/* ========================================
   悦荐网络 · 企业官网样式
   品牌主色 #5f39ff · 无外部依赖
   ======================================== */

:root {
  /* 品牌主色 */
  --color-primary: #5f39ff;
  --color-primary-light: #7b5cff;
  --color-primary-dark: #4528cc;
  --color-accent: #5f39ff;
  --color-accent-hover: #4528cc;
  --color-accent-soft: rgba(95, 57, 255, 0.1);

  /* 中性色 */
  --color-bg: #f8fafc;
  --color-bg-alt: #f1f5f9;
  --color-surface: #ffffff;
  --color-text: #0f172a;
  --color-text-secondary: #475569;
  --color-text-muted: #94a3b8;
  --color-border: #e2e8f0;

  /* 间距 */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;

  /* 圆角 */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;

  /* 阴影 */
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 4px 20px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 12px 40px rgba(15, 23, 42, 0.12);

  /* 动画 */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --duration: 0.4s;

  /* 布局 */
  --header-height: 72px;
  --container-max: 1200px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  overflow-x: hidden;
}

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

ul {
  list-style: none;
}

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

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* ========================================
   导航
   ======================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  transition: background var(--duration) var(--ease-out),
              box-shadow var(--duration) var(--ease-out);
}

.header.scrolled {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.logo-img {
  height: 46px;
  width: auto;
  display: block;
  object-fit: contain;
  transition: opacity var(--duration) var(--ease-out);
}

.logo:hover .logo-img {
  opacity: 0.85;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-link {
  position: relative;
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  font-weight: 500;
  transition: color var(--duration) var(--ease-out);
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--duration) var(--ease-out);
}

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

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

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: transform var(--duration) var(--ease-out),
              opacity var(--duration) var(--ease-out);
}

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

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

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

/* ========================================
   按钮
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.75rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--duration) var(--ease-out);
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(95, 57, 255, 0.35);
}

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

.btn-outline:hover {
  border-color: var(--color-primary);
  background: var(--color-primary);
  color: #fff;
  transform: translateY(-2px);
}

.btn-full {
  width: 100%;
}

/* ========================================
   Hero
   ======================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--header-height);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  background: #f8fafc;
}

.hero-bg-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center center;
}

.hero-bg-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(105deg, rgba(255, 255, 255, 0.92) 0%, rgba(255, 255, 255, 0.75) 35%, rgba(255, 255, 255, 0.2) 65%, transparent 100%),
    linear-gradient(to bottom, transparent 70%, var(--color-bg) 100%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  padding: var(--space-xl) 0;
  max-width: 640px;
}

.hero-label {
  display: inline-block;
  padding: 0.4rem 1rem;
  background: var(--color-accent-soft);
  color: var(--color-accent);
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: 100px;
  margin-bottom: var(--space-md);
  letter-spacing: 0.05em;
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1.15;
  color: var(--color-primary);
  margin-bottom: var(--space-md);
}

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

.hero-highlight::after {
  content: "";
  position: absolute;
  bottom: 4px;
  left: 0;
  width: 100%;
  height: 12px;
  background: rgba(95, 57, 255, 0.18);
  z-index: -1;
  border-radius: 2px;
  animation: underline-grow 1s var(--ease-out) 0.8s both;
}

@keyframes underline-grow {
  from { width: 0; }
  to { width: 100%; }
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--color-text-secondary);
  max-width: 540px;
  margin-bottom: var(--space-lg);
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
  margin-bottom: var(--space-xl);
}

.hero-stats {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  padding: var(--space-md) var(--space-lg);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(8px);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(255, 255, 255, 0.6);
  width: fit-content;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.stat-number {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
}

.stat-suffix {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-left: 2px;
}

.stat-item {
  flex-direction: row;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0 2px;
}

.stat-label {
  width: 100%;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-top: 0.25rem;
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--color-border);
}

.hero-scroll {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-text-muted);
  font-size: 0.8rem;
  animation: bounce 2s ease-in-out infinite;
}

.scroll-indicator {
  width: 20px;
  height: 32px;
  border: 2px solid var(--color-border);
  border-radius: 10px;
  position: relative;
}

.scroll-indicator::after {
  content: "";
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 8px;
  background: var(--color-accent);
  border-radius: 2px;
  animation: scroll-dot 2s ease-in-out infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(6px); }
}

@keyframes scroll-dot {
  0%, 100% { opacity: 1; top: 6px; }
  50% { opacity: 0.3; top: 14px; }
}

/* ========================================
   通用区块
   ======================================== */
.section {
  padding: var(--space-2xl) 0;
}

.section-header {
  margin-bottom: var(--space-xl);
}

.section-header--center {
  text-align: center;
}

.section-header--center .section-desc {
  margin: var(--space-sm) auto 0;
}

.section-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.25;
}

.section-desc {
  color: var(--color-text-secondary);
  max-width: 520px;
  margin-top: var(--space-sm);
}

/* Reveal 动画 */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========================================
   关于我们
   ======================================== */
.about {
  background: var(--color-surface);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
}

.about-visual {
  position: relative;
}

.about-card {
  position: relative;
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  overflow: hidden;
  transition: transform var(--duration) var(--ease-out);
}

.about-card:hover {
  transform: translateY(-4px);
}

.about-card-accent {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
}

.about-icon {
  width: 64px;
  height: 64px;
  color: var(--color-primary);
  margin-bottom: var(--space-md);
}

.about-card-text {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.6;
}

.about-dots {
  position: absolute;
  top: -20px;
  right: -20px;
  width: 120px;
  height: 120px;
  background-image: radial-gradient(var(--color-border) 2px, transparent 2px);
  background-size: 16px 16px;
  opacity: 0.6;
}

.about-lead {
  font-size: 1.15rem;
  color: var(--color-text);
  font-weight: 500;
  margin-bottom: var(--space-md);
  line-height: 1.8;
}

.about-text {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
  line-height: 1.8;
}

.about-features {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.feature-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm);
  border-radius: var(--radius-sm);
  transition: background var(--duration) var(--ease-out),
              transform var(--duration) var(--ease-out);
}

.feature-item:hover {
  background: var(--color-bg);
  transform: translateX(8px);
}

.feature-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: var(--color-accent-soft);
  color: var(--color-accent);
  border-radius: 50%;
  font-size: 0.75rem;
  font-weight: 700;
  flex-shrink: 0;
}

/* ========================================
   服务
   ======================================== */
.services {
  background: var(--color-bg);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
}

.service-card {
  position: relative;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.12);
  transition: transform 0.45s var(--ease-out), box-shadow 0.45s var(--ease-out), border-color 0.45s var(--ease-out);
  cursor: default;
  overflow: hidden;
  min-height: 280px;
}

.service-card-bg {
  position: absolute;
  inset: 0;
  background-image: url('../static/anlibeijing.jpg');
  background-size: cover;
  background-position: center;
  transition: transform 0.6s var(--ease-out);
}

.service-card:nth-child(1) .service-card-bg { background-position: 20% center; }
.service-card:nth-child(2) .service-card-bg { background-position: 40% center; }
.service-card:nth-child(3) .service-card-bg { background-position: 60% center; }
.service-card:nth-child(4) .service-card-bg { background-position: 80% center; }

.service-card-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  transition: background 0.45s var(--ease-out);
}

.service-card-body {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  height: 100%;
  min-height: 280px;
  padding: var(--space-lg);
  transition: transform 0.45s var(--ease-out);
}

.service-card:hover {
  transform: translateY(-10px);
  border-color: rgba(95, 57, 255, 0.5);
  box-shadow: 0 20px 40px rgba(15, 23, 42, 0.3), 0 8px 20px rgba(95, 57, 255, 0.2);
}

.service-card:hover .service-card-bg {
  transform: scale(1.1);
}

.service-card:hover .service-card-overlay {
  background: rgba(0, 0, 0, 0.3);
}

.service-card:hover .service-card-body {
  transform: translateY(-2px);
}

.service-card:hover .service-icon {
  background: rgba(255, 255, 255, 0.2);
  color: #fff;
  transform: translateY(-4px) scale(1.05);
}

.service-card:hover .service-title {
  transform: translateY(-2px);
}

.service-card:hover .service-link {
  color: #fff;
  transform: translateX(6px);
}

.service-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  align-self: center;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  color: #fff;
  margin-bottom: var(--space-md);
  transition: all 0.45s var(--ease-out);
}

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

.service-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: var(--space-xs);
  transition: transform 0.45s var(--ease-out);
}

.service-desc {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.75);
  line-height: 1.7;
  margin-bottom: var(--space-md);
  flex: 1;
}

.service-link {
  font-size: 0.85rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.55);
  display: inline-block;
  transition: all 0.45s var(--ease-out);
}

/* ========================================
   主营业务
   ======================================== */
.business {
  background: var(--color-surface);
}

.business-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

.business-card {
  position: relative;
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  transition: all var(--duration) var(--ease-out);
  overflow: hidden;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.78), rgba(255, 255, 255, 0.78)),
    url('../static/youshi_bg.jpg');
  background-size: cover;
  background-position: center;
}

.business-card:nth-child(1) { background-position: center, 15% center; }
.business-card:nth-child(2) { background-position: center, 40% center; }
.business-card:nth-child(3) { background-position: center, 65% center; }
.business-card:nth-child(4) { background-position: center, 90% center; }

.business-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 0;
  background: var(--color-accent);
  transition: height 0.5s var(--ease-out);
  z-index: 1;
}

.business-card > * {
  position: relative;
  z-index: 2;
}

.business-card:hover {
  border-color: transparent;
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.62), rgba(255, 255, 255, 0.62)),
    url('../static/youshi_bg.png');
}

.business-card:hover::before {
  height: 100%;
}

.business-num {
  display: inline-block;
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-border);
  line-height: 1;
  margin-bottom: var(--space-sm);
  transition: color var(--duration) var(--ease-out);
}

.business-card:hover .business-num {
  color: var(--color-accent-soft);
}

.business-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
}

.business-desc {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-md);
}

.business-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.business-tags li {
  padding: 0.3rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-primary-light);
  background: rgba(95, 57, 255, 0.08);
  border-radius: 100px;
  transition: all var(--duration) var(--ease-out);
}

.business-card:hover .business-tags li {
  background: var(--color-accent-soft);
  color: var(--color-accent);
}

/* 技术能力栈 */
.tech-section {
  position: relative;
  text-align: center;
  padding: var(--space-xl) var(--space-lg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  overflow: hidden;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.82), rgba(255, 255, 255, 0.82)),
    url('../static/jishuzhan_bg.jpeg');
  background-size: cover;
  background-position: center;
  transition: background 0.45s var(--ease-out);
}

.tech-section:hover {
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.7), rgba(255, 255, 255, 0.7)),
    url('../static/jishuzhan_bg.jpeg');
}

.tech-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
}

.tech-desc {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
}

.tech-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.6rem;
}

.tech-tag {
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: all var(--duration) var(--ease-out);
  cursor: default;
}

.tech-tag:hover {
  color: var(--color-primary);
  border-color: var(--color-primary-light);
  background: rgba(95, 57, 255, 0.06);
  transform: translateY(-2px);
}

/* ========================================
   案例
   ======================================== */
.cases {
  background: var(--color-surface);
}

.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.case-card {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  transition: all var(--duration) var(--ease-out);
}

.case-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.case-card:hover .case-image {
  transform: scale(1.05);
}

.case-image {
  position: relative;
  height: 200px;
  overflow: hidden;
  transition: transform 0.6s var(--ease-out);
}

/* 案例占位背景 - 可替换为真实图片 */
.case-image--1 {
  background: url('../static/qiyeguanlixit.jpg') center / cover no-repeat;
}

.case-image--2 {
  background: url('../static/app.jpg') center / cover no-repeat;
}

.case-image--3 {
  background: url('../static/xiaochengxu.jpg') center / cover no-repeat;
}

.case-image::before {
  content: "";
  position: absolute;
  inset: 0;
  background: 
    repeating-linear-gradient(
      45deg,
      transparent,
      transparent 10px,
      rgba(255,255,255,0.03) 10px,
      rgba(255,255,255,0.03) 20px
    );
}

.case-tag {
  position: absolute;
  top: var(--space-sm);
  left: var(--space-sm);
  padding: 0.3rem 0.75rem;
  background: rgba(255, 255, 255, 0.95);
  color: var(--color-primary);
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 100px;
}

.case-body {
  padding: var(--space-md);
}

.case-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
}

.case-desc {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ========================================
   联系我们
   ======================================== */
.contact {
  background: var(--color-bg-alt);
}

.contact-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: start;
}

.contact-desc {
  color: var(--color-text-secondary);
  margin: var(--space-md) 0 var(--space-lg);
  line-height: 1.8;
}

.contact-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.contact-list li {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.contact-label {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
}

.contact-form {
  background: var(--color-surface);
  padding: var(--space-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.form-group {
  margin-bottom: var(--space-md);
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.4rem;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 0.95rem;
  font-family: inherit;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  color: var(--color-text);
  transition: border-color var(--duration) var(--ease-out),
              box-shadow var(--duration) var(--ease-out);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary-light);
  box-shadow: 0 0 0 3px rgba(95, 57, 255, 0.15);
}

.form-group textarea {
  resize: vertical;
  min-height: 100px;
}

.form-note {
  margin-top: var(--space-sm);
  font-size: 0.85rem;
  text-align: center;
  min-height: 1.2em;
  transition: color var(--duration) var(--ease-out);
}

.form-note.success {
  color: #059669;
}

/* ========================================
   页脚
   ======================================== */
.footer {
  background: var(--color-text);
  color: rgba(255, 255, 255, 0.65);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.5rem 1.5rem;
  padding: 1rem var(--space-md);
}

.footer-bottom p {
  font-size: 0.8rem;
  margin: 0;
}

.footer-beian a {
  color: rgba(255, 255, 255, 0.55);
  transition: color var(--duration) var(--ease-out);
}

.footer-beian a:hover {
  color: rgba(255, 255, 255, 0.85);
}

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

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

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-surface);
    flex-direction: column;
    padding: var(--space-md);
    gap: 0;
    box-shadow: var(--shadow-md);
    transform: translateY(-120%);
    opacity: 0;
    transition: transform var(--duration) var(--ease-out),
                opacity var(--duration) var(--ease-out);
    pointer-events: none;
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-links li {
    width: 100%;
  }

  .nav-link {
    display: block;
    padding: var(--space-sm) 0;
    border-bottom: 1px solid var(--color-border);
  }

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

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

  .hero-stats {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
  }

  .stat-divider {
    width: 100%;
    height: 1px;
  }

  .hero-scroll {
    display: none;
  }

  .hero-bg-overlay {
    background:
      linear-gradient(180deg, rgba(255, 255, 255, 0.9) 0%, rgba(255, 255, 255, 0.7) 60%, var(--color-bg) 100%);
  }

  .hero-content {
    max-width: 100%;
  }
}

@media (max-width: 480px) {
  .services-grid {
    grid-template-columns: 1fr;
  }

  .hero-actions {
    flex-direction: column;
  }

  .hero-actions .btn {
    width: 100%;
  }
}

/* 减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }

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