/* AI Interpreter — 官网样式表
   配色与圆角取自 App 的 BrandPalette 与 Android AppTheme，双端与官网保持同一套视觉语言。 */

:root {
  --navy-deep: #061233;
  --navy: #0A1E4E;
  --glow: #3D8BFF;
  --badge-blue: #9CC4FF;
  --primary: #1E6FD9;
  --primary-dark: #14559F;

  --paper: #F5F6F9;
  --surface: #FFFFFF;
  --container: #F1F3F6;
  --text: #1A1C1E;
  --text-2: #44474C;
  --text-3: #6A6D72; /* 由 #74777C 压深：原值在 --paper 上只有 4.15:1，未达 AA */
  --line: #E2E5EA;
  --line-strong: #C4C6CC;

  --on-dark-1: #FFFFFF;
  --on-dark-2: #E8EEF8; /* 冷白：原 #DDE8F9 蓝味偏重，深底上读着发灰 */
  --on-dark-3: #D8E0EC; /* 冷白（次级）：原 #AFC6E8 是淡蓝，小字号下最吃亏 */
  --line-dark: rgba(156, 196, 255, .20);
  --btn-outline: rgba(156, 196, 255, .45);

  --wrap: 1200px;
  --pad: 48px;
  --r-btn: 14px;
  --r-card: 16px;
  --r-big: 24px;
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--text);
  font-family: "Instrument Sans", -apple-system, BlinkMacSystemFont, "Segoe UI",
               "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-wrap: pretty;
}

img { max-width: 100%; height: auto; display: block; }
p { margin: 0; }
h1, h2, h3 { margin: 0; font-weight: 600; letter-spacing: -.01em; }
a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-dark); }

:focus-visible { outline: 2px solid var(--glow); outline-offset: 3px; border-radius: 4px; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 var(--pad); }
.section { padding: 100px 0; }
.section[id] { scroll-margin-top: 88px; }
.eyebrow {
  color: var(--primary-dark); font-size: 13px; letter-spacing: .1em;
  font-weight: 500; text-transform: uppercase;
}
.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 50;
  padding: 12px 20px; background: var(--primary); color: #fff; border-radius: 0 0 var(--r-btn) 0;
}
.skip-link:focus { left: 0; color: #fff; }
.h2 { font-size: 42px; line-height: 1.26; }
.lede { color: var(--text-2); font-size: 18px; line-height: 1.76; }
.stack { display: flex; flex-direction: column; }
.on-paper { background: var(--paper); }
.on-surface { background: var(--surface); }

/* ---------- 顶栏 ---------- */
.nav {
  position: sticky; top: 0; z-index: 20;
  background: var(--navy-deep);
  border-bottom: 1px solid var(--line-dark);
}
.nav .wrap { height: 72px; display: flex; align-items: center; gap: 40px; }
.brand { display: flex; align-items: center; gap: 11px; flex-shrink: 0; }
.brand img { width: 40px; height: 40px; border-radius: 10px; }
.brand span { color: var(--on-dark-1); font-size: 22px; font-weight: 600; }
.nav-links { display: flex; align-items: center; gap: 30px; }
.nav-links a { color: var(--on-dark-1); font-size: 17px; white-space: nowrap; }
.nav-links a:hover { color: var(--on-dark-1); text-decoration: underline; text-underline-offset: 6px; }
/* margin-left:auto 而不是给 .nav-links 加 flex-grow —— 链接在窄屏被隐藏后，
   右侧一组仍然贴右，不会连同 logo 一起塌到左边 */
.nav-right { display: flex; align-items: center; gap: 18px; flex-shrink: 0; margin-left: auto; }
.lang-switch {
  display: flex; align-items: center; height: 40px; padding: 0 12px;
  color: var(--on-dark-1); font-size: 17px; letter-spacing: .03em;
}
.lang-switch:hover { color: var(--on-dark-1); text-decoration: underline; text-underline-offset: 6px; }
.nav-cta {
  display: flex; align-items: center; height: 40px; padding: 0 20px;
  border-radius: var(--r-btn); background: var(--primary);
  color: #fff; font-size: 17px; font-weight: 500;
}
.nav-cta:hover { background: var(--primary-dark); color: #fff; }

/* ---------- 商店按钮 ---------- */
.store-row { display: flex; flex-wrap: wrap; gap: 14px; }
.store-btn {
  display: flex; align-items: center; gap: 12px;
  height: 56px; padding: 0 24px; border-radius: var(--r-btn);
  border: 1px solid transparent;
}
.store-btn svg { flex-shrink: 0; }
.store-btn .cap { display: flex; flex-direction: column; line-height: 1.2; }
.store-btn .cap small { font-size: 11px; letter-spacing: .04em; }
.store-btn .cap strong { font-size: 16px; font-weight: 600; }
.store-primary { background: var(--primary); color: #fff; }
.store-primary:hover { background: var(--primary-dark); color: #fff; }
.store-primary .cap small { color: rgba(255, 255, 255, .92); }
.store-ghost { background: rgba(61, 139, 255, .12); border-color: var(--btn-outline); color: var(--on-dark-1); }
.store-ghost:hover { background: rgba(61, 139, 255, .22); color: var(--on-dark-1); }
.store-ghost .cap small { color: var(--on-dark-3); }
/* 商店尚未上线：同样的外形，但不是链接，也不做 hover 反馈 */
.store-soon { cursor: default; }
.store-soon.store-primary:hover { background: var(--primary); }
.store-soon.store-ghost:hover { background: rgba(61, 139, 255, .12); }

/* ---------- 首屏 ---------- */
.hero {
  position: relative; overflow: hidden;
  background: radial-gradient(120% 90% at 50% 55%, #00306F 0%, #00245E 42%, #011138 100%);
}
.hero::before {
  content: ""; position: absolute; inset: 0; opacity: .28;
  background-image:
    linear-gradient(var(--line-dark) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-dark) 1px, transparent 1px);
  background-size: 96px 96px;
}
.hero .wrap {
  position: relative; padding-top: 96px; padding-bottom: 104px;
  display: flex; align-items: center; gap: 64px;
}
.hero-copy { flex: 1 1 560px; display: flex; flex-direction: column; gap: 28px; }
.hero h1 {
  color: var(--on-dark-1); font-size: 60px; line-height: 1.14;
  font-weight: 700; letter-spacing: -.02em;
}
.hero .lede { color: var(--on-dark-2); font-size: 19px; max-width: 560px; }
.pill {
  display: inline-flex; align-items: center; gap: 10px; align-self: flex-start;
  padding: 7px 15px 7px 12px; border: 1px solid var(--btn-outline);
  border-radius: 999px; background: rgba(61, 139, 255, .16);
  color: var(--on-dark-2); font-size: 13px; letter-spacing: .08em;
}
.hero-facts {
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px 16px;
  color: var(--on-dark-3); font-size: 14px;
}
.hero-facts .dot { width: 3px; height: 3px; border-radius: 50%; background: currentColor; }
.hero-shot { flex: 0 0 auto; position: relative; display: flex; justify-content: center; }
.hero-shot::before {
  content: ""; position: absolute; top: 30px; left: 50%; margin-left: -180px;
  width: 360px; height: 580px; border-radius: 50%;
  background: radial-gradient(circle, rgba(61, 139, 255, .30) 0%, rgba(61, 139, 255, 0) 68%);
}
.hero-shot img {
  position: relative; width: 300px; border-radius: var(--r-big);
  border: 1px solid rgba(255, 255, 255, .20);
  box-shadow: 0 40px 90px rgba(1, 17, 56, .7);
}

/* ---------- 场景条 ---------- */
.rail { background: var(--navy); border-top: 1px solid var(--line-dark); }
.rail .wrap {
  padding-top: 24px; padding-bottom: 24px;
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px 20px;
}
.rail-label { color: var(--on-dark-3); font-size: 13px; letter-spacing: .06em; white-space: nowrap; }
.rail-items {
  margin: 0; padding: 0;
  display: flex; flex-wrap: wrap; align-items: center; gap: 10px 24px;
}
.rail-items li { color: var(--on-dark-1); font-size: 16px; list-style: none; }

/* ---------- 通用卡片 ---------- */
.cards { display: grid; gap: 20px; }
.cards-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.cards-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.card {
  display: flex; flex-direction: column; gap: 16px;
  padding: 32px 30px 36px; background: var(--surface); border-radius: var(--r-card);
}
.on-surface .card { background: var(--container); }
.card h3 { font-size: 21px; line-height: 1.4; }
.card p { color: var(--text-2); font-size: 16px; line-height: 1.8; }
.icon-box {
  display: flex; align-items: center; justify-content: center;
  width: 48px; height: 48px; border-radius: 12px; background: rgba(30, 111, 217, .10);
}
.chips { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin: 0; padding: 0; }
.chips li {
  list-style: none; padding: 8px 16px; border-radius: 999px;
  background: var(--surface); color: var(--text-2); font-size: 15px;
}
.on-surface .chips li { background: var(--container); }
.chips .chips-label {
  background: none; padding: 0; margin-right: 4px;
  color: var(--text-3); font-size: 14px;
}

/* ---------- 开发者故事 ---------- */
/* 版式与 FAQ 一致：左侧窄栏放标题与落款，右侧正文，整体与其他板块同宽 */
.story { display: flex; align-items: flex-start; gap: 72px; }
.story-side { flex: 0 0 300px; display: flex; flex-direction: column; gap: 18px; }
.story-side h2 { font-size: 30px; line-height: 1.34; }
.story-body { flex: 1 1 auto; display: flex; flex-direction: column; gap: 18px; }
.story-body p { color: var(--text-2); font-size: 17px; line-height: 1.85; }
.story-sign {
  display: flex; align-items: center; gap: 12px;
  margin-top: 2px; color: var(--text-3); font-size: 15px;
}
.story-sign img {
  width: 48px; height: 48px; border-radius: 50%;
  border: 1px solid var(--line); object-fit: cover;
}

/* ---------- 图文双栏 ---------- */
.split { display: flex; align-items: center; gap: 64px; }
.split-copy { flex: 1 1 480px; display: flex; flex-direction: column; gap: 30px; }
.split-shot { flex: 0 0 auto; }
.split-shot img { width: 340px; border-radius: 26px; border: 1px solid var(--line); }
.split-reverse { flex-direction: row-reverse; }

.feature-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.feature {
  display: flex; gap: 14px; padding: 22px 24px;
  background: var(--container); border-radius: var(--r-card);
}
.on-surface .feature { background: var(--paper); }
.feature svg { flex-shrink: 0; margin-top: 2px; }
.feature b { display: block; font-size: 16px; font-weight: 600; }
.feature span { color: var(--text-2); font-size: 15px; line-height: 1.6; }

/* ---------- 模式 ---------- */
.mode {
  display: flex; gap: 20px; padding: 28px;
  border-radius: var(--r-card); background: var(--surface);
}
.on-surface .mode { background: var(--container); }
.mode-featured { background: rgba(30, 111, 217, .07); }
.on-surface .mode-featured { background: rgba(30, 111, 217, .07); }
.mode .icon-box { width: 44px; height: 44px; flex-shrink: 0; }
.mode h3 { font-size: 20px; }
.mode p { color: var(--text-2); font-size: 16px; line-height: 1.74; }
.tag {
  padding: 3px 10px; border-radius: 999px; background: rgba(30, 111, 217, .12);
  color: var(--primary-dark); font-size: 12px; white-space: nowrap;
}
.mode-head { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.roadmap {
  display: flex; flex-direction: column; gap: 20px;
  padding: 30px 34px 34px; border: 1px dashed var(--line-strong); border-radius: var(--r-card);
}
.roadmap-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
.roadmap-grid b { display: block; font-size: 16px; font-weight: 500; }
.roadmap-grid span { color: var(--text-3); font-size: 14px; line-height: 1.6; }

/* ---------- 摘要要点 ---------- */
.ticks { display: flex; flex-direction: column; gap: 14px; margin: 0; padding: 0; }
.ticks li { list-style: none; display: flex; align-items: flex-start; gap: 14px; font-size: 16px; line-height: 1.7; }
.ticks svg { flex-shrink: 0; margin-top: 4px; }
.ticks b { font-weight: 600; }
.ticks span { color: var(--text-2); }
.shot-pair { display: flex; align-items: flex-start; gap: 20px; flex-shrink: 0; }  /* 不能 stretch：右图有 margin-top，会把左图 height:auto 拉高 */
.shot-pair img { width: 264px; border-radius: var(--r-big); border: 1px solid var(--line); }
.shot-pair img + img { margin-top: 56px; }

/* ---------- 语言 ---------- */
.langs .wrap { display: flex; flex-direction: column; align-items: center; gap: 38px; }
.langs .head { display: flex; flex-direction: column; gap: 16px; align-items: center; text-align: center; max-width: 660px; }
.langs .chips { justify-content: center; max-width: 940px; }

/* ---------- 隐私 ---------- */
.privacy { position: relative; overflow: hidden; background: var(--navy-deep); }
.privacy::before {
  content: ""; position: absolute; bottom: -300px; left: 50%; margin-left: -470px;
  width: 940px; height: 600px; border-radius: 50%;
  background: radial-gradient(circle, rgba(20, 51, 122, .9) 0%, rgba(20, 51, 122, 0) 70%);
}
.privacy .wrap { position: relative; display: flex; flex-direction: column; gap: 48px; }
.privacy h2, .cta h2 { color: var(--on-dark-1); }
.privacy .lede { color: var(--on-dark-2); }
.privacy .eyebrow { color: var(--on-dark-3); }
.dark-card {
  display: flex; flex-direction: column; gap: 12px; padding: 28px 30px 32px;
  border: 1px solid var(--line-dark); border-radius: var(--r-card);
  background: rgba(156, 196, 255, .06);
}
.dark-card h3 { color: var(--on-dark-1); font-size: 19px; }
.dark-card p { color: var(--on-dark-2); font-size: 15px; line-height: 1.78; }
.link-arrow {
  display: inline-flex; align-items: center; gap: 8px; align-self: flex-start;
  min-height: 44px; color: var(--badge-blue); font-size: 16px;
}
.link-arrow:hover { color: var(--on-dark-1); }

/* ---------- 价格 ---------- */
.price-head { display: flex; align-items: stretch; justify-content: space-between; gap: 44px; }
.price-intro { display: flex; flex-direction: column; gap: 16px; max-width: 620px; }
.free-card {
  flex: 0 0 340px; display: flex; flex-direction: column; justify-content: center; gap: 10px;
  padding: 26px 30px; background: var(--surface); border-radius: var(--r-card);
}
.free-card .label { color: var(--text-3); font-size: 13px; letter-spacing: .06em; text-transform: uppercase; }
.free-card .big { font-size: 34px; font-weight: 600; color: var(--primary); letter-spacing: -.02em; }
.free-card .note { color: var(--text-2); font-size: 15px; line-height: 1.6; }
.tiers { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.tier {
  display: flex; flex-direction: column; gap: 18px;
  padding: 30px 28px 32px; background: var(--surface); border-radius: var(--r-card);
}
.tier .name { font-size: 18px; font-weight: 600; margin: 0; }
.tier .who { color: var(--text-3); font-size: 14px; }
.tier .amount { display: flex; align-items: baseline; gap: 6px; }
.tier .amount b { font-size: 36px; font-weight: 600; letter-spacing: -.02em; }
.tier .amount span { color: var(--text-3); font-size: 15px; }
.tier hr { width: 100%; height: 1px; border: 0; background: var(--line); margin: 0; }
.tier .mins { font-size: 16px; color: var(--text-2); }
.tier .mins b { color: var(--text); font-weight: 600; }
.tier .sub { font-size: 15px; color: var(--text-3); line-height: 1.6; }
.tier-featured { background: var(--navy-deep); }
.tier-featured .name, .tier-featured .amount b, .tier-featured .mins b { color: var(--on-dark-1); }
.tier-featured .who, .tier-featured .amount span, .tier-featured .sub { color: var(--on-dark-3); }
.tier-featured .mins { color: var(--on-dark-2); }
.tier-featured hr { background: var(--line-dark); }
.badge-best {
  padding: 4px 11px; border-radius: 999px; background: rgba(61, 139, 255, .28);
  color: var(--on-dark-1); font-size: 12px; white-space: nowrap;
}
.tier-top { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; }
.packs { display: flex; flex-wrap: wrap; gap: 18px; }
.pack {
  flex: 1 1 320px; display: flex; align-items: center; justify-content: space-between; gap: 20px;
  padding: 22px 28px; background: var(--surface); border-radius: var(--r-card);
}
.pack b { font-size: 17px; font-weight: 600; }
.pack span { color: var(--text-3); font-size: 14px; }
.pack .price { font-size: 24px; font-weight: 600; }
.fineprint {
  display: flex; align-items: flex-start; gap: 12px;
  padding: 16px 20px; border: 1px dashed var(--line-strong); border-radius: var(--r-btn);
  color: var(--text-3); font-size: 14px; line-height: 1.7;
}
.fineprint svg { flex-shrink: 0; margin-top: 3px; }

/* ---------- FAQ ---------- */
.faq .wrap { display: flex; gap: 72px; }
.faq-head { flex: 0 0 300px; display: flex; flex-direction: column; gap: 14px; }
.faq-head h2 { font-size: 38px; line-height: 1.28; }
.faq-list { flex: 1 1 auto; }
.faq-item { padding: 24px 0; border-top: 1px solid var(--line); }
.faq-item:last-child { border-bottom: 1px solid var(--line); }
.faq-item h3 { font-size: 19px; margin-bottom: 10px; }
.faq-item p { color: var(--text-2); font-size: 16px; line-height: 1.78; text-wrap: wrap; }

/* ---------- 结尾 CTA ---------- */
.cta {
  background: radial-gradient(110% 100% at 50% 30%, #00306F 0%, #00245E 45%, #011138 100%);
}
.cta .wrap { display: flex; flex-direction: column; align-items: center; gap: 24px; text-align: center; }
.cta img.mark { width: 64px; height: 64px; border-radius: 15px; }
.cta h2, .cta .h2 { font-size: 44px; line-height: 1.24; max-width: 760px; }
.cta p { color: var(--on-dark-2); font-size: 18px; line-height: 1.72; max-width: 580px; }

/* ---------- 页脚 ---------- */
.foot { background: var(--navy-deep); border-top: 1px solid var(--line-dark); }
.foot .wrap { padding-top: 52px; padding-bottom: 40px; display: flex; flex-direction: column; gap: 36px; }
.foot-cols { display: flex; flex-wrap: wrap; gap: 40px 72px; }
.foot-about { flex: 1 1 280px; max-width: 320px; display: flex; flex-direction: column; gap: 13px; }
.foot-about p { color: var(--on-dark-3); font-size: 14px; line-height: 1.7; }
.foot-col { display: flex; flex-direction: column; gap: 12px; }
.foot-col .title { color: var(--on-dark-3); font-size: 12px; letter-spacing: .1em; text-transform: uppercase; }
.foot-col a { color: var(--on-dark-2); font-size: 15px; }
.foot-col a:hover { color: var(--on-dark-1); }
.foot-bottom {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px 24px;
  padding-top: 24px; border-top: 1px solid var(--line-dark);
  color: var(--on-dark-3); font-size: 13px;
}

/* ---------- 博客 ---------- */
.page-head {
  background: radial-gradient(120% 140% at 50% -30%, #00306F 0%, #00245E 45%, #011138 100%);
}
.page-head .wrap {
  max-width: 960px;
  padding-top: 60px; padding-bottom: 52px;
  display: flex; flex-direction: column; gap: 18px;
}
.page-head h1 {
  color: var(--on-dark-1); font-size: 40px; line-height: 1.22;
  font-weight: 700; letter-spacing: -.015em; max-width: 820px;
}
.page-head .lede { color: var(--on-dark-2); max-width: 720px; }
.crumbs { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin: 0; padding: 0; font-size: 14px; color: var(--on-dark-3); }
.crumbs li { list-style: none; display: flex; align-items: center; gap: 8px; }
.crumbs li + li::before { content: "/"; opacity: .55; }
.crumbs a { color: var(--on-dark-3); }
.crumbs a:hover { color: var(--on-dark-1); }
.post-meta { display: flex; flex-wrap: wrap; gap: 6px 16px; color: var(--on-dark-3); font-size: 14px; }

.blog-list { padding: 64px 0 96px; }
.post-list { display: flex; flex-direction: column; gap: 18px; max-width: 860px; }
.post-card {
  display: flex; flex-direction: column; gap: 10px;
  padding: 28px 30px 30px; background: var(--surface); border-radius: var(--r-card);
}
.post-card h2 { font-size: 22px; line-height: 1.42; }
.post-card h2 a { color: var(--text); }
.post-card h2 a:hover { color: var(--primary); }
.post-card p { color: var(--text-2); font-size: 16px; line-height: 1.75; }
.post-card .meta { color: var(--text-3); font-size: 13px; }

.article { padding: 60px 0 96px; }
.article .wrap { max-width: 840px; }
.article-body { display: flex; flex-direction: column; gap: 18px; font-size: 17px; line-height: 1.85; }
.article-body h2 { font-size: 27px; line-height: 1.35; margin-top: 26px; }
.article-body h3 { font-size: 20px; line-height: 1.45; margin-top: 8px; }
.article-body p, .article-body li { color: var(--text-2); }
.article-body ul, .article-body ol { margin: 0; padding-left: 24px; display: flex; flex-direction: column; gap: 8px; }
.article-body strong { color: var(--text); font-weight: 600; }
.table-scroll { overflow-x: auto; }
.article-body table { width: 100%; border-collapse: collapse; font-size: 15.5px; }
.article-body th, .article-body td {
  text-align: left; padding: 12px 14px; border: 1px solid var(--line);
  vertical-align: top; line-height: 1.6; color: var(--text-2); min-width: 130px;
}
.article-body th { background: var(--surface); color: var(--text); font-weight: 600; }
.note-box {
  padding: 18px 22px; border-left: 3px solid var(--primary);
  border-radius: 0 var(--r-btn) var(--r-btn) 0;
  background: var(--surface); color: var(--text-2); font-size: 15.5px; line-height: 1.75;
}
.article-cta {
  margin-top: 34px; display: flex; flex-direction: column; gap: 14px;
  padding: 30px 32px 34px; border-radius: var(--r-card); background: var(--navy-deep);
}
.article-cta h2 { color: var(--on-dark-1); font-size: 24px; line-height: 1.35; margin: 0; }
.article-cta p { color: var(--on-dark-2); font-size: 16px; line-height: 1.75; }
.article-foot {
  margin-top: 28px; padding-top: 18px; border-top: 1px solid var(--line);
  color: var(--text-3); font-size: 14px; line-height: 1.7;
}

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  :root { --pad: 32px; }
  .section { padding: 80px 0; }
  .h2 { font-size: 34px; }
  .hero h1 { font-size: 46px; }
  .hero .wrap { flex-direction: column; align-items: flex-start; gap: 48px; padding-top: 72px; padding-bottom: 80px; }
  .hero-shot { align-self: center; }
  .cards-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .split { flex-direction: column; align-items: flex-start; gap: 40px; }
  .split-reverse { flex-direction: column; }
  .split-shot { align-self: center; }
  .roadmap-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .price-head { flex-direction: column; }
  .free-card { flex: 1 1 auto; }
  .tiers { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .shot-pair { align-self: center; }
  .faq .wrap { flex-direction: column; gap: 32px; }
  .story { flex-direction: column; gap: 28px; }
  .story-side { flex: 1 1 auto; }
  .faq-head { flex: 1 1 auto; }

  /* 顶栏改两行：品牌 + 右侧一组在上，导航链接在下方独占一行、可横向滚动。
     窄屏不能直接隐藏链接——正文很长，没有跳转入口只能一路滚到页脚。 */
  .nav .wrap {
    height: auto; flex-wrap: wrap; gap: 10px 20px;
    padding-top: 12px; padding-bottom: 0;
  }
  .nav-links {
    order: 3; flex-basis: 100%; gap: 22px;
    overflow-x: auto; padding-bottom: 12px;
    scrollbar-width: none; -ms-overflow-style: none;
  }
  .nav-links::-webkit-scrollbar { display: none; }
  .section[id] { scroll-margin-top: 112px; }
}

@media (max-width: 720px) {
  :root { --pad: 20px; }
  body { font-size: 16px; }
  .section { padding: 56px 0; }
  .section[id] { scroll-margin-top: 104px; }
  .h2 { font-size: 28px; line-height: 1.32; }
  /* 顶栏在 375px 下的横向预算：品牌与右侧一组都不收缩，gap 必须跟着收 */
  .nav .wrap { gap: 8px 12px; }
  .nav-right { gap: 8px; }
  .lang-switch { padding: 0 6px; }
  .nav-cta { padding: 0 14px; font-size: 14px; }
  .brand span { font-size: 17px; }
  .nav-links { gap: 18px; }
  .tiers { grid-template-columns: 1fr; }
  /* .cta .h2 的特异性是 (0,2,0)，这里必须同样带 .cta 前缀才盖得住 */
  .cta h2, .cta .h2 { font-size: 28px; }
  .faq-head h2 { font-size: 26px; }
  .lede { font-size: 16px; }
  .hero h1 { font-size: 34px; }
  .hero .lede { font-size: 16px; }
  .hero .wrap { gap: 36px; padding-top: 48px; padding-bottom: 56px; }
  .hero-shot img { width: 250px; }
  .hero-shot::before { margin-left: -150px; width: 300px; height: 460px; }
  .store-row { flex-direction: column; align-self: stretch; }
  .store-btn { height: 52px; justify-content: center; }
  .rail .wrap { flex-direction: column; align-items: flex-start; gap: 12px; }
  .cards, .cards-3, .cards-2, .feature-grid { grid-template-columns: 1fr; gap: 12px; }
  .card { padding: 24px 22px 26px; gap: 12px; }
  .card h3 { font-size: 19px; }
  .card p { font-size: 15px; }
  .story { gap: 22px; }
  .story-side { gap: 14px; }
  .story-side h2 { font-size: 24px; }
  .story-body { gap: 14px; }
  .story-body p { font-size: 15px; line-height: 1.8; }
  .story-sign { font-size: 14px; gap: 10px; }
  .story-sign img { width: 42px; height: 42px; }
  .split-shot img { width: 250px; border-radius: 20px; }
  .shot-pair img { width: 46%; border-radius: 16px; }
  .shot-pair img + img { margin-top: 32px; }
  .mode { padding: 22px; flex-direction: column; gap: 12px; }
  .roadmap { padding: 24px 22px 26px; }
  .roadmap-grid { grid-template-columns: 1fr; gap: 14px; }
  .tier { padding: 24px 22px 26px; }
  .tier .amount b { font-size: 30px; }
  .pack { padding: 20px 22px; }
  .dark-card { padding: 22px 22px 24px; }
  .dark-card h3 { font-size: 17px; }
  .cta h2 { font-size: 28px; }
  .cta p { font-size: 16px; }
  .cta .wrap { align-items: stretch; }
  .cta .store-row { align-self: stretch; }
  .cta img.mark { align-self: center; }
  .foot-cols { gap: 28px 40px; }
  .foot-col a, .foot-col .title { min-height: 32px; display: flex; align-items: center; }
  .langs .wrap { gap: 26px; }
  .langs .head { align-items: flex-start; text-align: left; }
  .langs .chips { justify-content: flex-start; }
  .chips li { font-size: 14px; padding: 8px 14px; }
  .faq-item h3 { font-size: 17px; }
  .faq-item p { font-size: 15px; }
  .page-head h1 { font-size: 27px; }
  .page-head .wrap { padding-top: 36px; padding-bottom: 34px; }
  .blog-list { padding: 40px 0 64px; }
  .post-card { padding: 22px 20px 24px; }
  .post-card h2 { font-size: 19px; }
  .article { padding: 40px 0 64px; }
  .article-body { font-size: 16px; }
  .article-body h2 { font-size: 22px; margin-top: 16px; }
  .article-body h3 { font-size: 18px; }
  .article-cta { padding: 24px 22px 26px; }
  .article-cta h2 { font-size: 20px; }
}