/* =========================================================
   MSFTP · 独立开发者全栈交付 —— 展示站样式
   设计稿还原：桌面 1440 / 移动 390
   ========================================================= */

:root {
  /* 颜色 */
  --ink: #14202B;          /* 主文字 */
  --brand: #1E6F5C;        /* 强调色（唯一） */
  --brand-tint: #EDF5F2;   /* 浅绿底 */
  --muted-bg: #F6F7F8;     /* 中性底 */
  --text-2: #5C6773;       /* 次要文字 */
  --placeholder: #9AA4AD;  /* 占位文字 */
  --line: #E3E8ED;         /* 卡片 / 分隔描边 */
  --line-input: #DEE3E8;   /* 输入框描边 */
  --tag-bg: #F2F4F3;       /* 标签底 */
  --footer-text: #AEBEC4;  /* 页脚正文 */
  --footer-dim: #8C9BA3;   /* 页脚弱化 */
  --footer-line: #26333E;  /* 页脚分隔线 */

  /* 字体 */
  --font-sans: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "PingFang SC",
               "Microsoft YaHei", "Hiragino Sans GB", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas,
               "Liberation Mono", monospace;

  /* 间距（8px 基准栅格） */
  --sp-1: 4px;  --sp-2: 8px;  --sp-3: 12px; --sp-4: 16px;
  --sp-5: 20px; --sp-6: 24px; --sp-7: 28px; --sp-8: 32px;
  --sp-11: 44px; --sp-9: 36px; --sp-12: 48px; --sp-16: 64px; --sp-22: 88px;

  /* 圆角 */
  --r-sm: 6px; --r-md: 8px; --r-lg: 10px; --r-xl: 12px; --r-2xl: 14px; --r-3xl: 16px;

  --shadow-card: 0 12px 32px -6px rgba(8, 31, 41, .06);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  color: var(--ink);
  background: #FFFFFF;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, p { margin: 0; }

img, svg { display: block; max-width: 100%; }

a { color: inherit; text-decoration: none; }

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

.container {
  width: 100%;
  max-width: 1440px;
  margin: 0 auto;
  padding-left: 80px;
  padding-right: 80px;
}

/* ---------------- 按钮 ---------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid transparent;
  border-radius: var(--r-lg);
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 500;
  line-height: 1;
  cursor: pointer;
  white-space: nowrap;
  transition: background-color .18s ease, border-color .18s ease,
              transform .18s ease, box-shadow .18s ease;
}
.btn--primary { background: var(--brand); color: #FFFFFF; }
.btn--primary:hover { background: #185B4B; transform: translateY(-1px); }
.btn--ghost {
  background: #FFFFFF;
  color: var(--ink);
  border-color: var(--line);
  font-weight: 500;
}
.btn--ghost:hover { border-color: #CBD3DA; background: #FAFBFB; }
.btn--light { background: #FFFFFF; color: var(--ink); font-weight: 600; }
.btn--light:hover { background: #EEF2F1; }
.btn--sm { padding: 11px 22px; font-size: 14px; font-weight: 600; }
.btn--block { width: 100%; height: 50px; font-size: 15px; font-weight: 600; }
.btn[disabled] { opacity: .62; cursor: progress; transform: none; box-shadow: none; }
.btn--primary[disabled]:hover { background: var(--brand); transform: none; }
/* 内容未变化导致的禁用（非加载中），光标用 not-allowed 与「提交中」区分 */
.btn--primary.is-noop[disabled] { cursor: not-allowed; }

/* ---------------- Header ---------------- */
.header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: 72px;
  background: #FFFFFF;
  border-bottom: 1px solid var(--line);
  transition: box-shadow .2s ease;
}
.header.is-scrolled { box-shadow: 0 2px 12px rgba(20, 32, 43, .06); }

.header__inner {
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo { display: flex; align-items: center; gap: 12px; }
.logo__mark { display: flex; }
.logo__word {
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: .01em;
}
.logo__tag { font-size: 13px; font-weight: 400; color: var(--text-2); }

.nav { display: flex; align-items: center; gap: 36px; }
.nav a {
  font-size: 14px;
  font-weight: 500;
  color: var(--ink);
  transition: color .18s ease;
}
.nav a:hover { color: var(--brand); }

/* ---------------- Hero ---------------- */
.hero { padding: 88px 0 72px; background: #FFFFFF; }
.hero__inner {
  display: flex;
  align-items: center;
  gap: 64px;
}
.hero__text {
  width: 600px;
  flex: 0 0 600px;
  display: flex;
  flex-direction: column;
  gap: 26px;
}

.badge {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  border-radius: 100px;
  background: var(--brand-tint);
  font-size: 13px;
  font-weight: 500;
  color: var(--brand);
}
.badge__dot { display: flex; }

.hero__title {
  font-size: 46px;
  line-height: 58px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -.01em;
}
.hero__sub {
  font-size: 17px;
  line-height: 30px;
  font-weight: 400;
  color: var(--text-2);
}

.hero__cta { display: flex; align-items: center; gap: 14px; }
.hero__cta .btn--primary { padding: 15px 26px; font-weight: 600; }
.hero__cta .btn--ghost { padding: 14px 26px; }

.hero__trust { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.hero__trust span { font-size: 13px; font-weight: 400; color: var(--text-2); }

.hero__visual { flex: 0 0 520px; }
.hero__visual svg { width: 520px; height: 420px; }

/* ---------------- Stats ---------------- */
.stats {
  padding: 36px 0;
  background: #FFFFFF;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.stats__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.stat { display: flex; flex-direction: column; gap: 4px; }
.stat__num {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  color: var(--brand);
  line-height: 1.15;
}
.stat__label { font-size: 13px; font-weight: 400; color: var(--text-2); }

/* ---------------- Section 通用 ---------------- */
.section { padding: 88px 0; background: #FFFFFF; }
.section--muted { background: var(--muted-bg); }

.sec-head { display: flex; flex-direction: column; gap: 14px; margin-bottom: 44px; }
.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--brand);
}
.sec-title {
  font-size: 34px;
  line-height: 44px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -.01em;
}
.sec-desc {
  font-size: 16px;
  line-height: 28px;
  font-weight: 400;
  color: var(--text-2);
  max-width: 900px;
}

/* ---------------- 栅格 ---------------- */
.grid { display: grid; gap: 20px; }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

/* ---------------- 能力卡 ---------------- */
.card {
  background: #FFFFFF;
  border: 1px solid var(--line);
  border-radius: var(--r-2xl);
  padding: 26px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: box-shadow .2s ease, transform .2s ease;
}
.card:hover { box-shadow: var(--shadow-card); transform: translateY(-2px); }
.cap-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--r-lg);
  background: var(--brand-tint);
}
.card__title { font-size: 17px; font-weight: 600; color: var(--ink); line-height: 1.4; }
.card__desc { font-size: 14px; line-height: 24px; font-weight: 400; color: var(--text-2); }

/* ---------------- 终端块 ---------------- */
.terminal {
  margin-top: 20px;
  background: #FFFFFF;
  border: 1px solid var(--line);
  border-radius: var(--r-3xl);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.terminal__title { font-size: 19px; font-weight: 600; color: var(--ink); line-height: 1.4; }
.terminal__desc { font-size: 14px; line-height: 24px; color: var(--text-2); }
.chips { display: flex; flex-wrap: wrap; gap: 10px; }
.chip {
  padding: 9px 16px;
  border-radius: 100px;
  background: var(--brand-tint);
  font-size: 13px;
  font-weight: 500;
  color: var(--brand);
}

/* ---------------- 案例卡 ---------------- */
.case {
  background: #FFFFFF;
  border: 1px solid var(--line);
  border-radius: var(--r-2xl);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: box-shadow .2s ease, transform .2s ease;
}
.case:hover { box-shadow: var(--shadow-card); transform: translateY(-2px); }
.case__visual {
  height: 200px;
  overflow: hidden;
  background: #F5F7F6;
}
.case__visual svg { width: 100%; height: 100%; }
.case__body {
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.case__title { font-size: 17px; font-weight: 600; color: var(--ink); line-height: 1.4; }
.case__desc { font-size: 14px; line-height: 24px; font-weight: 400; color: var(--text-2); }
.tags { display: flex; flex-wrap: wrap; gap: 8px; }
.tag {
  padding: 5px 10px;
  border-radius: var(--r-sm);
  background: var(--tag-bg);
  font-size: 11px;
  font-weight: 400;
  color: var(--text-2);
}

/* ---------------- 流程 ---------------- */
.step {
  background: #FFFFFF;
  border: 1px solid var(--line);
  border-radius: var(--r-2xl);
  padding: 26px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.step__num {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--brand);
  line-height: 1.2;
}
.step__title { font-size: 17px; font-weight: 600; color: var(--ink); line-height: 1.4; }
.step__desc { font-size: 14px; line-height: 24px; font-weight: 400; color: var(--text-2); }

/* ---------------- FAQ ---------------- */
.faq {
  background: #FFFFFF;
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.faq__q { font-size: 16px; font-weight: 600; color: var(--ink); line-height: 1.5; }
.faq__a { font-size: 14px; line-height: 24px; font-weight: 400; color: var(--text-2); }

/* ---------------- 联系区 ---------------- */
.contact__row { display: flex; gap: 48px; align-items: flex-start; }
.contact__info {
  width: 432px;
  flex: 0 0 432px;
  display: flex;
  flex-direction: column;
  gap: 28px;
}
.contact__title {
  font-size: 32px;
  line-height: 42px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -.01em;
}
.contact__desc { font-size: 15px; line-height: 27px; font-weight: 400; color: var(--text-2); }

.info-block { display: flex; flex-direction: column; gap: 6px; }
.info-block__label { font-size: 13px; font-weight: 400; color: var(--text-2); }
.info-block__value {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 500;
  color: var(--ink);
}
.info-block__value:hover { color: var(--brand); }

.qr-card {
  align-self: flex-start;
  padding: 10px;
  border-radius: var(--r-xl);
  background: #FFFFFF;
  border: 1px solid var(--line);
  margin-bottom: 4px;
}
.qr-card img {
  display: block;
  width: 132px;
  height: 132px;
  border-radius: 4px;
}
.qr-caption { font-size: 13px; font-weight: 400; color: var(--text-2); }
.contact__note { font-size: 14px; font-weight: 500; color: var(--brand); }

/* ---------------- 表单 ---------------- */
.lead-form {
  /* 用 flex-basis: 0 使宽度只由剩余空间决定，不随内容（提示文案长度）变化 */
  flex: 1 1 0;
  min-width: 0;
  background: #FFFFFF;
  border: 1px solid var(--line);
  border-radius: var(--r-3xl);
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 22px;
  box-shadow: var(--shadow-card);
}
.lead-form__title { font-size: 20px; font-weight: 600; color: var(--ink); line-height: 1.4; }

.field-row { display: flex; gap: 16px; }
.field { flex: 1 1 0; display: flex; flex-direction: column; gap: 8px; min-width: 0; }
.field__label { font-size: 13px; font-weight: 500; color: var(--ink); }

.field__input {
  height: 46px;
  padding: 0 14px;
  border: 1px solid var(--line-input);
  border-radius: var(--r-lg);
  background: #FFFFFF;
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--ink);
  transition: border-color .18s ease, box-shadow .18s ease;
}
.field__input::placeholder { color: var(--placeholder); }
.field__input:focus {
  outline: none;
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(30, 111, 92, .1);
}

.field__textarea {
  border: 1px solid var(--line-input);
  border-radius: var(--r-lg);
  background: #FFFFFF;
  padding: 14px;
  display: flex;
  flex-direction: column;
  transition: border-color .18s ease, box-shadow .18s ease;
}
.field__textarea:focus-within {
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(30, 111, 92, .1);
}
.field__textarea textarea {
  border: none;
  outline: none;
  resize: none;
  height: 112px;
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 22px;
  color: var(--ink);
  background: transparent;
  padding: 0;
}
.field__textarea textarea::placeholder { color: var(--placeholder); }
.counter {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--placeholder);
  text-align: right;
}
.counter.is-full { color: var(--brand); }

/* 预留一行高度：提示文案长短切换时卡片高度不跳动 */
.lead-form__note { font-size: 12px; font-weight: 400; color: var(--text-2); line-height: 1.6; min-height: 19px; }
.lead-form__note.is-ok { color: var(--brand); font-weight: 500; }
.lead-form__note.is-err { color: #C0392B; font-weight: 500; }

.field.is-invalid .field__input,
.field.is-invalid .field__textarea { border-color: #C0392B; }

/* ---------------- AI 润色 / AI 预案 ---------------- */
.field__tools {
  display: flex;
  align-items: center;
  justify-content: flex-end; /* 计数与 AI 润色一并靠右下角 */
  gap: 12px;
  margin-top: 10px;
}
.field__tools .counter { flex: none; }
.ai-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 28px;
  padding: 0 10px;
  border: 1px solid var(--line-input);
  border-radius: 999px;
  background: #FFFFFF;
  color: var(--text-2);
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: border-color .18s ease, color .18s ease, background .18s ease;
}
.ai-btn:hover { border-color: var(--brand); color: var(--brand); background: var(--brand-tint); }
.ai-btn:focus-visible { outline: 2px solid var(--brand); outline-offset: 2px; }
.ai-btn[disabled] { opacity: .6; cursor: progress; }
.ai-btn.is-loading svg { animation: ai-pulse 1.1s ease-in-out infinite; }
@keyframes ai-pulse {
  0%, 100% { opacity: .35; transform: scale(.92); }
  50%      { opacity: 1;   transform: scale(1); }
}
@media (prefers-reduced-motion: reduce) {
  .ai-btn.is-loading svg { animation: none; }
}

.btn--ai {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  height: 46px;
  border: 1px solid var(--line-input);
  border-radius: var(--r-lg);
  background: #FFFFFF;
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: border-color .18s ease, color .18s ease;
}
.btn--ai svg { color: var(--brand); flex: none; }
.btn--ai:hover { border-color: var(--brand); color: var(--brand); }
.btn--ai:focus-visible { outline: 2px solid var(--brand); outline-offset: 2px; }
.btn--ai[disabled] { opacity: .62; cursor: progress; }

.ai-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: #FFFFFF;
}
.ai-card[hidden] { display: none; }
.ai-card__head { display: flex; align-items: center; gap: 10px; }
.ai-card__badge {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .02em;
  color: var(--brand);
  background: var(--brand-tint);
  padding: 3px 8px;
  border-radius: 999px;
}
.ai-card__hint { font-size: 12px; color: var(--text-2); }
.ai-card__summary { font-size: 14px; font-weight: 500; line-height: 1.6; color: var(--ink); }
.ai-card__summary:empty { display: none; }
.ai-block { display: flex; flex-direction: column; gap: 6px; }
.ai-block__label,
.ai-metric__label { font-size: 12px; color: var(--text-2); }
.ai-block__value {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink);
  white-space: pre-line;
}
.ai-metrics { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.ai-metric {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--muted-bg);
}
.ai-metric__value {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.5;
  color: var(--ink);
}
.ai-card__disclaimer {
  font-size: 12px;
  line-height: 1.6;
  color: var(--text-2);
  border-top: 1px solid var(--line);
  padding-top: 12px;
}
.ai-card.is-loading .ai-block__value,
.ai-card.is-loading .ai-metric__value,
.ai-card.is-loading .ai-card__summary { color: var(--placeholder); }
.ai-card.is-error { border-color: #E3C4BE; }
.ai-card.is-error .ai-metrics,
.ai-card.is-error .ai-card__disclaimer,
.ai-card.is-error .ai-card__summary { display: none; }

/* ---------------- Footer ---------------- */
.footer {
  background: var(--ink);
  padding: 64px 0 32px;
}
.footer .container { display: flex; flex-direction: column; gap: 44px; }

.footer__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.footer__headline {
  font-size: 30px;
  line-height: 42px;
  font-weight: 700;
  color: #FFFFFF;
  letter-spacing: -.01em;
  max-width: 720px;
}
.footer__top .btn { padding: 15px 28px; }

.footer__cols { display: flex; gap: 64px; }
.footer__col { flex: 1 1 0; display: flex; flex-direction: column; gap: 14px; }
.footer__col-title { font-size: 13px; font-weight: 600; color: #FFFFFF; }
.footer__col p { font-size: 14px; font-weight: 400; color: var(--footer-text); }
.footer__link:hover { color: #FFFFFF; text-decoration: underline; }

.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 13px;
  font-weight: 400;
  color: var(--footer-dim);
}

.footer__icp {
  padding-top: 22px;
  border-top: 1px solid var(--footer-line);
  display: flex;
  justify-content: center;
}
.icp {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 400;
  color: var(--footer-text);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.icp:hover { color: #FFFFFF; }

/* =========================================================
   响应式：平板
   ========================================================= */
@media (max-width: 1279px) {
  .container { padding-left: 48px; padding-right: 48px; }
  .hero__text { width: 540px; flex-basis: 540px; min-width: 0; }
  /* 允许首屏示意图按比例收缩，避免 1024-1279 区间横向溢出 */
  .hero__visual { flex: 0 1 440px; min-width: 0; }
  .hero__visual svg { width: 100%; max-width: 440px; height: auto; }
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .contact__info { width: 380px; flex-basis: 380px; }
}

@media (max-width: 1023px) {
  .container { padding-left: 40px; padding-right: 40px; }
  .hero__inner { flex-direction: column; align-items: flex-start; gap: 40px; }
  .hero__text { width: 100%; flex-basis: auto; }
  .hero__visual { flex: 0 0 auto; align-self: center; }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
  .grid--2 { grid-template-columns: 1fr; }
  /* 纵向排列时 align-items 作用于横向轴，必须改为 stretch，
     否则卡片会收缩贴合内容、宽度随提示文案长度跳动 */
  .contact__row { flex-direction: column; align-items: stretch; gap: 32px; }
  .contact__info { width: 100%; flex-basis: auto; }
  .lead-form { flex: 0 0 auto; width: 100%; }
  .footer__cols { flex-wrap: wrap; gap: 40px; }
  .footer__col { flex: 1 1 200px; }
}

/* =========================================================
   响应式：移动端（还原 390 设计稿）
   ========================================================= */
@media (max-width: 767px) {
  .container { padding-left: 24px; padding-right: 24px; }

  /* Header 64 / padding 0 24 */
  .header, .header__inner { height: 64px; }
  .logo__tag { display: none; }
  .logo__mark svg { width: 30px; height: 30px; }
  .logo__word { font-size: 16px; }
  .nav { display: none; }
  .btn--sm { padding: 9px 16px; font-size: 13px; }

  /* Hero：padding 52 24 44 / gap 22 */
  .hero { padding: 52px 0 44px; }
  .hero__inner { gap: 0; }
  .hero__text { gap: 22px; }
  .hero__visual { display: none; }
  .badge { padding: 6px 13px; gap: 7px; font-size: 12px; }
  .hero__title { font-size: 30px; line-height: 42px; }
  .hero__sub { font-size: 15px; line-height: 26px; }
  .hero__cta { flex-direction: column; align-items: stretch; gap: 10px; width: 100%; }
  .hero__cta .btn--primary { height: 50px; padding: 0 16px; }
  .hero__cta .btn--ghost { height: 48px; padding: 0 16px; }
  .hero__trust { gap: 16px 16px; row-gap: 8px; }

  /* Stats：padding 22 24 / wrap gap 28 16 */
  .stats { padding: 22px 0; }
  .stats__inner { flex-wrap: wrap; gap: 16px 28px; justify-content: flex-start; }
  .stat { min-width: 120px; }

  /* Section：padding 56 24 / gap 28 */
  .section { padding: 56px 0; }
  .sec-head { gap: 12px; margin-bottom: 28px; }
  .eyebrow { font-size: 11px; }
  .sec-title { font-size: 24px; line-height: 32px; }
  .sec-desc { font-size: 15px; line-height: 26px; }

  /* 单列 */
  .grid { gap: 12px; }
  .grid--3, .grid--4, .grid--2 { grid-template-columns: 1fr; }
  .card { padding: 22px; }
  .case__visual { height: auto; aspect-ratio: 413 / 200; }
  .case__body { padding: 22px; }
  .step { padding: 22px; }
  .terminal { padding: 22px; margin-top: 12px; }

  /* 联系区 */
  .contact__row { gap: 28px; }
  .contact__info { gap: 24px; }
  .contact__title { font-size: 26px; line-height: 36px; }
  .lead-form { padding: 22px; gap: 18px; }
  .lead-form__note { min-height: 38.4px; } /* 移动端文案最长 2 行，预留两行高度避免跳动 */
  .field-row { flex-direction: column; gap: 18px; }

  /* Footer */
  .footer { padding: 48px 0 24px; }
  .footer .container { gap: 32px; }
  .footer__top { flex-direction: column; align-items: flex-start; gap: 20px; }
  .footer__headline { font-size: 24px; line-height: 34px; }
  .footer__top .btn { width: 100%; }
  .footer__cols { flex-direction: column; gap: 24px; }
  .footer__bottom { flex-direction: column; align-items: flex-start; gap: 6px; }
  .footer__icp { padding-top: 18px; }
  .icp { font-size: 12px; gap: 6px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}