:root {
  color-scheme: light;
}

:root[data-theme='dark'] {
  color-scheme: dark;
  --bg: #12110f;
  --surface: #1c1a17;
  --surface-muted: #27231f;
  --text: #f2eee7;
  --text-secondary: #bbb3aa;
  --text-tertiary: #8d857c;
  --accent: #f2eee7;
  --warm-accent: #d49a3e;
  --border: #36312b;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.24), 0 1px 2px rgba(0,0,0,0.18);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.24);
  --shadow-lg: 0 14px 46px rgba(0,0,0,0.34);
}

.theme-toggle {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  flex-shrink: 0;
  border: 1px solid rgba(70,58,46,0.14);
  border-radius: 50%;
  background: rgba(255,255,255,0.84);
  color: #2d2823;
  cursor: pointer;
  box-shadow: 0 4px 18px rgba(42,35,30,0.05);
  backdrop-filter: blur(12px);
  transition: color 0.15s ease, background 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}

.theme-toggle:hover {
  transform: translateY(-1px);
  box-shadow: 0 7px 22px rgba(42,35,30,0.1);
}

.theme-toggle:focus-visible {
  outline: 2px solid #a96743;
  outline-offset: 3px;
}

.theme-icon {
  width: 19px;
  height: 19px;
}

.theme-icon-moon {
  display: none;
}

:root[data-theme='dark'] .theme-icon-sun {
  display: none;
}

:root[data-theme='dark'] .theme-icon-moon {
  display: block;
}

.page-actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

:root[data-theme='dark'] body {
  background: #12110f;
  color: var(--text);
}

:root[data-theme='dark'] .theme-toggle,
:root[data-theme='dark'] .notification-bell,
:root[data-theme='dark'] .community-icon,
:root[data-theme='dark'] .mobile-nav summary,
:root[data-theme='dark'] .auth-trigger {
  border-color: rgba(255,255,255,0.13);
  background: rgba(30,27,23,0.86);
  color: #f0ebe3;
  box-shadow: 0 5px 20px rgba(0,0,0,0.2);
}

:root[data-theme='dark'] .notification-indicator {
  border-color: #1e1b17;
  background: #e3a348;
}

:root[data-theme='dark'] .landing-hero {
  background: #17140f;
}

:root[data-theme='dark'] .landing-hero::before {
  background:
    linear-gradient(90deg, #15130f 0%, #15130f 48%, rgba(21,19,15,0.96) 54%, rgba(21,19,15,0.69) 66%, rgba(21,19,15,0.14) 81%),
    linear-gradient(180deg, rgba(0,0,0,0.1), rgba(0,0,0,0.28));
}

:root[data-theme='dark'] .hero-art img {
  filter: brightness(0.64) saturate(0.8);
}

:root[data-theme='dark'] .brand,
:root[data-theme='dark'] .desktop-nav a,
:root[data-theme='dark'] .landing-hero h1 {
  color: #f5f0e8;
}

:root[data-theme='dark'] .brand-tagline,
:root[data-theme='dark'] .landing-hero .intro {
  color: #c8c0b6;
}

:root[data-theme='dark'] .hero-search {
  border-color: rgba(255,255,255,0.12);
  background: rgba(28,25,21,0.94);
  box-shadow: 0 8px 26px rgba(0,0,0,0.2);
}

:root[data-theme='dark'] .hero-search .search-input {
  color: #f2eee7;
}

:root[data-theme='dark'] .hero-search .search-input::placeholder {
  color: #8f887f;
}

:root[data-theme='dark'] .landing-hero .tag-btn,
:root[data-theme='dark'] .landing-hero .tag-toggle {
  border-color: rgba(255,255,255,0.13);
  background: rgba(32,29,25,0.74);
  color: #d3cbc1;
}

:root[data-theme='dark'] .landing-main {
  color: var(--text);
}

:root[data-theme='dark'] .landing-main .book-info .authors,
:root[data-theme='dark'] .landing-main .book-info .subtitle,
:root[data-theme='dark'] .collection-header .book-count,
:root[data-theme='dark'] .recent-card-time {
  color: var(--text-secondary);
}

:root[data-theme='dark'] .recent-section,
:root[data-theme='dark'] .about-section {
  background:
    radial-gradient(circle at 90% 10%, rgba(208,145,48,0.1), transparent 18rem),
    #201d19;
}

:root[data-theme='dark'] .recent-card,
:root[data-theme='dark'] .about-pillar {
  background: rgba(255,255,255,0.055);
}

:root[data-theme='dark'] .about-copy > p:last-child,
:root[data-theme='dark'] .about-pillar p {
  color: var(--text-secondary);
}

:root[data-theme='dark'] .landing-main .book-card.online-result {
  background: #201d24;
  box-shadow: inset 0 0 0 1px rgba(174,155,210,0.18);
}

:root[data-theme='dark'] footer {
  background: #191714;
  color: var(--text-tertiary);
}

:root[data-theme='dark'] nav:not(.landing-nav) {
  background: rgba(25,23,20,0.9);
}

:root[data-theme='dark'] nav a {
  color: var(--text-secondary);
}

:root[data-theme='dark'] .hero::after {
  background:
    linear-gradient(90deg, rgba(18,17,15,0.94) 0%, rgba(18,17,15,0.78) 55%, rgba(18,17,15,0.92) 100%),
    linear-gradient(180deg, rgba(0,0,0,0.18), rgba(20,18,16,0.7));
}

:root[data-theme='dark'] .hero-cover {
  background: rgba(255,255,255,0.08);
}

:root[data-theme='dark'] .tag-pill,
:root[data-theme='dark'] .takeaway-num,
:root[data-theme='dark'] .section-number {
  background: var(--surface-muted);
  color: var(--text-secondary);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.07);
}

:root[data-theme='dark'] .takeaway-item,
:root[data-theme='dark'] .concept-card,
:root[data-theme='dark'] .history-card {
  background: var(--surface);
}

:root[data-theme='dark'] .concept-card:nth-child(3n + 2) {
  background: #24201c;
}

:root[data-theme='dark'] .content-empty,
:root[data-theme='dark'] .history-empty {
  background: linear-gradient(145deg, #24201c, #191714);
}

:root[data-theme='dark'] .auth-popover,
:root[data-theme='dark'] .mobile-nav-links {
  border-color: rgba(255,255,255,0.1);
  background: rgba(29,27,24,0.98);
}

:root[data-theme='dark'] .mobile-nav-links button {
  color: var(--text);
}

:root[data-theme='dark'] .auth-title,
:root[data-theme='dark'] .auth-profile-name,
:root[data-theme='dark'] .auth-link,
:root[data-theme='dark'] .mobile-nav-links a {
  color: var(--text);
}

:root[data-theme='dark'] .provider-btn {
  border-color: rgba(255,255,255,0.12);
  color: var(--text);
}

:root[data-theme='dark'] .provider-btn:hover,
:root[data-theme='dark'] .auth-link:hover,
:root[data-theme='dark'] .mobile-nav-links a:hover {
  background: #29251f;
}

:root[data-theme='dark'] .auth-signout {
  border-top-color: #37312b;
}

:root[data-theme='dark'] .subscription-panel {
  border-color: rgba(255,255,255,0.1);
  background:
    radial-gradient(circle at 90% 0, rgba(206,142,42,0.12), transparent 13rem),
    #1c1a17;
  color: var(--text);
}

:root[data-theme='dark'] .subscription-copy,
:root[data-theme='dark'] .subscription-form label {
  color: var(--text-secondary);
}

:root[data-theme='dark'] .subscription-form input[type='email'] {
  border-color: #3b352e;
  background: #12110f;
  color: var(--text);
}

:root[data-theme='dark'] .subscription-form input[type='email'][readonly] {
  background: #24211d;
  color: var(--text-secondary);
}

:root[data-theme='dark'] .subscription-close:hover {
  background: #2b2722;
  color: var(--text);
}

:root[data-theme='dark'] .privacy-note {
  background: #25211d;
}

:root[data-theme='dark'] .clear-history {
  border-color: var(--border);
  background: var(--surface);
  color: var(--text-secondary);
}

:root[data-theme='dark'] .interaction-button {
  border-color: rgba(255,255,255,0.11);
  background: rgba(35,32,28,0.9);
  color: #aaa198;
  box-shadow: 0 3px 12px rgba(0,0,0,0.16);
}

:root[data-theme='dark'] .interaction-button:hover {
  border-color: rgba(255,255,255,0.23);
  color: var(--text);
}

:root[data-theme='dark'] .interaction-button.bookmark.active {
  border-color: rgba(91,150,228,0.35);
  background: rgba(47,111,194,0.2);
  color: #6ca4ec;
}

:root[data-theme='dark'] .interaction-button.upvote.active {
  border-color: rgba(91,180,118,0.35);
  background: rgba(52,138,80,0.2);
  color: #69b77f;
}

:root[data-theme='dark'] .interaction-button.downvote.active {
  border-color: rgba(225,111,105,0.35);
  background: rgba(198,74,69,0.2);
  color: #e1716c;
}

:root[data-theme='dark'] .upvote-count {
  color: #69b77f;
}

:root[data-theme='dark'] .downvote-count {
  color: #e1716c;
}

:root[data-theme='dark'] .collections-empty,
:root[data-theme='dark'] .collections-signin {
  background: var(--surface);
  color: var(--text-secondary);
}

:root[data-theme='dark'] .admin-sidebar {
  border-color: var(--border);
}

:root[data-theme='dark'] .admin-table-wrap,
:root[data-theme='dark'] .feedback-card,
:root[data-theme='dark'] .suggestion-card {
  border-color: var(--border);
  background: var(--surface);
}

:root[data-theme='dark'] .admin-table th,
:root[data-theme='dark'] .admin-table td {
  border-color: var(--border);
}

:root[data-theme='dark'] .admin-add-form input {
  border-color: var(--border);
  background: var(--surface);
  color: var(--text);
}

:root[data-theme='dark'] .admin-icon-button {
  border-color: var(--border);
  color: var(--text-secondary);
}

:root[data-theme='dark'] .collections-section-header p,
:root[data-theme='dark'] .collections-heading > p:last-child {
  color: var(--text-secondary);
}

@media (max-width: 700px) {
  .theme-toggle {
    width: 38px;
    height: 38px;
  }

  :root[data-theme='dark'] .landing-hero::before {
    background:
      linear-gradient(180deg, #15130f 0%, #15130f 49%, rgba(21,19,15,0.96) 58%, rgba(21,19,15,0.65) 70%, rgba(21,19,15,0.12) 82%);
  }
}

@media (prefers-reduced-motion: reduce) {
  .theme-toggle {
    transition: none;
  }
}