* { box-sizing: border-box; }

:root {
  --panel: rgba(255, 252, 244, 0.08);
  --panel-strong: rgba(255, 252, 244, 0.14);
  --text: #f7f0df;
  --muted: #bfb49d;
  --line: rgba(255, 255, 255, 0.15);
  --gold: #d7b56d;
}

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--text);
  font-family: Inter, "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  background:
    radial-gradient(circle at 20% 10%, rgba(215, 181, 109, 0.16), transparent 24rem),
    radial-gradient(circle at 84% 22%, rgba(255, 255, 255, 0.08), transparent 20rem),
    linear-gradient(135deg, #0b0b0a 0%, #171613 54%, #0e0d0c 100%);
}

a { color: inherit; text-decoration: none; }
button, select { font: inherit; }

.site-shell {
  width: min(1780px, 100%);
  margin: 0 auto;
  padding: 20px;
}

.topbar {
  position: sticky;
  top: 12px;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: rgba(16, 16, 15, 0.78);
  backdrop-filter: blur(18px);
}

.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark {
  width: 42px; height: 42px; border-radius: 50%;
  display: grid; place-items: center;
  color: #0f0f0f; font-weight: 900;
  background: linear-gradient(135deg, #f8edd2, var(--gold));
  box-shadow: 0 0 30px rgba(215, 181, 109, 0.25);
}
.brand-title { font-weight: 800; letter-spacing: 0.04em; }
.brand-subtitle { margin-top: 2px; color: var(--muted); font-size: 12px; }

.nav { display: flex; align-items: center; gap: 18px; color: var(--muted); font-size: 14px; }
.nav a:hover { color: var(--text); }
.nav-pill {
  padding: 8px 14px;
  border: 1px solid rgba(215,181,109,.45);
  border-radius: 999px;
  color: var(--text);
  background: rgba(215,181,109,.1);
}

.hero {
  min-height: 680px;
  display: grid;
  grid-template-columns: 1fr 0.92fr;
  align-items: center;
  gap: 48px;
  padding: 70px 10px 36px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--gold);
  font-size: 13px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-size: clamp(44px, 6vw, 86px);
  line-height: 1.04;
  letter-spacing: -0.05em;
}

.hero-desc {
  max-width: 660px;
  margin: 24px 0 0;
  color: var(--muted);
  line-height: 1.9;
  font-size: 17px;
}

.hero-actions, .button-row { display: flex; gap: 12px; flex-wrap: wrap; }
.hero-actions { margin-top: 34px; }

.btn {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 12px 20px;
  color: var(--text);
  background: var(--panel);
  cursor: pointer;
  transition: transform 0.16s ease, border-color 0.16s ease, background 0.16s ease;
}
.btn:hover { transform: translateY(-1px); border-color: rgba(215, 181, 109, 0.7); background: var(--panel-strong); }
.btn.primary { color: #16130d; border-color: transparent; background: linear-gradient(135deg, #fff2ce, var(--gold)); font-weight: 800; }
.btn.ghost { background: rgba(255, 255, 255, 0.04); }
.btn.small { padding: 9px 14px; font-size: 14px; }
.back-link { display: inline-block; margin-top: 16px; color: var(--gold); font-size: 14px; }

.ip-stage {
  position: relative;
  min-height: 480px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  place-items: center;
  gap: 18px;
}
.halo {
  position: absolute; inset: 10%; border-radius: 50%;
  background:
    linear-gradient(90deg, transparent 48%, rgba(215,181,109,.18) 49%, rgba(215,181,109,.18) 51%, transparent 52%),
    linear-gradient(0deg, transparent 48%, rgba(215,181,109,.12) 49%, rgba(215,181,109,.12) 51%, transparent 52%);
  opacity: 0.8;
}
.ip-card {
  position: relative;
  width: min(270px, 100%);
  min-height: 340px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 32px;
  background: rgba(255, 255, 255, 0.07);
  box-shadow: 0 24px 90px rgba(0,0,0,.3);
}
.black-ip { transform: translateY(26px); }
.white-ip { transform: translateY(-28px); }
.ip-avatar { height: 150px; display: grid; place-items: center; }
.ip-face { position: relative; width: 118px; height: 118px; border-radius: 50%; }
.black-face {
  background:
    radial-gradient(circle at 35% 38%, rgba(255,255,255,.16), transparent 12px),
    radial-gradient(circle at 64% 38%, rgba(255,255,255,.16), transparent 12px),
    linear-gradient(145deg, #2b2b2b, #030303);
  border: 2px solid #2f2b23;
  box-shadow: inset -10px -16px 24px rgba(0,0,0,.75), 0 20px 45px rgba(0,0,0,.45);
}
.white-face {
  background:
    radial-gradient(circle at 35% 38%, rgba(0,0,0,.12), transparent 12px),
    radial-gradient(circle at 64% 38%, rgba(0,0,0,.12), transparent 12px),
    linear-gradient(145deg, #fffdf5, #d8cfbd);
  border: 2px solid #fbefd0;
  box-shadow: inset -10px -16px 24px rgba(137,108,57,.24), 0 20px 45px rgba(255,255,255,.1);
}
.ip-face::after {
  content: "";
  position: absolute;
  left: 33%; top: 62%;
  width: 34%; height: 8px;
  border-radius: 99px;
  background: currentColor;
  opacity: 0.28;
}
.ip-card h2 { margin: 10px 0 8px; font-size: 28px; }
.ip-card p { margin: 0; color: var(--muted); line-height: 1.75; }

.game-section, .culture-section, .feature-section { padding: 64px 0; }
.game-section.compact { padding-top: 40px; }

.section-title {
  margin: 0 auto 24px;
  max-width: 920px;
  text-align: center;
}
.section-title h1, .section-title h2 {
  margin: 0 0 10px;
  font-size: clamp(30px, 4vw, 52px);
  letter-spacing: -0.04em;
}
.section-title p:last-child { color: var(--muted); line-height: 1.8; }

.game-layout {
  display: grid;
  grid-template-columns: 280px minmax(820px, 1080px) 320px;
  gap: 18px;
  align-items: start;
  justify-content: center;
}

.panel, .board-wrap, .culture-grid article, .feature-grid article, .modal-card {
  border: 1px solid var(--line);
  border-radius: 28px;
  background: rgba(255, 255, 255, 0.07);
  box-shadow: 0 24px 80px rgba(0,0,0,.22);
}
.panel { padding: 18px; }

.player-card {
  display: flex;
  gap: 12px;
  align-items: center;
  padding: 14px;
  margin-bottom: 12px;
  border: 1px solid transparent;
  border-radius: 20px;
  background: rgba(0,0,0,.16);
}
.player-card.active { border-color: rgba(215,181,109,.65); background: rgba(215,181,109,.1); }
.player-card strong, .player-card span { display: block; }
.player-card span { margin-top: 4px; color: var(--muted); font-size: 13px; }

.stone-icon { width: 34px; height: 34px; border-radius: 50%; flex: 0 0 auto; }
.stone-icon.black { background: radial-gradient(circle at 35% 28%, #444, #040404 70%); box-shadow: inset -6px -8px 14px rgba(0,0,0,.8); }
.stone-icon.white { background: radial-gradient(circle at 35% 28%, #fff, #ddd1b6 75%); box-shadow: inset -4px -8px 14px rgba(126,93,45,.18); }

.stat-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin: 18px 0; }
.stat-grid div { padding: 14px; border-radius: 18px; background: rgba(0,0,0,.18); }
.stat-grid span { display: block; color: var(--muted); font-size: 12px; }
.stat-grid strong { display: block; margin-top: 5px; font-size: 22px; }

.control-group { margin: 18px 0; }
.control-group label { display: block; margin-bottom: 8px; color: var(--muted); font-size: 13px; }
select {
  width: 100%;
  padding: 11px 12px;
  border: 1px solid var(--line);
  border-radius: 16px;
  color: var(--text);
  background: #161512;
}
.note { margin: 18px 0 0; color: var(--muted); font-size: 13px; line-height: 1.75; }

.board-wrap {
  padding: 18px;
  background:
    radial-gradient(circle at 50% 15%, rgba(215,181,109,.18), transparent 26rem),
    rgba(255,255,255,.06);
}

.board-header, .board-footer {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: 13px;
}
.board-header { margin-bottom: 14px; }
.board-footer { margin-top: 14px; }

.canvas-board-frame {
  width: min(100%, 1040px);
  aspect-ratio: 1 / 1;
  margin: 0 auto;
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 24px 80px rgba(0,0,0,.28);
}

.go-board {
  display: block;
  width: 100%;
  height: 100%;
  cursor: crosshair;
  user-select: none;
  touch-action: manipulation;
}

.dialogue-speaker { display: flex; align-items: center; gap: 12px; }
.speaker-avatar { width: 50px; height: 50px; border-radius: 50%; background: radial-gradient(circle at 35% 28%, #555, #050505 72%); }
.speaker-avatar.white { background: radial-gradient(circle at 35% 28%, #fff, #d8cbb1 76%); }
.dialogue-speaker span { display: block; margin-top: 4px; color: var(--muted); font-size: 12px; }

.dialogue-box {
  margin-top: 16px;
  padding: 18px;
  min-height: 128px;
  border-radius: 22px;
  background: rgba(0,0,0,.18);
  line-height: 1.85;
}
.dialogue-box p { margin: 0; }

.tip-card {
  margin-top: 14px;
  padding: 16px;
  border: 1px solid rgba(215,181,109,.28);
  border-radius: 22px;
  background: rgba(215,181,109,.09);
}
.tip-card h3, .log-box h3 { margin: 0 0 8px; }
.tip-card p { margin: 0; color: var(--muted); line-height: 1.75; }

.log-box { margin-top: 14px; }
.log-box ol {
  max-height: 220px;
  overflow: auto;
  margin: 0;
  padding-left: 22px;
  color: var(--muted);
  line-height: 1.8;
  font-size: 13px;
}

.culture-grid, .feature-grid { display: grid; gap: 16px; }
.culture-grid { grid-template-columns: repeat(4, 1fr); }
.feature-grid { grid-template-columns: repeat(3, 1fr); }
.culture-grid article, .feature-grid article { padding: 24px; }
.culture-grid span, .feature-grid span { color: var(--gold); font-weight: 800; }
.culture-grid h3, .feature-grid h3 { margin: 18px 0 10px; font-size: 24px; }
.culture-grid p, .feature-grid p { margin: 0; color: var(--muted); line-height: 1.8; }

footer {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 24px 4px 10px;
  color: var(--muted);
  font-size: 13px;
}

.modal {
  position: fixed;
  inset: 0;
  display: none;
  place-items: center;
  padding: 20px;
  background: rgba(0,0,0,.64);
  z-index: 99;
}
.modal.show { display: grid; }
.modal-card {
  position: relative;
  width: min(720px, 100%);
  padding: 32px;
  background: rgba(24,23,20,.96);
}
.modal-card p, .modal-card li { color: var(--muted); line-height: 1.85; }
.modal-close {
  position: absolute;
  right: 18px; top: 14px;
  width: 36px; height: 36px;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--text);
  background: rgba(255,255,255,.08);
  cursor: pointer;
}

@media (max-width: 1500px) {
  .game-layout { grid-template-columns: 1fr; }
  .canvas-board-frame { width: min(94vw, 1040px); }
}

@media (max-width: 1180px) {
  .culture-grid, .feature-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 780px) {
  .site-shell { padding: 12px; }
  .topbar { position: static; align-items: flex-start; flex-direction: column; }
  .nav { width: 100%; justify-content: space-between; flex-wrap: wrap; gap: 10px; }
  .hero { grid-template-columns: 1fr; padding-top: 42px; }
  .ip-stage { grid-template-columns: 1fr; }
  .black-ip, .white-ip { transform: none; }
  .culture-grid, .feature-grid { grid-template-columns: 1fr; }
  .canvas-board-frame { width: 94vw; border-radius: 14px; }
  footer { flex-direction: column; }
}