/* ==========================================================================
   粒绘拼豆 · 官网样式
   深色底 + 拼豆色（金 / 蓝 / 红 / 绿）+ 像素与玻璃质感
   ========================================================================== */

:root {
  --bg: #08090f;
  --bg-2: #0d0f18;
  --panel: rgba(255, 255, 255, 0.045);
  --panel-2: rgba(255, 255, 255, 0.07);
  --line: rgba(255, 255, 255, 0.09);
  --line-2: rgba(255, 255, 255, 0.16);
  --text: #eef1f8;
  --muted: #99a1b8;
  --muted-2: #6e768d;

  /* 拼豆品牌色 */
  --gold: #ffd24a;
  --gold-deep: #f2a900;
  --blue: #5a83ff;
  --blue-deep: #2563eb;
  --red: #ff5f63;
  --green: #2fd18b;

  --radius: 18px;
  --radius-lg: 26px;
  --wrap: 1200px;
  --shadow: 0 24px 60px -28px rgba(0, 0, 0, 0.85);
  --font: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei UI", "Microsoft YaHei",
    system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 88px; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  letter-spacing: 0.01em;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, h4 { line-height: 1.22; margin: 0; letter-spacing: -0.01em; }
p { margin: 0; }
ul { margin: 0; padding: 0; list-style: none; }

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }
.wrap.narrow { max-width: 860px; }

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 999;
  background: var(--gold); color: #111; padding: 10px 16px; border-radius: 0 0 10px 0;
}
.skip-link:focus { left: 0; }

/* ── 背景特效 ───────────────────────────────────────────── */
.bg-fx { position: fixed; inset: 0; z-index: -1; overflow: hidden; pointer-events: none; }
.bg-fx .veil {
  position: absolute; inset: 0;
  background: radial-gradient(1200px 700px at 50% -10%, rgba(90, 131, 255, 0.16), transparent 60%),
    radial-gradient(900px 600px at 100% 20%, rgba(255, 210, 74, 0.1), transparent 60%),
    radial-gradient(900px 700px at 0% 80%, rgba(255, 95, 99, 0.09), transparent 60%);
}
.bg-fx .grid {
  position: absolute; inset: 0;
  background-image: linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: radial-gradient(900px 620px at 50% 0%, #000 5%, transparent 78%);
  -webkit-mask-image: radial-gradient(900px 620px at 50% 0%, #000 5%, transparent 78%);
}
.blob { position: absolute; border-radius: 50%; filter: blur(90px); opacity: 0.5; }
.blob-gold { width: 420px; height: 420px; left: -120px; top: 6%; background: rgba(255, 210, 74, 0.4); animation: drift 22s ease-in-out infinite; }
.blob-blue { width: 500px; height: 500px; right: -160px; top: 22%; background: rgba(90, 131, 255, 0.42); animation: drift 26s ease-in-out infinite reverse; }
.blob-red { width: 380px; height: 380px; left: 30%; top: 74%; background: rgba(255, 95, 99, 0.3); animation: drift 30s ease-in-out infinite; }
@keyframes drift {
  0%, 100% { transform: translate3d(0, 0, 0) scale(1); }
  50% { transform: translate3d(40px, -50px, 0) scale(1.12); }
}

/* ── 通用组件 ───────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 13px 24px; border-radius: 999px; border: 1px solid transparent;
  font-size: 15px; font-weight: 600; cursor: pointer; white-space: nowrap;
  transition: transform 0.18s ease, box-shadow 0.25s ease, background 0.25s ease, border-color 0.25s ease;
  font-family: inherit;
}
.btn svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.btn-primary {
  background: linear-gradient(135deg, var(--gold) 0%, var(--gold-deep) 100%);
  color: #17130a; box-shadow: 0 14px 34px -14px rgba(255, 190, 60, 0.75);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 20px 42px -14px rgba(255, 190, 60, 0.9); }
.btn-primary svg { fill: currentColor; stroke: none; }
.btn-ghost { background: var(--panel); border-color: var(--line-2); color: var(--text); backdrop-filter: blur(8px); }
.btn-ghost:hover { background: var(--panel-2); border-color: rgba(255, 255, 255, 0.3); transform: translateY(-2px); }
.btn-sm { padding: 9px 18px; font-size: 14px; }

.pill {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 7px 15px; border-radius: 999px;
  background: var(--panel); border: 1px solid var(--line);
  font-size: 13px; color: #c9d0e2; margin: 0 0 22px;
}
.pill .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--green); box-shadow: 0 0 0 4px rgba(47, 209, 139, 0.18); }
.bead-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--gold); box-shadow: 0 0 0 4px rgba(255, 210, 74, 0.16); flex: none; }

.grad {
  background: linear-gradient(100deg, var(--gold) 0%, #ffe9a8 35%, var(--blue) 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}

.eyebrow {
  font-size: 13px; font-weight: 700; letter-spacing: 0.22em; text-transform: uppercase;
  color: var(--gold); margin: 0 0 14px;
}

/* ── 导航 ───────────────────────────────────────────────── */
.nav {
  position: sticky; top: 0; z-index: 60;
  background: rgba(8, 9, 15, 0.55);
  backdrop-filter: blur(14px) saturate(150%);
  border-bottom: 1px solid transparent;
  transition: background 0.3s ease, border-color 0.3s ease;
}
.nav.scrolled { background: rgba(8, 9, 15, 0.86); border-bottom-color: var(--line); }
.nav-inner { display: flex; align-items: center; gap: 18px; height: 74px; }

.brand { display: flex; align-items: center; gap: 12px; flex: none; }
.brand-mark {
  width: 46px; height: 46px; border-radius: 50%; flex: none;
  background: #fff; display: grid; place-items: center;
  box-shadow: 0 0 0 3px rgba(255, 210, 74, 0.22), 0 8px 22px -10px rgba(0, 0, 0, 0.9);
  overflow: hidden;
}
.brand-mark img { width: 100%; height: 100%; }
.brand-mark.sm { width: 38px; height: 38px; }
.brand-text { display: flex; flex-direction: column; line-height: 1.25; }
.brand-text strong { font-size: 19px; letter-spacing: 0.04em; }
.brand-text em { font-size: 11.5px; color: var(--muted-2); font-style: normal; letter-spacing: 0.06em; }

.nav-links { display: flex; gap: 4px; margin-left: auto; }
.nav-links a {
  padding: 9px 15px; border-radius: 999px; font-size: 14.5px; color: #c6ccdd;
  transition: color 0.2s ease, background 0.2s ease;
}
.nav-links a:hover { color: #fff; background: var(--panel); }
.nav-actions { display: flex; align-items: center; gap: 10px; margin-left: auto; }

.nav-burger { display: none; width: 42px; height: 42px; border-radius: 12px; background: var(--panel); border: 1px solid var(--line); cursor: pointer; padding: 0; }
.nav-burger span { display: block; width: 18px; height: 2px; margin: 3px auto; background: var(--text); border-radius: 2px; transition: transform 0.25s ease, opacity 0.25s ease; }
.nav-burger[aria-expanded="true"] span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-burger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-burger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

/* ── 首屏 ───────────────────────────────────────────────── */
.hero { padding: 76px 0 0; position: relative; }
.hero-inner { display: grid; grid-template-columns: 1.05fr 1fr; gap: 56px; align-items: center; }
.hero h1 { font-size: clamp(40px, 5.6vw, 68px); font-weight: 800; }
.hero .lede { margin: 22px 0 0; font-size: 17.5px; color: var(--muted); max-width: 540px; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 34px; }

.hero-stats { display: grid; grid-template-columns: repeat(4, auto); gap: 34px; margin: 48px 0 0; }
.hero-stats dt { font-size: 30px; font-weight: 800; font-family: var(--mono); color: #fff; }
.hero-stats dd { margin: 2px 0 0; font-size: 13px; color: var(--muted-2); }

.hero-art { position: relative; }
.art-card {
  position: relative; border-radius: var(--radius-lg); overflow: hidden;
  border: 1px solid var(--line-2); background: #12141f;
  box-shadow: var(--shadow); transform: perspective(1400px) rotateY(-7deg) rotateX(3deg);
  transition: transform 0.6s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.art-card:hover { transform: perspective(1400px) rotateY(0deg) rotateX(0deg); }
.art-card img { width: 100%; height: auto; }
.art-badge {
  position: absolute; left: 14px; bottom: 14px; right: 14px;
  display: flex; align-items: center; gap: 10px;
  padding: 11px 16px; border-radius: 14px; font-size: 13px; color: #dfe4f2;
  background: rgba(10, 12, 20, 0.78); border: 1px solid var(--line-2);
  backdrop-filter: blur(10px);
}
.art-badge .bar { flex: 1; height: 5px; border-radius: 99px; background: rgba(255, 255, 255, 0.14); overflow: hidden; }
.art-badge .bar i { display: block; height: 100%; width: 40%; border-radius: 99px; background: linear-gradient(90deg, var(--gold), var(--blue)); animation: sweep 3.2s ease-in-out infinite; }
@keyframes sweep { 0%, 100% { width: 28%; } 50% { width: 88%; } }

.float-chip {
  position: absolute; display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 16px; border-radius: 999px; font-size: 13px; font-weight: 600;
  background: rgba(12, 14, 22, 0.9); border: 1px solid var(--line-2); color: #e6eaf6;
  backdrop-filter: blur(10px); box-shadow: 0 16px 30px -18px rgba(0, 0, 0, 0.95);
}
.chip-a { left: -26px; top: 22%; animation: float 6s ease-in-out infinite; }
.chip-b { right: -18px; bottom: 16%; animation: float 7.5s ease-in-out infinite reverse; }
.chip-c { right: -22px; top: -18px; animation: float 6.8s ease-in-out infinite; }
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-12px); } }
.sw { width: 10px; height: 10px; border-radius: 3px; background: var(--c, #fff); }

.pixel-field { position: absolute; inset: -30px -20px; z-index: -1; opacity: 0.5; }

.brand-strip { margin-top: 76px; padding: 20px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); overflow: hidden; }
.marquee { display: flex; gap: 54px; width: max-content; animation: marquee 34s linear infinite; }
.marquee span { font-size: 17px; font-weight: 700; letter-spacing: 0.16em; color: rgba(255, 255, 255, 0.26); white-space: nowrap; }
@keyframes marquee { from { transform: translateX(0); } to { transform: translateX(-50%); } }

/* ── 区块 ───────────────────────────────────────────────── */
.section { padding: 104px 0; position: relative; }
.section-alt { background: linear-gradient(180deg, rgba(255, 255, 255, 0.022), rgba(255, 255, 255, 0)); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.sec-head { max-width: 720px; margin: 0 auto 58px; text-align: center; }
.sec-head.left { margin-left: 0; text-align: left; }
.sec-head h2 { font-size: clamp(28px, 3.6vw, 42px); font-weight: 800; }
.sec-head .sub { margin-top: 16px; color: var(--muted); font-size: 16.5px; }

/* ── 功能卡片 ───────────────────────────────────────────── */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.card {
  position: relative; padding: 28px; border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.018));
  border: 1px solid var(--line);
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
  overflow: hidden;
}
.card::after {
  content: ""; position: absolute; inset: 0; border-radius: inherit; pointer-events: none;
  background: radial-gradient(340px 180px at 20% 0%, rgba(255, 210, 74, 0.1), transparent 70%);
  opacity: 0; transition: opacity 0.35s ease;
}
.card:hover { transform: translateY(-5px); border-color: var(--line-2); box-shadow: 0 26px 50px -30px rgba(0, 0, 0, 0.95); }
.card:hover::after { opacity: 1; }
.card-lg { grid-column: span 2; }
.card h3 { font-size: 19.5px; margin: 16px 0 10px; }
.card p { color: var(--muted); font-size: 15px; }
.ic {
  width: 46px; height: 46px; border-radius: 14px; display: grid; place-items: center;
  border: 1px solid var(--line-2);
}
.ic svg { width: 24px; height: 24px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.ic-gold { background: rgba(255, 210, 74, 0.12); color: var(--gold); }
.ic-blue { background: rgba(90, 131, 255, 0.13); color: var(--blue); }
.ic-red { background: rgba(255, 95, 99, 0.12); color: var(--red); }
.ic-green { background: rgba(47, 209, 139, 0.12); color: var(--green); }

.ticks { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-top: 16px; }
.ticks li { position: relative; padding-left: 20px; font-size: 13.5px; color: #b6bed2; }
.ticks li::before { content: ""; position: absolute; left: 0; top: 8px; width: 7px; height: 7px; border-radius: 2px; background: var(--gold); }

/* ── 流程 ───────────────────────────────────────────────── */
.flow-inner { display: block; }
.flow { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; counter-reset: f; }
.flow li {
  padding: 26px 24px; border-radius: var(--radius);
  background: var(--panel); border: 1px solid var(--line); position: relative;
}
.flow-num { font-family: var(--mono); font-size: 13px; color: var(--gold); letter-spacing: 0.16em; }
.flow h3 { font-size: 18px; margin: 12px 0 8px; }
.flow p { color: var(--muted); font-size: 14.5px; }

.flow-demo { display: grid; grid-template-columns: 1fr 60px 1fr; align-items: center; gap: 12px; margin-top: 44px; }
.demo-pane { position: relative; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--line-2); background: #101220; }
.demo-pane img { width: 100%; aspect-ratio: 4 / 3.2; object-fit: cover; }
.demo-tag {
  position: absolute; left: 12px; top: 12px; padding: 5px 12px; border-radius: 999px;
  font-size: 12px; background: rgba(8, 10, 16, 0.8); border: 1px solid var(--line-2); backdrop-filter: blur(8px);
}
.tag-hi { color: #17130a; background: var(--gold); border-color: transparent; font-weight: 700; }
.demo-arrow { display: grid; place-items: center; color: var(--muted-2); }
.demo-arrow svg { width: 30px; height: 30px; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.pixel-grid { display: grid; aspect-ratio: 4 / 3.2; padding: 8px; gap: 2px; background: #0b0d16; width: 100%; }
.pixel-grid i { border-radius: 2px; transition: background 0.4s ease; }

/* ── 色卡 ───────────────────────────────────────────────── */
.brands { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin-bottom: 40px; }
.brands .chip {
  padding: 9px 18px; border-radius: 999px; font-size: 14px; font-weight: 600;
  background: var(--panel); border: 1px solid var(--line); color: #cfd5e6;
  transition: transform 0.22s ease, color 0.22s ease, border-color 0.22s ease;
}
.brands .chip:hover { transform: translateY(-3px); color: #fff; border-color: var(--gold); }

.mosaic {
  display: grid; grid-template-columns: repeat(28, 1fr); gap: 6px;
  padding: 22px; border-radius: var(--radius-lg);
  background: var(--panel); border: 1px solid var(--line);
}
.mosaic i { aspect-ratio: 1; border-radius: 50%; background: var(--c); box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.14); }

.palette-notes { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 26px; }
.palette-notes p { padding: 18px 22px; border-radius: var(--radius); background: var(--panel); border: 1px solid var(--line); color: var(--muted); font-size: 15px; }
.palette-notes strong { color: var(--text); }

/* ── 广场 ───────────────────────────────────────────────── */
.community-inner { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 60px; align-items: center; }
.feature-list { display: grid; gap: 18px; margin-top: 32px; }
.feature-list li { display: flex; gap: 16px; align-items: flex-start; }
.fl-ic {
  flex: none; width: 40px; height: 40px; border-radius: 12px; display: grid; place-items: center;
  background: rgba(255, 210, 74, 0.12); color: var(--gold); font-size: 17px; border: 1px solid var(--line-2);
}
.feature-list strong { display: block; font-size: 16.5px; margin-bottom: 2px; }
.feature-list p { color: var(--muted); font-size: 14.5px; }

.community-art { position: relative; }
.glass-card {
  border-radius: var(--radius-lg); padding: 20px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.02));
  border: 1px solid var(--line-2); box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
}
.gc-head { display: flex; align-items: center; gap: 10px; font-size: 14px; color: #cdd4e6; margin-bottom: 16px; }
.gc-body { display: flex; gap: 16px; align-items: center; }
.gc-thumb { width: 108px; height: 108px; border-radius: 16px; flex: none; background: #0b0d16; border: 1px solid var(--line-2); overflow: hidden; }
.gc-thumb img { width: 100%; height: 100%; object-fit: cover; }
.gc-meta { display: flex; flex-direction: column; gap: 7px; }
.gc-meta strong { font-size: 20px; }
.gc-author { font-size: 13px; color: var(--muted); display: inline-flex; align-items: center; gap: 6px; }
.verified { font-style: normal; width: 17px; height: 17px; border-radius: 50%; display: inline-grid; place-items: center; background: var(--green); color: #06210f; font-size: 11px; font-weight: 700; }
.gc-price { font-size: 14px; color: var(--gold); font-weight: 700; }
.gc-foot { display: flex; gap: 22px; margin-top: 18px; padding-top: 16px; border-top: 1px solid var(--line); font-size: 13.5px; color: var(--muted-2); }

/* ── 会员 ───────────────────────────────────────────────── */
.plans { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; align-items: start; }
.plan {
  padding: 32px 28px; border-radius: var(--radius-lg);
  background: var(--panel); border: 1px solid var(--line);
  transition: transform 0.3s ease, border-color 0.3s ease;
}
.plan:hover { transform: translateY(-6px); }
.plan-hot {
  border-color: rgba(255, 210, 74, 0.5);
  background: linear-gradient(180deg, rgba(255, 210, 74, 0.11), rgba(255, 255, 255, 0.02));
  box-shadow: 0 28px 60px -34px rgba(255, 190, 60, 0.6);
}
.plan-tag { display: inline-block; padding: 4px 12px; border-radius: 999px; font-size: 12.5px; background: var(--panel-2); border: 1px solid var(--line-2); color: #cfd5e6; margin: 0 0 16px; }
.tag-hot { background: var(--gold); color: #17130a; border-color: transparent; font-weight: 700; }
.plan h3 { font-size: 22px; }
.price { margin: 12px 0 20px; font-family: var(--mono); font-size: 40px; font-weight: 800; display: flex; align-items: baseline; gap: 2px; }
.price .cur { font-size: 22px; }
.price .unit { font-size: 13px; font-family: var(--font); font-weight: 500; color: var(--muted-2); margin-left: 8px; }
.plan ul { display: grid; gap: 11px; padding-top: 20px; border-top: 1px solid var(--line); }
.plan ul li { position: relative; padding-left: 24px; font-size: 14.5px; color: #c6ccdd; }
.plan ul li::before { content: "✓"; position: absolute; left: 0; top: -1px; color: var(--green); font-weight: 700; }
.plan-note { margin-top: 20px; font-size: 13px; color: var(--muted-2); }

.benefits { margin-top: 56px; padding: 36px; border-radius: var(--radius-lg); background: var(--panel); border: 1px solid var(--line); }
.benefits h3 { font-size: 20px; margin-bottom: 26px; }
.benefit-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.b span { font-size: 20px; display: block; margin-bottom: 10px; }
.b strong { display: block; font-size: 15.5px; margin-bottom: 6px; }
.b p { font-size: 13.5px; color: var(--muted); }

/* ── 粒豆 ───────────────────────────────────────────────── */
.coins-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.coin-card {
  padding: 30px 26px; border-radius: var(--radius); text-align: center;
  background: var(--panel); border: 1px solid var(--line);
  transition: transform 0.3s ease, border-color 0.3s ease;
}
.coin-card:hover { transform: translateY(-6px); border-color: var(--line-2); }
.cc-ic { font-size: 30px; display: block; margin-bottom: 14px; }
.coin-card h3 { font-size: 18px; margin-bottom: 8px; }
.coin-card p { color: var(--muted); font-size: 14.5px; }

/* ── 步骤 ───────────────────────────────────────────────── */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.step { padding: 32px 28px; border-radius: var(--radius); background: var(--panel); border: 1px solid var(--line); }
.step-n {
  display: grid; place-items: center; width: 44px; height: 44px; border-radius: 14px;
  font-family: var(--mono); font-size: 19px; font-weight: 700; color: #17130a;
  background: linear-gradient(135deg, var(--gold), var(--gold-deep)); margin-bottom: 18px;
}
.step h3 { font-size: 18px; margin-bottom: 8px; }
.step p { color: var(--muted); font-size: 14.5px; }

/* ── FAQ ────────────────────────────────────────────────── */
.faq { display: grid; gap: 12px; }
.qa { border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); overflow: hidden; transition: border-color 0.25s ease; }
.qa[open] { border-color: var(--line-2); }
.qa summary {
  cursor: pointer; list-style: none; padding: 20px 56px 20px 24px; position: relative;
  font-size: 16.5px; font-weight: 600;
}
.qa summary::-webkit-details-marker { display: none; }
.qa summary::after {
  content: "+"; position: absolute; right: 22px; top: 50%; transform: translateY(-50%);
  font-size: 22px; font-weight: 400; color: var(--muted-2); transition: transform 0.25s ease, color 0.25s ease;
}
.qa[open] summary::after { content: "−"; color: var(--gold); }
.qa-body { padding: 0 24px 22px; color: var(--muted); font-size: 15px; }

/* ── 扫码区 ─────────────────────────────────────────────── */
.cta-section { padding-bottom: 118px; }
.cta-inner {
  display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 56px; align-items: center;
  padding: 56px; border-radius: 34px;
  background: radial-gradient(760px 400px at 12% 0%, rgba(255, 210, 74, 0.14), transparent 62%),
    radial-gradient(700px 420px at 100% 100%, rgba(90, 131, 255, 0.18), transparent 62%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.02));
  border: 1px solid var(--line-2);
}
.cta-copy h2 { font-size: clamp(28px, 3.4vw, 40px); font-weight: 800; }
.cta-copy .sub { margin-top: 16px; color: var(--muted); max-width: 460px; }
.cta-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 16px; margin-top: 30px; }
.cta-hint { font-size: 13.5px; color: var(--muted-2); }

.qr-card {
  padding: 22px; border-radius: var(--radius-lg); background: #fff; text-align: center;
  box-shadow: 0 30px 60px -30px rgba(0, 0, 0, 0.95);
  justify-self: center;
}
.qr-card img { width: 260px; height: 260px; border-radius: 14px; }
.qr-cap { margin-top: 14px; font-size: 13.5px; color: #4a5162; }

/* ── 页脚 ───────────────────────────────────────────────── */
.footer { border-top: 1px solid var(--line); background: rgba(255, 255, 255, 0.014); padding: 62px 0 30px; }
.footer-inner { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 40px; }
.f-brand { display: flex; gap: 14px; align-items: flex-start; }
.f-brand strong { font-size: 18px; display: block; }
.f-brand p { color: var(--muted-2); font-size: 14px; margin-top: 4px; }
.f-col { display: flex; flex-direction: column; gap: 10px; }
.f-col h4 { font-size: 13px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted-2); margin-bottom: 6px; }
.f-col a { font-size: 14.5px; color: #c6ccdd; transition: color 0.2s ease; }
.f-col a:hover { color: var(--gold); }
.f-muted { font-size: 14px; color: var(--muted-2); }
.footer-bar { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; margin-top: 48px; padding-top: 22px; border-top: 1px solid var(--line); font-size: 13px; color: var(--muted-2); }
.f-legal { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 16px; }
.f-icp { color: var(--muted-2); transition: color 0.2s ease; }
.f-icp:hover { color: var(--gold); }

/* ── 动效 ───────────────────────────────────────────────── */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity 0.7s cubic-bezier(0.2, 0.8, 0.2, 1), transform 0.7s cubic-bezier(0.2, 0.8, 0.2, 1); }
.reveal.in { opacity: 1; transform: none; }

/* ── 响应式 ─────────────────────────────────────────────── */
@media (max-width: 1080px) {
  .cards { grid-template-columns: repeat(2, 1fr); }
  .card-lg { grid-column: span 2; }
  .flow { grid-template-columns: repeat(2, 1fr); }
  .benefit-grid { grid-template-columns: repeat(2, 1fr); }
  .coins-grid { grid-template-columns: repeat(2, 1fr); }
  .mosaic { grid-template-columns: repeat(20, 1fr); }
  .footer-inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 920px) {
  .hero-inner, .community-inner, .cta-inner { grid-template-columns: 1fr; gap: 46px; }
  .art-card { transform: none; }
  .community-art { order: -1; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 24px; }
  .plans { grid-template-columns: 1fr; }
  .plan-hot { order: -1; }
  .nav-links { display: none; }
  .nav-links.open {
    display: flex; flex-direction: column; gap: 2px;
    position: absolute; left: 12px; right: 12px; top: 70px;
    padding: 14px; border-radius: 20px;
    background: rgba(10, 12, 20, 0.97); border: 1px solid var(--line-2);
    backdrop-filter: blur(14px); box-shadow: var(--shadow);
  }
  .nav-links.open a { padding: 12px 14px; border-radius: 12px; font-size: 15.5px; }
  .nav-burger { display: block; }
  .nav-actions .btn-sm { display: none; }
  .chip-a, .chip-b, .chip-c { display: none; }
}

@media (max-width: 640px) {
  .section { padding: 76px 0; }
  .wrap { padding: 0 18px; }
  .cards, .flow, .benefit-grid, .coins-grid, .steps, .palette-notes { grid-template-columns: 1fr; }
  .card-lg { grid-column: span 1; }
  .flow-demo { grid-template-columns: 1fr; }
  .demo-arrow { transform: rotate(90deg); }
  .mosaic { grid-template-columns: repeat(12, 1fr); gap: 5px; padding: 16px; }
  .cta-inner { padding: 34px 24px; border-radius: 26px; }
  .benefits { padding: 26px 22px; }
  .footer-inner { grid-template-columns: 1fr; gap: 28px; }
  .hero-stats dt { font-size: 25px; }
  .qr-card img { width: 210px; height: 210px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
}