/* ==========================================================================
   以买邮 ManyMail — 官网样式（浅色主题）
   纯静态、零依赖、无外链字体，保证首屏速度（SEO / Core Web Vitals）
   ========================================================================== */

:root {
  --bg: #ffffff;
  --bg-soft: #f6f8fc;
  --bg-elev: #ffffff;
  --card: #ffffff;
  --card-hover: #f8faff;
  --line: #e6eaf3;
  --line-strong: #d3dbea;
  --text: #101828;
  --text-dim: #475467;
  --text-mute: #6b7791;
  --brand: #3b63f0;
  --brand-2: #7c3aed;
  --accent: #0e7490;
  --ok: #0e9f6e;
  --warn: #b45309;
  --grad: linear-gradient(120deg, #3b63f0 0%, #7c3aed 52%, #0891b2 100%);
  --grad-soft: linear-gradient(120deg, rgba(59, 99, 240, 0.09), rgba(124, 58, 237, 0.09));
  --radius: 18px;
  --radius-lg: 26px;
  --maxw: 1160px;
  --nav-h: 68px;
  --shadow: 0 28px 64px -34px rgba(16, 24, 40, 0.28);
  --font: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Segoe UI",
    system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 16px);
  -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;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; border: 0; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; }

h1, h2, h3, h4 {
  margin: 0 0 0.6em;
  line-height: 1.22;
  letter-spacing: -0.02em;
  font-weight: 800;
  text-wrap: balance;
}

p { margin: 0 0 1em; }
ul, ol { margin: 0; padding: 0; list-style: none; }

::selection { background: rgba(59, 99, 240, 0.16); }

/* ---------- 布局 ---------- */
.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

section { position: relative; }

.sec {
  padding: 96px 0;
}

.sec-head {
  max-width: 720px;
  margin: 0 auto 56px;
  text-align: center;
}

.sec-head h2 {
  font-size: clamp(1.75rem, 3.6vw, 2.6rem);
  margin-bottom: 14px;
}

.sec-head p {
  color: var(--text-dim);
  font-size: 1.06rem;
  margin: 0;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 18px;
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--accent);
  opacity: 0.7;
}

.grad-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- 导航 ---------- */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--nav-h);
  z-index: 90;
  display: flex;
  align-items: center;
  transition: background 0.25s ease, border-color 0.25s ease, backdrop-filter 0.25s;
  border-bottom: 1px solid transparent;
}

.nav.scrolled {
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(14px) saturate(160%);
  border-bottom-color: var(--line);
}

.nav .wrap {
  display: flex;
  align-items: center;
  gap: 28px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.06rem;
  letter-spacing: -0.01em;
  flex-shrink: 0;
}

.logo-mark {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: var(--grad);
  display: grid;
  place-items: center;
  box-shadow: 0 8px 18px -8px rgba(59, 99, 240, 0.75);
}

.logo-mark svg { width: 19px; height: 19px; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 26px;
  margin-left: 8px;
}

.nav-links a {
  font-size: 0.93rem;
  color: var(--text-dim);
  transition: color 0.18s;
  white-space: nowrap;
}

.nav-links a:hover { color: var(--brand); }

.nav-right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 12px;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.84rem;
  color: var(--text-dim);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 5px 12px;
  transition: 0.18s;
  background: #fff;
  cursor: pointer;
}

.lang-switch:hover {
  color: var(--brand);
  border-color: rgba(59, 99, 240, 0.45);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 44px;
  padding: 0 22px;
  border-radius: 12px;
  font-size: 0.95rem;
  font-weight: 700;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.16s ease, box-shadow 0.2s ease, background 0.2s, border-color 0.2s;
  white-space: nowrap;
}

.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--grad);
  color: #fff;
  box-shadow: 0 12px 26px -14px rgba(59, 99, 240, 0.85);
}

.btn-primary:hover {
  box-shadow: 0 16px 32px -14px rgba(59, 99, 240, 0.95);
  transform: translateY(-1px);
}

.btn-ghost {
  background: #fff;
  border-color: var(--line-strong);
  color: var(--text);
}

.btn-ghost:hover {
  background: #f6f8fc;
  border-color: rgba(59, 99, 240, 0.4);
  color: var(--brand);
}

.btn-lg { height: 52px; padding: 0 30px; font-size: 1rem; border-radius: 14px; }
.btn-sm { height: 38px; padding: 0 16px; font-size: 0.88rem; border-radius: 10px; }

.btn[disabled] { opacity: 0.45; pointer-events: none; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: calc(var(--nav-h) + 84px) 0 96px;
  overflow: hidden;
  background: linear-gradient(180deg, #f7f9ff 0%, #ffffff 62%);
}

.hero::before {
  content: "";
  position: absolute;
  top: -260px;
  left: 50%;
  transform: translateX(-50%);
  width: 1100px;
  height: 700px;
  background: radial-gradient(circle at 50% 40%, rgba(59, 99, 240, 0.16), transparent 62%),
    radial-gradient(circle at 72% 30%, rgba(124, 58, 237, 0.12), transparent 58%);
  filter: blur(30px);
  pointer-events: none;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(16, 24, 40, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(16, 24, 40, 0.045) 1px, transparent 1px);
  background-size: 62px 62px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 20%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 20%, transparent 78%);
  pointer-events: none;
}

.hero .wrap { position: relative; z-index: 2; }

.hero-inner {
  max-width: 860px;
  margin: 0 auto;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 7px 15px 7px 9px;
  border-radius: 999px;
  background: #fff;
  border: 1px solid var(--line-strong);
  box-shadow: 0 2px 10px -4px rgba(16, 24, 40, 0.12);
  font-size: 0.83rem;
  color: var(--text-dim);
  margin-bottom: 26px;
}

.hero-badge i {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--grad);
  display: grid;
  place-items: center;
  font-style: normal;
  font-size: 0.7rem;
  color: #fff;
}

.hero h1 {
  font-size: clamp(2.3rem, 5.6vw, 4.1rem);
  line-height: 1.12;
  letter-spacing: -0.035em;
  margin-bottom: 22px;
}

.hero-sub {
  font-size: clamp(1rem, 1.6vw, 1.18rem);
  color: var(--text-dim);
  max-width: 660px;
  margin: 0 auto 34px;
  line-height: 1.75;
}

.hero-cta {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.hero-note {
  font-size: 0.84rem;
  color: var(--text-mute);
  margin: 0;
}

/* 信任条 */
.trust {
  margin-top: 64px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.trust-item {
  background: #fff;
  padding: 22px 18px;
  text-align: center;
}

.trust-item b {
  display: block;
  font-size: clamp(1.45rem, 2.6vw, 1.9rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.trust-item span {
  font-size: 0.82rem;
  color: var(--text-mute);
}

/* ---------- 产品 Mock ---------- */
.showcase {
  margin-top: 76px;
  position: relative;
}

.mock {
  border: 1px solid var(--line-strong);
  border-radius: 20px;
  background: #fff;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.mock-bar {
  height: 42px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 16px;
  border-bottom: 1px solid var(--line);
  background: #f7f9fd;
}

.mock-dot { width: 10px; height: 10px; border-radius: 50%; background: #cbd5e1; }
.mock-dot:nth-child(1) { background: #ff5f57; }
.mock-dot:nth-child(2) { background: #febc2e; }
.mock-dot:nth-child(3) { background: #28c840; }

.mock-title {
  margin-left: 10px;
  font-size: 0.78rem;
  color: var(--text-mute);
  font-family: var(--mono);
}

.mock-body {
  display: grid;
  grid-template-columns: 268px 1fr;
  min-height: 396px;
}

.mock-list {
  border-right: 1px solid var(--line);
  padding: 12px 10px;
  background: #fafcff;
}

.mock-search {
  height: 32px;
  border-radius: 8px;
  background: #fff;
  border: 1px solid var(--line);
  display: flex;
  align-items: center;
  padding: 0 10px;
  font-size: 0.74rem;
  color: var(--text-mute);
  margin-bottom: 12px;
}

.mock-row {
  display: flex;
  gap: 10px;
  padding: 10px 9px;
  border-radius: 10px;
  align-items: flex-start;
  cursor: default;
}

.mock-row.active { background: rgba(59, 99, 240, 0.08); }

.mock-avatar {
  width: 30px;
  height: 30px;
  border-radius: 9px;
  flex-shrink: 0;
  display: grid;
  place-items: center;
  font-size: 0.72rem;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, #4f7cff, #8b5cf6);
}

.mock-row:nth-child(3) .mock-avatar { background: linear-gradient(135deg, #22d3ee, #3b82f6); }
.mock-row:nth-child(4) .mock-avatar { background: linear-gradient(135deg, #34d399, #10b981); }
.mock-row:nth-child(5) .mock-avatar { background: linear-gradient(135deg, #f59e0b, #ef4444); }

.mock-row-txt { min-width: 0; flex: 1; }

.mock-row-txt b {
  display: block;
  font-size: 0.79rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.mock-row-txt span {
  display: block;
  font-size: 0.72rem;
  color: var(--text-mute);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.mock-chat {
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: #fff;
}

.mock-chip {
  align-self: center;
  font-size: 0.68rem;
  color: var(--text-mute);
  background: #eef2f9;
  border-radius: 999px;
  padding: 3px 12px;
}

.bubble {
  max-width: 78%;
  padding: 11px 15px;
  border-radius: 14px;
  font-size: 0.83rem;
  line-height: 1.6;
}

.bubble.them {
  background: #f4f7fc;
  border: 1px solid var(--line);
  border-bottom-left-radius: 5px;
  align-self: flex-start;
  color: var(--text);
}

.bubble.me {
  background: linear-gradient(135deg, #4f7cff, #8b5cf6);
  color: #fff;
  border-bottom-right-radius: 5px;
  align-self: flex-end;
}

.bubble small {
  display: block;
  opacity: 0.62;
  font-size: 0.68rem;
  margin-top: 5px;
}

.mock-tag {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.7rem;
  color: var(--ok);
  background: rgba(14, 159, 110, 0.09);
  border: 1px solid rgba(14, 159, 110, 0.24);
  border-radius: 999px;
  padding: 4px 11px;
}

.mock-tag i { width: 6px; height: 6px; border-radius: 50%; background: var(--ok); }

/* ---------- 功能 ---------- */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 24px;
  transition: background 0.22s, border-color 0.22s, transform 0.22s, box-shadow 0.22s;
  position: relative;
  overflow: hidden;
  box-shadow: 0 1px 2px rgba(16, 24, 40, 0.04);
}

.card:hover {
  background: var(--card-hover);
  border-color: rgba(59, 99, 240, 0.28);
  transform: translateY(-2px);
  box-shadow: 0 14px 34px -22px rgba(16, 24, 40, 0.35);
}

.card.span-2 { grid-column: span 2; }

.card-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  margin-bottom: 16px;
  background: var(--grad-soft);
  border: 1px solid rgba(59, 99, 240, 0.18);
}

.card-icon svg { width: 21px; height: 21px; stroke: var(--brand); }

.card h3 {
  font-size: 1.12rem;
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}

.card p {
  color: var(--text-dim);
  font-size: 0.93rem;
  margin: 0;
  line-height: 1.72;
}

.card ul.ticks {
  margin-top: 14px;
  display: grid;
  gap: 7px;
}

.card ul.ticks li {
  position: relative;
  padding-left: 20px;
  font-size: 0.86rem;
  color: var(--text-dim);
}

.card ul.ticks li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 9px;
  height: 9px;
  border-radius: 3px;
  background: linear-gradient(135deg, var(--brand), var(--accent));
  opacity: 0.9;
}

/* 大数字带 */
.stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  margin-top: 18px;
}

.stat {
  text-align: center;
  padding: 26px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--card);
}

.stat b {
  display: block;
  font-size: clamp(1.5rem, 3vw, 2.05rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 4px;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.stat span { font-size: 0.84rem; color: var(--text-mute); }

/* ---------- 场景 ---------- */
.usecases {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.usecase {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px 18px;
  background: var(--card);
  transition: 0.2s;
}

.usecase:hover {
  border-color: rgba(59, 99, 240, 0.28);
  background: var(--card-hover);
}

.usecase b { display: block; font-size: 0.96rem; margin-bottom: 5px; }
.usecase span { font-size: 0.83rem; color: var(--text-mute); line-height: 1.6; }

/* ---------- 下载 ---------- */
.download {
  background: linear-gradient(180deg, transparent, rgba(59, 99, 240, 0.045) 40%, transparent);
}

.dl-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.dl-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  padding: 22px 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: 0.2s;
  position: relative;
  box-shadow: 0 1px 2px rgba(16, 24, 40, 0.04);
}

.dl-card:hover {
  border-color: rgba(59, 99, 240, 0.4);
  box-shadow: 0 18px 40px -26px rgba(16, 24, 40, 0.4);
}

.dl-top { display: flex; align-items: center; gap: 11px; }

.dl-os {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: #f2f5fb;
  border: 1px solid var(--line);
  display: grid;
  place-items: center;
  flex-shrink: 0;
}

.dl-os svg { width: 19px; height: 19px; fill: #5b6883; }

.dl-name { font-weight: 700; font-size: 0.98rem; }
.dl-meta { font-size: 0.74rem; color: var(--text-mute); font-family: var(--mono); }

.dl-badge {
  align-self: flex-start;
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 3px 9px;
  border-radius: 999px;
  background: rgba(59, 99, 240, 0.09);
  border: 1px solid rgba(59, 99, 240, 0.26);
  color: var(--brand);
  margin-bottom: -2px;
}

.dl-desc { font-size: 0.83rem; color: var(--text-dim); line-height: 1.62; flex: 1; }

.dl-qr {
  display: flex;
  align-items: center;
  gap: 11px;
  padding-top: 12px;
  border-top: 1px dashed var(--line-strong);
}

.dl-qr img {
  width: 74px;
  height: 74px;
  border-radius: 8px;
  background: #fff;
  border: 1px solid var(--line);
  padding: 4px;
  object-fit: contain;
}

.dl-qr-txt { font-size: 0.74rem; color: var(--text-mute); line-height: 1.5; }

.dl-empty {
  font-size: 0.76rem;
  color: var(--text-mute);
  padding: 8px 0 0;
}

/* ---------- FAQ ---------- */
.faq {
  max-width: 840px;
  margin: 0 auto;
  border-top: 1px solid var(--line);
}

.faq details {
  border-bottom: 1px solid var(--line);
}

.faq summary {
  list-style: none;
  cursor: pointer;
  padding: 22px 40px 22px 0;
  font-weight: 650;
  font-size: 1.01rem;
  position: relative;
  transition: color 0.18s;
}

.faq summary::-webkit-details-marker { display: none; }

.faq summary:hover { color: var(--brand); }

.faq summary::after {
  content: "";
  position: absolute;
  right: 6px;
  top: 50%;
  width: 9px;
  height: 9px;
  border-right: 2px solid var(--text-mute);
  border-bottom: 2px solid var(--text-mute);
  transform: translateY(-70%) rotate(45deg);
  transition: transform 0.22s;
}

.faq details[open] summary::after {
  transform: translateY(-30%) rotate(-135deg);
}

.faq .ans {
  padding: 0 40px 22px 0;
  color: var(--text-dim);
  font-size: 0.94rem;
  line-height: 1.78;
}

.faq .ans p:last-child { margin-bottom: 0; }

/* ---------- CTA ---------- */
.cta {
  position: relative;
  padding: 76px 0;
}

.cta-box {
  position: relative;
  border: 1px solid rgba(59, 99, 240, 0.22);
  border-radius: var(--radius-lg);
  padding: 58px 40px;
  text-align: center;
  overflow: hidden;
  background: radial-gradient(circle at 50% 0%, rgba(59, 99, 240, 0.1), transparent 62%),
    linear-gradient(180deg, #fbfcff, #f7f9ff);
}

.cta-box h2 {
  font-size: clamp(1.7rem, 3.4vw, 2.4rem);
  margin-bottom: 14px;
}

.cta-box p {
  color: var(--text-dim);
  max-width: 560px;
  margin: 0 auto 30px;
}

/* ---------- 页脚 ---------- */
.footer {
  border-top: 1px solid var(--line);
  padding: 60px 0 34px;
  background: #f7f9fc;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 44px;
}

.footer-brand p {
  color: var(--text-mute);
  font-size: 0.87rem;
  line-height: 1.7;
  max-width: 330px;
  margin-top: 14px;
}

.footer h4 {
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-mute);
  font-weight: 700;
  margin-bottom: 16px;
}

.footer li { margin-bottom: 10px; }

.footer li a,
.footer li span {
  font-size: 0.88rem;
  color: var(--text-dim);
  transition: color 0.18s;
}

.footer li a:hover { color: var(--brand); }

.footer-bottom {
  border-top: 1px solid var(--line);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 0.8rem;
  color: var(--text-mute);
}

.footer-bottom a { color: var(--text-mute); }
.footer-bottom a:hover { color: var(--brand); }

/* ---------- 滚动动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s cubic-bezier(0.22, 1, 0.36, 1), transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

.reveal.in { opacity: 1; transform: none; }

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

/* ---------- 语言切换过渡 ---------- */
html.lang-redirect body { opacity: 0; transition: opacity 0.25s ease; }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .nav-links { display: none; }
  .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .card.span-2 { grid-column: span 2; }
  .usecases { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .dl-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .mock-body { grid-template-columns: 220px 1fr; }
}

@media (max-width: 720px) {
  :root { --nav-h: 60px; }
  .sec { padding: 64px 0; }
  .hero { padding: calc(var(--nav-h) + 52px) 0 64px; }
  .wrap { padding: 0 18px; }
  .trust { grid-template-columns: repeat(2, minmax(0, 1fr)); margin-top: 44px; }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .card.span-2 { grid-column: span 1; }
  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .usecases { grid-template-columns: 1fr; }
  .dl-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .mock-body { grid-template-columns: 1fr; }
  .mock-list { display: none; }
  .mock-chat { min-height: 300px; }
  /* 移动端保留「登录」入口，只收起 logo 的英文副名与导航锚点 */
  .nav .wrap { gap: 10px; }
  .logo-alt { display: none; }
  .nav-right { gap: 8px; }
  .nav-right .btn-sm { height: 34px; padding: 0 12px; font-size: 0.82rem; }
  .lang-switch { padding: 4px 9px; font-size: 0.8rem; }
  .hero-cta .btn { width: 100%; }
  .cta-box { padding: 40px 22px; }
  .bubble { max-width: 88%; }
}