/* 05-intro.css
   介绍页（intro.html）：暖橙氛围 + 档案纸感。桌面为主，向下兼容到 360px。 */

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Noto Sans SC", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, .metric {
  font-family: "Songti SC", "STSong", "Noto Serif SC", "SimSun", serif;
  letter-spacing: .4px;
}

h1, h2, h3, p, figure, ol, li { margin: 0; }
ol { padding: 0; list-style: none; }
img { max-width: 100%; }

a { color: inherit; text-decoration: none; }
a:focus-visible, button:focus-visible, input:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 3px;
  border-radius: var(--r-sm);
}

.wrap { width: min(100% - 40px, 1120px); margin-inline: auto; }
section { padding: 88px max(20px, calc((100% - 1120px) / 2)); }

/* ---------- buttons ---------- */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: var(--r-full);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: transform .18s var(--ease), box-shadow .18s var(--ease), background .18s var(--ease);
}
.button-primary {
  background: var(--primary);
  color: var(--on-primary);
  box-shadow: 0 8px 20px rgba(194,65,12,.24);
}
.button-primary:hover { transform: translateY(-1px); box-shadow: 0 12px 26px rgba(194,65,12,.3); }
.button-ghost {
  background: var(--surface);
  border-color: var(--line-strong);
  color: var(--ink);
}
.button-ghost:hover { transform: translateY(-1px); box-shadow: var(--s2); }
.button:disabled { opacity: .6; cursor: progress; transform: none; box-shadow: none; }

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 24px;
  width: min(100% - 40px, 1120px);
  margin: 0 auto;
  padding: 14px 0;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
}
@supports not (background: color-mix(in srgb, red 50%, blue)) {
  .site-header { background: var(--bg); }
}

.brand { display: inline-flex; align-items: center; gap: 10px; }
.brand-mark {
  display: grid;
  place-items: center;
  width: 36px; height: 36px;
  border-radius: 11px;
  background: linear-gradient(145deg, var(--ambient-top), var(--primary));
  color: #fff;
  font-family: "Songti SC", serif;
  font-size: 19px;
  box-shadow: 0 6px 14px rgba(194,65,12,.26);
}
.brand-copy { display: grid; line-height: 1.25; }
.brand-copy b { font-size: 16px; letter-spacing: .5px; }
.brand-copy small { color: var(--ink-3); font-size: 12px; }

.site-nav { display: flex; gap: 26px; margin-left: auto; font-size: 14px; color: var(--ink-2); }
.site-nav a:hover { color: var(--primary); }

.header-demo {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 38px;
  padding: 0 16px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-full);
  background: var(--surface);
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
}
.header-demo:hover { border-color: var(--primary); color: var(--primary); }

.lang-switch {
  flex: none;
  min-width: 44px;
  height: 30px;
  padding: 0 11px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-full);
  background: var(--surface);
  color: var(--ink-2);
  font: 600 12px/1 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  cursor: pointer;
  transition: border-color .18s var(--ease), color .18s var(--ease), background .18s var(--ease);
}
.lang-switch:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-soft); }

/* English copy runs longer than the Chinese source, so swap the serif display
   face for the UI sans and tighten the latin avatars. */
html[lang="en"] body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; }
html[lang="en"] h1,
html[lang="en"] h2,
html[lang="en"] h3,
html[lang="en"] .metric { font-family: inherit; letter-spacing: -.01em; }
html[lang="en"] .brand-copy b { letter-spacing: 0; }
html[lang="en"] .case-avatar { font-family: inherit; font-size: 13px; letter-spacing: .2px; }
html[lang="en"] .eyebrow,
html[lang="en"] .section-kicker,
html[lang="en"] .cta-badge { letter-spacing: .4px; }

/* ---------- hero ---------- */
.hero {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  align-items: center;
  gap: 56px;
  padding-top: 56px;
  padding-bottom: 72px;
  background:
    radial-gradient(120% 80% at 78% 0%, var(--ambient-soft) 0%, rgba(251,227,184,0) 60%),
    radial-gradient(90% 60% at 8% 0%, rgba(245,169,63,.22) 0%, rgba(245,169,63,0) 62%);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px 7px 12px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-full);
  background: var(--surface);
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
}
.eyebrow i { width: 7px; height: 7px; border-radius: 50%; background: var(--primary); }

.hero h1 {
  margin: 22px 0 18px;
  font-size: clamp(30px, 3.7vw, 47px);
  line-height: 1.22;
  font-weight: 700;
}
.hero h1 em {
  font-style: normal;
  color: var(--primary);
  background: linear-gradient(180deg, transparent 62%, var(--primary-soft) 62%);
}
.hero-lead { max-width: 33em; color: var(--ink-2); font-size: 17px; }

.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }

.hero-note {
  margin-top: 22px;
  padding-left: 12px;
  border-left: 2px solid var(--line-strong);
  color: var(--ink-3);
  font-size: 13px;
  max-width: 34em;
}
.hero-note span { color: var(--accent); font-weight: 600; }

/* phone stack */
.hero-product { position: relative; height: 560px; }
.product-halo {
  position: absolute;
  inset: 6% 2%;
  background: radial-gradient(closest-side, rgba(245,169,63,.42), rgba(245,169,63,0));
  filter: blur(26px);
}
.phone {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 224px;
  filter: drop-shadow(0 20px 32px rgba(41,34,25,.22));
  transition: transform .5s var(--ease);
}
.phone img { display: block; width: 100%; height: auto; border-radius: 26px; }
.phone-back  { transform: translate(-50%,-50%) translateX(-104px) rotate(-9deg) scale(.9); z-index: 1; }
.phone-mid   { transform: translate(-50%,-50%) translateX(104px) rotate(9deg) scale(.9); z-index: 2; }
.phone-front { transform: translate(-50%,-50%); z-index: 3; }

.float-chip {
  position: absolute;
  z-index: 4;
  padding: 9px 15px;
  border: 1px solid var(--line);
  border-radius: var(--r-full);
  background: var(--surface);
  box-shadow: var(--s2);
  color: var(--ink-2);
  font-size: 13px;
  white-space: nowrap;
}
.float-chip-a { top: 4%; left: 0; }
.float-chip-c { top: 18%; right: 0; }
.float-chip-d { bottom: 19%; left: 0; }
.float-chip-b { bottom: 5%; right: 0; }

/* ---------- shared section head ---------- */
.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px;
  margin-bottom: 34px;
}
.section-kicker {
  display: block;
  margin-bottom: 10px;
  color: var(--primary-ink);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 2px;
}
.section-head h2 { font-size: clamp(26px, 3vw, 36px); line-height: 1.3; }
.section-head p { max-width: 30em; color: var(--ink-3); font-size: 14px; }

/* ---------- value ---------- */
.value-section { background: linear-gradient(180deg, rgba(251,227,184,.34), rgba(251,227,184,0) 46%); }
.value-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.value-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 26px 22px 22px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--surface);
  box-shadow: var(--s2);
}
.metric { display: block; font-size: 42px; font-weight: 700; line-height: 1; }
.metric small { font-size: 20px; margin-left: 2px; }
.metric-up { color: var(--primary); }
.metric-down { color: var(--success); }
.value-card h3 { font-size: 17px; }
.value-card p { color: var(--ink-2); font-size: 14px; }
.metric-source {
  margin-top: auto;
  align-self: flex-start;
  padding: 5px 11px;
  border-radius: var(--r-full);
  background: var(--surface-2);
  color: var(--ink-3);
  font-size: 12px;
}

/* ---------- cases ---------- */
.case-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.case-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--surface);
  box-shadow: var(--s2);
}
.case-wide { grid-column: span 2; }
.case-head { display: flex; align-items: center; gap: 12px; }
.case-head h3 { font-size: 17px; line-height: 1.3; }
.case-head p { color: var(--ink-3); font-size: 13px; }
.case-avatar {
  display: grid;
  place-items: center;
  flex: none;
  width: 44px; height: 44px;
  border-radius: 13px;
  font-family: "Songti SC", serif;
  font-size: 19px;
  font-weight: 700;
}
.avatar-clay   { background: #F2E2D5; color: #8A4B2A; }
.avatar-amber  { background: var(--primary-soft); color: var(--primary); }
.avatar-rose   { background: #F6E2E5; color: #9C3B52; }
.avatar-teal   { background: #DEEAE6; color: #2C6357; }
.avatar-plum   { background: #F4E0DC; color: #8E3B34; }
.case-index { margin-left: auto; color: var(--ink-3); font-size: 11px; letter-spacing: 1.6px; }
.case-copy { color: var(--ink-2); font-size: 14px; }
.case-card footer {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-top: auto;
  padding-top: 14px;
  border-top: 1px dashed var(--line-strong);
  color: var(--ink-3);
  font-size: 13px;
}
.case-card footer b { color: var(--primary); font-family: "Songti SC", serif; font-size: 21px; }
.case-note { margin-top: 22px; text-align: center; color: var(--ink-3); font-size: 12px; }

/* ---------- workflow ---------- */
.workflow-section { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
/* 英文标签比中文宽约 1.5 倍：链路要放下 "Follow-up reminder" 一行需 ~736px，
   而「1fr 1fr」在 1120px 内容区只分得到 532px，硬排会把文案列压到 330px 以下。
   英文改为上下堆叠（文案整幅 + 链路整幅），标签保持一行；中文维持左右两栏。 */
html[lang="en"] .workflow-section { grid-template-columns: 1fr; gap: 32px; }
.workflow-copy h2 { margin: 0 0 16px; font-size: clamp(26px, 3vw, 36px); line-height: 1.3; }
.workflow-copy p { max-width: 30em; color: var(--ink-2); }
.flow-caps { grid-column: 1 / -1; display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin: 6px 0 0; padding: 0; list-style: none; }
.flow-caps li { display: grid; gap: 6px; align-content: start; padding: 16px 18px; border: 1px solid var(--line); border-radius: var(--r-lg); background: var(--surface); }
.flow-caps-ico { display: grid; place-items: center; width: 30px; height: 30px; margin-bottom: 2px; border-radius: 50%; background: var(--primary-soft); color: var(--primary); }
.flow-caps-ico svg { width: 17px; height: 17px; }
.flow-caps b { font-size: 15px; }
.flow-caps p { margin: 0; font-size: 12.5px; line-height: 1.5; color: var(--ink-3); }
.text-link { display: inline-block; margin-top: 18px; color: var(--primary-ink); font-weight: 600; }
.text-link:hover { text-decoration: underline; }
/* 经营闭环：客户链路 01→02→03，右轨下行，06←05←04，左轨「回流」回到 01
   手机 = 竖排链路 + 左轨；≥760px = 3+3 的 S 形闭环（同报表「客户循环」形式，不带数据） */
.flow-chain { position: relative; display: grid; gap: 10px; padding-left: 46px; }
.flow-chain::before { content: ''; position: absolute; left: 12px; top: 34px; bottom: 34px; width: 2px; border-radius: 2px; background: var(--line-strong); }
.flow-chain::after { content: ''; position: absolute; left: 8px; top: 29px; border-left: 5px solid transparent; border-right: 5px solid transparent; border-bottom: 7px solid var(--line-strong); }
.flow-step { position: relative; display: flex; align-items: baseline; gap: 9px; min-height: 54px; padding: 15px 18px; border: 1px solid var(--line); border-radius: var(--r-lg); background: var(--surface); }
.flow-step:not(.n1)::before, .flow-hub::before { content: ''; position: absolute; left: 50%; top: -10px; width: 2px; height: 10px; margin-left: -1px; background: var(--line-strong); }
.flow-step:not(.n1)::after, .flow-hub::after { content: ''; position: absolute; left: 50%; top: -1px; margin-left: -4px; border-left: 4px solid transparent; border-right: 4px solid transparent; border-top: 6px solid var(--line-strong); }
.flow-step > span { flex: none; font-family: "Songti SC", serif; font-size: 19px; line-height: 1.2; color: var(--primary-ink); }
/* 不能写死 flex:none —— 英文标签最宽到 "Follow-up reminder"，会顶破 1fr 的
   min-content 下限把整页撑出横向滚动；可收缩后标签按需换行，桌面宽度仍是一行。 */
.flow-step b { flex: 1 1 auto; font-size: 16px; }

.flow-ai { display: inline-block; vertical-align: 1px; margin-right: 5px; padding: 1px 7px; border-radius: 999px; background: var(--primary-soft); color: var(--primary); font-size: 11px; font-style: normal; font-weight: 600; white-space: nowrap; }
.flow-hub {
  position: relative; display: inline-flex; flex-direction: column; align-items: center; gap: 1px;
  width: fit-content; margin: 2px auto; padding: 12px 24px; box-shadow: var(--s2);
  border: 1px solid color-mix(in srgb, var(--primary) 32%, transparent);
  border-radius: var(--r-lg);
  background: var(--primary-soft);
}
.flow-hub b { font-size: 15px; color: var(--primary-ink); white-space: nowrap; }
.flow-hub span { font-size: 11px; color: color-mix(in srgb, var(--primary-ink) 65%, var(--ink-2)); white-space: nowrap; }

.flow-link, .flow-rail { display: none; }
.flow-back-label { position: absolute; left: 20px; top: 50%; transform: translateY(-50%); font-style: normal; font-size: 12px; color: var(--ink-3); white-space: nowrap; }

@media (min-width: 760px) {
  .flow-chain { grid-template-columns: 1fr 44px 1fr 44px 1fr; grid-template-rows: auto 92px auto; gap: 0; padding-left: 0; }
  .flow-chain::before, .flow-chain::after { display: none; }

  .flow-step.n1 { grid-area: 1 / 1; }
  .flow-step.n2 { grid-area: 1 / 3; }
  .flow-step.n3 { grid-area: 1 / 5; }
  .flow-step.n4 { grid-area: 3 / 5; }
  .flow-step.n5 { grid-area: 3 / 3; }
  .flow-step.n6 { grid-area: 3 / 1; }
  .flow-link { display: block; position: relative; align-self: center; height: 2px; border-radius: 2px; background: var(--line-strong); }
  .flow-link::after { content: ''; position: absolute; top: -3px; border-top: 4px solid transparent; border-bottom: 4px solid transparent; }
  .flow-link.a1 { grid-area: 1 / 2; }
  .flow-link.a2 { grid-area: 1 / 4; }
  .flow-link.a3 { grid-area: 3 / 4; }
  .flow-link.a4 { grid-area: 3 / 2; }
  .flow-link.a1::after, .flow-link.a2::after { right: 0; border-left: 6px solid var(--line-strong); }
  .flow-link.a3::after, .flow-link.a4::after { left: 0; border-right: 6px solid var(--line-strong); }
  .flow-rail { display: block; position: relative; width: 2px; height: 100%; border-radius: 2px; background: var(--line-strong); justify-self: center; }
  .flow-hub { grid-area: 2 / 3; justify-self: center; align-self: center; z-index: 1; margin: 0; }
  .flow-hub::before, .flow-hub::after { display: none; }
  .flow-step:not(.n1)::before, .flow-step:not(.n1)::after { display: none; }
  .flow-hub span { white-space: nowrap; }
  .flow-rail.down { grid-area: 2 / 5; }
  .flow-rail.up { grid-area: 2 / 1; }
  .flow-rail.down::after { content: ''; position: absolute; bottom: -1px; left: -4px; border-left: 5px solid transparent; border-right: 5px solid transparent; border-top: 7px solid var(--line-strong); }
  .flow-rail.up::after { content: ''; position: absolute; top: -1px; left: -4px; border-left: 5px solid transparent; border-right: 5px solid transparent; border-bottom: 7px solid var(--line-strong); }
  .flow-back-label { position: static; grid-area: 2 / 1; justify-self: center; align-self: center; margin-left: 32px; }
}

/* ---------- cta + waitlist ---------- */
.cta-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 44px;
  align-items: center;
  width: min(100% - 40px, 1120px);
  margin: 0 auto 88px;
  padding: 44px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-xl);
  background:
    radial-gradient(120% 130% at 0% 0%, var(--ambient-soft), rgba(251,227,184,0) 62%),
    var(--surface);
  box-shadow: var(--s3);
}
.cta-badge {
  display: inline-block;
  margin-bottom: 14px;
  padding: 6px 13px;
  border-radius: var(--r-full);
  background: var(--primary);
  color: var(--on-primary);
  font-size: 12px;
  font-weight: 600;
}
.cta-copy h2 { margin-bottom: 14px; font-size: clamp(26px, 3vw, 34px); line-height: 1.3; }
.cta-copy p { color: var(--ink-2); font-size: 15px; }

.waitlist-form { display: grid; gap: 10px; }
.waitlist-form label { font-size: 13px; font-weight: 600; color: var(--ink-2); }
.phone-input {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 52px;
  padding: 0 16px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-md);
  background: #fff;
  transition: border-color .18s var(--ease), box-shadow .18s var(--ease);
}
.phone-input:focus-within { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft); }
.phone-input.has-error { border-color: var(--danger); box-shadow: 0 0 0 3px var(--danger-soft); }
.phone-input > span { color: var(--ink-3); font-size: 15px; }
.phone-input input {
  flex: 1;
  min-width: 0;
  border: 0;
  background: transparent;
  color: var(--ink);
  font-size: 16px;
  letter-spacing: .5px;
}
.phone-input input:focus { outline: none; }
.phone-input input::placeholder { color: var(--ink-3); letter-spacing: 0; }
.form-error { min-height: 18px; color: var(--danger); font-size: 12px; }
.submit-button { width: 100%; }
.form-privacy { color: var(--ink-3); font-size: 12px; }
.form-success {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border: 1px solid var(--success);
  border-radius: var(--r-md);
  background: var(--success-soft);
}
.form-success[hidden] { display: none; }
.success-mark {
  display: grid;
  place-items: center;
  flex: none;
  width: 30px; height: 30px;
  border-radius: 50%;
  background: var(--success);
  color: #fff;
  font-size: 16px;
}
.form-success b { font-size: 15px; }
.form-success p { color: var(--ink-2); font-size: 13px; }

/* ---------- footer ---------- */
.site-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 24px;
  width: min(100% - 40px, 1120px);
  margin: 0 auto;
  padding: 30px 0 44px;
  border-top: 1px solid var(--line);
  color: var(--ink-3);
  font-size: 13px;
}
.site-footer > p { margin-left: auto; }

/* ---------- reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity .6s var(--ease) var(--reveal-delay, 0ms),
    transform .6s var(--ease) var(--reveal-delay, 0ms);
}
.reveal.is-visible { opacity: 1; transform: none; }

/* ---------- responsive ---------- */
@media (max-width: 960px) {
  section { padding-block: 64px; }
  .site-nav { display: none; }
  .header-demo { margin-left: auto; }
  .hero { grid-template-columns: 1fr; gap: 40px; padding-top: 36px; }
  .hero-product { width: 100%; height: 440px; max-width: 520px; margin-inline: auto; }
  .phone { width: 168px; }
  .phone-back { transform: translate(-50%,-50%) translateX(-74px) rotate(-9deg) scale(.9); }
  .phone-mid  { transform: translate(-50%,-50%) translateX(74px) rotate(9deg) scale(.9); }
  .float-chip-a { top: 3%; left: 0; }
  .float-chip-c { top: 16%; right: 0; }
  .float-chip-d { bottom: 17%; left: 0; }
  .float-chip-b { bottom: 3%; right: 0; }
  .section-head { flex-direction: column; align-items: flex-start; gap: 12px; }
  .value-grid { grid-template-columns: repeat(2, 1fr); }
  .case-grid { grid-template-columns: 1fr; }
  .case-wide { grid-column: span 1; }
  .workflow-section { grid-template-columns: 1fr; gap: 32px; }
  .cta-section { grid-template-columns: 1fr; gap: 28px; padding: 32px 24px; margin-bottom: 64px; }
}

@media (max-width: 960px) {
  .flow-caps { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 560px) {
  .flow-caps { grid-template-columns: 1fr; gap: 12px; }
  .wrap, .site-header, .site-footer { width: calc(100% - 32px); }
  section { padding-block: 52px; }
  .brand-copy small { display: none; }
  .header-demo { min-height: 40px; padding: 0 14px; font-size: 13px; }
  .lang-switch { min-width: 44px; height: 40px; padding: 0 12px; font-size: 12px; }
  .hero h1 { font-size: 31px; }
  .hero-lead { font-size: 15px; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .button { width: 100%; }
  .hero-note { font-size: 12px; }
  .hero-product { height: 380px; }
  .phone { width: 142px; }
  .phone-back { transform: translate(-50%,-50%) translateX(-60px) rotate(-9deg) scale(.9); }
  .phone-mid  { transform: translate(-50%,-50%) translateX(60px) rotate(9deg) scale(.9); }
  .float-chip { font-size: 12px; padding: 7px 12px; }
  .float-chip-a { top: 1%; left: 0; }
  .float-chip-c { top: 15%; right: 0; }
  .float-chip-d { bottom: 15%; left: 0; }
  .float-chip-b { bottom: 1%; right: 0; }
  .value-grid { grid-template-columns: 1fr; }
  .metric { font-size: 36px; }
  .site-footer > p { margin-left: 0; width: 100%; }
}

/* ≤360px：英文文案更长，品牌只留标识、按钮再收窄，避免 EN 挤出视口 */
@media (max-width: 360px) {
  .site-header { gap: 12px; }
  .brand-copy b { font-size: 14px; }
  .header-demo { padding: 0 10px; font-size: 12.5px; }
  .lang-switch { min-width: 40px; padding: 0 9px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .phone, .button { transition: none; }
}