/* ==========================================================================
   智联网络 (zlwl.homes) 官方落地页主样式表
   设计规范：极简苹果白（商务、稳定、清爽）+ 黑色单线框线体系
   背景：浅灰 (#f5f5f7) | 框架：1px 黑色单线条 (#111111)
   ========================================================================== */

:root {
  --bg-main: #f5f5f7;
  --bg-card: #ffffff;
  --bg-card-subtle: #fafafc;
  --bg-accent: #f0f0f4;
  --border-line: #111111;
  --border-subtle: rgba(17, 17, 17, 0.15);
  
  --text-primary: #111111;
  --text-secondary: #55555e;
  --text-muted: #86868b;
  
  --apple-blue: #0071e3;
  --apple-blue-hover: #0077ed;
  --tech-cyan: #0088cc;
  --tech-green: #28a745;
  --tech-badge-bg: #eef3f8;
  
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-full: 9999px;
  
  --shadow-flat: none;
  --shadow-subtle: none;
  --shadow-hover: none;
  
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", Menlo, Monaco, Consolas, "JetBrains Mono", monospace;
  
  --container-max: 1240px;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--text-primary);
  line-height: 1.65;
  overflow-x: hidden;
  min-height: 100vh;
}

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

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
}

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

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

/* 黑色单线统一类 (Black Single-Line Wireframe) - 无阴影纯单线 */
.black-frame {
  border: 1px solid var(--border-line);
  background-color: var(--bg-card);
  box-shadow: none;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.black-frame:hover {
  transform: none;
  box-shadow: none;
}

.black-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  border: 1px solid var(--border-line);
  border-radius: var(--radius-full);
  background: #ffffff;
}

/* 顶栏导航 (Navbar) */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(245, 245, 247, 0.94);
  backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border-line);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-icon {
  width: 38px;
  height: 38px;
  border-radius: 8px;
  border: 1px solid var(--border-line);
  object-fit: contain;
  background: #ffffff;
}

.brand-info {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  line-height: 1.2;
}

.brand-domain {
  font-size: 0.72rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

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

.nav-links a {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  position: relative;
  padding: 4px 0;
}

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

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 1.5px;
  background-color: var(--border-line);
  transition: width var(--transition-fast);
}

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

.nav-cta {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  font-size: 0.92rem;
  padding: 10px 22px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-line);
  transition: all var(--transition-fast);
  text-decoration: none;
}

.btn-primary {
  background-color: var(--border-line);
  color: #ffffff;
  box-shadow: none;
}

.btn-primary:hover {
  background-color: #2b2b2b;
  transform: none;
  box-shadow: none;
}

.btn-secondary {
  background-color: #ffffff;
  color: var(--text-primary);
  box-shadow: none;
}

.btn-secondary:hover {
  background-color: #f8f8fa;
  transform: none;
  box-shadow: none;
}

.btn-sm {
  padding: 6px 14px;
  font-size: 0.82rem;
}

/* 指令3: H1 品牌首屏 (Hero Section) */
.hero-section {
  padding: 72px 0 60px;
  text-align: center;
  position: relative;
}

.hero-pill {
  margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(2rem, 4.2vw, 3.4rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  color: var(--text-primary);
  max-width: 980px;
  margin: 0 auto 20px;
}

.hero-title .brand-highlight {
  display: inline-block;
  padding: 2px 12px;
  border: 1px solid var(--border-line);
  background: #ffffff;
  box-shadow: none;
  border-radius: var(--radius-sm);
  margin-right: 8px;
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 820px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.hero-actions .btn {
  padding: 14px 32px;
  font-size: 1.05rem;
}

.hero-stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  max-width: 1040px;
  margin: 0 auto;
}

.stat-card {
  padding: 22px 18px;
  border-radius: var(--radius-md);
  text-align: left;
  position: relative;
}

.stat-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 6px;
}

.stat-value {
  font-size: 1.8rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--text-primary);
  line-height: 1.1;
  margin-bottom: 6px;
}

.stat-detail {
  font-size: 0.78rem;
  color: var(--text-secondary);
}

/* 指令4: H2 套餐动态并排横向滑动 (Pricing Horizontal Slider) */
.section-pricing {
  padding: 80px 0;
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 40px;
}

.section-h2 {
  font-size: clamp(1.75rem, 3.2vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.section-sub {
  font-size: 1.05rem;
  color: var(--text-secondary);
}

.pricing-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1080px;
  margin: 0 auto 28px;
  flex-wrap: wrap;
  gap: 16px;
}

.billing-tabs {
  display: inline-flex;
  border: 1px solid var(--border-line);
  border-radius: var(--radius-full);
  background: #ffffff;
  padding: 4px;
  gap: 4px;
}

.billing-tab {
  padding: 6px 18px;
  font-size: 0.86rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
  color: var(--text-secondary);
}

.billing-tab.active {
  background: var(--border-line);
  color: #ffffff;
}

.slider-nav {
  display: flex;
  align-items: center;
  gap: 10px;
}

.slider-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border-line);
  background: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  box-shadow: none;
  transition: all var(--transition-fast);
}

.slider-btn:hover {
  background: #f0f0f0;
  transform: none;
  box-shadow: none;
}

.pricing-slider-viewport {
  position: relative;
  overflow: hidden;
  padding: 10px 4px 24px;
}

.pricing-slider-track {
  display: flex;
  gap: 22px;
  overflow-x: auto;
  scroll-behavior: smooth;
  scroll-snap-type: x mandatory;
  padding-bottom: 12px;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--border-line) transparent;
}

.pricing-slider-track::-webkit-scrollbar {
  height: 6px;
}

.pricing-slider-track::-webkit-scrollbar-thumb {
  background-color: var(--border-line);
  border-radius: 3px;
}

.plan-card {
  flex: 0 0 320px;
  scroll-snap-align: start;
  border-radius: var(--radius-md);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  background: #ffffff;
}

.plan-card.featured {
  background: #ffffff;
  border: 1px solid var(--border-line);
  box-shadow: none;
}

.plan-badge-top {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: var(--border-line);
  color: #ffffff;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  letter-spacing: 0.02em;
  line-height: 1.2;
}

.plan-header {
  border-bottom: 1px dashed rgba(17, 17, 17, 0.2);
  padding-bottom: 18px;
  margin-bottom: 18px;
}

.plan-category {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 4px;
}

.plan-name {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 10px;
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.currency {
  font-size: 1.2rem;
  font-weight: 700;
}

.price-amount {
  font-size: 2.3rem;
  font-weight: 900;
  font-family: var(--font-mono);
  line-height: 1;
}

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

.plan-traffic-highlight {
  margin-top: 10px;
  display: inline-block;
  padding: 4px 10px;
  font-size: 0.82rem;
  font-weight: 700;
  font-family: var(--font-mono);
  background: var(--bg-accent);
  border: 1px solid var(--border-line);
  border-radius: var(--radius-sm);
}

.plan-features {
  list-style: none;
  margin-bottom: 24px;
  flex-grow: 1;
}

.plan-features li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 0.88rem;
  margin-bottom: 10px;
  color: var(--text-secondary);
}

.feature-check {
  font-weight: 800;
  color: var(--border-line);
  line-height: 1.3;
}

.plan-footer {
  margin-top: auto;
}

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

/* 指令5: H3 科技感纵向文章流 (Vertical Cyber Stream) */
.section-articles {
  padding: 80px 0;
  border-top: 1px solid var(--border-line);
  background: #f9f9fb;
}

.tech-hud-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border: 1px solid var(--border-line);
  padding: 12px 20px;
  background: #ffffff;
  border-radius: var(--radius-sm);
  margin-bottom: 28px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  box-shadow: none;
}

.hud-status-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
}

.pulse-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background-color: var(--tech-green);
  animation: pulseGlow 1.8s infinite;
}

@keyframes pulseGlow {
  0% { transform: scale(0.9); opacity: 0.7; box-shadow: 0 0 0 0 rgba(40, 167, 69, 0.7); }
  70% { transform: scale(1.1); opacity: 1; box-shadow: 0 0 0 6px rgba(40, 167, 69, 0); }
  100% { transform: scale(0.9); opacity: 0.7; box-shadow: 0 0 0 0 rgba(40, 167, 69, 0); }
}

.vertical-stream-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.stream-card {
  border-radius: var(--radius-md);
  padding: 24px 28px;
  display: grid;
  grid-template-columns: 80px 1fr auto;
  align-items: center;
  gap: 24px;
  text-decoration: none;
  color: inherit;
  position: relative;
  overflow: hidden;
}

.stream-index {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-muted);
  border-right: 1px solid var(--border-line);
  padding-right: 16px;
  display: flex;
  flex-direction: column;
}

.stream-index-label {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
}

.stream-body {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.stream-meta-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.stream-cat-tag {
  font-size: 0.74rem;
  font-weight: 700;
  padding: 2px 8px;
  background: var(--bg-accent);
  border: 1px solid var(--border-line);
  border-radius: 4px;
}

.stream-time {
  font-size: 0.76rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.stream-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.4;
  transition: color var(--transition-fast);
}

.stream-card:hover .stream-title {
  color: var(--apple-blue);
}

.stream-excerpt {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.55;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.stream-keywords {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-top: 4px;
}

.stream-kw-chip {
  font-size: 0.72rem;
  color: var(--text-secondary);
  background: #f1f1f4;
  padding: 2px 8px;
  border-radius: 3px;
  border: 1px solid rgba(17, 17, 17, 0.2);
}

.stream-action {
  display: flex;
  align-items: center;
  justify-content: center;
}

.stream-arrow-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--border-line);
  background: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  box-shadow: none;
  transition: all var(--transition-fast);
}

.stream-card:hover .stream-arrow-btn {
  background: var(--border-line);
  color: #ffffff;
  transform: translate(2px, 0);
}

/* 指令6: H4 用户评价自动轮播 + 节点测速实时自动刷新 */
.section-telemetry {
  padding: 80px 0;
  border-top: 1px solid var(--border-line);
}

.telemetry-grid {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 28px;
}

/* 左侧：用户评价 */
.review-panel {
  padding: 32px 28px;
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  position: relative;
}

.panel-subhead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-line);
}

.panel-title {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.review-slider-wrapper {
  position: relative;
  min-height: 230px;
  overflow: hidden;
}

.review-card-item {
  opacity: 0;
  visibility: hidden;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  transform: translateY(15px);
  transition: opacity 0.45s ease, transform 0.45s ease, visibility 0.45s;
}

.review-card-item.active {
  opacity: 1;
  visibility: visible;
  position: relative;
  transform: translateY(0);
}

.review-stars {
  color: #f59e0b;
  letter-spacing: 2px;
  font-size: 1.05rem;
  margin-bottom: 12px;
}

.review-content {
  font-size: 1rem;
  line-height: 1.65;
  color: var(--text-primary);
  margin-bottom: 20px;
  font-style: normal;
}

.review-author-row {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: auto;
}

.author-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--border-line);
  background: var(--bg-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1rem;
}

.author-meta {
  display: flex;
  flex-direction: column;
}

.author-name {
  font-weight: 700;
  font-size: 0.95rem;
}

.author-role {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.review-nav-dots {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 24px;
  padding-top: 14px;
  border-top: 1px dashed rgba(17, 17, 17, 0.2);
}

.review-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 1px solid var(--border-line);
  background: #ffffff;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.review-dot.active {
  background: var(--border-line);
  width: 24px;
  border-radius: 6px;
}

/* 右侧：实时测速终端 (Speed Test Console) */
.speed-panel {
  padding: 28px;
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
}

.speed-console-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-line);
}

.speed-refresh-badge {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 4px 10px;
  border: 1px solid var(--border-line);
  border-radius: var(--radius-full);
  background: #ffffff;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.speed-table-container {
  overflow-x: auto;
}

.speed-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.86rem;
  font-family: var(--font-mono);
}

.speed-table th {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border-line);
  font-weight: 700;
  font-size: 0.78rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

.speed-table td {
  padding: 12px;
  border-bottom: 1px solid rgba(17, 17, 17, 0.1);
  color: var(--text-primary);
  vertical-align: middle;
}

.speed-table tr:hover td {
  background: rgba(0, 0, 0, 0.02);
}

.node-name-cell {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-family: var(--font-sans);
}

.node-flag {
  font-size: 1.1rem;
}

.node-status-tag {
  display: inline-block;
  font-size: 0.7rem;
  padding: 2px 6px;
  border-radius: 3px;
  border: 1px solid var(--border-line);
  font-weight: 600;
}

.status-optimal {
  background: #e6f7ec;
  color: #0f6c2f;
}

.ping-val {
  font-weight: 700;
  color: #0f6c2f;
}

.speed-val {
  font-weight: 700;
}

/* 核心优势网格 */
.section-features {
  padding: 80px 0;
  border-top: 1px solid var(--border-line);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.feature-box {
  padding: 30px 24px;
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.feature-icon-badge {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-line);
  background: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  box-shadow: none;
  margin-bottom: 6px;
}

.feature-title {
  font-size: 1.15rem;
  font-weight: 800;
}

.feature-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* CTA 转换区 */
.section-cta-banner {
  padding: 60px 0;
}

.cta-banner-box {
  padding: 48px 36px;
  border-radius: var(--radius-md);
  text-align: center;
  position: relative;
  background: #ffffff;
}

.cta-banner-box h3 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.cta-banner-box p {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 28px;
}

/* 页脚 */
.site-footer {
  border-top: 1px solid var(--border-line);
  background: #ffffff;
  padding: 60px 0 32px;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 36px;
  margin-bottom: 48px;
}

.footer-brand-col {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.footer-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  max-width: 320px;
  line-height: 1.6;
}

.footer-col-title {
  font-size: 0.95rem;
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

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

.footer-links-list a {
  font-size: 0.86rem;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  padding-top: 24px;
  border-top: 1px dashed rgba(17, 17, 17, 0.2);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 12px;
}

.footer-legal-links {
  display: flex;
  gap: 18px;
}

/* 响应式适配 */
@media (max-width: 1024px) {
  .hero-stats-row {
    grid-template-columns: repeat(2, 1fr);
  }
  .telemetry-grid {
    grid-template-columns: 1fr;
  }
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  .hero-section {
    padding: 48px 0 40px;
  }
  .hero-title {
    font-size: 1.85rem;
  }
  .hero-desc {
    font-size: 0.98rem;
  }
  .hero-stats-row {
    grid-template-columns: 1fr;
  }
  .stream-card {
    grid-template-columns: 1fr;
    gap: 14px;
  }
  .stream-index {
    border-right: none;
    border-bottom: 1px solid var(--border-line);
    padding-right: 0;
    padding-bottom: 8px;
    flex-direction: row;
    gap: 10px;
    align-items: baseline;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr;
  }
}