/* 小米风格企业官网 - 全局样式 */
:root {
  --mi-orange: #ff6900;
  --mi-orange-dark: #e65c00;
  --mi-orange-light: #fff3ea;
  --text: #333333;
  --text-sub: #757575;
  --text-light: #9e9e9e;
  --bg: #f5f5f5;
  --bg-soft: #fafafa;
  --border: #e6e6e6;
  --radius: 12px;
  --shadow: 0 4px 16px rgba(0, 0, 0, .06);
  --shadow-hover: 0 12px 28px rgba(0, 0, 0, .12);
  --header-h: 72px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  color: var(--text);
  background: #fff;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
ul { list-style: none; }

.container { width: 1226px; max-width: 100%; margin: 0 auto; padding: 0 16px; }

/* ============ 顶部导航 ============ */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, .96);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 40px;
}
.logo { display: flex; align-items: center; gap: 10px; flex: none; }
.logo img { width: 36px; height: 36px; }
.logo span { font-size: 20px; font-weight: 700; letter-spacing: 1px; }

.nav { display: flex; gap: 36px; flex: 1; }
.nav a {
  font-size: 15px;
  color: var(--text);
  padding: 6px 0;
  position: relative;
  transition: color .2s;
}
.nav a:hover { color: var(--mi-orange); }
.nav a.active { color: var(--mi-orange); font-weight: 600; }
.nav a.active::after {
  content: "";
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  bottom: -2px;
  width: 24px;
  height: 3px;
  border-radius: 2px;
  background: var(--mi-orange);
}

.header-actions { display: flex; align-items: center; gap: 12px; flex: none; }

/* 移动端汉堡按钮 */
.nav-toggle {
  display: none;
  order: 3;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 8px;
  cursor: pointer;
  flex: none;
}
.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text);
  margin: 3.5px auto;
  border-radius: 2px;
  transition: transform .25s, opacity .2s;
}
.nav-toggle.active span:nth-child(1) { transform: translateY(5.5px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-5.5px) rotate(-45deg); }

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 44px;
  padding: 0 26px;
  border-radius: 22px;
  font-size: 15px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all .2s;
  font-family: inherit;
}
.btn-primary { background: var(--mi-orange); color: #fff; }
.btn-primary:hover { background: var(--mi-orange-dark); transform: translateY(-1px); box-shadow: 0 6px 16px rgba(255, 105, 0, .3); }
.btn-outline { border-color: var(--border); color: var(--text); background: #fff; }
.btn-outline:hover { border-color: var(--mi-orange); color: var(--mi-orange); }
.btn-sm { height: 36px; padding: 0 18px; font-size: 14px; border-radius: 18px; }
.btn-block { width: 100%; }

/* ============ Hero ============ */
.hero {
  background: linear-gradient(135deg, #fff7f1 0%, #f7f8fa 55%, #eef1f5 100%);
  padding: 72px 0 80px;
  overflow: hidden;
}
.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}
.hero-tag {
  display: inline-block;
  background: var(--mi-orange-light);
  color: var(--mi-orange);
  font-size: 13px;
  padding: 6px 14px;
  border-radius: 14px;
  margin-bottom: 22px;
}
.hero h1 { font-size: 48px; line-height: 1.25; font-weight: 800; letter-spacing: 1px; }
.hero h1 em { font-style: normal; color: var(--mi-orange); }
.hero p { margin-top: 20px; font-size: 17px; color: var(--text-sub); max-width: 460px; }
.hero-actions { margin-top: 34px; display: flex; gap: 14px; flex-wrap: wrap; }
.hero-img { display: flex; justify-content: center; }
.hero-img img { width: 100%; max-width: 460px; }

/* ============ 通用区块 ============ */
.section { padding: 72px 0; }
.section-soft { background: var(--bg); }
.section-head { text-align: center; margin-bottom: 44px; }
.section-head h2 { font-size: 32px; font-weight: 700; }
.section-head p { margin-top: 10px; color: var(--text-sub); font-size: 15px; }

/* 卡片 */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.card {
  background: #fff;
  border-radius: var(--radius);
  padding: 34px 30px;
  box-shadow: var(--shadow);
  transition: all .25s ease;
  border: 1px solid transparent;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); border-color: #ffe0cc; }
.card .icon {
  width: 96px;
  height: 96px;
  margin-bottom: 20px;
}
.card h3 { font-size: 20px; margin-bottom: 10px; }
.card p { color: var(--text-sub); font-size: 14px; min-height: 48px; }
.card .more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 18px;
  color: var(--mi-orange);
  font-size: 14px;
  font-weight: 600;
}
.card .more::after { content: "→"; transition: transform .2s; }
.card:hover .more::after { transform: translateX(4px); }

/* 数据条 */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.stats .item { padding: 34px 20px; text-align: center; border-right: 1px solid var(--border); }
.stats .item:last-child { border-right: none; }
.stats .num { font-size: 32px; font-weight: 800; color: var(--mi-orange); }
.stats .label { font-size: 14px; color: var(--text-sub); margin-top: 4px; }

/* ============ 内页 ============ */
.page-banner {
  background: linear-gradient(135deg, #2b2b2b 0%, #1f1f1f 100%);
  color: #fff;
  padding: 56px 0;
}
.page-banner h1 { font-size: 36px; font-weight: 700; }
.page-banner p { margin-top: 10px; color: rgba(255, 255, 255, .7); font-size: 15px; }

.panel {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 36px;
}
.panel + .panel { margin-top: 24px; }
.panel h2 { font-size: 22px; margin-bottom: 8px; }
.panel .desc { color: var(--text-sub); font-size: 14px; margin-bottom: 24px; }

/* 占位区块 */
.placeholder {
  border: 1px dashed #d5d5d5;
  border-radius: 10px;
  background: repeating-linear-gradient(45deg, #fcfcfc, #fcfcfc 10px, #f7f7f7 10px, #f7f7f7 20px);
  color: var(--text-light);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  text-align: center;
  padding: 40px 20px;
  font-size: 14px;
}
.placeholder .ph-title { font-size: 16px; color: var(--text-sub); font-weight: 600; }
.placeholder.tall { min-height: 260px; }
.placeholder.short { min-height: 120px; }

/* 目录 / 章节骨架 */
.chapter-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.chapter {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px;
  transition: all .2s;
}
.chapter:hover { border-color: var(--mi-orange); }
.chapter h4 { font-size: 16px; margin-bottom: 6px; }
.chapter p { font-size: 13px; color: var(--text-light); }

/* 表单 */
.form-row { display: flex; gap: 12px; flex-wrap: wrap; }
.input {
  flex: 1;
  min-width: 240px;
  height: 48px;
  padding: 0 18px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 15px;
  font-family: inherit;
  outline: none;
  transition: border-color .2s;
}
.input:focus { border-color: var(--mi-orange); }
.form-tip { margin-top: 12px; font-size: 13px; color: var(--text-light); }

.result-box {
  margin-top: 24px;
  border-top: 1px solid var(--border);
  padding-top: 24px;
}
.result-empty { text-align: center; padding: 40px 0; color: var(--text-light); }
.result-empty .big { font-size: 40px; margin-bottom: 10px; opacity: .35; }

table.result-table { width: 100%; border-collapse: collapse; font-size: 14px; }
table.result-table th,
table.result-table td { padding: 12px 14px; border-bottom: 1px solid var(--border); text-align: left; }
table.result-table th { background: var(--bg-soft); color: var(--text-sub); font-weight: 600; }
.pass { color: #52c41a; font-weight: 600; }

/* 客服 */
.chat-layout { display: grid; grid-template-columns: 280px 1fr; gap: 24px; align-items: start; }
.chat-window {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}
.chat-body { height: 380px; overflow-y: auto; padding: 20px; background: #fff; }
.bubble { max-width: 78%; padding: 12px 16px; border-radius: 14px; font-size: 14px; margin-bottom: 14px; line-height: 1.6; }
.bubble.bot { background: var(--bg-soft); border-top-left-radius: 4px; }
.bubble.me { background: var(--mi-orange); color: #fff; margin-left: auto; border-top-right-radius: 4px; }
.chat-foot { display: flex; gap: 10px; padding: 14px; border-top: 1px solid var(--border); background: #fff; }

.quick-list { display: flex; flex-direction: column; gap: 10px; }
.quick-item {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 14px;
  font-size: 14px;
  cursor: pointer;
  transition: all .2s;
}
.quick-item:hover { border-color: var(--mi-orange); color: var(--mi-orange); }

/* ============ 页脚 ============ */
.footer { background: #fff; border-top: 1px solid var(--border); padding: 48px 0 28px; margin-top: 40px; }
.footer-cols { display: grid; grid-template-columns: 1.4fr repeat(3, 1fr); gap: 32px; }
.footer h5 { font-size: 15px; margin-bottom: 14px; }
.footer li { font-size: 13px; color: var(--text-sub); padding: 5px 0; }
.footer li:hover { color: var(--mi-orange); }
.footer .brand p { font-size: 13px; color: var(--text-sub); margin-top: 12px; }
.footer-bottom {
  margin-top: 32px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 12px;
  color: var(--text-light);
}
.footer-bottom a { color: var(--text-light); transition: color .2s; }
.footer-bottom a:hover { color: var(--mi-orange); }

/* 表格横向滚动容器 */
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.table-wrap table { min-width: 520px; }

/* ============ 响应式 ============ */
@media (max-width: 1080px) {
  .container { width: 100%; }
  .hero-inner { grid-template-columns: 1fr; text-align: center; }
  .hero p { margin-left: auto; margin-right: auto; }
  .hero-actions { justify-content: center; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stats .item:nth-child(2) { border-right: none; }
  .stats .item:nth-child(3) { border-top: 1px solid var(--border); }
  .stats .item:nth-child(4) { border-top: 1px solid var(--border); }
  .chat-layout { grid-template-columns: 1fr; }
  .footer-cols { grid-template-columns: repeat(2, 1fr); }
}

/* 平板 / 手机：切换为汉堡菜单 */
@media (max-width: 900px) {
  .header-inner { gap: 12px; justify-content: space-between; }
  .logo { flex: 1; }
  .logo span { font-size: 18px; }
  .nav-toggle { display: block; }
  .nav {
    display: none;
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    padding: 4px 16px 12px;
    background: #fff;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
  }
  .nav.open { display: flex; }
  .nav a {
    padding: 14px 2px;
    font-size: 16px;
    border-bottom: 1px solid #f2f2f2;
  }
  .nav a:last-child { border-bottom: none; }
  .nav a.active::after { display: none; }
}

@media (max-width: 720px) {
  .container { padding: 0 14px; }
  .hero { padding: 40px 0 48px; }
  .hero h1 { font-size: 30px; }
  .hero p { font-size: 15px; }
  .hero-tag { font-size: 12px; padding: 5px 12px; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .btn { width: 100%; }
  .hero-img img { max-width: 320px; }

  .section { padding: 40px 0; }
  .section-head { margin-bottom: 28px; }
  .section-head h2 { font-size: 24px; }

  .grid-3 { grid-template-columns: 1fr; gap: 16px; }
  .chapter-list { grid-template-columns: 1fr; gap: 14px; }
  .card { padding: 24px 20px; }
  .card .icon { width: 72px; height: 72px; }
  .card p { min-height: 0; }

  .page-banner { padding: 32px 0; }
  .page-banner h1 { font-size: 26px; }
  .page-banner p { font-size: 14px; }

  .panel { padding: 20px; }
  .panel h2 { font-size: 19px; }

  .form-row { flex-direction: column; }
  .form-row .input { min-width: 0; width: 100%; }
  .form-row .btn { width: 100%; }

  .chat-body { height: 320px; padding: 16px; }
  .bubble { max-width: 88%; font-size: 14px; }

  .stats .item { padding: 22px 10px; }
  .stats .num { font-size: 26px; }
  .placeholder.tall { min-height: 200px; padding: 28px 16px; }

  .footer { padding: 36px 0 20px; }
  .footer-cols { grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .footer-bottom { font-size: 11px; line-height: 1.8; }
}

@media (max-width: 400px) {
  .footer-cols { grid-template-columns: 1fr; }
  .header-actions .btn { padding: 0 14px; font-size: 13px; }
}