/* ==========================================================================
   龙猫云机场 (Totoro Cloud) - 原生极速样式表 (架构重构版)
   零外部依赖 / 秒开加载 / 纯原生 CSS / 全端响应式 / WCAG 无障碍适配
   ========================================================================== */

:root {
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-light: #eef2ff;
  --primary-glow: rgba(79, 70, 229, 0.25);
  --accent: #06b6d4;
  --accent-hover: #0891b2;
  --accent-gradient: linear-gradient(135deg, #4f46e5 0%, #06b6d4 100%);
  --accent-glow: rgba(6, 182, 212, 0.2);
  --bg-main: #070a13;
  --bg-card: #0f1629;
  --bg-card-hover: #162038;
  --bg-elevated: #1a2542;
  --bg-glass: rgba(15, 22, 41, 0.85);
  --text-main: #f9fafb;
  --text-muted: #94a3b8;
  --text-sub: #cbd5e1;
  --border-color: #1e293b;
  --border-light: rgba(255, 255, 255, 0.08);
  --border-focus: #6366f1;
  --success: #10b981;
  --warning: #f59e0b;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 6px 20px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 14px 40px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 35px rgba(79, 70, 229, 0.25);
  --container-max: 1240px;
  --header-height: 76px;
}

/* 基础重置与无障碍支持 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-main);
  background-color: var(--bg-main);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background-color: var(--bg-main);
  background-image: 
    radial-gradient(circle at 15% 10%, rgba(79, 70, 229, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 85% 35%, rgba(6, 182, 212, 0.06) 0%, transparent 45%),
    radial-gradient(circle at 50% 80%, rgba(79, 70, 229, 0.05) 0%, transparent 50%);
  background-attachment: fixed;
}

/* 键盘无障碍：跳转主要内容链接 */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  background: var(--primary);
  color: #ffffff;
  padding: 0.75rem 1.25rem;
  z-index: 9999;
  font-weight: 600;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 1rem;
  outline: 3px solid var(--accent);
}

/* 焦点样式规范 */
a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

/* 锚点滚动距离补偿 */
[id] {
  scroll-margin-top: calc(var(--header-height) + 2rem);
}

/* 容器规范 */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

/* ==========================================================================
   页眉 Header 与导航 (悬浮玻璃态重构)
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-height);
  background: rgba(7, 10, 19, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-main);
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.brand-logo svg {
  width: 34px;
  height: 34px;
  filter: drop-shadow(0 2px 8px rgba(79, 70, 229, 0.4));
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: rgba(255, 255, 255, 0.03);
  padding: 0.35rem 0.6rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-light);
}

.site-nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  padding: 0.45rem 0.9rem;
  border-radius: var(--radius-full);
  transition: all 0.2s ease;
  min-height: 40px;
  display: inline-flex;
  align-items: center;
}

.site-nav a:hover,
.site-nav a.active {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.08);
}

.nav-badge {
  background: var(--accent-gradient);
  color: #ffffff;
  font-size: 0.68rem;
  font-weight: 700;
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-full);
  margin-left: 0.4rem;
  letter-spacing: 0.04em;
}

.header-cta {
  display: inline-flex;
  align-items: center;
}

/* 按钮通用规范 (触控区域 >= 44x44px) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.98rem;
  font-weight: 600;
  padding: 0.75rem 1.6rem;
  min-height: 44px;
  min-width: 44px;
  border-radius: var(--radius-md);
  text-decoration: none;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  border: 1px solid transparent;
  line-height: 1.2;
}

.btn-primary {
  background: var(--accent-gradient);
  color: #ffffff;
  box-shadow: 0 4px 18px rgba(79, 70, 229, 0.45);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 26px rgba(79, 70, 229, 0.65);
  color: #ffffff;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
  border: 1px solid var(--border-light);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
  color: #ffffff;
}

.btn-sm {
  padding: 0.5rem 1.2rem;
  font-size: 0.88rem;
  min-height: 44px;
}

.btn-lg {
  padding: 1rem 2.2rem;
  font-size: 1.08rem;
  border-radius: var(--radius-lg);
}

/* ==========================================================================
   主视觉区 (Hero Section - 非对称双栏指挥台架构重构)
   ========================================================================== */
.hero-section {
  padding: 4.5rem 0 3.5rem;
  position: relative;
  overflow: hidden;
}

.hero-split-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 3.5rem;
  align-items: center;
}

.hero-narrative {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  text-align: left;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background: rgba(79, 70, 229, 0.12);
  border: 1px solid rgba(99, 102, 241, 0.35);
  color: #c7d2fe;
  padding: 0.45rem 1.1rem;
  border-radius: var(--radius-full);
  font-size: 0.86rem;
  font-weight: 600;
  margin-bottom: 1.75rem;
  box-shadow: 0 2px 12px rgba(79, 70, 229, 0.15);
}

.hero-title {
  font-size: clamp(2.2rem, 4.2vw, 3.4rem);
  font-weight: 850;
  line-height: 1.22;
  letter-spacing: -0.035em;
  margin-bottom: 1.4rem;
  color: #ffffff;
}

.hero-title .gradient-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.hero-subtitle {
  font-size: 1.08rem;
  color: var(--text-sub);
  line-height: 1.8;
  margin-bottom: 2.25rem;
  max-width: 620px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}

/* 右侧：专线性能监控指挥台 (Telemetry Cockpit) */
.hero-cockpit {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 2rem;
  position: relative;
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  backdrop-filter: blur(12px);
}

.hero-cockpit::before {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: var(--radius-xl);
  padding: 1px;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.4) 0%, rgba(6, 182, 212, 0.2) 100%);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

.cockpit-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 1.25rem;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.cockpit-title-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.live-beacon {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  background: var(--success);
  box-shadow: 0 0 10px var(--success);
}

.cockpit-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.15rem;
}

.cockpit-item {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-md);
  padding: 1.15rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.cockpit-item:hover {
  transform: translateX(4px);
  border-color: rgba(99, 102, 241, 0.35);
  background: rgba(255, 255, 255, 0.05);
}

.cockpit-icon {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  background: rgba(79, 70, 229, 0.15);
  border: 1px solid rgba(99, 102, 241, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #818cf8;
  flex-shrink: 0;
}

.cockpit-icon svg {
  width: 22px;
  height: 22px;
}

.cockpit-label {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
  line-height: 1.45;
}

/* ==========================================================================
   区块通用排版
   ========================================================================== */
.section {
  padding: 5rem 0;
  border-top: 1px solid var(--border-color);
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 3.75rem;
}

.section-tag {
  display: inline-block;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 0.6rem;
  padding: 0.25rem 0.8rem;
  background: rgba(6, 182, 212, 0.08);
  border-radius: var(--radius-full);
  border: 1px solid rgba(6, 182, 212, 0.2);
}

.section-title {
  font-size: clamp(1.85rem, 3.4vw, 2.5rem);
  font-weight: 800;
  color: #ffffff;
  letter-spacing: -0.025em;
  margin-bottom: 0.85rem;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ==========================================================================
   套餐价格对比表 (Pricing Matrix - 紧随首屏，高转化展示)
   ========================================================================== */
.pricing-notice-box {
  background: rgba(79, 70, 229, 0.08);
  border: 1px solid rgba(99, 102, 241, 0.25);
  border-radius: var(--radius-md);
  padding: 0.9rem 1.5rem;
  margin-bottom: 2rem;
  text-align: center;
}

.pricing-notice {
  font-size: 0.92rem;
  color: #c7d2fe;
}

.table-responsive {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  position: relative;
}

.pricing-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  min-width: 680px;
  text-align: left;
}

.pricing-table caption {
  padding: 1.25rem 1.75rem;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-sub);
  text-align: left;
  border-bottom: 1px solid var(--border-color);
  background: rgba(255, 255, 255, 0.02);
}

.pricing-table th,
.pricing-table td {
  padding: 1.35rem 1.75rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  vertical-align: middle;
}

.pricing-table th {
  background: rgba(255, 255, 255, 0.02);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.pricing-table tbody tr {
  transition: background-color 0.2s ease;
}

.pricing-table tbody tr:hover {
  background: rgba(255, 255, 255, 0.03);
}

.pricing-table tbody tr.featured-row {
  background: rgba(79, 70, 229, 0.09);
  position: relative;
}

.pricing-table tbody tr.featured-row td {
  border-color: rgba(99, 102, 241, 0.25);
}

.plan-name {
  font-size: 1.15rem;
  font-weight: 700;
  color: #ffffff;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.plan-badge {
  font-size: 0.72rem;
  font-weight: 700;
  background: var(--accent-gradient);
  color: #ffffff;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-full);
  letter-spacing: 0.03em;
}

.plan-price {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -0.02em;
}

.plan-price span {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* ==========================================================================
   产品核心优势 (Features - 非对称 Bento Grid 架构重构)
   ========================================================================== */
.features-bento-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

/* 核心旗舰卡片（左侧独立跨行呈现） */
.feature-card-master {
  background: linear-gradient(180deg, var(--bg-card) 0%, rgba(15, 22, 41, 0.6) 100%);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 2.75rem 2.25rem;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.feature-card-master:hover {
  transform: translateY(-4px);
  border-color: rgba(99, 102, 241, 0.45);
}

.feature-card-master::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 250px;
  height: 250px;
  background: radial-gradient(circle, rgba(79, 70, 229, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

/* 右侧堆叠卡片 */
.features-stack-column {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.feature-card-secondary {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 2.25rem 2rem;
  display: flex;
  flex-direction: column;
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.feature-card-secondary:hover {
  transform: translateY(-3px);
  border-color: rgba(6, 182, 212, 0.35);
}

.feature-icon-wrapper {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: rgba(79, 70, 229, 0.14);
  border: 1px solid rgba(99, 102, 241, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  color: #818cf8;
}

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

.feature-title {
  font-size: 1.35rem;
  font-weight: 750;
  color: #ffffff;
  margin-bottom: 0.85rem;
  letter-spacing: -0.02em;
}

.feature-text {
  color: var(--text-sub);
  font-size: 0.98rem;
  line-height: 1.75;
  margin-bottom: 1.75rem;
  flex-grow: 1;
}

.feature-specs {
  list-style: none;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.feature-specs li {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.feature-specs svg {
  width: 17px;
  height: 17px;
  color: var(--accent);
  flex-shrink: 0;
}

/* ==========================================================================
   流媒体与 AI 支持图卡 (Dual-Chamber 双舱沉浸式重构)
   ========================================================================== */
.support-chambers-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2.25rem;
}

.support-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 2.5rem;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.support-card:hover {
  transform: translateY(-4px);
  border-color: rgba(99, 102, 241, 0.4);
}

.support-card-badge {
  display: inline-block;
  font-size: 0.76rem;
  font-weight: 750;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  margin-bottom: 1.25rem;
  background: rgba(6, 182, 212, 0.12);
  color: #22d3ee;
  border: 1px solid rgba(6, 182, 212, 0.3);
}

.support-title {
  font-size: 1.45rem;
  font-weight: 800;
  color: #ffffff;
  letter-spacing: -0.02em;
  margin-bottom: 0.9rem;
}

.support-desc {
  color: var(--text-sub);
  font-size: 0.98rem;
  line-height: 1.7;
  margin-bottom: 2rem;
}

.support-tags {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}

.tag-item {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  padding: 0.65rem 0.9rem;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-main);
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.tag-item:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(99, 102, 241, 0.35);
}

/* ==========================================================================
   用户评价 (User Voices - 错落式证言甲板重构)
   ========================================================================== */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 2.25rem 2rem;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.testimonial-card:hover {
  transform: translateY(-4px);
  border-color: rgba(99, 102, 241, 0.35);
}

.testimonial-rating {
  color: #fbbf24;
  margin-bottom: 1.25rem;
  display: flex;
  gap: 0.25rem;
}

.testimonial-rating svg {
  width: 19px;
  height: 19px;
  fill: currentColor;
}

.testimonial-quote {
  color: var(--text-sub);
  font-size: 0.98rem;
  line-height: 1.75;
  margin-bottom: 1.75rem;
  flex-grow: 1;
  font-style: normal;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 1.25rem;
}

.author-avatar {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.1rem;
  color: #ffffff;
  box-shadow: 0 2px 10px rgba(79, 70, 229, 0.4);
}

.author-info h4 {
  font-size: 0.98rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 0.15rem;
}

.author-info p {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ==========================================================================
   常见问题解答 (FAQ - 双栏知识枢纽架构重构)
   ========================================================================== */
.faq-split-layout {
  display: grid;
  grid-template-columns: 0.9fr 1.3fr;
  gap: 4rem;
  align-items: flex-start;
}

.faq-sidebar {
  position: sticky;
  top: calc(var(--header-height) + 2rem);
  text-align: left;
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
  width: 100%;
}

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

.faq-item[open] {
  border-color: rgba(99, 102, 241, 0.45);
  background: rgba(15, 22, 41, 0.95);
}

.faq-question {
  padding: 1.35rem 1.65rem;
  font-size: 1.05rem;
  font-weight: 700;
  color: #ffffff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
  list-style: none;
  min-height: 44px;
  gap: 1rem;
  line-height: 1.45;
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-icon {
  width: 22px;
  height: 22px;
  color: var(--accent);
  transition: transform 0.25s ease;
  flex-shrink: 0;
}

.faq-item[open] .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 1.65rem 1.65rem;
  color: var(--text-sub);
  font-size: 0.96rem;
  line-height: 1.8;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 1.25rem;
}

.faq-answer a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.2s ease;
}

.faq-answer a:hover {
  color: #67e8f9;
}

/* ==========================================================================
   页脚 Footer (极简 4 标题独立页面导航)
   ========================================================================== */
.site-footer {
  background: #05070d;
  border-top: 1px solid var(--border-color);
  padding: 3.5rem 0 2.5rem;
  margin-top: auto;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
  text-align: center;
}

.footer-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  list-style: none;
  flex-wrap: wrap;
}

.footer-links li a {
  color: var(--text-sub);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 600;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-light);
  transition: all 0.2s ease;
}

.footer-links li a:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.2);
}

.footer-meta {
  color: var(--text-muted);
  font-size: 0.88rem;
  line-height: 1.65;
}

/* ==========================================================================
   内容单页与文章专用排版 (Knowledge / Article / Sub-pages 完整保留)
   ========================================================================== */
.page-header {
  padding: 3.5rem 0 2rem;
  background: radial-gradient(circle at 50% 10%, rgba(79, 70, 229, 0.12) 0%, rgba(7, 10, 19, 0) 70%);
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 2.5rem;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
  list-style: none;
}

.breadcrumb a {
  color: var(--text-sub);
  text-decoration: none;
}

.breadcrumb a:hover {
  color: #ffffff;
  text-decoration: underline;
}

.article-content {
  max-width: 820px;
  margin: 0 auto;
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-sub);
}

.article-content h1 {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 800;
  color: #ffffff;
  line-height: 1.3;
  margin-bottom: 1.25rem;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  color: var(--text-muted);
  font-size: 0.875rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.article-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: #ffffff;
  margin: 2.5rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid rgba(55, 65, 81, 0.5);
}

.article-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: #f3f4f6;
  margin: 1.75rem 0 0.75rem;
}

.article-content p {
  margin-bottom: 1.25rem;
}

.article-content ul,
.article-content ol {
  margin: 0 0 1.5rem 1.5rem;
}

.article-content li {
  margin-bottom: 0.5rem;
}

.article-content a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.article-content a:hover {
  color: #67e8f9;
}

.article-cta-box {
  background: var(--bg-card);
  border: 1px solid rgba(99, 102, 241, 0.4);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin: 3rem 0;
  text-align: center;
}

.article-cta-box h3 {
  color: #ffffff;
  margin-top: 0;
  margin-bottom: 0.5rem;
}

.article-cta-box p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 1.25rem;
}

/* 知识文章列表网格 */
.article-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.article-card:hover {
  transform: translateY(-3px);
  border-color: rgba(99, 102, 241, 0.5);
}

.article-card-tag {
  display: inline-block;
  align-self: flex-start;
  font-size: 0.75rem;
  font-weight: 700;
  color: #818cf8;
  background: rgba(79, 70, 229, 0.15);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  margin-bottom: 0.75rem;
}

.article-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 0.75rem;
  line-height: 1.4;
}

.article-card-title a {
  color: inherit;
  text-decoration: none;
}

.article-card-title a:hover {
  color: var(--accent);
}

.article-card-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.article-card-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
  border-top: 1px solid rgba(55, 65, 81, 0.4);
  padding-top: 0.75rem;
}

/* 网站地图列表卡片 */
.sitemap-section {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-bottom: 2rem;
}

.sitemap-section h2 {
  font-size: 1.35rem;
  color: #ffffff;
  margin-bottom: 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

.sitemap-links {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem 1.5rem;
}

.sitemap-links li a {
  color: var(--text-sub);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 44px;
  font-size: 0.95rem;
}

.sitemap-links li a:hover {
  color: var(--accent);
  text-decoration: underline;
}

/* ==========================================================================
   响应式媒体查询 (360px, 390px, 768px, 1024px, 1440px)
   ========================================================================== */
@media (max-width: 1100px) {
  .hero-split-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  
  .hero-narrative {
    align-items: center;
    text-align: center;
  }
  
  .hero-subtitle {
    margin-left: auto;
    margin-right: auto;
  }
  
  .hero-actions {
    justify-content: center;
  }

  .faq-split-layout {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .faq-sidebar {
    position: static;
    text-align: center;
  }
}

@media (max-width: 1024px) {
  .features-bento-grid,
  .support-chambers-grid,
  .testimonials-grid,
  .article-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: auto;
  }
  
  .site-header {
    padding: 0.85rem 0;
  }
  
  .header-inner {
    flex-wrap: wrap;
    gap: 0.85rem;
    justify-content: space-between;
  }
  
  .site-nav {
    order: 3;
    width: 100%;
    overflow-x: auto;
    white-space: nowrap;
    padding: 0.4rem 0.5rem;
    gap: 0.5rem;
    -webkit-overflow-scrolling: touch;
    border-radius: var(--radius-md);
  }
  
  .hero-section {
    padding: 3rem 0 2.5rem;
  }

  .hero-cockpit {
    padding: 1.5rem;
  }

  .features-bento-grid,
  .support-chambers-grid,
  .support-tags,
  .testimonials-grid,
  .article-grid,
  .sitemap-links {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .section {
    padding: 3.75rem 0;
  }

  .section-header {
    margin-bottom: 2.5rem;
  }
  
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  
  .hero-actions .btn {
    width: 100%;
  }

  .pricing-table th,
  .pricing-table td {
    padding: 1rem 1.15rem;
  }
  
  .footer-links {
    gap: 0.85rem;
    flex-direction: column;
    width: 100%;
  }

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

  .footer-links li a {
    width: 100%;
    justify-content: center;
  }
}

@media (max-width: 390px) {
  .container {
    padding-left: 1rem;
    padding-right: 1rem;
  }
  
  .brand-logo span {
    font-size: 1.15rem;
  }
  
  .btn-lg {
    padding: 0.85rem 1.5rem;
    font-size: 1rem;
  }

  .hero-title {
    font-size: 1.95rem;
  }
}

@media (max-width: 360px) {
  html {
    font-size: 15px;
  }
  
  .cockpit-item {
    padding: 0.9rem 1rem;
    gap: 0.75rem;
  }
  
  .cockpit-icon {
    width: 36px;
    height: 36px;
  }
}

/* 动效偏好无障碍支持 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}