/* ================================================================
   MIUIX Design System — 课时记录工具
   Monet 动态取色 | 液态玻璃 | 悬浮胶囊底栏 | 弹簧动画 | 国际化
   ================================================================ */

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

:root {
  /* Seed color (CSS fallback) */
  --seed-h: 215;
  --seed-s: 82%;
  --seed-l: 52%;

  /* Monet palette — light theme */
  --primary: hsl(var(--seed-h), var(--seed-s), var(--seed-l));
  --on-primary: #fff;
  --primary-container: hsl(var(--seed-h), calc(var(--seed-s) * 0.6), 92%);
  --on-primary-container: hsl(var(--seed-h), calc(var(--seed-s) * 0.8), 20%);
  --secondary: hsl(var(--seed-h), calc(var(--seed-s) * 0.3), 45%);
  --on-secondary: #fff;
  --secondary-container: hsl(var(--seed-h), calc(var(--seed-s) * 0.2), 92%);
  --tertiary: hsl(calc(var(--seed-h) + 40), calc(var(--seed-s) * 0.5), 45%);

  --surface: #fff;
  --surface-dim: hsl(0, 0%, 96%);
  --surface-glass: hsla(0, 0%, 100%, 0.72);
  --surface-glass-strong: hsla(0, 0%, 100%, 0.85);
  --background: hsl(0, 0%, 97%);
  --on-surface: hsl(0, 0%, 10%);
  --on-surface-variant: hsl(0, 0%, 45%);
  --outline: hsl(0, 0%, 88%);
  --outline-variant: hsl(0, 0%, 93%);

  --danger: hsl(4, 90%, 58%);
  --success: hsl(122, 39%, 49%);
  --warning: hsl(45, 100%, 51%);

  /* Glass effect params */
  --glass-blur: 20px;
  --glass-saturate: 1.8;
  --glass-opacity: 0.72;
  --glass-border: hsla(0, 0%, 100%, 0.18);
  --glass-highlight: hsla(0, 0%, 100%, 0.40);
  --glass-shadow: 0 8px 32px rgba(0,0,0,0.08);

  /* Layout */
  --radius-sm: 8px;
  --radius: 16px;
  --radius-lg: 24px;
  --nav-height: 72px;
  --topbar-height: 56px;
  --font-xl: 20px;
  --font-lg: 16px;
  --font-md: 14px;
  --font-sm: 12px;

  /* Spring animation */
  --spring-duration: 0.55s;
  --spring-curve: cubic-bezier(0.16, 1, 0.3, 1);
  --spring-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ---- Dark Theme ---- */
body.dark {
  --surface: hsl(0, 0%, 12%);
  --surface-dim: hsl(0, 0%, 8%);
  --surface-glass: hsla(0, 0%, 12%, 0.72);
  --surface-glass-strong: hsla(0, 0%, 12%, 0.88);
  --background: hsl(0, 0%, 7%);
  --on-surface: hsl(0, 0%, 92%);
  --on-surface-variant: hsl(0, 0%, 65%);
  --outline: hsl(0, 0%, 22%);
  --outline-variant: hsl(0, 0%, 18%);
  --glass-border: hsla(0, 0%, 100%, 0.08);
  --glass-highlight: hsla(0, 0%, 100%, 0.08);
  --glass-shadow: 0 8px 32px rgba(0,0,0,0.3);
  --primary-container: hsl(var(--seed-h), calc(var(--seed-s) * 0.6), 20%);
  --on-primary-container: hsl(var(--seed-h), calc(var(--seed-s) * 0.4), 85%);
  --secondary-container: hsl(var(--seed-h), calc(var(--seed-s) * 0.2), 20%);
}

/* ---- Body ---- */
body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
  background: var(--background);
  color: var(--on-surface);
  font-size: var(--font-md);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overscroll-behavior: none;
  overflow-x: hidden;
}

#app {
  max-width: 480px;
  margin: 0 auto;
  min-height: 100vh;
  position: relative;
  padding-bottom: calc(var(--nav-height) + 24px + env(safe-area-inset-bottom));
}

/* ================================================================
   LIQUID GLASS TOP BAR
   ================================================================ */

.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--topbar-height);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 16px;
  /* Glass layers */
  background: var(--surface-glass-strong);
  backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
  border-bottom: 1px solid var(--glass-border);
  /* Subtle inner highlight */
  box-shadow: 0 1px 0 var(--glass-highlight) inset;
}

.topbar .back-btn {
  position: absolute;
  left: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px; height: 36px;
  border: none; background: none;
  font-size: 20px; cursor: pointer;
  border-radius: 50%;
  color: var(--on-surface);
  transition: background 0.2s, transform 0.2s var(--spring-curve);
}
.topbar .back-btn.hidden { display: none; }
.topbar .back-btn:active {
  background: var(--outline-variant);
  transform: scale(0.9);
}
.topbar .title {
  font-size: var(--font-lg);
  font-weight: 600;
  letter-spacing: -0.2px;
}

/* ================================================================
   PAGE CONTAINER — Spring Transition
   ================================================================ */

.page {
  display: none;
  padding: 16px;
  min-height: calc(100vh - var(--topbar-height) - var(--nav-height) - 24px);
  animation: pageIn var(--spring-duration) var(--spring-curve);
}
.page.active { display: block; }

@keyframes pageIn {
  from { opacity: 0; transform: translateY(12px) scale(0.98); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

/* ================================================================
   FLOATING CAPSULE BOTTOM NAV
   ================================================================ */

.bottom-nav {
  position: fixed;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  width: calc(100% - 32px);
  max-width: 448px;
  height: var(--nav-height);
  z-index: 200;
  /* Capsule shape */
  border-radius: 9999px;
  /* Liquid glass */
  background: var(--surface-glass);
  backdrop-filter: blur(24px) saturate(2);
  -webkit-backdrop-filter: blur(24px) saturate(2);
  border: 1px solid var(--glass-border);
  box-shadow:
    0 0 0 1px var(--glass-highlight) inset,
    0 4px 24px rgba(0,0,0,0.10),
    0 1px 4px rgba(0,0,0,0.06);
  display: flex;
  align-items: center;
  padding: 4px;
  padding-bottom: calc(4px + env(safe-area-inset-bottom));
  transition: transform 0.4s var(--spring-curve), opacity 0.3s;
}
.bottom-nav.hidden {
  transform: translateX(-50%) translateY(120px);
  opacity: 0;
  pointer-events: none;
}

.nav-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border: none;
  background: none;
  cursor: pointer;
  font-size: 11px;
  font-weight: 500;
  color: var(--on-surface-variant);
  transition: all 0.3s var(--spring-curve);
  gap: 2px;
  border-radius: 9999px;
  padding: 6px 0;
  position: relative;
}
.nav-item:hover {
  color: var(--on-surface);
}
.nav-item:hover .nav-icon {
  transform: scale(1.08);
}
.nav-item.active {
  color: var(--primary);
  font-weight: 600;
  background: var(--primary-container);
}
.nav-item:active {
  transform: scale(0.92);
}
.nav-item .nav-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px; height: 28px;
  transition: transform 0.2s var(--spring-bounce);
}
.nav-item.active .nav-icon {
  transform: scale(1.1);
}
.nav-item .nav-icon svg {
  width: 24px; height: 24px;
}

/* ================================================================
   LIQUID GLASS CARDS
   ================================================================ */

.card {
  position: relative;
  background: var(--surface-glass);
  backdrop-filter: blur(16px) saturate(1.6);
  -webkit-backdrop-filter: blur(16px) saturate(1.6);
  border-radius: var(--radius-lg);
  padding: 18px;
  margin-bottom: 14px;
  border: 1px solid var(--glass-border);
  box-shadow:
    0 0 0 1px var(--glass-highlight) inset,
    0 4px 20px rgba(0,0,0,0.06),
    0 1px 3px rgba(0,0,0,0.04);
  transition: transform 0.2s var(--spring-curve), box-shadow 0.2s;
  overflow: hidden;
}
/* Optical refraction highlight */
.card::after {
  content: '';
  position: absolute;
  top: 0; left: 12px; right: 12px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--glass-highlight), transparent);
  opacity: 0.6;
  pointer-events: none;
}
.card:active {
  transform: scale(0.985);
  box-shadow:
    0 0 0 1px var(--glass-highlight) inset,
    0 2px 8px rgba(0,0,0,0.08);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 10px;
}
.card-title { font-size: 18px; font-weight: 600; margin-bottom: 2px; }
.card-subtitle { color: var(--on-surface-variant); font-size: var(--font-md); }
.card-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 8px;
}
.card-tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 9999px;
  font-size: var(--font-sm);
  font-weight: 500;
}
.card-tag.active {
  background: var(--primary-container);
  color: var(--on-primary-container);
}
.card-tag.finished {
  background: var(--surface-dim);
  color: var(--on-surface-variant);
}
.card-actions {
  display: flex;
  gap: 8px;
  margin-top: 14px;
  justify-content: flex-end;
}

/* ================================================================
   BUTTONS
   ================================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  border-radius: 9999px;
  border: none;
  font-size: var(--font-md);
  cursor: pointer;
  transition: all 0.25s var(--spring-curve);
  font-weight: 500;
  letter-spacing: 0.2px;
}
.btn:hover {
  transform: translateY(-1px);
}
.btn:active {
  transform: scale(0.95);
  opacity: 0.85;
}
.btn-primary {
  background: var(--primary);
  color: var(--on-primary);
  box-shadow: 0 2px 8px hsla(var(--seed-h), var(--seed-s), var(--seed-l), 0.35);
}
.btn-primary:hover {
  box-shadow: 0 6px 20px hsla(var(--seed-h), var(--seed-s), var(--seed-l), 0.45);
  transform: translateY(-2px);
}
.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 1.5px solid var(--outline);
}
.btn-outline:hover {
  background: var(--primary-container);
  border-color: var(--primary);
  transform: translateY(-1px);
}
.btn-outline:active {
  background: var(--primary-container);
  border-color: var(--primary);
}
.btn-danger {
  background: var(--danger);
  color: #fff;
}
.btn-danger:hover {
  box-shadow: 0 6px 20px rgba(229, 57, 53, 0.4);
  transform: translateY(-2px);
}
.btn-ghost {
  background: transparent;
  color: var(--on-surface-variant);
}
.btn-ghost:hover {
  background: var(--outline-variant);
  color: var(--on-surface);
}
.btn-sm { padding: 6px 14px; font-size: var(--font-sm); }
.btn-block { width: 100%; }
.btn-group { display: flex; gap: 10px; }

/* ================================================================
   FORM ELEMENTS
   ================================================================ */

.form-group { margin-bottom: 16px; }
.form-label {
  display: block;
  font-size: var(--font-sm);
  color: var(--on-surface-variant);
  margin-bottom: 6px;
  font-weight: 500;
}
.form-input {
  width: 100%;
  padding: 12px 14px;
  border: 1.5px solid var(--outline);
  border-radius: var(--radius);
  font-size: var(--font-md);
  background: var(--surface-glass);
  color: var(--on-surface);
  outline: none;
  transition: all 0.2s;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.form-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px hsla(var(--seed-h), var(--seed-s), var(--seed-l), 0.15);
}
.form-row { display: flex; gap: 12px; }
.form-row > * { flex: 1; }

/* ================================================================
   TABS
   ================================================================ */

.tabs {
  display: flex;
  position: relative;
  background: var(--outline-variant);
  border-radius: 9999px;
  padding: 4px;
  margin-bottom: 16px;
  backdrop-filter: blur(12px) saturate(1.5);
  -webkit-backdrop-filter: blur(12px) saturate(1.5);
  border: 1px solid var(--glass-border);
  --tab-left: 4px;
  --tab-width: 0px;
}
/* Sliding indicator pill */
.tabs::after {
  content: '';
  position: absolute;
  top: 4px;
  left: var(--tab-left);
  width: var(--tab-width);
  height: calc(100% - 8px);
  background: var(--surface);
  border-radius: 9999px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
  transition: left 0.35s var(--spring-curve), width 0.35s var(--spring-curve);
  pointer-events: none;
  z-index: 0;
}
.tab {
  flex: 1;
  padding: 10px 12px;
  text-align: center;
  border: none;
  background: none;
  border-radius: 9999px;
  font-size: var(--font-sm);
  font-weight: 500;
  cursor: pointer;
  color: var(--on-surface-variant);
  transition: color 0.3s var(--spring-curve);
  white-space: nowrap;
  position: relative;
  z-index: 1;
}
.tab:hover {
  color: var(--on-surface);
}
.tab.active {
  color: var(--primary);
  font-weight: 600;
  background: none;
  box-shadow: none;
}

/* Weekday tabs */
.weekday-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 12px;
}
.weekday-tab {
  padding: 8px 12px;
  border-radius: 9999px;
  font-size: var(--font-sm);
  cursor: pointer;
  background: var(--outline-variant);
  color: var(--on-surface-variant);
  border: none;
  font-weight: 500;
  transition: all 0.2s var(--spring-curve);
}
.weekday-tab.active {
  background: var(--primary);
  color: var(--on-primary);
}
.weekday-tab:active { transform: scale(0.93); }

/* ================================================================
   TIME SLOT CARDS
   ================================================================ */

.slot-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 14px;
  background: var(--surface-dim);
  border-radius: var(--radius);
  margin-bottom: 8px;
  font-size: var(--font-md);
}
.slot-card .slot-del { color: var(--danger); cursor: pointer; padding: 4px; font-weight: 600; }

/* ================================================================
   STATS
   ================================================================ */

.stats {
  display: flex;
  gap: 12px;
  margin-bottom: 16px;
}
.stat-item {
  flex: 1;
  text-align: center;
  padding: 18px;
  background: var(--surface-glass);
  border-radius: var(--radius-lg);
  border: 1px solid var(--glass-border);
  box-shadow:
    0 0 0 1px var(--glass-highlight) inset,
    0 2px 12px rgba(0,0,0,0.04);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.stat-num { font-size: 30px; font-weight: 700; color: var(--primary); font-variant-numeric: tabular-nums; }
.stat-label { font-size: var(--font-sm); color: var(--on-surface-variant); margin-top: 4px; }

/* ================================================================
   MENU LIST
   ================================================================ */

.menu-list {
  background: var(--surface-glass);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--glass-border);
  box-shadow: 0 2px 16px rgba(0,0,0,0.04);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.menu-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 18px;
  border-bottom: 1px solid var(--outline-variant);
  cursor: pointer;
  background: none;
  border: none;
  width: 100%;
  text-align: left;
  font-size: var(--font-md);
  color: var(--on-surface);
  transition: background 0.15s;
}
.menu-item:last-child { border-bottom: none; }
.menu-item:hover { background: var(--outline-variant); }
.menu-item:active { background: var(--surface-dim); }
.menu-item .menu-arrow { color: var(--on-surface-variant); font-size: 18px; }
.menu-item .menu-title { font-weight: 500; }
.menu-item .menu-summary { font-size: var(--font-sm); color: var(--on-surface-variant); margin-top: 2px; }

/* ================================================================
   MODAL / OVERLAY — bottom sheet glass
   ================================================================ */

.overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 300;
  align-items: flex-end;
  justify-content: center;
  animation: fadeIn 0.25s ease;
}
.overlay.show { display: flex; }

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.modal {
  background: var(--surface-glass-strong);
  backdrop-filter: blur(28px) saturate(2);
  -webkit-backdrop-filter: blur(28px) saturate(2);
  border-radius: 24px 24px 0 0;
  width: 100%;
  max-width: 480px;
  max-height: 85vh;
  overflow-y: auto;
  padding: 24px 18px;
  border: 1px solid var(--glass-border);
  box-shadow:
    0 0 0 1px var(--glass-highlight) inset,
    0 -8px 32px rgba(0,0,0,0.12);
  animation: slideUp 0.4s var(--spring-curve);
}
@keyframes slideUp {
  from { transform: translateY(100%); }
  to { transform: translateY(0); }
}
.modal-title { font-size: var(--font-lg); font-weight: 600; margin-bottom: 18px; text-align: center; }
.modal-actions { display: flex; gap: 12px; margin-top: 18px; }

/* ================================================================
   EMPTY STATE
   ================================================================ */

.empty {
  text-align: center;
  padding: 60px 20px;
  color: var(--on-surface-variant);
}
.empty-icon { margin-bottom: 16px; opacity: 0.5; }
.empty-text { font-size: var(--font-md); white-space: pre-line; }

/* ================================================================
   SWITCH
   ================================================================ */

.switch-wrap { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; }
.switch {
  position: relative;
  width: 52px; height: 32px;
  background: var(--outline);
  border-radius: 9999px;
  cursor: pointer;
  transition: background 0.25s var(--spring-curve);
}
.switch.on { background: var(--primary); }
.switch::after {
  content: '';
  position: absolute;
  top: 3px; left: 3px;
  width: 26px; height: 26px;
  background: #fff;
  border-radius: 50%;
  transition: transform 0.25s var(--spring-bounce);
  box-shadow: 0 1px 4px rgba(0,0,0,0.15);
}
.switch.on::after { transform: translateX(20px); }

/* ================================================================
   FAB
   ================================================================ */

.fab {
  position: fixed;
  bottom: calc(var(--nav-height) + 32px);
  right: 24px;
  width: 56px; height: 56px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  border: none;
  font-size: 24px;
  cursor: pointer;
  box-shadow: 0 4px 16px hsla(var(--seed-h), var(--seed-s), var(--seed-l), 0.4);
  z-index: 150;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s var(--spring-curve), box-shadow 0.2s;
}
.fab:active {
  transform: scale(0.9);
  box-shadow: 0 2px 8px hsla(var(--seed-h), var(--seed-s), var(--seed-l), 0.3);
}

/* ================================================================
   RECORD ROW
   ================================================================ */

.record-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid var(--outline-variant);
}
.record-row:last-child { border-bottom: none; }
.record-date { color: var(--on-surface-variant); font-size: var(--font-sm); }

/* ================================================================
   TOAST
   ================================================================ */

.toast {
  position: fixed;
  top: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--on-surface);
  color: var(--surface);
  padding: 12px 24px;
  border-radius: 9999px;
  font-size: var(--font-md);
  font-weight: 500;
  z-index: 400;
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
  box-shadow: 0 4px 16px rgba(0,0,0,0.2);
}
.toast.show { opacity: 1; }

/* ================================================================
   CHECKIN HINT
   ================================================================ */

.checkin-hint {
  display: none;
  text-align: center;
  padding: 10px;
  background: hsla(45, 100%, 51%, 0.15);
  color: hsl(45, 80%, 30%);
  border-radius: var(--radius);
  margin-bottom: 14px;
  font-size: var(--font-sm);
  font-weight: 500;
  border: 1px solid hsla(45, 100%, 51%, 0.25);
}

/* ================================================================
   LAYOUT SWITCHER
   ================================================================ */

.layout-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}
.layout-grid .card {
  margin-bottom: 0;
}
.layout-grid .card-actions {
  flex-direction: column;
  justify-content: flex-start;
}
.layout-grid .card-actions .btn {
  width: 100%;
}

/* ================================================================
   THEME SETTINGS
   ================================================================ */

.theme-panel {
  background: var(--surface-glass);
  border-radius: var(--radius-lg);
  padding: 16px;
  border: 1px solid var(--glass-border);
  margin-bottom: 16px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

/* ================================================================
   LIQUID GLASS EFFECT — inspired by shuding/liquid-glass
   ================================================================ */

/* When glass is disabled, fall back to solid */
.no-glass,
.no-glass.topbar,
.no-glass.bottom-nav,
.no-glass.card,
.no-glass.modal,
.no-glass.stat-item,
.no-glass.menu-list,
.no-glass.form-input {
  backdrop-filter: none !important;
  -webkit-backdrop-filter: none !important;
  background: var(--surface) !important;
  border-color: var(--outline) !important;
  box-shadow: 0 1px 3px rgba(0,0,0,0.06) !important;
}
.no-glass.topbar {
  background: var(--surface) !important;
  border-bottom: 1px solid var(--outline) !important;
}
.no-glass.bottom-nav {
  background: var(--surface) !important;
  border: 1px solid var(--outline) !important;
}
.no-glass.tabs {
  backdrop-filter: none !important;
  -webkit-backdrop-filter: none !important;
  background: var(--outline-variant) !important;
  border-color: var(--outline) !important;
}
.no-glass.card::after,
.no-glass.modal::after {
  display: none;
}

/* Liquid glass animation — subtle noise-based morphing */
.liquid-glass-animate {
  animation: liquidMorph 8s ease-in-out infinite;
}
@keyframes liquidMorph {
  0%, 100% { filter: url(#liquid-glass-filter-light); }
  50% { filter: url(#liquid-glass-filter); }
}

/* Reduce motion preference */
@media (prefers-reduced-motion: reduce) {
  .liquid-glass-animate {
    animation: none;
  }
}
/* ================================================================
   SCROLLABLE
   ================================================================ */

.scrollable { overflow-y: auto; }

/* ================================================================
   RESPONSIVE: wider than 480px — center card
   ================================================================ */

@media (min-width: 481px) {
  #app {
    border-left: 1px solid var(--outline-variant);
    border-right: 1px solid var(--outline-variant);
  }
}

/* ================================================================
   AUTH — Login / Register Overlay
   ================================================================ */

.auth-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--background);
  z-index: 500;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
.auth-card {
  width: 100%;
  max-width: 380px;
  background: var(--surface-glass);
  backdrop-filter: blur(24px) saturate(2);
  -webkit-backdrop-filter: blur(24px) saturate(2);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  border: 1px solid var(--glass-border);
  box-shadow:
    0 0 0 1px var(--glass-highlight) inset,
    0 8px 40px rgba(0,0,0,0.1);
  animation: cardIn 0.5s var(--spring-curve);
}
@keyframes cardIn {
  from { opacity: 0; transform: translateY(24px) scale(0.96); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}
.auth-header {
  text-align: center;
  margin-bottom: 28px;
}
.auth-header svg {
  margin-bottom: 12px;
  opacity: 0.8;
}
.auth-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--on-surface);
  letter-spacing: -0.3px;
}
.auth-subtitle {
  font-size: var(--font-sm);
  color: var(--on-surface-variant);
  margin-top: 6px;
}
.auth-form {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.auth-error {
  color: var(--danger);
  font-size: var(--font-sm);
  min-height: 20px;
  text-align: center;
  margin-bottom: 4px;
}
.auth-switch {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  margin-top: 12px;
  font-size: var(--font-sm);
  color: var(--on-surface-variant);
}

/* HopoAuth divider */
.hopo-divider {
  display: flex;
  align-items: center;
  margin: 16px 0;
}
.hopo-divider::before,
.hopo-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--outline);
}
.hopo-divider-text {
  padding: 0 12px;
  font-size: var(--font-sm);
  color: var(--on-surface-variant);
}

/* HopoAuth circular button */
.hopo-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  margin: 0 auto;
  border-radius: 50%;
  border: none;
  background: var(--primary);
  color: var(--on-primary);
  cursor: pointer;
  transition: transform 0.25s var(--spring-curve), box-shadow 0.25s var(--spring-curve);
  box-shadow: 0 2px 8px hsla(var(--seed-h), var(--seed-s), var(--seed-l), 0.35);
}
.hopo-btn:hover {
  transform: scale(1.08);
  box-shadow: 0 6px 20px hsla(var(--seed-h), var(--seed-s), var(--seed-l), 0.45);
}
.hopo-btn:active {
  transform: scale(0.92);
}

/* ================================================================
   USER INFO PAGE
   ================================================================ */

.user-info-card {
  text-align: center;
  padding: 24px 16px 20px;
  background: var(--surface-glass);
  border-radius: var(--radius-lg);
  border: 1px solid var(--glass-border);
  margin-bottom: 12px;
}
.user-avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--primary-container);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 12px;
}
.user-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--on-surface);
}
.user-id {
  font-size: var(--font-sm);
  color: var(--on-surface-variant);
  margin-top: 4px;
  font-family: monospace;
}
.info-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid var(--outline-variant);
}
.info-row:last-child {
  border-bottom: none;
}
.info-label {
  font-size: var(--font-sm);
  color: var(--on-surface-variant);
}
.info-value {
  font-weight: 500;
  color: var(--on-surface);
}

/* ================================================================
   ADMIN PANEL
   ================================================================ */

.admin-panel {
  display: none;
  flex-direction: column;
  min-height: 100dvh;
  background: var(--background);
}
.admin-topbar {
  justify-content: space-between;
}
.admin-topbar .back-btn {
  display: none;
}
.admin-content {
  padding: 16px;
  flex: 1;
  overflow-y: auto;
}
.admin-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 0;
  border-bottom: 1px solid var(--outline-variant);
}
.admin-row:last-child {
  border-bottom: none;
}
.admin-user-row:hover {
  background: var(--surface-variant);
  margin: 0 -14px;
  padding-left: 14px;
  padding-right: 14px;
  border-radius: 8px;
  transition: background 0.2s;
}
#adminTabContent {
  margin-top: 12px;
  background: var(--surface-glass);
  border-radius: var(--radius-md);
  padding: 0 14px;
  border: 1px solid var(--glass-border);
}
#adminDetailTabContent {
  margin-top: 12px;
  background: var(--surface-glass);
  border-radius: var(--radius-md);
  padding: 0 14px;
  border: 1px solid var(--glass-border);
}