/* 商擎智能营销官网。零依赖：不引外部字体与 CDN，保证国内网络可达。 */

:root {
  --brand: #1677ff;
  --brand-2: #722ed1;
  --brand-soft: #e8f1ff;
  --grad: linear-gradient(100deg, #2f8bff 0%, #6a5cff 52%, #9a4dff 100%);

  --ink: #070b1a;
  --ink-2: #0d1430;
  --ink-line: rgba(255, 255, 255, 0.09);
  --on-ink: #eef2ff;
  --on-ink-mute: #9aa6c7;

  --bg: #ffffff;
  --bg-tint: #f5f7fc;
  --text: #0e1630;
  --mute: #56607a;
  --line: #e4e8f2;
  --ok: #12b76a;
  --warn: #f79009;

  --radius: 18px;
  --radius-sm: 12px;
  --shadow: 0 1px 2px rgba(14, 22, 48, 0.04), 0 12px 32px -12px rgba(14, 22, 48, 0.14);
  --shadow-lg: 0 40px 80px -30px rgba(9, 16, 48, 0.55);

  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei UI",
    "Microsoft YaHei", "Segoe UI", "Noto Sans CJK SC", "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, Consolas, monospace;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, h4, p, ul, ol, dl, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }
button { font: inherit; cursor: pointer; }
[hidden] { display: none !important; }
:focus-visible { outline: 2px solid #7aa7ff; outline-offset: 3px; border-radius: 6px; }

.wrap { width: 100%; max-width: 1200px; margin: 0 auto; padding-inline: 24px; }
.wrap-narrow { max-width: 860px; }
.ico { width: 1.15em; height: 1.15em; flex: none; }
.grad { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  border: 1px solid transparent; border-radius: 999px;
  font-weight: 600; white-space: nowrap; cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background-color 0.18s ease, border-color 0.18s ease;
}
.btn:active { transform: translateY(1px) scale(0.99); }
.btn-sm { padding: 8px 18px; font-size: 14px; }
.btn-lg { padding: 13px 26px; font-size: 16px; width: 100%; }
.btn-xl { padding: 14px 30px 14px 24px; font-size: 17px; min-height: 64px; }
.btn-primary { color: #fff; background: var(--grad); background-size: 140% 100%; box-shadow: 0 10px 28px -8px rgba(74, 108, 255, 0.7); }
.btn-primary:hover { transform: translateY(-2px); background-position: 100% 0; box-shadow: 0 16px 36px -8px rgba(98, 92, 255, 0.8); }
.btn-ghost { color: var(--on-ink); border-color: rgba(255, 255, 255, 0.2); background: rgba(255, 255, 255, 0.04); }
.btn-ghost:hover { background: rgba(255, 255, 255, 0.1); border-color: rgba(255, 255, 255, 0.34); }
.btn-outline { color: var(--brand); border-color: #bcd4ff; background: #fff; }
.btn-outline:hover { background: var(--brand-soft); border-color: var(--brand); }
.btn-xl .ico-os { width: 28px; height: 28px; }
.btn-text { display: flex; flex-direction: column; align-items: flex-start; line-height: 1.25; text-align: left; }
.btn-text strong { font-size: 18px; font-weight: 700; }
.btn-text small { font-size: 12.5px; font-weight: 500; opacity: 0.86; }
.btn.is-loading { pointer-events: none; opacity: 0.6; box-shadow: none; }
.btn.is-failed { background: #fff; color: var(--brand); border-color: #bcd4ff; box-shadow: none; }

/* ---------- 导航 ---------- */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 50;
  padding-top: env(safe-area-inset-top, 0px);
  color: var(--on-ink);
  transition: background-color 0.25s ease, box-shadow 0.25s ease, color 0.25s ease;
}
.nav-inner { display: flex; align-items: center; gap: 28px; height: 68px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; font-size: 17px; letter-spacing: 0.01em; }
.brand-mark {
  display: grid; place-items: center; width: 34px; height: 34px; border-radius: 9px;
  background: #fff; box-shadow: 0 2px 10px rgba(0, 0, 0, 0.18); overflow: hidden;
}
/* 图标源图四周留白较多，放大裁切后主体才够饱满 */
.brand-mark, .final-mark { position: relative; }
.brand-mark img, .final-mark img { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); max-width: none; }
.brand-mark img { width: 44px; height: 44px; }
.final-mark img { width: 108px; height: 108px; }
.nav-links { display: flex; gap: 4px; margin-left: 8px; }
.nav-links a { padding: 8px 14px; border-radius: 999px; font-size: 15px; opacity: 0.82; transition: opacity 0.15s, background-color 0.15s; }
.nav-links a:hover { opacity: 1; background: rgba(127, 140, 190, 0.16); }
.nav-actions { margin-left: auto; display: flex; align-items: center; gap: 16px; }
.nav-login { font-size: 15px; opacity: 0.86; }
.nav-login:hover { opacity: 1; }
.nav.is-solid {
  color: var(--text);
  background: rgba(255, 255, 255, 0.86);
  -webkit-backdrop-filter: saturate(180%) blur(16px); backdrop-filter: saturate(180%) blur(16px);
  box-shadow: 0 1px 0 var(--line);
}
.nav.is-solid .brand-mark { box-shadow: 0 0 0 1px var(--line); }

/* ---------- 首屏 ---------- */
.hero { position: relative; color: var(--on-ink); background: var(--ink); padding: 148px 0 72px; overflow: hidden; isolation: isolate; }
.hero-bg { position: absolute; inset: 0; z-index: -1; }
.glow { position: absolute; border-radius: 50%; filter: blur(90px); opacity: 0.6; }
.glow-a { width: 720px; height: 520px; left: 50%; top: -180px; transform: translateX(-72%); background: #1f5dff; animation: drift 16s ease-in-out infinite alternate; }
.glow-b { width: 640px; height: 480px; left: 50%; top: -80px; transform: translateX(8%); background: #7a2cf0; opacity: 0.5; animation: drift 19s ease-in-out infinite alternate-reverse; }
@keyframes drift { to { margin-left: 70px; margin-top: 40px; } }
.grid-lines {
  position: absolute; inset: 0;
  background-image: linear-gradient(var(--ink-line) 1px, transparent 1px), linear-gradient(90deg, var(--ink-line) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 30%, #000 20%, transparent 75%);
  mask-image: radial-gradient(ellipse 70% 60% at 50% 30%, #000 20%, transparent 75%);
}
.hero-inner { text-align: center; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px; padding: 6px 16px; margin-bottom: 26px;
  font-size: 14px; color: #cfd9ff; border: 1px solid rgba(255, 255, 255, 0.14); border-radius: 999px;
  background: rgba(255, 255, 255, 0.05);
}
.eyebrow .dot { width: 7px; height: 7px; border-radius: 50%; background: #4ade80; box-shadow: 0 0 0 4px rgba(74, 222, 128, 0.18); }
.hero h1 { font-size: clamp(34px, 5.6vw, 68px); line-height: 1.16; font-weight: 800; letter-spacing: -0.02em; }
.hero h1 .grad { background-image: linear-gradient(100deg, #6fb1ff 0%, #9d8bff 50%, #d08bff 100%); }
.lead { max-width: 720px; margin: 24px auto 0; font-size: clamp(16px, 1.6vw, 19px); color: var(--on-ink-mute); }
.hero-cta { display: flex; flex-wrap: wrap; justify-content: center; gap: 14px; margin-top: 40px; }
.hero-meta { margin-top: 18px; font-size: 14px; color: var(--on-ink-mute); min-height: 24px; }
.hero-meta b { color: var(--on-ink); font-weight: 600; }
.hero-meta .warn { color: #ffd591; }
.hero-alt { margin-top: 6px; font-size: 14px; color: var(--on-ink-mute); display: flex; gap: 10px; justify-content: center; }
.hero-alt a { text-decoration: underline; text-underline-offset: 4px; text-decoration-color: rgba(255, 255, 255, 0.28); }
.hero-alt a:hover { color: var(--on-ink); }
.noscript { margin-top: 18px; font-size: 14px; color: #ffd591; }
.noscript a { text-decoration: underline; }

/* 产品窗口示意 */
.hero-shot { margin-top: 64px; position: relative; }
.window {
  border-radius: 16px; overflow: hidden; border: 1px solid rgba(255, 255, 255, 0.14);
  background: #f7f8fc; color: var(--text); box-shadow: var(--shadow-lg), 0 0 0 1px rgba(0, 0, 0, 0.3);
  text-align: left; font-size: 13px; line-height: 1.55;
}
.window-bar { display: flex; align-items: center; gap: 8px; height: 40px; padding: 0 16px; background: #e9ecf5; border-bottom: 1px solid #dde1ec; position: relative; }
.tl { width: 12px; height: 12px; border-radius: 50%; }
.tl-r { background: #ff5f57; } .tl-y { background: #febc2e; } .tl-g { background: #28c840; }
.window-title { position: absolute; left: 0; right: 0; text-align: center; font-size: 12.5px; color: #6a7390; pointer-events: none; }
.shot-tabs { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; margin-bottom: 22px; }
.shot-tab {
  padding: 8px 18px; border-radius: 999px; font-size: 14.5px; font-weight: 600; color: var(--on-ink-mute);
  border: 1px solid rgba(255, 255, 255, 0.14); background: rgba(255, 255, 255, 0.04);
  transition: color 0.18s ease, background-color 0.18s ease, border-color 0.18s ease;
}
.shot-tab:hover { color: var(--on-ink); border-color: rgba(255, 255, 255, 0.3); }
.shot-tab.is-on { color: #fff; border-color: transparent; background: var(--grad); }
.shot-stage { aspect-ratio: 16 / 10; background: #f5f7fc; }
.shot-stage img { width: 100%; height: 100%; object-fit: cover; object-position: top left; transition: opacity 0.28s ease; }
.shot-stage img.is-swapping { opacity: 0; }
.shot-note { margin-top: 0; padding: 10px 0 14px; text-align: center; font-size: 12px; color: #69749a; }
.hero .shot-note { color: #8d97b6; padding: 16px 0 0; }
.shot-note.in-card { padding: 8px 0 0; text-align: right; }

/* ---------- 事实条 ---------- */
.facts { background: var(--bg); border-bottom: 1px solid var(--line); }
.facts-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.fact { padding: 40px 24px; text-align: center; }
.fact + .fact { border-left: 1px solid var(--line); }
.fact b { font-size: 42px; font-weight: 800; line-height: 1.1; letter-spacing: -0.02em; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; font-variant-numeric: tabular-nums; }
.fact b span { font-size: 20px; margin-left: 2px; }
.fact p { margin-top: 8px; font-size: 14px; color: var(--mute); line-height: 1.6; }

/* ---------- 通用区块 ---------- */
.section { padding: 112px 0; }
.section-tint { background: var(--bg-tint); }
.section-head { text-align: center; max-width: 760px; margin: 0 auto 72px; }
.kicker { font-size: 14px; font-weight: 700; letter-spacing: 0.16em; color: var(--brand); margin-bottom: 14px; }
.section-head h2 { font-size: clamp(28px, 3.6vw, 44px); line-height: 1.25; font-weight: 800; letter-spacing: -0.015em; }
.section-head h2 + p { margin-top: 16px; font-size: 17px; color: var(--mute); }

/* ---------- 大功能块 ---------- */
.feature { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.08fr); gap: 72px; align-items: center; }
.feature + .feature { margin-top: 128px; }
.feature-flip .feature-copy { order: 2; }
.feature-tag { display: inline-flex; align-items: center; gap: 8px; padding: 6px 14px; border-radius: 999px; font-size: 14px; font-weight: 600; color: var(--brand); background: var(--brand-soft); }
.feature h3 { margin-top: 20px; font-size: clamp(24px, 2.7vw, 34px); line-height: 1.32; font-weight: 800; letter-spacing: -0.01em; }
.feature-copy > p { margin-top: 16px; color: var(--mute); font-size: 16.5px; }
.ticks { margin-top: 24px; display: grid; gap: 12px; }
.ticks li { display: flex; gap: 12px; align-items: flex-start; font-size: 15.5px; color: #2c3552; }
.ticks .ico { margin-top: 5px; width: 18px; height: 18px; padding: 3px; color: #fff; background: var(--grad); border-radius: 50%; }
.ticks b { color: var(--text); }

.feature-visual {
  position: relative; border-radius: 28px; padding: 36px; min-height: 420px;
  display: flex; flex-direction: column; justify-content: center; gap: 18px;
  background: radial-gradient(120% 90% at 0% 0%, #e6efff 0%, transparent 60%), radial-gradient(120% 90% at 100% 100%, #f0e6ff 0%, transparent 60%), #f5f7fd;
  border: 1px solid #e6eaf6; font-size: 14px; line-height: 1.6;
}
.card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 20px; box-shadow: var(--shadow); }
.card-h { display: flex; align-items: center; gap: 8px; font-weight: 700; margin-bottom: 12px; color: var(--text); }
.card-h .ico { color: var(--brand); }

.script { padding: 10px 12px; border-radius: 10px; border: 1px solid var(--line); color: var(--mute); }
.script + .script { margin-top: 8px; }
.script.is-on { color: var(--text); border-color: #a9c8ff; background: #f4f8ff; box-shadow: 0 0 0 3px rgba(22, 119, 255, 0.08); }
.script mark { background: none; color: #d46b08; font-weight: 700; }
.reel { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
.clip { aspect-ratio: 9 / 14; border-radius: 12px; padding: 8px; display: flex; flex-direction: column; justify-content: space-between; color: #fff; font-size: 12px; font-weight: 600; box-shadow: var(--shadow); }
.clip i { align-self: flex-end; font-style: normal; font-size: 11px; padding: 1px 6px; border-radius: 6px; background: rgba(0, 0, 0, 0.35); font-variant-numeric: tabular-nums; }
.c1 { background: linear-gradient(165deg, #ffb37a, #e2584d); }
.c2 { background: linear-gradient(165deg, #6fa8ff, #4338ca); }
.c3 { background: linear-gradient(165deg, #57d6b8, #0f766e); }
.c4 { background: linear-gradient(165deg, #d8a3ff, #7e22ce); }

.v-pilot { align-items: center; }
.panel-shot { width: min(100%, 400px); height: auto; border-radius: 22px; box-shadow: 0 30px 60px -24px rgba(40, 60, 160, 0.45), 0 0 0 1px rgba(14, 22, 48, 0.06); }
.v-pilot .shot-note { padding: 4px 0 0; }

.intent { display: grid; grid-template-columns: 30px minmax(0, 1fr) auto; gap: 10px; align-items: center; padding: 9px 0; }
.intent + .intent { border-top: 1px solid var(--line); }
.avatar { width: 30px; height: 30px; border-radius: 50%; }
.a1 { background: linear-gradient(135deg, #ffd3a5, #fd6585); } .a2 { background: linear-gradient(135deg, #a1c4fd, #6f86d6); } .a3 { background: linear-gradient(135deg, #d4fc79, #4fb47c); }
.lv { font-style: normal; font-size: 12px; padding: 2px 9px; border-radius: 999px; color: var(--mute); background: #eff1f7; white-space: nowrap; }
.lv-hi { color: #b42318; background: #ffeceb; font-weight: 600; }
.confirm-card { margin-left: 12%; border-color: #a9c8ff; box-shadow: 0 18px 40px -16px rgba(22, 119, 255, 0.4); }
.confirm-h { display: flex; gap: 8px; align-items: center; font-weight: 700; margin-bottom: 8px; }
.confirm-h .ico { color: var(--brand); }
.confirm-card p { color: var(--mute); }
.confirm-act { display: flex; justify-content: flex-end; gap: 8px; margin-top: 14px; }
.pill { padding: 4px 11px; border-radius: 999px; font-size: 12px; border: 1px solid var(--line); background: #fff; color: #4a5470; white-space: nowrap; }
.pill-on { color: #fff; border-color: transparent; background: var(--grad); }
.confirm-act .pill { padding: 6px 14px; font-size: 13px; }

.bar { position: relative; display: flex; justify-content: space-between; align-items: center; width: var(--w); min-width: 150px; margin: 0 auto; padding: 9px 16px; border-radius: 10px; color: #fff; font-size: 13.5px; background: var(--grad); }
.bar + .bar { margin-top: 8px; }
.bar b { font-variant-numeric: tabular-nums; }
.bar:nth-of-type(3) { filter: saturate(0.95) brightness(1.03); }

/* ---------- 小卡片 ---------- */
.grid-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.mini { padding: 28px; border-radius: var(--radius); background: #fff; border: 1px solid var(--line); transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease; }
.mini:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: #cfdcf7; }
.mini-ico { display: grid; place-items: center; width: 46px; height: 46px; border-radius: 13px; color: #fff; background: var(--grad); font-size: 20px; }
.mini h4 { margin-top: 18px; font-size: 18px; font-weight: 700; }
.mini p { margin-top: 8px; font-size: 15px; color: var(--mute); }

/* ---------- 流程 ---------- */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; counter-reset: step; }
.steps li { position: relative; padding: 28px 24px; border-radius: var(--radius); border: 1px solid var(--line); background: linear-gradient(180deg, #fff, #f8faff); }
.steps li:not(:last-child)::after { content: ""; position: absolute; top: 46px; right: -16px; width: 12px; height: 12px; border-top: 2px solid #b9c6e6; border-right: 2px solid #b9c6e6; transform: rotate(45deg); z-index: 1; }
.step-n { font-size: 34px; font-weight: 800; line-height: 1; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; font-variant-numeric: tabular-nums; }
.steps h4 { margin-top: 16px; font-size: 18px; }
.steps p { margin-top: 8px; font-size: 15px; color: var(--mute); }

/* ---------- 安全 ---------- */
.section-dark { color: var(--on-ink); background: radial-gradient(80% 60% at 50% 0%, #15224f 0%, transparent 70%), var(--ink); }
.section-dark .kicker { color: #8fb6ff; }
.section-dark .section-head h2 + p { color: var(--on-ink-mute); }
.sec-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--ink-line); border: 1px solid var(--ink-line); border-radius: 24px; overflow: hidden; }
.sec { padding: 34px 30px; background: var(--ink-2); transition: background-color 0.2s ease; }
.sec:hover { background: #121b3d; }
.sec .ico { width: 30px; height: 30px; color: #8fb6ff; }
.sec h4 { margin-top: 18px; font-size: 18px; }
.sec p { margin-top: 8px; font-size: 15px; color: var(--on-ink-mute); }

/* ---------- 下载 ---------- */
.dl-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; align-items: stretch; }
.dl-card { position: relative; display: flex; flex-direction: column; align-items: center; text-align: center; padding: 40px 28px 28px; border-radius: 24px; border: 2px solid var(--line); background: #fff; transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease; }
.dl-card:hover { box-shadow: var(--shadow); }
.dl-card.is-recommended { border-color: transparent; background: linear-gradient(#fff, #fff) padding-box, var(--grad) border-box; box-shadow: 0 24px 60px -28px rgba(83, 97, 255, 0.55); }
.dl-card.is-unsupported { opacity: 0.62; }
.dl-badge { position: absolute; top: -13px; left: 50%; transform: translateX(-50%); padding: 3px 14px; border-radius: 999px; color: #fff; font-size: 12.5px; font-weight: 700; background: var(--grad); white-space: nowrap; }
.dl-os { width: 52px; height: 52px; color: var(--text); }
.dl-card h3 { margin-top: 16px; font-size: 22px; font-weight: 800; }
.dl-req { margin-top: 4px; font-size: 14px; color: var(--mute); }
.dl-ver { margin: 18px 0 22px; min-height: 48px; font-size: 14px; color: var(--mute); line-height: 1.7; }
.dl-ver b { color: var(--text); font-size: 16px; font-variant-numeric: tabular-nums; }
.dl-card .btn { margin-top: auto; }
/* 网页版卡片没有校验值按钮，补等高留白让三张卡的主按钮落在同一条线上 */
.dl-card-web .btn { margin-bottom: 43px; }
.dl-hash-btn { margin-top: 14px; display: inline-flex; align-items: center; gap: 6px; border: 0; background: none; color: var(--mute); font-size: 13px; padding: 4px 8px; border-radius: 8px; }
.dl-hash-btn:hover { color: var(--brand); background: var(--brand-soft); }
.dl-retry { border: 0; background: none; color: var(--brand); text-decoration: underline; text-underline-offset: 3px; padding: 0; font-size: 14px; }
.skeleton { display: inline-block; width: 150px; height: 14px; border-radius: 7px; background: linear-gradient(90deg, #eef1f8 0%, #f8f9fd 50%, #eef1f8 100%); background-size: 200% 100%; animation: shimmer 1.3s linear infinite; }
@keyframes shimmer { to { background-position: -200% 0; } }

.dl-mobile { margin-top: 24px; display: flex; flex-wrap: wrap; align-items: center; gap: 14px; padding: 18px 22px; border-radius: var(--radius); background: #fff8eb; border: 1px solid #ffe0a6; color: #7a4b00; font-size: 15px; }
.dl-mobile > .ico { width: 24px; height: 24px; }
.dl-mobile p { flex: 1 1 240px; }

.help { margin-top: 56px; max-width: 860px; margin-inline: auto; }
.help h3 { font-size: 20px; margin-bottom: 14px; }
details { border-bottom: 1px solid var(--line); }
details summary { list-style: none; cursor: pointer; display: flex; justify-content: space-between; align-items: center; gap: 16px; padding: 18px 4px; font-weight: 600; font-size: 16.5px; }
details summary::-webkit-details-marker { display: none; }
details summary::after { content: ""; flex: none; width: 9px; height: 9px; border-right: 2px solid #8a94b0; border-bottom: 2px solid #8a94b0; transform: rotate(45deg); transition: transform 0.2s ease; margin-right: 6px; }
details[open] summary::after { transform: rotate(-135deg); }
details summary:hover { color: var(--brand); }
details p { padding: 0 4px 16px; color: var(--mute); font-size: 15.5px; }
details pre { margin: 0 4px 18px; padding: 14px 16px; border-radius: var(--radius-sm); background: var(--ink); color: #d6e0ff; font: 13px/1.7 var(--mono); overflow-x: auto; }
.faq { background: #fff; border: 1px solid var(--line); border-radius: 24px; padding: 8px 28px; }
.faq details:last-child { border-bottom: 0; }

/* ---------- 收尾 ---------- */
.final { position: relative; color: var(--on-ink); background: radial-gradient(60% 120% at 50% 120%, #3a2a9c 0%, transparent 70%), radial-gradient(50% 100% at 20% 0%, #123a9c 0%, transparent 70%), var(--ink); padding: 104px 0; text-align: center; overflow: hidden; }
.final-mark { display: inline-grid; place-items: center; width: 84px; height: 84px; border-radius: 22px; background: #fff; box-shadow: 0 20px 50px -12px rgba(88, 101, 255, 0.7); overflow: hidden; }
.final h2 { margin-top: 28px; font-size: clamp(26px, 3.4vw, 40px); font-weight: 800; letter-spacing: -0.01em; }

.footer { color: var(--on-ink-mute); background: #050814; font-size: 14px; }
.footer .brand { color: var(--on-ink); }
.footer-inner { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 24px; padding-block: 40px 28px; }
.footer-brand p { margin-top: 8px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 8px 26px; }
.footer-links a:hover, .footer-legal a:hover { color: var(--on-ink); }
.footer-legal { display: flex; flex-wrap: wrap; gap: 6px 22px; padding-block: 20px calc(28px + env(safe-area-inset-bottom, 0px)); border-top: 1px solid var(--ink-line); font-size: 13px; }
.footer-tm { opacity: 0.7; }

/* ---------- 提示条 ---------- */
.toast {
  position: fixed; left: 50%; bottom: calc(28px + env(safe-area-inset-bottom, 0px)); z-index: 80; transform: translateX(-50%);
  max-width: min(560px, calc(100vw - 32px)); padding: 12px 20px; border-radius: 14px;
  color: #fff; background: rgba(13, 20, 48, 0.94); box-shadow: 0 16px 40px -10px rgba(0, 0, 0, 0.5);
  font-size: 14.5px; animation: toast-in 0.25s ease;
}
.toast a { color: #9cc2ff; text-decoration: underline; text-underline-offset: 3px; margin-left: 6px; }
@keyframes toast-in { from { opacity: 0; transform: translate(-50%, 12px); } }

/* ---------- 进场动效 ---------- */
.js .reveal { opacity: 0; transform: translateY(26px); transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.2, 0.7, 0.2, 1); }
.js .reveal.is-in { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .feature { gap: 48px; }
}
@media (max-width: 900px) {
  .nav-links { display: none; }
  .section { padding: 80px 0; }
  .section-head { margin-bottom: 48px; }
  .feature, .feature-flip { grid-template-columns: 1fr; gap: 36px; }
  .feature-flip .feature-copy { order: 0; }
  .feature + .feature { margin-top: 88px; }
  .feature-visual { min-height: 0; padding: 24px; }
  .facts-grid { grid-template-columns: repeat(2, 1fr); }
  .fact:nth-child(3) { border-left: 0; }
  .fact:nth-child(n + 3) { border-top: 1px solid var(--line); }
  .grid-cards, .sec-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .steps li::after { display: none; }
  .dl-grid { grid-template-columns: 1fr; max-width: 460px; margin-inline: auto; gap: 28px; }
}
@media (max-width: 640px) {
  .wrap { padding-inline: 18px; }
  .nav-login { display: none; }
  .hero { padding-top: 116px; }
  .hero h1 { font-size: clamp(30px, 8.6vw, 40px); }
  .lead br { display: none; }
  .hero-cta .btn { width: 100%; }
  .hero-shot { margin-top: 48px; }
  .shot-tab { padding: 7px 13px; font-size: 13.5px; }
  .fact { padding: 28px 12px; }
  .fact b { font-size: 32px; }
  .grid-cards, .sec-grid, .steps { grid-template-columns: 1fr; }
  .reel { grid-template-columns: repeat(2, 1fr); }
  .confirm-card { margin-left: 0; }
  .feature h3 br { display: none; }
  .faq { padding: 4px 18px; }
}

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