/* ============================================================
   CV云官网 · 全新设计系统
   风格：清爽白底 · 蓝点色系 · 大厂质感
   ============================================================ */

/* ---------- CSS 变量 ---------- */
:root {
  --color-primary: #2563EB;
  --color-primary-dark: #1D4ED8;
  --color-primary-light: #DBEAFE;
  --color-primary-50: #EFF6FF;
  --color-primary-600: #4F46E5;

  --color-text: #0F172A;
  --color-text-secondary: #475569;
  --color-text-muted: #94A3B8;
  --color-text-on-dark: #F8FAFC;

  --color-bg: #FFFFFF;
  --color-bg-section: #EFF2F7;
  --color-bg-section-alt: #E8EDF3;
  --color-bg-dark: #0F172A;

  --color-border: #E2E8F0;
  --color-border-light: #F1F5F9;

  --shadow-sm: 0 1px 2px 0 rgba(0,0,0,0.04);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.05), 0 2px 4px -2px rgba(0,0,0,0.03);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.07), 0 4px 6px -4px rgba(0,0,0,0.03);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.08), 0 8px 10px -6px rgba(0,0,0,0.02);
  --shadow-glow: 0 0 40px rgba(37,99,235,0.08);

  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "Noto Sans SC", "PingFang SC",
    "Microsoft YaHei", sans-serif;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;

  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  --spacing-4xl: 5rem;

  --container-max: 1200px;
  --container-padding: 1.25rem;
  --navbar-height: 68px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;

  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
}

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

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

body {
  font-family: var(--font-family);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font-family: inherit; font-size: inherit; cursor: pointer; border: none; background: none; }

/* ---------- 通用工具类 ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-padding);
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
}

.section-header__title {
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.02em;
}

.section-header__subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  max-width: 520px;
  margin-inline: auto;
}

/* 按钮系统 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 0.625rem 1.5rem;
  font-size: var(--text-sm);
  font-weight: 500;
  line-height: 1.5;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn--primary {
  background-color: var(--color-primary);
  color: #fff;
  box-shadow: 0 1px 3px rgba(37,99,235,0.2);
}

.btn--primary:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(37,99,235,0.25);
}

.btn--outline {
  border: 1px solid rgba(255,255,255,0.5);
  color: #fff;
}

.btn--outline:hover {
  background-color: rgba(255,255,255,0.1);
}

.btn--outline-dark {
  border: 1px solid var(--color-border);
  color: var(--color-text);
  background: var(--color-bg);
}

.btn--outline-dark:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-50);
}

.btn--lg {
  padding: 0.75rem 1.75rem;
  font-size: var(--text-base);
  border-radius: var(--radius-lg);
}

/* ---------- 导航栏 ---------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--navbar-height);
  z-index: 1000;
  background-color: rgba(255,255,255,0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: all var(--transition-base);
}

.navbar--scrolled {
  background-color: rgba(255,255,255,0.95);
  border-bottom-color: var(--color-border-light);
  box-shadow: var(--shadow-sm);
}

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

.navbar__logo {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.navbar__logo-icon {
  width: 34px;
  height: 34px;
  background: var(--color-primary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
}

.navbar__menu {
  display: none;
  position: fixed;
  top: var(--navbar-height);
  left: 0;
  width: 100%;
  background-color: rgba(255,255,255,0.98);
  backdrop-filter: blur(8px);
  box-shadow: var(--shadow-lg);
  padding: var(--spacing-lg) var(--container-padding);
}

.navbar__menu--open { display: block; }

.navbar__link {
  display: block;
  padding: 0.75rem 0;
  color: var(--color-text);
  font-size: var(--text-base);
  font-weight: 500;
  transition: color var(--transition-fast);
}

.navbar__link:hover { color: var(--color-primary); }

.navbar__actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.navbar__login {
  color: var(--color-text);
  font-size: var(--text-sm);
  font-weight: 500;
  padding: 0.375rem 0.875rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.navbar__login:hover { color: var(--color-primary); }

.navbar__cta {
  background-color: var(--color-primary);
  color: #fff;
  font-size: var(--text-sm);
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.navbar__cta:hover {
  background-color: var(--color-primary-dark);
  box-shadow: 0 2px 8px rgba(37,99,235,0.25);
}

.navbar__hamburger {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
  cursor: pointer;
}

.navbar__hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition-base);
}

.navbar__hamburger--active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.navbar__hamburger--active span:nth-child(2) { opacity: 0; }
.navbar__hamburger--active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ---------- Hero ---------- */
.hero {
  padding-top: calc(var(--navbar-height) + var(--spacing-3xl));
  padding-bottom: var(--spacing-3xl);
  background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-section) 100%);
  overflow: hidden;
  position: relative;
}

.hero::before {
  content: "";
  position: absolute;
  top: -20%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(37,99,235,0.04) 0%, transparent 70%);
  pointer-events: none;
}

.hero__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: 0.375rem 0.875rem;
  background: var(--color-primary-50);
  border: 1px solid var(--color-primary-light);
  border-radius: 9999px;
  font-size: var(--text-sm);
  color: var(--color-primary);
  font-weight: 500;
  margin-bottom: var(--spacing-lg);
  width: fit-content;
}

.hero__badge-dot {
  width: 8px;
  height: 8px;
  background: var(--color-primary);
  border-radius: 50%;
  animation: pulse-dot 2s infinite;
}

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

.hero__title {
  font-size: var(--text-3xl);
  font-weight: 800;
  color: var(--color-text);
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.03em;
}

.hero__subtitle {
  font-size: var(--text-xl);
  color: var(--color-primary);
  font-weight: 600;
  margin-bottom: var(--spacing-md);
}

.hero__desc {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: 1.7;
  max-width: 480px;
  margin-bottom: var(--spacing-xl);
}

.hero__cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-2xl);
}

.hero__trust {
  display: flex;
  gap: var(--spacing-xl);
  flex-wrap: wrap;
}

.hero__trust-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.hero__trust-num {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
}

.hero__trust-label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* ---------- Dashboard Mockup ---------- */
.dashboard-mockup {
  background: #fff;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl), var(--shadow-glow);
  border: 1px solid var(--color-border);
  overflow: hidden;
  transform: perspective(1000px) rotateY(-3deg) rotateX(2deg);
  transition: transform var(--transition-slow);
}

.dashboard-mockup:hover {
  transform: perspective(1000px) rotateY(0deg) rotateX(0deg);
}

.dashboard-mockup__header {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: 0.75rem 1rem;
  background: #FAFBFC;
  border-bottom: 1px solid var(--color-border);
}

.dashboard-mockup__dots {
  display: flex;
  gap: 5px;
}

.dashboard-mockup__dots span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.dashboard-mockup__dots span:nth-child(1) { background: #FF5F57; }
.dashboard-mockup__dots span:nth-child(2) { background: #FFBD2E; }
.dashboard-mockup__dots span:nth-child(3) { background: #28CA42; }

.dashboard-mockup__nav {
  display: flex;
  gap: var(--spacing-md);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.dashboard-mockup__nav .active {
  color: var(--color-text);
  font-weight: 600;
}

.dashboard-mockup__body {
  display: grid;
  grid-template-columns: 140px 1fr;
  min-height: 320px;
}

.dashboard-mockup__sidebar {
  background: #F8FAFC;
  border-right: 1px solid var(--color-border);
  padding: var(--spacing-md);
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.sidebar-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: 0.5rem 0.625rem;
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.sidebar-item:hover, .sidebar-item.active {
  background: var(--color-primary);
  color: #fff;
}

.sidebar-icon {
  font-size: 10px;
  opacity: 0.7;
}

.dashboard-mockup__content {
  padding: var(--spacing-md);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

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

.stat-card {
  background: var(--color-bg-section);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
}

.stat-card__label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-bottom: 4px;
}

.stat-card__value {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
}

.stat-card__trend {
  font-size: var(--text-xs);
  font-weight: 600;
  margin-top: 2px;
}

.stat-card__trend.up { color: #16A34A; }
.stat-card__trend.down { color: #DC2626; }

.content-chart {
  background: var(--color-bg-section);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
}

.chart-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
}

.chart-legend {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.chart-legend .dot {
  width: 8px;
  height: 8px;
  border-radius: 2px;
  display: inline-block;
}

.chart-legend .dot.blue { background: var(--color-primary); }
.chart-legend .dot.orange { background: #F59E0B; }

.chart-area {
  height: 60px;
}

.chart-area svg {
  width: 100%;
  height: 100%;
}

.content-alerts {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.alert-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: 0.5rem 0.75rem;
  background: var(--color-bg-section);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
}

.alert-item--ok {
  background: #F0FDF4;
  color: #166534;
}

.alert-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #16A34A;
  flex-shrink: 0;
}

.alert-tag {
  margin-left: auto;
  padding: 1px 6px;
  background: var(--color-primary);
  color: #fff;
  border-radius: 9999px;
  font-size: 10px;
  font-weight: 600;
}

.alert-tag--auto {
  background: #7C3AED;
}

/* ---------- 信任数据条 ---------- */
.trust-bar {
  padding: var(--spacing-3xl) 0;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border-light);
}

.trust-bar__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
  text-align: center;
}

.trust-bar__divider { display: none; }

.trust-bar__item {
  padding: var(--spacing-md);
}

.trust-bar__number, .trust-bar__unit {
  display: inline;
  font-size: var(--text-3xl);
  font-weight: 800;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.trust-bar__number {
  background: linear-gradient(135deg, var(--color-text) 0%, var(--color-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.trust-bar__label {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-top: var(--spacing-xs);
}

/* ---------- Logo 墙 ---------- */
.logo-wall {
  padding: var(--spacing-2xl) 0;
  background: var(--color-bg);
}

.logo-wall__title {
  text-align: center;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-xl);
}

.logo-wall__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-md);
}

.logo-item {
  display: flex;
  justify-content: center;
}

.logo-item__box {
  width: 100%;
  max-width: 160px;
  height: 56px;
  background: var(--bg, #F8FAFC);
  color: var(--color, var(--color-text));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-sm);
  font-weight: 600;
  opacity: 0.7;
  transition: all var(--transition-base);
  border: 1px solid var(--color-border-light);
}

.logo-item__box:hover {
  opacity: 1;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* ---------- 产品能力区 ---------- */
.products {
  padding: var(--spacing-4xl) 0;
  background: linear-gradient(180deg, #F0F4F8 0%, #E8EDF3 100%);
}

.product-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
}

.product-card {
  background: #fff;
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
  padding: var(--spacing-xl);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.product-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-600));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

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

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

.product-card__icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-600));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  margin-bottom: var(--spacing-md);
  transition: all var(--transition-base);
}

.product-card:hover .product-card__icon {
  transform: scale(1.05);
  box-shadow: 0 4px 12px rgba(37,99,235,0.25);
}

.product-card__title {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
}

.product-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: var(--spacing-md);
}

.product-card__tags span {
  padding: 2px 8px;
  background: var(--color-primary-50);
  color: var(--color-primary);
  border-radius: 9999px;
  font-size: 11px;
  font-weight: 500;
}

.product-card__desc {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ---------- AI 能力区 ---------- */
.ai-section {
  padding: var(--spacing-4xl) 0;
  background: #FFFFFF;
}

.ai-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
}

.ai-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  transition: all var(--transition-base);
}

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

.ai-card__icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-md);
  color: #fff;
}

.ai-card__icon--blue { background: linear-gradient(135deg, #2563EB, #4F46E5); }
.ai-card__icon--purple { background: linear-gradient(135deg, #7C3AED, #A855F7); }
.ai-card__icon--green { background: linear-gradient(135deg, #16A34A, #22C55E); }
.ai-card__icon--orange { background: linear-gradient(135deg, #EA580C, #F59E0B); }

.ai-card__title {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
}

.ai-card__desc {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ---------- 客户案例 ---------- */
.cases {
  padding: var(--spacing-4xl) 0;
  background: #E2E8F0;
}

.cases-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
}

.case-card {
  background: var(--color-bg);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
}

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

.case-card__header {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.case-card__logo {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-lg);
  background: var(--bg, #F8FAFC);
  color: var(--color, var(--color-text));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-sm);
  font-weight: 700;
  flex-shrink: 0;
}

.case-card__name {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text);
}

.case-card__tag {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: 2px;
}

.case-card__quote {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--spacing-lg);
  padding-left: var(--spacing-md);
  border-left: 3px solid var(--color-primary-light);
}

.case-card__stats {
  display: flex;
  gap: var(--spacing-xl);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-border-light);
}

.case-stat__num {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-primary);
}

.case-stat__lab {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: 2px;
}

/* ---------- 对比区 ---------- */
.compare {
  padding: var(--spacing-4xl) 0;
  background: #FFFFFF;
}

.compare__timeline {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  max-width: 800px;
  margin: 0 auto;
}

.compare__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  background: var(--color-bg-section);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
}

.compare__arrow {
  display: none;
}

.compare__before, .compare__after {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.compare__before p, .compare__after p {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.compare__after p {
  color: var(--color-text);
  font-weight: 500;
}

.compare__badge {
  display: inline-block;
  padding: 2px 10px;
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  font-weight: 600;
  width: fit-content;
}

.compare__badge--before {
  background: #F1F5F9;
  color: var(--color-text-muted);
}

.compare__badge--after {
  background: var(--color-primary-50);
  color: var(--color-primary);
}

.compare__arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
}

/* ---------- 安全合规 ---------- */
.security {
  padding: var(--spacing-4xl) 0;
  background: #E2E8F0;
}

.security-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-lg);
}

.security-item {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  text-align: center;
  transition: all var(--transition-base);
}

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

.security-item__icon {
  font-size: var(--text-3xl);
  margin-bottom: var(--spacing-sm);
}

.security-item__name {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 4px;
}

.security-item__desc {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* ---------- CTA ---------- */
.cta-bottom {
  padding: var(--spacing-4xl) 0;
  background: linear-gradient(135deg, #0F172A 0%, #1E293B 100%);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-bottom::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -20%;
  width: 60%;
  height: 200%;
  background: radial-gradient(ellipse, rgba(37,99,235,0.08) 0%, transparent 70%);
  pointer-events: none;
}

.cta-bottom__title {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: #fff;
  margin-bottom: var(--spacing-sm);
  position: relative;
}

.cta-bottom__subtitle {
  font-size: var(--text-base);
  color: #94A3B8;
  margin-bottom: var(--spacing-xl);
  position: relative;
}

.cta-bottom__buttons {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  align-items: center;
  margin-bottom: var(--spacing-xl);
  position: relative;
}

.cta-bottom__phone {
  font-size: var(--text-sm);
  color: #64748B;
  position: relative;
}

.cta-bottom__phone a {
  color: #60A5FA;
  font-weight: 500;
}

/* ---------- Footer ---------- */
.footer {
  background-color: var(--color-bg-dark);
  color: #94A3B8;
  padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-2xl);
}

.footer__col-title {
  font-size: var(--text-sm);
  font-weight: 600;
  color: #E2E8F0;
  margin-bottom: var(--spacing-md);
}

.footer__link {
  display: block;
  font-size: var(--text-sm);
  color: #94A3B8;
  padding: 0.25rem 0;
  transition: color var(--transition-fast);
}

.footer__link:hover { color: #fff; }

.footer__contact {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.footer__phone {
  font-size: var(--text-lg);
  color: #fff;
  font-weight: 600;
}

.footer__phone-label {
  font-size: var(--text-xs);
  color: #64748B;
  margin-bottom: var(--spacing-xs);
}

.footer__qr {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
}

.footer__qr-img {
  width: 100px;
  height: 100px;
  background: #1E293B;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-xs);
  color: #64748B;
  border: 1px solid #334155;
  object-fit: cover;
}

.footer__qr-text {
  font-size: var(--text-xs);
  color: #64748B;
  line-height: 1.5;
}

.footer__bottom {
  border-top: 1px solid #1E293B;
  padding-top: var(--spacing-xl);
  text-align: center;
  font-size: var(--text-xs);
  color: #475569;
}

/* ---------- 悬浮工具栏 ---------- */
.float-bar {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 900;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.float-bar__btn {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-fast);
  position: relative;
  cursor: pointer;
}

.float-bar__btn--phone { background-color: var(--color-primary); color: #fff; }
.float-bar__btn--phone:hover { background-color: var(--color-primary-dark); transform: scale(1.05); }
.float-bar__btn--wechat { background-color: #07C160; color: #fff; }
.float-bar__btn--wechat:hover { background-color: #06AD56; transform: scale(1.05); }
.float-bar__btn--top { background-color: #fff; color: var(--color-text-secondary); border: 1px solid var(--color-border); }
.float-bar__btn--top:hover { color: var(--color-primary); border-color: var(--color-primary); transform: scale(1.05); }

.float-bar__popup {
  position: absolute;
  bottom: 56px;
  right: 0;
  width: 200px;
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  padding: var(--spacing-lg);
  text-align: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: all var(--transition-base);
}

.float-bar__popup--visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.float-bar__popup-title {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
}

.float-bar__popup-text {
  font-size: var(--text-sm);
  color: var(--color-primary);
  font-weight: 500;
}

.float-bar__popup-text a { color: inherit; }

.float-bar__popup-qr {
  width: 120px;
  height: 120px;
  margin: var(--spacing-sm) auto 0;
  background: var(--color-bg-section);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  overflow: hidden;
}

.float-bar__popup-qr img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 动画 ---------- */
.fade-in {
  opacity: 1;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in--visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 响应式 - 平板 (≥768px) ---------- */
@media (min-width: 768px) {
  :root {
    --container-padding: 2rem;
  }

  .navbar__hamburger { display: none; }

  .navbar__menu {
    display: flex !important;
    position: static;
    width: auto;
    background: none;
    box-shadow: none;
    padding: 0;
    gap: var(--spacing-xl);
    align-items: center;
  }

  .navbar__link {
    padding: 0;
    font-size: var(--text-sm);
    color: var(--color-text);
  }

  .hero__title { font-size: var(--text-4xl); }

  .hero__inner {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
  }

  .trust-bar__inner {
    grid-template-columns: repeat(4, 1fr);
    align-items: center;
  }

  .trust-bar__divider {
    display: block;
    width: 1px;
    height: 40px;
    background: var(--color-border);
  }

  .logo-wall__grid { grid-template-columns: repeat(4, 1fr); }

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

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

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

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

  .cta-bottom__buttons { flex-direction: row; justify-content: center; }

  .footer__grid { grid-template-columns: repeat(4, 1fr); }

  .compare__row {
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    padding: var(--spacing-xl) var(--spacing-2xl);
  }

  .compare__arrow { display: flex; }
}

/* ---------- 响应式 - 桌面 (≥1024px) ---------- */
@media (min-width: 1024px) {
  .hero__title { font-size: var(--text-5xl); }

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

  .ai-grid { grid-template-columns: repeat(4, 1fr); }

  .security-grid { grid-template-columns: repeat(6, 1fr); }

  .section-header__title { font-size: 2.5rem; }
}