/* =========================================================
   南阳白河畔文化传媒有限公司 · 企业官网
   设计风格：贴合品牌 Logo · 深青绿 + 天空蓝
   主色 #007080（青绿）｜点缀 #20a0e0（天空蓝）
   ========================================================= */

:root {
  /* 主色系 - 深青绿（取自 Logo） */
  --color-primary: #007080;         /* 青绿 · 主 */
  --color-primary-dark: #004a54;    /* 深青 · 标题/深色块 */
  --color-primary-darker: #00343c;  /* 极深青 · 最深背景 */
  --color-steel: #0e8a9c;           /* 中青 · 辅助过渡 */

  /* 点缀 - 天空蓝（取自 Logo 水纹） */
  --color-accent: #20a0e0;
  --color-accent-light: #4db8e8;
  --color-accent-soft: #e3f4fb;

  /* 背景 */
  --color-bg: #ffffff;
  --color-bg-soft: #f2f8f9;         /* 浅青灰 */
  --color-bg-mist: #e4f1f4;

  /* 文字 */
  --color-text: #0d3b43;            /* 墨青 · 主文字 */
  --color-text-light: #586d75;      /* 青灰 · 次文字 */
  --color-text-faint: #8a99a0;      /* 更淡 */

  /* 线条与分隔 */
  --color-border: #dde8ea;
  --color-border-light: #eaf1f2;

  --color-white: #ffffff;

  /* 阴影 - 偏青绿色调 */
  --shadow-sm: 0 2px 10px rgba(0, 112, 128, 0.07);
  --shadow-md: 0 12px 32px rgba(0, 112, 128, 0.12);
  --shadow-lg: 0 24px 56px rgba(0, 112, 128, 0.16);
  --shadow-xl: 0 32px 72px rgba(0, 112, 128, 0.2);

  --radius: 14px;
  --radius-lg: 22px;
  --radius-xl: 28px;
  --container: 1200px;

  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 116px;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

ul {
  list-style: none;
}

::selection {
  background: rgba(32, 160, 224, 0.28);
  color: var(--color-primary-darker);
}

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

.section {
  padding: 108px 0;
}

.section-soft {
  background: var(--color-bg-soft);
}

.section-title {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--color-primary-dark);
  text-align: center;
  line-height: 1.25;
}

.section-sub {
  text-align: center;
  color: var(--color-text-light);
  max-width: 640px;
  margin: 18px auto 60px;
  font-size: 17px;
  line-height: 1.7;
}

/* 小标签 · 青绿 */
.eyebrow {
  display: inline-block;
  font-size: 13px;
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--color-primary);
  font-weight: 600;
  margin-bottom: 16px;
  position: relative;
  padding-left: 20px;
}

.eyebrow::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 12px;
  height: 1.5px;
  background: var(--color-accent);
  transform: translateY(-50%);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.5px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform 0.28s var(--ease), box-shadow 0.28s var(--ease),
    background 0.28s var(--ease), color 0.28s var(--ease), border-color 0.28s;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-white);
  box-shadow: 0 4px 16px rgba(0, 112, 128, 0.28);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(0, 112, 128, 0.36);
}

.btn-ghost {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-border);
}

.btn-ghost:hover {
  border-color: var(--color-primary);
  color: var(--color-primary-dark);
  transform: translateY(-2px);
}

.btn-light {
  background: var(--color-white);
  color: var(--color-primary-dark);
}

.btn-light:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-accent {
  background: linear-gradient(135deg, var(--color-accent-light), var(--color-accent));
  color: var(--color-white);
  box-shadow: 0 4px 14px rgba(32, 160, 224, 0.3);
}

.btn-accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(32, 160, 224, 0.4);
}

/* ---------- 顶部导航 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s, box-shadow 0.3s, background 0.3s;
}

.site-header.scrolled {
  border-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 104px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 19px;
  color: var(--color-primary-dark);
}

.brand .logo {
  height: 88px;
  width: auto;
  flex: none;
  display: block;
}

.footer-brand .logo {
  height: 64px;
}

.brand .brand-sub {
  font-size: 12px;
  font-weight: 500;
  color: var(--color-text-light);
  letter-spacing: 2px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 36px;
}

.nav-links a {
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.5px;
  color: var(--color-text);
  position: relative;
  padding: 6px 0;
  transition: color 0.25s;
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  border-radius: 2px;
  transition: width 0.35s var(--ease);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-primary);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 14px;
}

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

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-primary-dark);
  border-radius: 2px;
  transition: 0.3s;
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: 180px 0 120px;
  background: linear-gradient(160deg,
      var(--color-primary-darker) 0%,
      var(--color-primary-dark) 40%,
      var(--color-primary) 75%,
      var(--color-steel) 100%);
  color: var(--color-white);
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 85% 20%, rgba(32, 160, 224, 0.28), transparent 55%),
    radial-gradient(circle at 15% 85%, rgba(14, 138, 156, 0.45), transparent 55%),
    radial-gradient(circle at 50% 50%, rgba(0, 112, 128, 0.5), transparent 70%);
  pointer-events: none;
}

/* 细网格纹理，增加质感 */
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 56px 56px;
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 3;
  max-width: 780px;
}

.hero h1 {
  font-size: clamp(36px, 6.5vw, 62px);
  line-height: 1.15;
  font-weight: 700;
  letter-spacing: 1.5px;
  margin-bottom: 24px;
}

.hero h1 .accent {
  color: var(--color-accent-light);
  position: relative;
}

.hero h1 .accent::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 6px;
  width: 100%;
  height: 10px;
  background: rgba(32, 160, 224, 0.28);
  z-index: -1;
  border-radius: 3px;
}

.hero p {
  font-size: clamp(16px, 2vw, 19px);
  color: rgba(255, 255, 255, 0.82);
  max-width: 620px;
  margin-bottom: 40px;
  line-height: 1.85;
}

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

.hero-wave {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  width: 100%;
  line-height: 0;
  z-index: 2;
}

/* ---------- 卡片网格 ---------- */
.grid {
  display: grid;
  gap: 28px;
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

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

.card {
  background: var(--color-white);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius);
  padding: 40px 34px;
  transition: transform 0.32s var(--ease), box-shadow 0.32s var(--ease),
    border-color 0.32s;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-light));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s var(--ease);
}

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

.card:hover::before {
  transform: scaleX(1);
}

.card .icon {
  width: 58px;
  height: 58px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--color-accent-soft), #f0f9fd);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  color: var(--color-primary);
  box-shadow: 0 4px 12px rgba(32, 160, 224, 0.14);
}

.card h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary-dark);
  margin-bottom: 12px;
  letter-spacing: 0.5px;
}

.card p {
  color: var(--color-text-light);
  font-size: 15.5px;
  line-height: 1.75;
}

.card .more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 20px;
  font-weight: 600;
  color: var(--color-primary);
  font-size: 15px;
  transition: gap 0.25s;
  letter-spacing: 0.5px;
}

.card .more:hover {
  gap: 12px;
  color: var(--color-accent);
}

/* ---------- 数据带 ---------- */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}

.stat .num {
  font-size: clamp(34px, 4.5vw, 48px);
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.1;
  letter-spacing: 0.5px;
}

.stat .label {
  color: var(--color-text-light);
  margin-top: 8px;
  font-size: 15px;
  letter-spacing: 0.5px;
}

.stat::after {
  content: "";
  display: block;
  width: 32px;
  height: 2px;
  background: var(--color-accent);
  margin: 12px auto 0;
  border-radius: 2px;
}

/* ---------- 关于段落（图文） ---------- */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 72px;
  align-items: center;
}

.split .visual {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  min-height: 400px;
  background: linear-gradient(150deg, var(--color-primary-dark), var(--color-steel));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: var(--shadow-lg);
}

.split .visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 30%, rgba(32, 160, 224, 0.18), transparent 60%);
  pointer-events: none;
}

.split .visual svg {
  width: 70%;
  opacity: 0.95;
  position: relative;
  z-index: 2;
}

.split-text h2 {
  font-size: clamp(26px, 3.5vw, 38px);
  color: var(--color-primary-dark);
  line-height: 1.28;
  margin-bottom: 22px;
  letter-spacing: 0.5px;
}

.split-text p {
  color: var(--color-text-light);
  margin-bottom: 16px;
  line-height: 1.85;
}

.feature-list {
  margin-top: 26px;
  display: grid;
  gap: 16px;
}

.feature-list li {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  color: var(--color-text);
  font-size: 15.5px;
}

.feature-list .tick {
  flex: none;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--color-accent-soft);
  color: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  margin-top: 3px;
}

/* ---------- 时间线（历程） ---------- */
.timeline {
  display: grid;
  gap: 0;
  position: relative;
  margin-top: 24px;
}

.timeline-item {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 32px;
  padding: 26px 0;
  border-top: 1px solid var(--color-border-light);
  position: relative;
}

.timeline-item:first-child {
  border-top: none;
}

.timeline-item .year {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 1px;
}

.timeline-item h4 {
  font-size: 17px;
  color: var(--color-primary-dark);
  margin-bottom: 6px;
  letter-spacing: 0.5px;
}

.timeline-item p {
  color: var(--color-text-light);
  font-size: 15px;
  line-height: 1.8;
}

/* ---------- 服务详情 ---------- */
.service-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
  padding: 60px 0;
  border-top: 1px solid var(--color-border-light);
}

.service-block:first-child {
  border-top: none;
}

.service-block.reverse .service-visual {
  order: 2;
}

.service-visual {
  border-radius: var(--radius-lg);
  min-height: 320px;
  background: linear-gradient(150deg, var(--color-bg-mist), #d4eaf1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.service-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 70% 30%, rgba(32, 160, 224, 0.12), transparent 60%);
  pointer-events: none;
}

.service-visual svg {
  width: 64%;
  position: relative;
  z-index: 2;
}

.service-info .badge {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 3px;
  color: var(--color-primary);
  font-weight: 600;
  margin-bottom: 14px;
  padding: 4px 12px;
  background: var(--color-accent-soft);
  border-radius: 999px;
}

.service-info h3 {
  font-size: 28px;
  color: var(--color-primary-dark);
  margin-bottom: 16px;
  letter-spacing: 0.5px;
}

.service-info p {
  color: var(--color-text-light);
  margin-bottom: 20px;
  line-height: 1.85;
}

.service-info ul {
  display: grid;
  gap: 12px;
}

.service-info li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  font-size: 15px;
}

.service-info li .dot {
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
  margin-top: 9px;
  box-shadow: 0 0 0 4px rgba(32, 160, 224, 0.15);
}

/* ---------- 流程步骤 ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  counter-reset: step;
}

.step {
  position: relative;
  background: var(--color-white);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius);
  padding: 34px 28px;
  transition: transform 0.32s var(--ease), box-shadow 0.32s;
}

.step:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.step .idx {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 19px;
  margin-bottom: 20px;
  box-shadow: 0 6px 16px rgba(0, 112, 128, 0.24);
}

.step h4 {
  font-size: 17px;
  color: var(--color-primary-dark);
  margin-bottom: 8px;
  letter-spacing: 0.5px;
}

.step p {
  color: var(--color-text-light);
  font-size: 14.5px;
  line-height: 1.75;
}

/* ---------- 联系页 ---------- */
.contact-wrap {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 64px;
}

.contact-info .info-item {
  display: flex;
  gap: 18px;
  padding: 22px 0;
  border-bottom: 1px solid var(--color-border-light);
}

.contact-info .info-item:last-child {
  border-bottom: none;
}

.contact-info .info-icon {
  flex: none;
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--color-accent-soft), #f0f9fd);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(32, 160, 224, 0.14);
}

.contact-info .info-item h4 {
  font-size: 15px;
  color: var(--color-text-light);
  font-weight: 500;
}

.contact-info .info-item p {
  font-size: 17px;
  color: var(--color-primary-dark);
  font-weight: 600;
  letter-spacing: 0.3px;
}

.form-card {
  background: var(--color-white);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 44px;
  box-shadow: var(--shadow-sm);
}

.form-card h3 {
  font-size: 24px;
  color: var(--color-primary-dark);
  margin-bottom: 8px;
  letter-spacing: 0.5px;
}

.form-card .form-hint {
  color: var(--color-text-light);
  font-size: 14.5px;
  margin-bottom: 28px;
}

.field {
  margin-bottom: 22px;
}

.field label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 9px;
  letter-spacing: 0.3px;
}

.field input,
.field textarea,
.field select {
  width: 100%;
  padding: 14px 18px;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  font-size: 15px;
  font-family: inherit;
  color: var(--color-text);
  background: var(--color-bg-soft);
  transition: border-color 0.25s, box-shadow 0.25s, background 0.25s;
}

.field input:focus,
.field textarea:focus,
.field select:focus {
  outline: none;
  border-color: var(--color-accent);
  background: #fff;
  box-shadow: 0 0 0 4px rgba(32, 160, 224, 0.16);
}

.field textarea {
  resize: vertical;
  min-height: 130px;
}

.field .err {
  display: none;
  color: #b4402f;
  font-size: 13px;
  margin-top: 6px;
}

.field.invalid input,
.field.invalid textarea {
  border-color: #e0746a;
  background: #fdf4f2;
}

.field.invalid .err {
  display: block;
}

.form-note {
  font-size: 13px;
  color: var(--color-text-faint);
  margin-top: 16px;
  text-align: center;
}

.form-success {
  display: none;
  text-align: center;
  padding: 32px 10px;
}

.form-success.show {
  display: block;
}

.form-success .check {
  width: 68px;
  height: 68px;
  border-radius: 50%;
  background: #e6f7ee;
  color: #1e9e5a;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
}

/* ---------- CTA 横幅 ---------- */
.cta {
  background: linear-gradient(150deg, var(--color-primary-darker), var(--color-primary-dark), var(--color-steel));
  border-radius: var(--radius-xl);
  padding: 72px 64px;
  text-align: center;
  color: #fff;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.cta::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 20% 30%, rgba(32, 160, 224, 0.22), transparent 55%),
    radial-gradient(circle at 80% 80%, rgba(14, 138, 156, 0.45), transparent 50%);
  pointer-events: none;
}

.cta h2 {
  font-size: clamp(28px, 4vw, 40px);
  margin-bottom: 18px;
  letter-spacing: 1px;
  position: relative;
  z-index: 2;
}

.cta p {
  color: rgba(255, 255, 255, 0.85);
  max-width: 560px;
  margin: 0 auto 32px;
  line-height: 1.85;
  position: relative;
  z-index: 2;
}

.cta .btn {
  position: relative;
  z-index: 2;
}

/* ---------- 页脚 ---------- */
.site-footer {
  background: var(--color-primary-darker);
  color: rgba(255, 255, 255, 0.75);
  padding: 72px 0 32px;
  position: relative;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand .brand {
  color: #fff;
  margin-bottom: 18px;
}

.footer-brand p {
  font-size: 14.5px;
  max-width: 300px;
  line-height: 1.8;
}

.footer-col h4 {
  color: #fff;
  font-size: 16px;
  margin-bottom: 20px;
  font-weight: 600;
  letter-spacing: 1px;
}

.footer-col a,
.footer-col li {
  display: block;
  font-size: 14.5px;
  color: rgba(255, 255, 255, 0.7);
  padding: 7px 0;
  transition: color 0.2s, padding-left 0.2s;
}

.footer-col a:hover {
  color: var(--color-accent-light);
  padding-left: 6px;
}

.footer-social {
  display: flex;
  gap: 12px;
  margin-top: 20px;
}

.footer-social a {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.25s, transform 0.25s;
}

.footer-social a:hover {
  background: rgba(32, 160, 224, 0.25);
  transform: translateY(-2px);
}

.footer-bottom {
  padding-top: 28px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 13.5px;
  color: rgba(255, 255, 255, 0.55);
}

.footer-bottom a {
  color: rgba(255, 255, 255, 0.7);
  transition: color 0.2s;
}

.footer-bottom a:hover {
  color: var(--color-accent-light);
}

/* ---------- 滚动揭示动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.75s var(--ease), transform 0.75s var(--ease);
}

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

.reveal.d1 { transition-delay: 0.08s; }
.reveal.d2 { transition-delay: 0.16s; }
.reveal.d3 { transition-delay: 0.24s; }
.reveal.d4 { transition-delay: 0.32s; }

/* ---------- 响应式 ---------- */
@media (max-width: 980px) {
  .grid-3 { grid-template-columns: 1fr 1fr; }
  .stats { grid-template-columns: 1fr 1fr; gap: 40px 24px; }
  .steps { grid-template-columns: 1fr 1fr; }
  .split,
  .service-block,
  .contact-wrap { grid-template-columns: 1fr; gap: 44px; }
  .service-block.reverse .service-visual { order: 0; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 36px; }
}

@media (max-width: 720px) {
  .section { padding: 76px 0; }
  .nav { height: auto; min-height: 56px; padding: 10px 0; }
  .brand .logo { height: 44px; }
  .nav-links {
    position: fixed;
    top: 56px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: #fff;
    padding: 12px 24px 24px;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    transform: translateY(-120%);
    transition: transform 0.35s var(--ease);
  }
  .nav-links.open { transform: translateY(0); }
  .nav-links a { width: 100%; padding: 14px 0; border-bottom: 1px solid var(--color-border-light); }
  .nav-links a::after { display: none; }
  .nav-links .btn { margin-top: 14px; width: 100%; justify-content: center; }
  .nav-toggle { display: flex; }
  .nav-cta .btn { display: none; }
  .grid-3 { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .timeline-item { grid-template-columns: 1fr; gap: 6px; }
  .cta { padding: 48px 28px; }
  .form-card { padding: 32px 24px; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero { padding: 140px 0 92px; }
  .footer-brand .logo { height: 56px; }
  html { scroll-padding-top: 68px; }
}