/* ==========================================================================
   MESL 官方网站落地页全局主样式 (MESL Cloud Global Landing Page CSS)
   域名: mesljc.sbs | 品牌: MESL
   ========================================================================== */

:root {
  --bg-dark: #070b14;
  --bg-card: rgba(13, 22, 41, 0.75);
  --bg-card-hover: rgba(20, 34, 62, 0.85);
  --primary-cyan: #00f2fe;
  --primary-sky: #38bdf8;
  --primary-blue: #2563eb;
  --accent-glow: rgba(0, 242, 254, 0.25);
  --text-main: #f8fafc;
  --text-sub: #cbd5e1;
  --text-muted: #94a3b8;
  --border-subtle: rgba(56, 189, 248, 0.18);
  --border-focus: rgba(0, 242, 254, 0.5);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
  --font-mono: 'JetBrains Mono', Consolas, "SF Mono", monospace;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-full: 9999px;
  --nav-height: 72px;
  --container-max: 1200px;
}

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

html {
  scroll-behavior: smooth;
  font-family: var(--font-sans);
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  overflow-x: hidden;
  background: 
    radial-gradient(circle at 15% 15%, rgba(0, 242, 254, 0.05) 0%, transparent 40%),
    radial-gradient(circle at 85% 60%, rgba(37, 99, 235, 0.06) 0%, transparent 45%),
    #070b14;
  min-height: 100vh;
}

/* 锚点偏移修正 */
[id] {
  scroll-margin-top: calc(var(--nav-height) + 24px);
}

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

/* 页面网格背景装饰 */
.cyber-grid-overlay {
  position: fixed;
  inset: 0;
  background-image: 
    linear-gradient(to right, rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 50px 50px;
  pointer-events: none;
  z-index: 0;
}

/* 按钮通用组件 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 700;
  padding: 12px 28px;
  border-radius: var(--radius-full);
  text-decoration: none;
  cursor: pointer;
  transition: all 0.28s cubic-bezier(0.16, 1, 0.3, 1);
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(90deg, #00e5ff 0%, #00b4d8 50%, #2563eb 100%);
  color: #040814;
  font-weight: 800;
  box-shadow: 0 0 22px rgba(0, 229, 255, 0.45), 0 4px 16px rgba(37, 99, 235, 0.3);
  letter-spacing: 0.5px;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(0, 229, 255, 0.65), 0 6px 22px rgba(37, 99, 235, 0.45);
  color: #000000;
}

.btn-secondary {
  background: rgba(15, 23, 42, 0.8);
  border-color: rgba(56, 189, 248, 0.35);
  color: #e2e8f0;
}

.btn-secondary:hover {
  background: rgba(30, 41, 59, 0.9);
  border-color: var(--primary-cyan);
  color: #ffffff;
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  border-color: rgba(56, 189, 248, 0.4);
  color: #38bdf8;
}

.btn-outline:hover {
  background: rgba(56, 189, 248, 0.1);
  border-color: var(--primary-cyan);
}

/* ==========================================================================
   顶部固定导航栏 (Fixed Header)
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 1000;
  transition: background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
  background: rgba(7, 11, 20, 0.7);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(56, 189, 248, 0.12);
}

.site-header.scrolled {
  background: rgba(6, 10, 18, 0.92);
  border-bottom-color: rgba(0, 242, 254, 0.22);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

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

.brand-link {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.brand-logo-img {
  height: 42px;
  width: auto;
  display: block;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  color: var(--text-sub);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s ease;
  position: relative;
  padding: 6px 0;
}

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

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-cyan);
  transition: width 0.25s ease;
}

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

.header-cta-btn {
  padding: 9px 22px;
  font-size: 14px;
}

/* 汉堡菜单按钮 (手机端) */
.mobile-toggle-btn {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--text-main);
  z-index: 1001;
}

.mobile-toggle-btn svg {
  width: 26px;
  height: 26px;
  stroke: var(--text-main);
}

/* 移动端菜单抽屉 */
.mobile-nav-drawer {
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  background: rgba(7, 11, 20, 0.98);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transform: translateY(-120%);
  opacity: 0;
  pointer-events: none;
  transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s ease;
  z-index: 999;
}

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

.mobile-nav-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.mobile-nav-links a {
  display: block;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-sub);
  text-decoration: none;
  padding: 10px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.mobile-nav-links a:hover {
  color: var(--primary-cyan);
}

/* ==========================================================================
   首屏 Hero 区域 (Hero Section with Framework 44 Radar)
   ========================================================================== */
.hero-section {
  position: relative;
  min-height: 92vh;
  padding-top: calc(var(--nav-height) + 50px);
  padding-bottom: 70px;
  display: flex;
  align-items: center;
  z-index: 1;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  align-items: center;
  gap: 48px;
}

.hero-content {
  position: relative;
  z-index: 2;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(0, 242, 254, 0.1);
  border: 1px solid rgba(0, 242, 254, 0.3);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 700;
  color: var(--primary-cyan);
  margin-bottom: 24px;
}

.hero-eyebrow-dot {
  width: 8px;
  height: 8px;
  background: #10b981;
  border-radius: 50%;
  box-shadow: 0 0 10px #10b981;
}

.hero-title {
  font-size: clamp(34px, 4.5vw, 56px);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
}

.hero-title .brand-accent {
  background: linear-gradient(135deg, #00f2fe 0%, #38bdf8 50%, #2563eb 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.hero-desc {
  font-size: clamp(16px, 1.2vw, 18px);
  color: var(--text-sub);
  line-height: 1.7;
  margin-bottom: 34px;
  max-width: 580px;
}

.hero-btn-group {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.hero-badges-row {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  padding-top: 24px;
  border-top: 1px solid rgba(56, 189, 248, 0.14);
}

.hero-badge-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
}

.hero-badge-item strong {
  color: var(--text-main);
  font-family: var(--font-mono);
}

/* ==========================================================================
   通用区块标题与卡片
   ========================================================================== */
.section-wrapper {
  position: relative;
  padding: 85px 0;
  z-index: 1;
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 55px;
}

.section-kicker {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--primary-sky);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(26px, 3.2vw, 40px);
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 16px;
  color: #ffffff;
}

.section-desc {
  font-size: 16px;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ==========================================================================
   核心专线优势 (BGP + IEPL + IPLC Features)
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 28px;
}

.feature-box {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 34px 28px;
  backdrop-filter: blur(12px);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
}

.feature-box:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-focus);
  transform: translateY(-4px);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.45);
}

.feature-icon-wrapper {
  width: 54px;
  height: 54px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(0, 242, 254, 0.12), rgba(37, 99, 235, 0.2));
  border: 1px solid rgba(0, 242, 254, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  font-size: 24px;
  color: var(--primary-cyan);
}

.feature-box h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
  color: #ffffff;
}

.feature-box p {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.7;
}

.feature-tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px dashed rgba(51, 65, 85, 0.4);
}

.feature-pill {
  font-size: 11px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  background: rgba(30, 41, 59, 0.7);
  color: #38bdf8;
  border: 1px solid rgba(56, 189, 248, 0.2);
}

/* ==========================================================================
   套餐价格展示 (Pricing Section with Period Switcher)
   ========================================================================== */
.pricing-section {
  background: radial-gradient(ellipse at 50% 50%, rgba(37, 99, 235, 0.08) 0%, transparent 70%);
}

.billing-switch-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 45px;
}

.billing-switcher {
  background: rgba(15, 23, 42, 0.85);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  padding: 4px;
  display: inline-flex;
  gap: 4px;
}

.billing-opt {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 600;
  padding: 8px 20px;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all 0.25s ease;
}

.billing-opt.active {
  background: linear-gradient(135deg, #00f2fe, #2563eb);
  color: #050b14;
  font-weight: 800;
  box-shadow: 0 2px 10px rgba(0, 242, 254, 0.3);
}

.discount-badge {
  background: #ef4444;
  color: #ffffff;
  font-size: 10px;
  font-weight: 800;
  padding: 2px 6px;
  border-radius: 4px;
  margin-left: 4px;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  backdrop-filter: blur(12px);
  position: relative;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.pricing-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-focus);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.5);
}

.pricing-card.is-popular {
  border-color: rgba(0, 242, 254, 0.55);
  background: rgba(18, 30, 56, 0.85);
  box-shadow: 0 10px 30px rgba(0, 242, 254, 0.15);
}

.popular-ribbon {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(90deg, #00f2fe, #2563eb);
  color: #050b14;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 1px;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  text-transform: uppercase;
}

.pricing-plan-name {
  font-size: 20px;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 6px;
}

.pricing-plan-desc {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.pricing-price-box {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid rgba(51, 65, 85, 0.4);
}

.price-currency {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary-cyan);
}

.price-amount {
  font-size: 42px;
  font-weight: 900;
  font-family: var(--font-mono);
  color: #ffffff;
  line-height: 1;
}

.price-period {
  font-size: 13px;
  color: var(--text-muted);
}

.plan-features-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 28px;
}

.plan-features-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text-sub);
}

.plan-features-list li svg {
  width: 16px;
  height: 16px;
  stroke: #10b981;
  flex-shrink: 0;
}

.btn-plan-cta {
  width: 100%;
}

/* ==========================================================================
   客户端与教程时间线 (Client & Setup Timeline)
   ========================================================================== */
.timeline-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  margin-bottom: 45px;
}

.timeline-step-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 26px 20px;
  position: relative;
  transition: all 0.28s ease;
}

.timeline-step-card:hover {
  border-color: var(--primary-sky);
  transform: translateY(-3px);
}

.step-number {
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 900;
  color: rgba(56, 189, 248, 0.35);
  margin-bottom: 10px;
}

.step-title {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 8px;
  color: #ffffff;
}

.step-desc {
  font-size: 13px;
  color: var(--text-sub);
  line-height: 1.6;
}

.clients-badges-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 16px;
}

.client-badge-card {
  background: rgba(15, 23, 42, 0.65);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px;
  text-align: center;
  transition: all 0.25s ease;
}

.client-badge-card:hover {
  background: rgba(30, 41, 59, 0.85);
  border-color: var(--primary-cyan);
}

.client-icon {
  font-size: 26px;
  margin-bottom: 8px;
}

.client-name {
  font-size: 14px;
  font-weight: 700;
  color: #ffffff;
}

.client-platform {
  font-size: 11px;
  color: var(--text-muted);
}

/* ==========================================================================
   知识库文章区域 (Original Articles Grid)
   ========================================================================== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 26px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  text-decoration: none;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.article-card:hover {
  border-color: var(--border-focus);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.4);
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.article-badge {
  background: rgba(0, 242, 254, 0.1);
  color: #38bdf8;
  padding: 3px 9px;
  border-radius: 4px;
  font-weight: 600;
}

.article-title {
  font-size: 18px;
  font-weight: 700;
  line-height: 1.45;
  color: #ffffff;
  margin-bottom: 12px;
  transition: color 0.2s ease;
}

.article-card:hover .article-title {
  color: var(--primary-cyan);
}

.article-summary {
  font-size: 13px;
  color: var(--text-sub);
  line-height: 1.6;
  margin-bottom: 20px;
}

.article-footer-cta {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 700;
  color: var(--primary-cyan);
}

/* ==========================================================================
   用户真实体验评价 - 垂直无缝滚动专区 (User Testimonials - Vertical Marquee)
   ========================================================================== */
.testimonials-section {
  position: relative;
  overflow: hidden;
}

/* 垂直双轨滚动容器 (上下滚动，不要左右) */
.v-marquee-container {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
  max-width: 960px;
  margin: 0 auto;
  height: 500px;
  overflow: hidden;
  position: relative;
  padding: 10px 4px;
  -webkit-mask-image: linear-gradient(to bottom, transparent 0%, black 14%, black 86%, transparent 100%);
  mask-image: linear-gradient(to bottom, transparent 0%, black 14%, black 86%, transparent 100%);
}

.v-marquee-container:hover .v-marquee-track {
  animation-play-state: paused;
}

.v-marquee-track {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* 向上平滑滚动 */
.v-marquee-track.track-up {
  animation: vMarqueeScrollUp 32s linear infinite;
}

/* 向下平滑滚动 / 交错滚动 */
.v-marquee-track.track-down {
  animation: vMarqueeScrollDown 36s linear infinite;
}

@keyframes vMarqueeScrollUp {
  0% {
    transform: translateY(0);
  }
  100% {
    transform: translateY(-50%);
  }
}

@keyframes vMarqueeScrollDown {
  0% {
    transform: translateY(-50%);
  }
  100% {
    transform: translateY(0);
  }
}

/* 评价卡片样式 (完全匹配图二) */
.v-marquee-card {
  background: rgba(13, 21, 38, 0.78);
  border: 1px solid rgba(56, 189, 248, 0.18);
  border-radius: 14px;
  padding: 22px;
  backdrop-filter: blur(14px);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.4);
  transition: all 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

.v-marquee-card:hover {
  border-color: rgba(0, 242, 254, 0.5);
  background: rgba(18, 30, 56, 0.9);
  transform: translateY(-3px);
  box-shadow: 0 16px 36px rgba(0, 242, 254, 0.12), 0 10px 24px rgba(0, 0, 0, 0.6);
}

.feedback-user-info {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.feedback-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 15px;
  flex-shrink: 0;
  box-shadow: 0 0 12px rgba(0, 242, 254, 0.25);
}

.avatar-cyan {
  background: linear-gradient(135deg, #00f2fe, #0284c7);
  color: #020617;
}

.avatar-blue {
  background: linear-gradient(135deg, #38bdf8, #2563eb);
  color: #ffffff;
}

.avatar-purple {
  background: linear-gradient(135deg, #a855f7, #6366f1);
  color: #ffffff;
}

.avatar-emerald {
  background: linear-gradient(135deg, #10b981, #0284c7);
  color: #ffffff;
}

.feedback-user-name {
  font-size: 15px;
  font-weight: 700;
  color: #ffffff;
}

.feedback-user-tag {
  font-size: 12px;
  color: #94a3b8;
  margin-top: 2px;
}

.feedback-content-text {
  font-size: 13.5px;
  color: #cbd5e1;
  line-height: 1.7;
}

/* 底部提交评价按钮行 */
.feedback-action-row {
  text-align: center;
  margin-top: 36px;
}

/* 评价提交弹窗 Modal */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.78);
  backdrop-filter: blur(8px);
  z-index: 2000;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal-overlay.is-active {
  display: flex;
}

.modal-dialog {
  background: #0c1527;
  border: 1px solid rgba(0, 242, 254, 0.35);
  border-radius: 18px;
  padding: 32px 28px;
  max-width: 480px;
  width: 100%;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.85);
  position: relative;
  animation: modalFadeIn 0.25s ease;
}

@keyframes modalFadeIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.modal-close-btn {
  position: absolute;
  top: 16px;
  right: 18px;
  background: none;
  border: none;
  color: #94a3b8;
  font-size: 26px;
  cursor: pointer;
  line-height: 1;
  transition: color 0.2s ease;
}

.modal-close-btn:hover {
  color: #ffffff;
}

.modal-title {
  font-size: 20px;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 8px;
}

.modal-desc {
  font-size: 13px;
  color: #94a3b8;
  margin-bottom: 20px;
  line-height: 1.6;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 16px;
}

.form-group label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-sub);
}

.form-control {
  background: rgba(10, 16, 28, 0.8);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  color: #ffffff;
  font-family: inherit;
  font-size: 14px;
  transition: border-color 0.25s ease;
}

.form-control:focus {
  outline: none;
  border-color: var(--primary-cyan);
  box-shadow: 0 0 10px rgba(0, 242, 254, 0.2);
}

textarea.form-control {
  resize: vertical;
  min-height: 90px;
}

/* ==========================================================================
   常见问题 FAQ 手风琴 (FAQ Accordion)
   ========================================================================== */
.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.25s ease;
}

.faq-item.active {
  border-color: var(--border-focus);
}

.faq-question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 24px;
  background: transparent;
  border: none;
  color: #ffffff;
  font-size: 16px;
  font-weight: 700;
  text-align: left;
  cursor: pointer;
}

.faq-toggle-icon {
  width: 20px;
  height: 20px;
  stroke: var(--primary-cyan);
  transition: transform 0.3s ease;
  flex-shrink: 0;
  margin-left: 16px;
}

.faq-item.active .faq-toggle-icon {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0.16, 1, 0.3, 1), padding 0.3s ease;
  padding: 0 24px;
  color: var(--text-sub);
  font-size: 14px;
  line-height: 1.75;
}

.faq-item.active .faq-answer {
  max-height: 400px;
  padding: 0 24px 22px;
}

/* ==========================================================================
   页脚 (Semantic Footer)
   ========================================================================== */
.site-footer {
  background: #04070d;
  border-top: 1px solid rgba(56, 189, 248, 0.14);
  padding: 60px 0 30px;
  position: relative;
  z-index: 2;
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 50px;
}

.footer-brand-info p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
  margin: 16px 0 20px;
  max-width: 360px;
}

.footer-col h4 {
  font-size: 15px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 16px;
}

.footer-links-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links-list a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 13px;
  transition: color 0.2s ease;
}

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

.footer-bottom-bar {
  padding-top: 25px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
  font-size: 12px;
  color: #64748b;
}

/* 滚动平滑淡入动效 */
.reveal-on-scroll {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.65s cubic-bezier(0.16, 1, 0.3, 1), transform 0.65s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ==========================================================================
   移动端与多分辨率断点响应式适配 (320px - 1440px)
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 40px;
  }
  .hero-content {
    margin: 0 auto;
  }
  .hero-desc {
    margin-left: auto;
    margin-right: auto;
  }
  .hero-btn-group,
  .hero-badges-row {
    justify-content: center;
  }
  .footer-top-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .v-marquee-container {
    grid-template-columns: 1fr;
    height: 440px;
  }
  .v-marquee-track.track-down {
    display: none;
  }
  .nav-links,
  .site-header .header-cta-btn {
    display: none;
  }
  .mobile-toggle-btn {
    display: block;
  }
  .section-wrapper {
    padding: 60px 0;
  }
  .footer-top-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }
  .hero-btn-group {
    flex-direction: column;
    width: 100%;
  }
  .hero-btn-group .btn {
    width: 100%;
  }
  .billing-switcher {
    width: 100%;
    justify-content: center;
  }
  .billing-opt {
    padding: 6px 12px;
    font-size: 12px;
  }
  .price-amount {
    font-size: 36px;
  }
}

/* 减弱动画模式支持 */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .v-marquee-track {
    animation: none !important;
    transform: none !important;
  }
  .reveal-on-scroll {
    opacity: 1 !important;
    transform: none !important;
  }
}