/* ============================================================
   索贝文博 · 全站统一样式
   杭州索贝环境设备有限公司 官方网站
   设计基调：专业 · 文化 · 可信赖（深蓝 + 米白 + 古铜）
   ============================================================ */

/* ---------- 设计变量 ---------- */
:root {
  /* 主色系 */
  --navy-900: #0f2a45;
  --navy-800: #16324f;
  --navy-700: #1d4d75;
  --navy-600: #2a6a9e;
  --navy-100: #e8eef5;

  /* 暖色点缀 */
  --bronze: #b98a4f;
  --bronze-dark: #9a7040;
  --bronze-light: #d8b988;

  /* 中性色 */
  --ink: #26303a;
  --muted: #6b7683;
  --line: #e4e0d8;
  --warm: #f7f4ee;
  --warm-deep: #efe9de;
  --white: #ffffff;

  /* 字体 */
  --font-serif: "Noto Serif SC", "Songti SC", "STSong", Georgia, "Times New Roman", serif;
  --font-sans: -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;

  /* 尺寸 */
  --container: 1160px;
  --radius: 12px;
  --radius-lg: 20px;
  --shadow: 0 12px 32px rgba(15, 42, 69, 0.10);
  --shadow-lg: 0 24px 56px rgba(15, 42, 69, 0.16);

  /* 过渡 */
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 基础重置 ---------- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  color: var(--ink);
  background: var(--white);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

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

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

ul {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

section {
  position: relative;
}

/* ---------- 通用标题 ---------- */
.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 56px;
}

.section-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  letter-spacing: 3px;
  color: var(--bronze);
  font-weight: 600;
  margin-bottom: 14px;
}

.section-eyebrow::before,
.section-eyebrow::after {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--bronze);
  opacity: 0.6;
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(28px, 3.4vw, 40px);
  font-weight: 700;
  color: var(--navy-900);
  line-height: 1.3;
  margin-bottom: 16px;
}

.section-sub {
  color: var(--muted);
  font-size: 16px;
}

/* 页面内页标题横幅 */
.page-hero {
  background: linear-gradient(135deg, var(--navy-900) 0%, var(--navy-700) 100%);
  color: var(--white);
  padding: 96px 0 84px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 18% 120%, rgba(185, 138, 79, 0.28), transparent 42%),
    radial-gradient(circle at 85% -10%, rgba(42, 106, 158, 0.5), transparent 50%);
  pointer-events: none;
}

.page-hero .container {
  position: relative;
  z-index: 1;
}

.page-hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(30px, 4vw, 46px);
  margin-bottom: 16px;
  font-weight: 700;
}

.page-hero p {
  color: rgba(255, 255, 255, 0.82);
  font-size: 17px;
  max-width: 620px;
  margin: 0 auto;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 30px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.5px;
  transition: all 0.25s var(--ease);
  white-space: nowrap;
}

.btn-primary {
  background: var(--bronze);
  color: var(--white);
  box-shadow: 0 8px 24px rgba(185, 138, 79, 0.35);
}

.btn-primary:hover {
  background: var(--bronze-dark);
  transform: translateY(-2px);
  box-shadow: 0 12px 30px rgba(185, 138, 79, 0.4);
}

.btn-outline {
  border: 1.5px solid rgba(255, 255, 255, 0.55);
  color: var(--white);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--white);
}

.btn-ghost {
  border: 1.5px solid var(--navy-700);
  color: var(--navy-700);
}

.btn-ghost:hover {
  background: var(--navy-700);
  color: var(--white);
}

.btn-lg {
  padding: 16px 38px;
  font-size: 16px;
}

/* ============================================================
   顶部导航
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15, 42, 69, 0.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--bronze), var(--bronze-dark));
  color: var(--white);
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 16px rgba(185, 138, 79, 0.35);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand-text strong {
  color: var(--white);
  font-size: 19px;
  letter-spacing: 1px;
  font-weight: 700;
}

.brand-text small {
  color: rgba(255, 255, 255, 0.6);
  font-size: 11px;
  letter-spacing: 0.5px;
  margin-top: 2px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-link {
  color: rgba(255, 255, 255, 0.85);
  padding: 8px 16px;
  border-radius: 999px;
  font-size: 15px;
  transition: all 0.2s;
}

.nav-link:hover {
  color: var(--white);
  background: rgba(255, 255, 255, 0.08);
}

.nav-link.active {
  color: var(--white);
  background: rgba(185, 138, 79, 0.22);
  box-shadow: inset 0 0 0 1px rgba(185, 138, 79, 0.45);
}

.nav-cta {
  color: var(--white);
  background: var(--bronze);
  font-weight: 600;
}

.nav-cta:hover {
  background: var(--bronze-dark);
  color: var(--white);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--white);
  border-radius: 2px;
  transition: all 0.3s var(--ease);
}

.nav-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ============================================================
   首页 · 首屏 Hero
   ============================================================ */
.hero {
  background: linear-gradient(150deg, var(--navy-900) 0%, var(--navy-800) 55%, var(--navy-700) 100%);
  color: var(--white);
  padding: 120px 0 140px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(255, 255, 255, 0.06) 1px, transparent 1px);
  background-size: 26px 26px;
  mask-image: radial-gradient(circle at 70% 40%, black, transparent 70%);
  pointer-events: none;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  align-items: center;
  gap: 64px;
  position: relative;
  z-index: 1;
}

.hero-copy .hero-tagline {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  letter-spacing: 3px;
  color: var(--bronze-light);
  margin-bottom: 22px;
}

.hero-copy .hero-tagline::before {
  content: "";
  width: 34px;
  height: 1px;
  background: var(--bronze);
}

.hero-copy h1 {
  font-family: var(--font-serif);
  font-size: clamp(34px, 5vw, 54px);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 22px;
}

.hero-copy h1 em {
  font-style: normal;
  color: var(--bronze-light);
}

.hero-copy .hero-desc {
  color: rgba(255, 255, 255, 0.82);
  font-size: 17px;
  max-width: 500px;
  margin-bottom: 36px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* Hero 右侧图形 —— 拱形博物馆意象 */
.hero-art {
  position: relative;
  display: flex;
  justify-content: center;
}

.hero-art svg {
  width: min(400px, 90%);
  height: auto;
}

/* 首页统计条 */
.hero-stats {
  position: absolute;
  bottom: -46px;
  left: 0;
  right: 0;
  z-index: 2;
}

.stats-bar {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  padding: 34px 20px;
  text-align: center;
}

.stat-item + .stat-item {
  border-left: 1px solid var(--line);
}

.stat-num {
  font-family: var(--font-serif);
  font-size: clamp(28px, 3.4vw, 40px);
  font-weight: 700;
  color: var(--navy-800);
  line-height: 1.2;
}

.stat-num span {
  font-size: 0.6em;
  color: var(--bronze);
  margin-left: 2px;
}

.stat-label {
  color: var(--muted);
  font-size: 14px;
  margin-top: 4px;
}

/* ============================================================
   通用区块
   ============================================================ */
.section-pad {
  padding: 96px 0;
}

.section-warm {
  background: var(--warm);
}

/* 首页特色：为什么选择我们 */
.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 34px 26px;
  box-shadow: 0 6px 24px rgba(15, 42, 69, 0.06);
  border: 1px solid rgba(228, 224, 216, 0.7);
  transition: all 0.3s var(--ease);
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
}

.feature-icon {
  width: 54px;
  height: 54px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--navy-100), #ffffff);
  border: 1px solid rgba(29, 77, 117, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--navy-700);
}

.feature-icon svg {
  width: 28px;
  height: 28px;
}

.feature-card h3 {
  font-size: 18px;
  color: var(--navy-900);
  margin-bottom: 10px;
  font-weight: 700;
}

.feature-card p {
  font-size: 14.5px;
  color: var(--muted);
  line-height: 1.75;
}

/* 首页双栏介绍 */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 72px;
  align-items: center;
}

.split-visual {
  position: relative;
}

.split-visual .visual-frame {
  background: linear-gradient(145deg, var(--navy-100), var(--warm-deep));
  border-radius: var(--radius-lg);
  padding: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 380px;
  border: 1px solid var(--line);
  position: relative;
  overflow: hidden;
}

.split-visual .visual-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(29, 77, 117, 0.08) 1px, transparent 1px);
  background-size: 20px 20px;
}

.split-visual .visual-frame svg {
  position: relative;
  width: min(320px, 90%);
  height: auto;
}

.split-copy h2 {
  font-family: var(--font-serif);
  font-size: clamp(26px, 3.2vw, 36px);
  color: var(--navy-900);
  margin-bottom: 20px;
  line-height: 1.4;
}

.split-copy p {
  color: var(--muted);
  margin-bottom: 16px;
}

.split-copy ul.ticks {
  margin: 24px 0;
}

.split-copy ul.ticks li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 7px 0;
  color: var(--ink);
  font-size: 15px;
}

.split-copy ul.ticks svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  margin-top: 4px;
  color: var(--bronze);
}

/* 服务领域 */
.domains-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.domain-card {
  text-align: center;
  padding: 44px 24px;
  background: var(--white);
  border-radius: var(--radius);
  border: 1px solid var(--line);
  transition: all 0.3s var(--ease);
}

.domain-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
  border-color: var(--bronze-light);
}

.domain-icon {
  width: 74px;
  height: 74px;
  margin: 0 auto 20px;
  border-radius: 50%;
  background: linear-gradient(145deg, var(--navy-800), var(--navy-600));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  box-shadow: 0 10px 24px rgba(29, 77, 117, 0.28);
}

.domain-icon svg {
  width: 34px;
  height: 34px;
}

.domain-card h3 {
  font-size: 18px;
  color: var(--navy-900);
  margin-bottom: 10px;
}

.domain-card p {
  font-size: 14px;
  color: var(--muted);
}

/* ============================================================
   产品卡片
   ============================================================ */
.products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.product-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  transition: all 0.3s var(--ease);
  display: flex;
  flex-direction: column;
}

.product-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.product-thumb {
  background: linear-gradient(145deg, var(--navy-100), var(--warm-deep));
  padding: 40px 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
}

.product-thumb svg {
  width: 120px;
  height: auto;
}

.product-body {
  padding: 28px 26px 32px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.product-body h3 {
  font-size: 19px;
  color: var(--navy-900);
  margin-bottom: 10px;
}

.product-body p {
  font-size: 14.5px;
  color: var(--muted);
  flex: 1;
  margin-bottom: 18px;
}

.product-body .tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.tag {
  font-size: 12px;
  color: var(--navy-700);
  background: var(--navy-100);
  padding: 4px 12px;
  border-radius: 999px;
  font-weight: 500;
}

.text-link {
  color: var(--bronze-dark);
  font-size: 14.5px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.text-link:hover {
  gap: 10px;
  transition: gap 0.25s var(--ease);
}

/* ============================================================
   CTA 横幅
   ============================================================ */
.cta-band {
  background: linear-gradient(135deg, var(--navy-900) 0%, var(--navy-700) 100%);
  padding: 80px 0;
  color: var(--white);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-band::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 80% -30%, rgba(185, 138, 79, 0.35), transparent 50%);
}

.cta-band .container {
  position: relative;
  z-index: 1;
}

.cta-band h2 {
  font-family: var(--font-serif);
  font-size: clamp(26px, 3.4vw, 38px);
  margin-bottom: 16px;
}

.cta-band p {
  color: rgba(255, 255, 255, 0.8);
  max-width: 560px;
  margin: 0 auto 34px;
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  background: var(--navy-900);
  color: rgba(255, 255, 255, 0.75);
  padding: 72px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.2fr;
  gap: 56px;
  padding-bottom: 48px;
}

.footer-brand strong {
  font-family: var(--font-serif);
  font-size: 24px;
  color: var(--white);
  display: block;
  margin-bottom: 14px;
}

.footer-brand p {
  font-size: 14.5px;
  color: rgba(255, 255, 255, 0.6);
  max-width: 320px;
}

.footer-col h4 {
  color: var(--white);
  font-size: 16px;
  margin-bottom: 20px;
  font-weight: 600;
  letter-spacing: 1px;
}

.footer-col ul li {
  padding: 6px 0;
}

.footer-col ul a {
  font-size: 14.5px;
  color: rgba(255, 255, 255, 0.6);
  transition: color 0.2s;
}

.footer-col ul a:hover {
  color: var(--bronze-light);
}

.footer-contact li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  font-size: 14.5px;
  color: rgba(255, 255, 255, 0.7);
  padding: 6px 0;
}

.footer-contact svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  margin-top: 4px;
  color: var(--bronze-light);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 20px 0;
  text-align: center;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.45);
}

/* ============================================================
   关于我们页
   ============================================================ */
.about-intro .split-copy p {
  color: var(--muted);
}

.mission-card {
  background: var(--warm);
  border-left: 4px solid var(--bronze);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 28px 32px;
  margin: 28px 0;
}

.mission-card h3 {
  font-family: var(--font-serif);
  color: var(--navy-900);
  font-size: 20px;
  margin-bottom: 10px;
}

.mission-card p {
  color: var(--muted);
  font-size: 15px;
  margin-bottom: 0;
}

/* 价值观 */
.values-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.value-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 36px 30px;
  box-shadow: 0 6px 24px rgba(15, 42, 69, 0.06);
  border: 1px solid var(--line);
  transition: all 0.3s var(--ease);
}

.value-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
}

.value-card .value-num {
  font-family: var(--font-serif);
  font-size: 40px;
  color: var(--bronze);
  font-weight: 700;
  line-height: 1;
  margin-bottom: 18px;
  opacity: 0.9;
}

.value-card h3 {
  font-size: 18px;
  color: var(--navy-900);
  margin-bottom: 10px;
}

.value-card p {
  font-size: 14.5px;
  color: var(--muted);
}

/* 发展历程时间线 */
.timeline {
  position: relative;
  max-width: 820px;
  margin: 0 auto;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(var(--bronze-light), var(--navy-100));
  transform: translateX(-50%);
}

.timeline-item {
  display: flex;
  justify-content: flex-end;
  width: 50%;
  padding-right: 48px;
  position: relative;
  padding-bottom: 48px;
}

.timeline-item:nth-child(even) {
  justify-content: flex-start;
  align-self: flex-start;
  margin-left: 50%;
  padding-right: 0;
  padding-left: 48px;
}

.timeline-item::after {
  content: "";
  position: absolute;
  right: -8px;
  top: 8px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--bronze);
  border: 3px solid var(--white);
  box-shadow: 0 0 0 3px rgba(185, 138, 79, 0.3);
}

.timeline-item:nth-child(even)::after {
  right: auto;
  left: -8px;
}

.timeline-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 24px 28px;
  border: 1px solid var(--line);
  box-shadow: 0 6px 20px rgba(15, 42, 69, 0.05);
  text-align: left;
  width: 100%;
}

.timeline-card .tl-year {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 700;
  color: var(--bronze);
  margin-bottom: 6px;
}

.timeline-card h3 {
  font-size: 16px;
  color: var(--navy-900);
  margin-bottom: 8px;
}

.timeline-card p {
  font-size: 14px;
  color: var(--muted);
  margin: 0;
}

/* ============================================================
   产品与解决方案页
   ============================================================ */
.spec-table-wrap {
  background: var(--white);
  border-radius: var(--radius);
  border: 1px solid var(--line);
  overflow-x: auto;
  box-shadow: 0 6px 24px rgba(15, 42, 69, 0.05);
}

.spec-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 640px;
}

.spec-table th,
.spec-table td {
  padding: 18px 24px;
  text-align: left;
  font-size: 14.5px;
  border-bottom: 1px solid var(--line);
}

.spec-table thead th {
  background: var(--navy-800);
  color: var(--white);
  font-weight: 600;
  letter-spacing: 1px;
  font-size: 14px;
}

.spec-table tbody tr:hover {
  background: var(--warm);
}

.spec-table tbody tr:last-child td {
  border-bottom: none;
}

.spec-table td:first-child {
  font-weight: 600;
  color: var(--navy-900);
  white-space: nowrap;
}

.spec-note {
  text-align: center;
  color: var(--muted);
  font-size: 13.5px;
  margin-top: 18px;
}

/* 解决方案步骤 */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.step-card {
  position: relative;
  background: var(--white);
  border-radius: var(--radius);
  padding: 36px 26px 30px;
  border: 1px solid var(--line);
  text-align: center;
  transition: all 0.3s var(--ease);
}

.step-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
}

.step-num {
  position: absolute;
  top: -16px;
  left: 50%;
  transform: translateX(-50%);
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--bronze), var(--bronze-dark));
  color: var(--white);
  font-weight: 700;
  font-size: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 14px rgba(185, 138, 79, 0.35);
}

.step-card h3 {
  font-size: 17px;
  color: var(--navy-900);
  margin: 6px 0 10px;
}

.step-card p {
  font-size: 14px;
  color: var(--muted);
}

/* ============================================================
   客户案例页
   ============================================================ */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.case-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  overflow: hidden;
  transition: all 0.3s var(--ease);
}

.case-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.case-cover {
  background: linear-gradient(145deg, var(--navy-800), var(--navy-600));
  height: 168px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.25);
  font-family: var(--font-serif);
  font-size: 20px;
  letter-spacing: 4px;
  position: relative;
}

.case-cover::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(255, 255, 255, 0.1) 1px, transparent 1px);
  background-size: 22px 22px;
}

.case-body {
  padding: 26px;
}

.case-body .case-type {
  display: inline-block;
  font-size: 12px;
  color: var(--bronze-dark);
  background: rgba(185, 138, 79, 0.12);
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 12px;
  font-weight: 600;
}

.case-body h3 {
  font-size: 18px;
  color: var(--navy-900);
  margin-bottom: 10px;
}

.case-body p {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 14px;
}

.case-body .case-meta {
  font-size: 13px;
  color: var(--muted);
  border-top: 1px dashed var(--line);
  padding-top: 14px;
  display: flex;
  gap: 18px;
}

.case-empty {
  grid-column: 1 / -1;
  text-align: center;
  background: var(--white);
  border: 2px dashed var(--line);
  border-radius: var(--radius-lg);
  padding: 72px 32px;
  color: var(--muted);
}

.case-empty svg {
  width: 56px;
  height: 56px;
  margin: 0 auto 20px;
  color: var(--bronze-light);
}

.case-empty h3 {
  font-size: 20px;
  color: var(--navy-900);
  margin-bottom: 10px;
}

/* ============================================================
   联系我们页
   ============================================================ */
.contact-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 40px;
  align-items: start;
}

.contact-info {
  background: var(--navy-800);
  color: var(--white);
  border-radius: var(--radius-lg);
  padding: 40px 36px;
  position: relative;
  overflow: hidden;
}

.contact-info::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 90% 110%, rgba(185, 138, 79, 0.3), transparent 50%);
}

.contact-info .container-inner {
  position: relative;
  z-index: 1;
}

.contact-info h2 {
  font-family: var(--font-serif);
  font-size: 28px;
  margin-bottom: 10px;
}

.contact-info > .container-inner > p {
  color: rgba(255, 255, 255, 0.7);
  font-size: 15px;
  margin-bottom: 30px;
}

.contact-line {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 18px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.contact-line:last-of-type {
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.contact-line svg {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  margin-top: 4px;
  color: var(--bronze-light);
}

.contact-line .c-label {
  font-size: 12.5px;
  color: rgba(255, 255, 255, 0.55);
  letter-spacing: 2px;
  margin-bottom: 3px;
}

.contact-line .c-value {
  font-size: 16px;
  color: var(--white);
  font-weight: 500;
}

.contact-line .c-value.tel {
  font-size: 22px;
  font-weight: 700;
  color: var(--bronze-light);
  letter-spacing: 1px;
}

.contact-line .c-value.placeholder {
  color: rgba(255, 255, 255, 0.65);
  font-weight: 400;
  font-size: 14.5px;
}

/* 留言表单 */
.contact-form {
  background: var(--white);
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  padding: 40px 36px;
}

.contact-form h3 {
  font-size: 22px;
  color: var(--navy-900);
  margin-bottom: 8px;
}

.contact-form .form-tip {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 28px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--navy-900);
  margin-bottom: 8px;
}

.form-group label .req {
  color: #c0392b;
  margin-left: 2px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 13px 16px;
  border: 1.5px solid var(--line);
  border-radius: 10px;
  font-family: inherit;
  font-size: 15px;
  color: var(--ink);
  background: var(--warm);
  transition: all 0.2s;
  resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--navy-600);
  background: var(--white);
  box-shadow: 0 0 0 4px rgba(42, 106, 158, 0.12);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: #a9b1b8;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-submit-row {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

.form-status {
  font-size: 14px;
  color: var(--bronze-dark);
}

.form-status.error {
  color: #c0392b;
}

/* 联系页底部信息条 */
.contact-extra {
  margin-top: 72px;
  text-align: center;
}

.contact-extra p {
  color: var(--muted);
  max-width: 640px;
  margin: 0 auto;
  font-size: 15px;
}

/* ============================================================
   动画（进入视口淡入）
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

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

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .products-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .cases-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .domains-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }
}

@media (max-width: 900px) {
  /* 移动端导航 */
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--navy-900);
    flex-direction: column;
    align-items: stretch;
    padding: 12px 24px 24px;
    gap: 4px;
    transform: translateY(-16px);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s var(--ease);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  }

  .site-nav.open {
    transform: none;
    opacity: 1;
    visibility: visible;
  }

  .nav-link {
    padding: 14px 16px;
    text-align: center;
  }

  /* Hero */
  .hero {
    padding: 80px 0 110px;
  }

  .hero-inner {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }

  .hero-copy .hero-tagline {
    justify-content: center;
  }

  .hero-copy .hero-desc {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-art {
    display: none;
  }

  .hero-stats {
    bottom: -40px;
  }

  .stats-bar {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px 0;
    padding: 28px 12px;
  }

  .stat-item + .stat-item {
    border-left: none;
  }

  .stat-item:nth-child(odd) {
    border-right: 1px solid var(--line);
  }

  /* 双栏 */
  .split {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .split-visual .visual-frame {
    min-height: 260px;
  }

  .section-pad {
    padding: 72px 0;
  }

  .page-hero {
    padding: 72px 0 64px;
  }

  .timeline::before {
    left: 16px;
  }

  .timeline-item,
  .timeline-item:nth-child(even) {
    width: 100%;
    padding: 0 0 40px 44px;
    margin-left: 0;
  }

  .timeline-item::after,
  .timeline-item:nth-child(even)::after {
    left: 8px;
    right: auto;
  }

  .contact-grid {
    grid-template-columns: 1fr;
  }

  .values-grid {
    grid-template-columns: 1fr;
  }

  .steps-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .features-grid,
  .products-grid,
  .cases-grid,
  .domains-grid,
  .steps-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .hero-copy h1 {
    font-size: 32px;
  }

  .btn-lg {
    padding: 14px 30px;
  }
}

/* 减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

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

  * {
    animation: none !important;
    transition: none !important;
  }
}