/* ================================================================
   润玺档案科技 — 企业官网样式表
   设计理念：专业、稳重、清透，冷白+青绿色调
   ================================================================ */

/* ===== CSS 变量 ===== */
:root {
  /* 背景色 */
  --color-bg: #F7FAFB;
  --color-surface: #FFFFFF;
  --color-surface-alt: #EDF3F4;
  --color-surface-tint: #F0F6F6;

  /* 文字色 */
  --color-text-primary: #1A2B33;
  --color-text-secondary: #5A6B73;
  --color-text-muted: #8A9BA3;
  --color-text-inverse: #FFFFFF;

  /* 品牌色 */
  --color-primary: #0A6E6E;
  --color-primary-light: #0D8888;
  --color-primary-lighter: #14A6A6;
  --color-primary-dark: #065050;
  --color-secondary: #3B8DA4;
  --color-accent: #C8503E;

  /* 边框色 */
  --color-border: #E0E8EA;
  --color-border-light: #EDF3F4;

  /* 阴影 */
  --shadow-xs: 0 1px 2px rgba(10, 80, 80, 0.04);
  --shadow-sm: 0 2px 8px rgba(10, 80, 80, 0.06);
  --shadow-md: 0 4px 16px rgba(10, 80, 80, 0.08);
  --shadow-lg: 0 8px 32px rgba(10, 80, 80, 0.12);
  --shadow-xl: 0 16px 48px rgba(10, 80, 80, 0.15);

  /* 圆角 */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;

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

  /* 过渡 */
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);

  /* 字体 */
  --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC",
    "Helvetica Neue", Arial, sans-serif;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-stack);
  color: var(--color-text-primary);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition);
}

ul { list-style: none; }

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

/* ===== 通用布局 ===== */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 90px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-eyebrow {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-primary);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 14px;
  position: relative;
  padding-left: 28px;
}

.section-eyebrow::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  height: 2px;
  background: var(--color-primary-lighter);
  border-radius: 1px;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-text-primary);
  line-height: 1.4;
  letter-spacing: 0.02em;
}

.section-subtitle {
  margin-top: 14px;
  font-size: 1.0625rem;
  color: var(--color-text-secondary);
  font-weight: 400;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
  letter-spacing: 0.03em;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

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

.btn-outline:hover {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  transform: translateY(-1px);
}

/* ===== 头部导航 ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  z-index: 1000;
  transition: all var(--transition);
}

.site-header.scrolled {
  background: rgba(255, 255, 255, 0.95);
  border-bottom-color: var(--color-border);
  box-shadow: var(--shadow-xs);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.logo-text {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text-primary);
  letter-spacing: 0.04em;
}

.main-nav {
  flex: 1;
  display: flex;
  justify-content: center;
}

.nav-list {
  display: flex;
  gap: 8px;
}

.nav-link {
  display: block;
  padding: 8px 16px;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  position: relative;
}

.nav-link:hover {
  color: var(--color-primary);
  background: var(--color-surface-tint);
}

.nav-link.active {
  color: var(--color-primary);
  font-weight: 600;
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 2px;
  background: var(--color-primary-lighter);
  border-radius: 1px;
}

.header-contact {
  flex-shrink: 0;
}

.header-phone {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-primary);
  padding: 8px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition);
}

.header-phone:hover {
  background: var(--color-surface-tint);
  border-color: var(--color-primary-lighter);
}

.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.menu-toggle span {
  width: 22px;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: 1px;
  transition: all var(--transition);
  margin: 0 auto;
}

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

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

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

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 100px 0 60px;
  background: linear-gradient(170deg, #F7FAFB 0%, #EAF2F3 50%, #F0F6F6 100%);
  overflow: hidden;
}

.hero-bg-decor {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.hero-decor-svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-content {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 60px;
}

.hero-text {
  flex: 1;
  max-width: 640px;
}

.hero-eyebrow {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-primary);
  letter-spacing: 0.15em;
  margin-bottom: 20px;
  padding: 6px 16px;
  background: rgba(10, 110, 110, 0.06);
  border-radius: 20px;
}

.hero-title {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.3;
  color: var(--color-text-primary);
  margin-bottom: 24px;
  letter-spacing: 0.02em;
}

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

.hero-title .accent::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 0;
  right: 0;
  height: 8px;
  background: rgba(20, 166, 166, 0.15);
  border-radius: 4px;
  z-index: -1;
}

.hero-subtitle {
  font-size: 1.0625rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: 36px;
  max-width: 560px;
}

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

.hero-visual {
  flex: 0 0 420px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-illustration {
  width: 100%;
  max-width: 420px;
  height: auto;
  filter: drop-shadow(0 8px 24px rgba(10, 80, 80, 0.06));
}

.scroll-indicator {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  color: var(--color-text-muted);
  animation: bounce 2s infinite;
  z-index: 1;
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

/* ===== 核心能力 ===== */
.capabilities {
  background: var(--color-surface);
}

.capabilities-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.capability-card {
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  transition: all var(--transition);
  overflow: hidden;
}

.capability-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-lighter));
  opacity: 0;
  transition: opacity var(--transition);
}

.capability-card:hover {
  border-color: var(--color-primary-lighter);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.capability-card:hover::before {
  opacity: 1;
}

.capability-card--featured {
  background: linear-gradient(180deg, #F0F8F8 0%, #FFFFFF 100%);
  border-color: var(--color-primary-lighter);
}

.capability-card--featured::before {
  opacity: 1;
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light), var(--color-secondary));
}

.capability-badge {
  position: absolute;
  top: 20px;
  right: 20px;
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--color-primary);
  background: rgba(10, 110, 110, 0.08);
  padding: 4px 12px;
  border-radius: 12px;
  letter-spacing: 0.05em;
}

.capability-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(10, 110, 110, 0.08), rgba(20, 166, 166, 0.08));
  border-radius: var(--radius-md);
  color: var(--color-primary);
  margin-bottom: 24px;
}

.capability-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: 12px;
}

.capability-desc {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
}

.capability-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.capability-list li {
  position: relative;
  padding-left: 20px;
  font-size: 0.875rem;
  color: var(--color-text-primary);
  line-height: 1.5;
}

.capability-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  background: var(--color-primary-lighter);
  border-radius: 50%;
}

.capability-list--double {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px 16px;
}

/* ===== 典型方案 ===== */
.solutions {
  background: var(--color-bg);
}

.solutions-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.solution-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
}

.solution-card:hover {
  border-color: var(--color-primary-lighter);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.solution-icon {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(10, 110, 110, 0.06);
  border-radius: var(--radius-md);
  color: var(--color-primary);
  margin-bottom: 20px;
  transition: all var(--transition);
}

.solution-card:hover .solution-icon {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

.solution-title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: 10px;
  line-height: 1.5;
}

.solution-desc {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ===== 项目实施逻辑 ===== */
.process {
  background: var(--color-surface);
}

.process-flow {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 0;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.process-step {
  flex: 1;
  min-width: 200px;
  max-width: 260px;
  text-align: center;
  padding: 0 16px;
  position: relative;
}

.step-number {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-primary-lighter);
  letter-spacing: 0.15em;
  margin-bottom: 12px;
}

.step-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(10, 110, 110, 0.06), rgba(59, 141, 164, 0.06));
  border: 2px solid var(--color-border-light);
  border-radius: 50%;
  color: var(--color-primary);
  transition: all var(--transition);
}

.process-step:hover .step-icon {
  border-color: var(--color-primary-lighter);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  transform: scale(1.05);
}

.step-title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: 10px;
}

.step-desc {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.process-connector {
  flex: 0 0 60px;
  height: 2px;
  background: linear-gradient(90deg, var(--color-border), var(--color-primary-lighter), var(--color-border));
  margin-top: 64px;
  border-radius: 1px;
  position: relative;
}

.process-connector::after {
  content: '';
  position: absolute;
  right: -4px;
  top: -4px;
  width: 10px;
  height: 10px;
  border-top: 2px solid var(--color-primary-lighter);
  border-right: 2px solid var(--color-primary-lighter);
  transform: rotate(45deg);
}

.process-principles {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.principle-tag {
  display: inline-flex;
  align-items: center;
  padding: 10px 24px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-primary);
  background: rgba(10, 110, 110, 0.06);
  border: 1px solid rgba(10, 110, 110, 0.12);
  border-radius: 24px;
  letter-spacing: 0.03em;
}

/* ===== 产品与服务 ===== */
.products {
  background: var(--color-surface-alt);
}

.product-showcase {
  display: flex;
  align-items: stretch;
  gap: 48px;
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  padding: 48px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border-light);
}

.product-info {
  flex: 1;
}

.product-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-primary);
  background: rgba(10, 110, 110, 0.08);
  padding: 5px 14px;
  border-radius: 16px;
  margin-bottom: 16px;
  letter-spacing: 0.03em;
}

.product-name {
  font-size: 1.625rem;
  font-weight: 800;
  color: var(--color-text-primary);
  margin-bottom: 12px;
  line-height: 1.3;
}

.product-positioning {
  font-size: 1rem;
  color: var(--color-secondary);
  margin-bottom: 28px;
  line-height: 1.7;
  font-weight: 500;
}

.product-features {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 24px;
}

.feature-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.9375rem;
  color: var(--color-text-primary);
  line-height: 1.6;
}

.feature-check {
  flex-shrink: 0;
  color: var(--color-primary);
  margin-top: 2px;
}

.product-disclaimer {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  padding: 14px 18px;
  background: var(--color-surface-tint);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--color-primary-lighter);
}

.product-visual {
  flex: 0 0 340px;
  display: flex;
  align-items: center;
}

.product-visual-card {
  width: 100%;
  background: linear-gradient(160deg, #0A4A4A 0%, #0A6E6E 100%);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.pvc-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 18px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.pvc-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
}

.pvc-dot:first-child { background: rgba(255, 255, 255, 0.3); }

.pvc-label {
  margin-left: auto;
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.5);
  font-weight: 500;
  letter-spacing: 0.05em;
}

.pvc-body {
  padding: 24px 20px;
}

.pvc-row {
  margin-bottom: 14px;
}

.pvc-bar {
  height: 8px;
  border-radius: 4px;
  background: rgba(20, 166, 166, 0.6);
}

.pvc-bar--alt {
  background: rgba(59, 141, 164, 0.5);
}

.pvc-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}

.pvc-tag {
  font-size: 0.6875rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.7);
  background: rgba(255, 255, 255, 0.08);
  padding: 4px 10px;
  border-radius: 12px;
  letter-spacing: 0.03em;
}

.pvc-footer {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.pvc-status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #14A6A6;
  box-shadow: 0 0 8px rgba(20, 166, 166, 0.6);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.pvc-status-text {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.5);
  letter-spacing: 0.03em;
}

.products-extension-note {
  text-align: center;
  margin-top: 40px;
  padding: 24px;
  background: var(--color-surface);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
}

.products-extension-note p {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: 10px;
}

.extension-placeholder {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-primary);
  background: rgba(10, 110, 110, 0.06);
  padding: 5px 16px;
  border-radius: 16px;
}

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

.about-content {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 56px;
  align-items: start;
}

.about-text p {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.9;
  margin-bottom: 18px;
}

.about-text p:first-child {
  font-size: 1rem;
  color: var(--color-text-primary);
  font-weight: 500;
}

.about-highlights {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.highlight-card {
  background: var(--color-surface-tint);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 24px 20px;
  transition: all var(--transition);
}

.highlight-card:hover {
  border-color: var(--color-primary-lighter);
  box-shadow: var(--shadow-sm);
}

.highlight-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface);
  border-radius: var(--radius-sm);
  color: var(--color-primary);
  margin-bottom: 14px;
}

.highlight-card h4 {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: 8px;
}

.highlight-card p {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.about-extension {
  text-align: center;
  margin-top: 40px;
  padding: 32px;
  background: var(--color-surface-tint);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
}

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

.contact-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  max-width: 800px;
  margin: 0 auto;
}

.contact-card {
  display: flex;
  align-items: center;
  gap: 24px;
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  transition: all var(--transition);
}

.contact-card:hover {
  border-color: var(--color-primary-lighter);
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
}

.contact-icon {
  flex-shrink: 0;
  width: 72px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(10, 110, 110, 0.08), rgba(59, 141, 164, 0.08));
  border-radius: var(--radius-md);
  color: var(--color-primary);
  transition: all var(--transition);
}

.contact-card:hover .contact-icon {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

.contact-info {
  flex: 1;
}

.contact-label {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-bottom: 6px;
  letter-spacing: 0.05em;
}

.contact-value {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: 4px;
  word-break: break-all;
}

.contact-hint {
  font-size: 0.75rem;
  color: var(--color-primary-lighter);
  font-weight: 500;
}

.contact-scope {
  text-align: center;
  margin-top: 40px;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 2;
}

/* ===== 页脚 ===== */
.site-footer {
  background: #0A3A3A;
  color: rgba(255, 255, 255, 0.7);
  padding: 64px 0 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.2fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand {
  max-width: 320px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}

.footer-logo span {
  font-size: 1.125rem;
  font-weight: 700;
  color: #FFFFFF;
  letter-spacing: 0.04em;
}

.footer-desc {
  font-size: 0.8125rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.5);
}

.footer-heading {
  font-size: 0.9375rem;
  font-weight: 600;
  color: #FFFFFF;
  margin-bottom: 18px;
  letter-spacing: 0.03em;
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.6);
  transition: color var(--transition);
}

.footer-links a:hover {
  color: var(--color-primary-lighter);
}

.footer-contact-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.footer-contact-static {
  cursor: default;
}

.footer-soon {
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.35);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 24px;
  text-align: center;
}

.footer-bottom p {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.4);
  line-height: 1.8;
}

.footer-bottom a {
  color: rgba(255, 255, 255, 0.4);
  transition: color var(--transition);
}

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

.footer-icp a {
  font-size: 0.75rem;
}

/* ===== 返回顶部 ===== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition);
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* ===== 滚动动画 ===== */
[data-reveal] {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-reveal].revealed {
  opacity: 1;
  transform: translateY(0);
}

/* ===== 响应式：平板 ===== */
@media (max-width: 1024px) {
  .section { padding: 70px 0; }

  .section-title { font-size: 1.625rem; }

  .hero-title { font-size: 2.5rem; }

  .hero-content {
    flex-direction: column;
    text-align: center;
    gap: 40px;
  }

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

  .hero-subtitle { margin: 0 auto 36px; }

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

  .hero-visual { flex: 0 0 auto; width: 100%; max-width: 380px; }

  .capabilities-grid {
    grid-template-columns: 1fr;
    max-width: 560px;
    margin: 0 auto;
  }

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

  .process-flow {
    flex-direction: column;
    align-items: center;
    gap: 20px;
  }

  .process-step {
    max-width: 400px;
  }

  .process-connector {
    flex: 0 0 auto;
    width: 2px;
    height: 40px;
    margin: 0;
    background: linear-gradient(180deg, var(--color-border), var(--color-primary-lighter), var(--color-border));
  }

  .process-connector::after {
    right: -4px;
    bottom: -4px;
    top: auto;
    transform: rotate(135deg);
  }

  .product-showcase {
    flex-direction: column;
    gap: 32px;
    padding: 36px;
  }

  .product-visual {
    flex: 0 0 auto;
    width: 100%;
    max-width: 340px;
    margin: 0 auto;
  }

  .about-content {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .footer-brand { grid-column: 1 / -1; max-width: 100%; }
}

/* ===== 响应式：手机 ===== */
@media (max-width: 768px) {
  .section { padding: 56px 0; }

  .container { padding: 0 20px; }

  .section-header { margin-bottom: 40px; }

  .section-title { font-size: 1.375rem; }

  .section-subtitle { font-size: 0.9375rem; }

  /* 导航 */
  .header-contact { display: none; }

  .menu-toggle { display: flex; }

  .main-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition);
  }

  .main-nav.open {
    max-height: 400px;
  }

  .nav-list {
    flex-direction: column;
    padding: 16px 20px;
    gap: 4px;
  }

  .nav-link {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
  }

  .nav-link.active::after { display: none; }

  /* Hero */
  .hero { min-height: auto; padding: 120px 0 48px; }

  .hero-title { font-size: 1.875rem; }

  .hero-subtitle { font-size: 0.9375rem; }

  .hero-actions { flex-direction: column; width: 100%; }

  .btn { width: 100%; }

  .hero-visual { max-width: 300px; }

  /* Solutions */
  .solutions-grid { grid-template-columns: 1fr; }

  /* Process */
  .process-principles { gap: 10px; }

  .principle-tag { padding: 8px 18px; font-size: 0.8125rem; }

  /* Product */
  .product-showcase { padding: 24px; border-radius: var(--radius-lg); }

  .product-name { font-size: 1.375rem; }

  /* About */
  .about-highlights { grid-template-columns: 1fr; }

  /* Contact */
  .contact-cards { grid-template-columns: 1fr; gap: 16px; }

  .contact-card { padding: 28px 24px; gap: 18px; }

  .contact-icon { width: 56px; height: 56px; }

  .contact-value { font-size: 1.125rem; }

  /* Footer */
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }

  .footer-bottom p { font-size: 0.6875rem; }

  /* Back to top */
  .back-to-top { bottom: 20px; right: 20px; width: 40px; height: 40px; }
}

/* ===== 响应式：小手机 ===== */
@media (max-width: 480px) {
  .hero-title { font-size: 1.625rem; }

  .section-title { font-size: 1.25rem; }

  .capability-card { padding: 28px 24px; }

  .capability-list--double { grid-template-columns: 1fr; }

  .logo-text { font-size: 1rem; }

  .product-features { gap: 12px; }

  .feature-item { font-size: 0.875rem; }
}

/* ===== 打印 ===== */
@media print {
  .site-header, .back-to-top, .scroll-indicator, .menu-toggle { display: none; }
  .hero { min-height: auto; }
  body { background: white; }
}