:root {
  --bg-deep: #54412a;
  --bg-mid: #8a6942;
  --panel: rgba(247, 244, 236, 0.96);
  --ink: #36281a;
  --muted: #726253;
  --shadow: 0 22px 48px rgba(3, 11, 24, 0.28);
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: "Avenir Next", "Trebuchet MS", "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 18% 10%, rgba(248, 224, 166, 0.18), transparent 22%),
    radial-gradient(circle at 84% 12%, rgba(187, 147, 95, 0.18), transparent 22%),
    linear-gradient(155deg, var(--bg-deep), var(--bg-mid));
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    linear-gradient(120deg, rgba(255,255,255,0.03), transparent 28%),
    linear-gradient(rgba(255,255,255,0.02) 0, rgba(255,255,255,0.02) 1px, transparent 1px, transparent 72px),
    linear-gradient(90deg, rgba(255,255,255,0.02) 0, rgba(255,255,255,0.02) 1px, transparent 1px, transparent 72px);
  opacity: .3;
  pointer-events: none;
}

.game2048-app { width: min(1180px, calc(100% - 28px)); margin: 0 auto; padding: 24px 0 40px; }
.game2048-topbar,.game2048-controls-panel,.game2048-board-panel,.rules-card,.result-overlay-card { border: 1px solid rgba(255,255,255,.12); background: var(--panel); box-shadow: var(--shadow); backdrop-filter: blur(14px); }
.game2048-topbar { display: flex; justify-content: space-between; align-items: center; gap: 16px; padding: 14px 18px; border-radius: 24px; }
.game2048-topbar-actions { display: flex; align-items: center; gap: 12px; }
.game2048-brand { display: inline-flex; align-items: center; gap: 14px; color: var(--ink); text-decoration: none; }
.game2048-brand-mark { display: grid; place-items: center; width: 44px; height: 44px; border-radius: 14px; background: linear-gradient(135deg, #f7f0de, #c79957); color: #36281a; font-weight: 900; }
.game2048-brand-copy { display: grid; gap: 2px; }
.game2048-brand-copy strong { font-size: 1.04rem; }
.game2048-brand-copy span { color: var(--muted); font-size: .92rem; }
.game2048-return,.game2048-support,.action-button { display: inline-flex; justify-content: center; align-items: center; min-height: 46px; padding: 0 18px; border-radius: 999px; border: 1px solid rgba(21,34,55,.12); background: linear-gradient(145deg,#f8fbff,#f0e4d0); color: var(--ink); font: inherit; font-weight: 800; text-decoration: none; cursor: pointer; transition: transform .14s ease, opacity .14s ease; }
.game2048-support { background: linear-gradient(145deg,#ffdc42,#f0b90a); color: #24150f; }
.action-button.primary { background: linear-gradient(145deg,#f2dfbb,#d39b45); color: #36281a; }
.game2048-return:hover,.game2048-support:hover,.action-button:hover,.game2048-return:focus-visible,.game2048-support:focus-visible,.action-button:focus-visible { transform: translateY(-1px); }
.action-button:disabled { opacity: .45; cursor: not-allowed; transform: none; }

.game2048-hero { display: grid; grid-template-columns: minmax(0,.9fr) minmax(360px,1.1fr); gap: 20px; align-items: start; padding: 28px 0 18px; }
.eyebrow { margin: 0 0 12px; color: rgba(255,255,255,.76); font-size: .76rem; font-weight: 800; letter-spacing: .16em; text-transform: uppercase; }
.eyebrow.dark { color: #7a684d; }
.game2048-copy h1,.status-copy h2,.rules-card h2,.result-overlay-card h2 { font-family: "Iowan Old Style","Palatino Linotype","Book Antiqua",serif; }
.game2048-copy h1 { margin: 0 0 14px; max-width: 9ch; color: #fff8ec; font-size: clamp(2.4rem,5vw,4.5rem); line-height: .96; }
.game2048-copy p:last-child { margin: 0; max-width: 60ch; color: rgba(239,245,255,.86); line-height: 1.65; }
.game2048-controls-panel { border-radius: 30px; padding: 22px; }
.status-copy h2 { margin: 0; font-size: clamp(1.24rem,2.4vw,1.78rem); line-height: 1.12; }
.notice-text { margin: 10px 0 0; color: var(--muted); line-height: 1.55; }
.metric-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 12px; margin-top: 18px; }
.metric-card { display: grid; gap: 4px; padding: 15px 16px; border-radius: 22px; background: linear-gradient(145deg,#f5efe3,#eadbbf); }
.metric-card span { color: var(--muted); font-size: .82rem; font-weight: 700; }
.metric-card strong { font-size: clamp(1.2rem,2.6vw,1.7rem); }
.action-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 18px; }

.game2048-board-panel { border-radius: 30px; padding: 18px; }
.game2048-board {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  padding: 12px;
  border-radius: 26px;
  background: linear-gradient(145deg,#b79d7f,#9d815f);
}

.tile {
  aspect-ratio: 1;
  border-radius: 18px;
  background: rgba(255,255,255,.15);
  display: grid;
  place-items: center;
  font-weight: 900;
  font-size: clamp(1.3rem, 4vw, 2.2rem);
  color: #fff8ec;
}

.tile.has-value { background: linear-gradient(145deg,#eee4da,#e0d1bf); color: #5d4d3d; }
.tile.tile-4 { background: linear-gradient(145deg,#f0ddc0,#e6cb96); }
.tile.tile-8 { background: linear-gradient(145deg,#f2c992,#e3a655); color: #fff8ec; }
.tile.tile-16 { background: linear-gradient(145deg,#efb27c,#db8846); color: #fff8ec; }
.tile.tile-32 { background: linear-gradient(145deg,#e9936f,#cf6147); color: #fff8ec; }
.tile.tile-64 { background: linear-gradient(145deg,#de6f58,#b54d3d); color: #fff8ec; }
.tile.tile-128,.tile.tile-256,.tile.tile-512,.tile.tile-1024,.tile.tile-2048 { background: linear-gradient(145deg,#f3dd91,#d39b45); color: #523412; }

.result-overlay { position: fixed; inset: 0; display: grid; place-items: center; padding: 20px; background: rgba(6,16,27,.62); z-index: 60; }
.result-overlay[hidden] { display: none !important; }
.result-overlay-card { width: min(460px,100%); border-radius: 28px; padding: 24px; text-align: center; }
.overlay-kicker { margin: 0 0 12px; color: #8a6b3d; font-size: .78rem; font-weight: 800; letter-spacing: .16em; text-transform: uppercase; }
.result-overlay-card h2 { margin: 0 0 12px; font-size: clamp(1.8rem,4vw,2.4rem); }
.overlay-message,.overlay-details { margin: 0 0 14px; color: var(--muted); line-height: 1.6; }

.game2048-seo { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 18px; margin-top: 24px; }
.rules-card { border-radius: 26px; padding: 18px 20px; }
.rules-card h2 { margin: 0 0 14px; font-size: 1.24rem; }
.rules-card p,.rules-card li,.faq-list dd { color: var(--muted); line-height: 1.65; }
.rules-card ol,.rules-card ul { margin: 0; padding-left: 20px; }
.faq-list { margin: 0; display: grid; gap: 10px; }
.faq-list dt { font-weight: 800; }
.faq-list dd { margin: 0; }

@media (max-width: 1080px) {
  .game2048-hero,
  .game2048-seo { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  .game2048-app { width: min(100% - 18px,100%); padding-top: 14px; }
  .game2048-topbar { flex-direction: column; align-items: stretch; }
  .game2048-topbar-actions,.action-row { flex-direction: column; width: 100%; }
  .metric-grid { grid-template-columns: 1fr; }
}