
  position: fixed;
  bottom: 24px; right: 24px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.toast {
  padding: 12px 18px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 10px;
  animation: slideIn .3s ease;
  max-width: 320px;
}
.toast.success { background: rgba(52,211,153,0.2); border: 1px solid rgba(52,211,153,0.4); color: #6EE7B7; }
.toast.error   { background: rgba(239,68,68,0.2);  border: 1px solid rgba(239,68,68,0.4);  color: #FCA5A5; }
.toast.info    { background: rgba(124,106,247,0.2); border: 1px solid rgba(124,106,247,0.4); color: #C4B5FD; }

@keyframes slideIn {
  from { transform: translateX(40px); opacity: 0; }
  to   { transform: translateX(0);    opacity: 1; }
}

/* ─── Empty State ────────────────────────────────────────── */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-secondary);
}
.empty-state .empty-icon { font-size: 52px; margin-bottom: 16px; opacity: 0.7; }
.empty-state h3 { font-size: 16px; font-weight: 600; margin-bottom: 8px; color: var(--text-primary); }
.empty-state p  { font-size: 14px; }

/* ─── Alert / Error ──────────────────────────────────────── */
.alert {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  margin-bottom: 16px;
}
.alert-error { background: rgba(239,68,68,0.15); border: 1px solid rgba(239,68,68,0.3); color: #FCA5A5; }
.alert-success { background: rgba(52,211,153,0.15); border: 1px solid rgba(52,211,153,0.3); color: #6EE7B7; }

/* ─── Pending Tasks Widget ───────────────────────────────── */
.pending-list { display: flex; flex-direction: column; gap: 8px; }
.pending-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.04);
  font-size: 13px;
  cursor: pointer;
  transition: all .15s;
}
.pending-item:hover { background: rgba(255,255,255,0.08); }
.pending-item .class-badge {
  font-size: 10px;
  padding: 2px 8px;
  border-radius: 20px;
  background: rgba(124,106,247,0.2);
  color: var(--accent-2);
  flex-shrink: 0;
}
.pending-item .pending-text { flex: 1; min-width: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* ─── Loader ─────────────────────────────────────────────── */
.loader {
  display: inline-block;
  width: 18px; height: 18px;
  border: 2px solid rgba(255,255,255,0.2);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ─── Scrollbar ──────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.15); border-radius: 99px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.25); }

/* ─── Responsive ─────────────────────────────────────────── */
@media (max-width: 900px) {
  .stats-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 700px) {
  :root { --sidebar-w: 0px; }
  .sidebar {
    transform: translateX(-260px);
    width: 260px;
  }
  .sidebar.open { transform: translateX(0); }
  .main-content { margin-left: 0; }
  .hamburger { display: flex; }
  .topbar { padding: 0 16px; }
  .page-body { padding: 20px 16px; }
  .stats-grid { grid-template-columns: 1fr; }
  .classes-grid { grid-template-columns: 1fr; }
  .notes-grid { grid-template-columns: 1fr; }
  .auth-card { padding: 32px 24px; }
  .modal { padding: 24px; }
  .sidebar-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 99;
    display: none;
  }
  .sidebar-overlay.open { display: block; }
}