/* ═══════════════════════════════════════════════════
   Mahjong Online — Theme CSS
   Hand-crafted with Chinese red & gold palette
   ═══════════════════════════════════════════════════ */

/* —— Custom Properties —— */
:root {
  --color-red: #C41E3A;
  --color-gold: #D4A017;
  --color-dark: #1A1A2E;
  --color-cream: #FFF8E7;
  --color-jade: #2E8B57;
  --color-text: #2c2c2c;
  --color-bg: #FFF8E7;
  --color-card-bg: #ffffff;
  --color-nav-bg: rgba(255,248,231,0.92);
  --color-footer-text: #ccc;
  --color-footer-bg: #1A1A2E;
  --shadow-card: 0 4px 24px rgba(0,0,0,0.06);
  --radius: 12px;
  --transition: 0.25s ease;
  --max-width: 1100px;
}

[data-theme="dark"] {
  --color-text: #e8e8e0;
  --color-bg: #1a1a24;
  --color-card-bg: #252535;
  --color-nav-bg: rgba(26,26,36,0.94);
  --color-footer-text: #ccc;
  --shadow-card: 0 4px 24px rgba(0,0,0,0.25);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  transition: background var(--transition), color var(--transition);
  min-height: 100vh;
}

::selection { background: var(--color-gold); color: var(--color-dark); }

h1, h2, h3 { font-family: 'Playfair Display', Georgia, 'Times New Roman', serif; color: var(--color-dark); }
[data-theme="dark"] h1,
[data-theme="dark"] h2,
[data-theme="dark"] h3 { color: var(--color-gold); }

a { color: var(--color-red); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-gold); }

/* —— Navbar —— */
.navbar {
  position: sticky; top: 0; z-index: 100;
  background: var(--color-nav-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 3px solid var(--color-gold);
}
.nav-inner {
  max-width: var(--max-width); margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.7rem 1.2rem;
}
.logo {
  font-family: 'Playfair Display', serif; font-size: 1.35rem;
  font-weight: 700; color: var(--color-red) !important;
}
.nav-right { display: flex; align-items: center; gap: 1rem; }

/* Language dropdown */
.lang-switch { position: relative; }
.lang-btn {
  background: none; border: 2px solid var(--color-gold); color: var(--color-text);
  padding: 0.4rem 0.85rem; border-radius: 6px; cursor: pointer;
  font-size: 0.9rem; font-family: inherit; transition: background var(--transition);
}
.lang-btn:hover { background: var(--color-gold); color: var(--color-dark); }
.lang-dropdown {
  display: none; position: absolute; top: 100%; right: 0;
  background: var(--color-card-bg); border: 1px solid var(--color-gold);
  border-radius: 8px; list-style: none; min-width: 160px;
  box-shadow: var(--shadow-card); z-index: 101; padding: 0.35rem 0;
}
.lang-switch:hover .lang-dropdown { display: block; }
.lang-dropdown li a {
  display: block; padding: 0.45rem 1rem; color: var(--color-text);
  font-size: 0.9rem; transition: background var(--transition);
}
.lang-dropdown li a:hover { background: var(--color-cream); color: var(--color-red); }

/* Theme toggle */
.theme-toggle {
  background: none; border: none; font-size: 1.4rem; cursor: pointer;
  padding: 0.2rem; transition: transform var(--transition);
}
.theme-toggle:hover { transform: rotate(20deg); }

/* —— Hero —— */
.hero {
  text-align: center; padding: 2.5rem 1.2rem 1.5rem;
  max-width: var(--max-width); margin: 0 auto;
}
.hero h1 {
  font-size: 2.4rem; color: var(--color-red); margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}
.hero h1::after {
  content: ''; display: block; width: 60px; height: 4px;
  background: var(--color-gold); margin: 0.6rem auto 0; border-radius: 2px;
}
.hero-sub {
  font-size: 1.1rem; max-width: 680px; margin: 0 auto 1.5rem;
  color: var(--color-text); opacity: 0.85;
}

/* —— Game Container —— */
.game-container {
  background: var(--color-card-bg); border-radius: var(--radius);
  box-shadow: var(--shadow-card); padding: 1.2rem;
  max-width: 760px; margin: 0 auto;
}
.game-controls-top {
  display: flex; gap: 0.5rem; flex-wrap: wrap; justify-content: center;
  margin-bottom: 0.8rem;
}
.game-controls-top button {
  background: var(--color-dark); color: var(--color-cream); border: none;
  padding: 0.5rem 1rem; border-radius: 6px; cursor: pointer;
  font-size: 0.9rem; font-family: inherit; transition: background var(--transition);
}
.game-controls-top button:hover { background: var(--color-red); }
.game-controls-top select {
  padding: 0.5rem 0.75rem; border: 2px solid var(--color-gold);
  border-radius: 6px; background: var(--color-card-bg); color: var(--color-text);
  font-family: inherit; font-size: 0.9rem;
}
canvas#mahjongBoard {
  display: block; border-radius: 8px;
  background: var(--color-dark); margin: 0 auto;
  max-width: 100%; height: auto;
}
.game-info-bar {
  display: flex; justify-content: space-around; flex-wrap: wrap;
  padding: 0.7rem 0.3rem; font-size: 0.95rem;
  color: var(--color-text);
}

/* —— Highlights —— */
.highlights {
  max-width: var(--max-width); margin: 2.5rem auto; padding: 0 1.2rem;
}
.highlights h2 {
  text-align: center; font-size: 1.8rem; margin-bottom: 1.8rem;
}
.highlights h2 + .highlights-grid { margin-top: -0.5rem; }
.highlights-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem; align-items: stretch;
}
.highlights-grid > div {
  background: var(--color-card-bg); border-left: 4px solid var(--color-gold);
  border-radius: 6px; padding: 1.3rem; box-shadow: var(--shadow-card);
  transition: transform var(--transition);
}
.highlights-grid > div:hover { transform: translateY(-3px); }
.highlights-grid > div h3 {
  font-size: 1.1rem; margin-bottom: 0.4rem; color: var(--color-red);
}
.highlights-grid > div p { font-size: 0.93rem; opacity: 0.85; line-height: 1.55; }

/* —— FAQ Accordion —— */
.faq {
  max-width: var(--max-width); margin: 2rem auto 3rem; padding: 0 1.2rem;
}
.faq h2 {
  text-align: center; font-size: 1.8rem; margin-bottom: 1.6rem;
}
details.faq-item {
  background: var(--color-card-bg); border-radius: 8px;
  margin-bottom: 0.7rem; box-shadow: 0 2px 8px rgba(0,0,0,0.04);
  overflow: hidden; transition: box-shadow var(--transition);
}
details.faq-item[open] { box-shadow: var(--shadow-card); }
details.faq-item summary {
  padding: 1rem 1.2rem; cursor: pointer; font-weight: 600;
  font-size: 1rem; list-style: none; display: flex;
  justify-content: space-between; align-items: center;
  color: var(--color-red);
}
details.faq-item summary::-webkit-details-marker { display: none; }
details.faq-item summary::after {
  content: '+'; font-size: 1.4rem; font-weight: 300;
  color: var(--color-gold); transition: transform var(--transition);
}
details.faq-item[open] summary::after { content: '−'; transform: rotate(180deg); }
details.faq-item .faq-answer { padding: 0 1.2rem 1.1rem; font-size: 0.95rem; line-height: 1.65; }

/* —— Footer —— */
footer {
  background: var(--color-footer-bg); color: var(--color-footer-text);
  text-align: center; padding: 1.8rem 1.2rem; margin-top: 1rem;
}
.footer-inner { max-width: var(--max-width); margin: 0 auto; font-size: 0.9rem; }
.footer-inner p { margin: 0.3rem 0; }
.footer-inner nav a {
  color: var(--color-gold); margin: 0 0.5rem; transition: color var(--transition);
}
.footer-inner nav a:hover { color: var(--color-cream); }
.footer-inner p + nav { margin: 0.6rem 0; }

/* —— Cookie Banner —— */
.cookie-banner {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 200;
  background: var(--color-dark); color: var(--color-cream);
  padding: 0.8rem 1.2rem; text-align: center; font-size: 0.9rem;
  transform: translateY(100%); transition: transform 0.4s ease;
  display: none;
}
.cookie-banner.visible { display: block; transform: translateY(0); }
.cookie-banner button {
  background: var(--color-gold); color: var(--color-dark); border: none;
  padding: 0.35rem 1rem; border-radius: 5px; margin-left: 0.6rem;
  cursor: pointer; font-weight: 600; font-family: inherit; font-size: 0.9rem;
}
.cookie-banner button:hover { background: var(--color-cream); }

/* —— Entrance Animation —— */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: translateY(0); }
}
.hero, .highlights, .faq {
  animation: fadeUp 0.6s ease both;
}
.highlights { animation-delay: 0.2s; }
.faq { animation-delay: 0.35s; }

/* —— About & Privacy Pages —— */
.page-content {
  max-width: 760px; margin: 2rem auto; padding: 0 1.5rem;
}
.page-content h1 { font-size: 2rem; margin-bottom: 1.2rem; color: var(--color-red); }
.page-content h2 { font-size: 1.4rem; margin: 1.5rem 0 0.7rem; color: var(--color-dark); }
.page-content p { margin-bottom: 1rem; line-height: 1.75; }
.page-content ul { padding-left: 1.5rem; margin-bottom: 1rem; }
.page-content ul li { margin-bottom: 0.4rem; }
.page-content .back-home {
  display: inline-block; margin-top: 1.5rem; padding: 0.6rem 1.2rem;
  background: var(--color-red); color: #fff; border-radius: 6px;
  font-weight: 600;
}
.page-content .back-home:hover { background: var(--color-gold); color: var(--color-dark); }

/* —— 404 —— */
.not-found { text-align: center; padding: 5rem 1.5rem; }
.not-found h1 { font-size: 4rem; color: var(--color-red); margin-bottom: 0.5rem; }
.not-found p { font-size: 1.2rem; margin-bottom: 1.5rem; }
.not-found a {
  display: inline-block; padding: 0.6rem 1.5rem;
  background: var(--color-red); color: #fff; border-radius: 6px;
  font-weight: 600; font-size: 1rem;
}
.not-found a:hover { background: var(--color-gold); color: var(--color-dark); }

/* —— Responsive —— */
@media (max-width: 640px) {
  .highlights-grid { grid-template-columns: repeat(2, 1fr); }
  .hero h1 { font-size: 1.8rem; }
  .game-controls-top { gap: 0.35rem; }
  .game-controls-top button,
  .game-controls-top select { font-size: 0.82rem; padding: 0.4rem 0.7rem; }
  .logo { font-size: 1.1rem; }
}

@media (max-width: 480px) {
  .highlights-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 1.5rem; }
  .nav-inner { flex-direction: column; gap: 0.5rem; }
  .game-info-bar { font-size: 0.82rem; gap: 0.5rem; }
}