/**
 * Flybit Architectural Wireframe Design System
 * 调性：建筑设计感、严谨工程美学、极简克制
 * 规则：全站无圆角 (border-radius: 0), 无弥散阴影 (box-shadow: none)
 * 色彩：#F6F6F4 (主背景), #D8D8D4 (骨架线框), #1E1E20 (文字主色), #2B3A4A (辅助冷墨蓝), #EFEFED (单元格悬停)
 */

:root {
  --bg-primary: #F6F6F4;
  --wireframe-border: #D8D8D4;
  --text-main: #1E1E20;
  --text-muted: #6E7075;
  --accent-blue: #2B3A4A;
  --hover-tint: #EFEFED;
  --status-green: #2B7A4B;
  --status-amber: #B87A28;
  --status-red: #A63A3A;
  
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Roboto Mono", Consolas, Menlo, Monaco, monospace;
}

/* 全局重置：严格无圆角、无投影 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  border-radius: 0 !important;
  box-shadow: none !important;
  -webkit-font-smoothing: antialiased;
}

html {
  font-size: 15px;
  scroll-behavior: smooth;
  background-color: var(--bg-primary);
  color: var(--text-main);
  font-family: var(--font-sans);
  line-height: 1.6;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-main);
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

/* 动态背景画布 */
#bg-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 0;
  opacity: 0.75;
}

/* 页面主容器包装器 */
.page-wrapper {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 1440px;
  margin: 0 auto;
  border-left: 1px solid var(--wireframe-border);
  border-right: 1px solid var(--wireframe-border);
  background-color: var(--bg-primary);
}

/* 顶部宣传通栏 */
.top-announcement {
  background-color: var(--accent-blue);
  color: #FFFFFF;
  border-bottom: 1px solid var(--wireframe-border);
  padding: 8px 16px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.top-announcement .badge-pill {
  background-color: rgba(255, 255, 255, 0.15);
  padding: 2px 8px;
  margin-right: 8px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  font-weight: 600;
}

.top-announcement .cta-link {
  color: #FFFFFF;
  text-decoration: underline;
  text-underline-offset: 3px;
  font-weight: 600;
  transition: opacity 0.2s ease;
}

.top-announcement .cta-link:hover {
  opacity: 0.8;
}

/* 顶部导航栏 */
.top-navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(246, 246, 244, 0.94);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--wireframe-border);
  display: flex;
  align-items: stretch;
  justify-content: space-between;
  height: 56px;
}

.brand-section {
  display: flex;
  align-items: center;
  padding: 0 28px;
  border-right: 1px solid var(--wireframe-border);
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: 0.04em;
  color: var(--text-main);
  text-decoration: none;
  gap: 12px;
}

.brand-section .blueprint-icon {
  width: 18px;
  height: 18px;
  border: 1.5px solid var(--text-main);
  display: inline-block;
  position: relative;
  flex-shrink: 0;
}
.brand-section .blueprint-icon::after {
  content: "";
  position: absolute;
  top: 3px;
  left: 3px;
  width: 8px;
  height: 8px;
  background-color: var(--accent-blue);
}

.brand-section .brand-text-main {
  font-weight: 900;
  color: var(--text-main);
  letter-spacing: -0.01em;
}

.brand-section .brand-text-tag {
  font-size: 0.85rem;
  font-weight: 700;
  background-color: var(--accent-blue);
  color: #FFFFFF;
  padding: 2px 7px;
  letter-spacing: 0.06em;
  margin-left: 2px;
}

.brand-section .build-ver {
  font-size: 0.68rem;
  color: var(--text-muted);
  font-weight: 400;
  border: 1px solid var(--wireframe-border);
  padding: 1px 5px;
  margin-left: 6px;
}

.nav-links {
  display: flex;
  align-items: stretch;
  list-style: none;
}

.nav-links li {
  border-right: 1px solid var(--wireframe-border);
  display: flex;
}

.nav-links a {
  display: flex;
  align-items: center;
  padding: 0 16px;
  color: var(--text-main);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  transition: background-color 0.15s ease;
}

.nav-links a:hover {
  background-color: var(--hover-tint);
}

.nav-actions {
  display: flex;
  align-items: stretch;
}

.action-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 24px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.action-btn.btn-outline {
  background: transparent;
  color: var(--text-main);
  border-left: 1px solid var(--wireframe-border);
}
.action-btn.btn-outline:hover {
  background-color: var(--hover-tint);
}

.action-btn.btn-solid {
  background: var(--accent-blue);
  color: #FFFFFF;
  border: none;
  border-left: 1px solid var(--wireframe-border);
}
.action-btn.btn-solid:hover {
  background-color: #1a2530;
}

/* 通用网格线段与分区标尺 */
.section-ruler {
  height: 28px;
  background-color: var(--hover-tint);
  border-bottom: 1px solid var(--wireframe-border);
  border-top: 1px solid var(--wireframe-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  user-select: none;
}

.section-ruler .cross-marker {
  font-weight: bold;
  color: var(--text-main);
}

/* 首屏主视口 (Hero Section) */
.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: calc(100vh - 120px);
  border-bottom: 1px solid var(--wireframe-border);
}

.hero-left {
  padding: 56px 48px;
  border-right: 1px solid var(--wireframe-border);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.spec-badge-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
}

.spec-pill {
  padding: 3px 8px;
  border: 1px solid var(--wireframe-border);
  background-color: #FFFFFF;
  color: var(--text-main);
}

.spec-pill.status-live {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border-color: var(--status-green);
  color: var(--status-green);
  font-weight: 600;
}

.pulse-dot {
  width: 6px;
  height: 6px;
  background-color: var(--status-green);
  display: inline-block;
  animation: pulseAnim 2s infinite ease-in-out;
}

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

.hero-title {
  font-size: 3rem;
  line-height: 1.15;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-main);
  margin-bottom: 24px;
}

.brand-mega-label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent-blue);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.brand-mega-label::before {
  content: "";
  display: inline-block;
  width: 12px;
  height: 2px;
  background-color: var(--accent-blue);
}

.hero-brand-name {
  display: block;
  font-size: 4.2rem;
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.05;
  color: var(--text-main);
  margin-bottom: 8px;
  position: relative;
}

.hero-brand-sub {
  display: block;
  font-size: 1.65rem;
  font-weight: 700;
  color: var(--text-muted);
  line-height: 1.35;
  letter-spacing: -0.01em;
}

.hero-desc {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--text-muted);
  margin-bottom: 36px;
  max-width: 540px;
}

.hero-cta-group {
  display: flex;
  gap: 16px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.hero-cta-group .cta-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background-color: var(--accent-blue);
  color: #FFFFFF;
  padding: 16px 32px;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid var(--accent-blue);
  transition: background-color 0.2s ease;
}
.hero-cta-group .cta-primary:hover {
  background-color: #17212b;
}

.hero-cta-group .cta-secondary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background-color: transparent;
  color: var(--text-main);
  padding: 16px 28px;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid var(--wireframe-border);
  transition: background-color 0.2s ease;
}
.hero-cta-group .cta-secondary:hover {
  background-color: var(--hover-tint);
}

.hero-telemetry-strip {
  border-top: 1px solid var(--wireframe-border);
  padding-top: 24px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.telemetry-item {
  font-family: var(--font-mono);
}
.telemetry-item .label {
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 4px;
}
.telemetry-item .value {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
}
.telemetry-item .unit {
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--text-muted);
  margin-left: 2px;
}

/* 首屏右半边：极简线框“全球网络拓扑连线动效” */
.hero-right {
  position: relative;
  background-color: #F8F8F6;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.topology-header {
  border-bottom: 1px solid var(--wireframe-border);
  padding: 10px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  background: var(--bg-primary);
}

.topology-canvas-container {
  flex: 1;
  width: 100%;
  height: 100%;
  position: relative;
  min-height: 400px;
}

#topology-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.topology-overlay-hud {
  position: absolute;
  bottom: 16px;
  left: 16px;
  right: 16px;
  border: 1px solid var(--wireframe-border);
  background: rgba(246, 246, 244, 0.95);
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  pointer-events: none;
}

/* 节点延迟和状态监控板块 */
.telemetry-section {
  border-bottom: 1px solid var(--wireframe-border);
}

.section-head {
  padding: 32px 32px 24px 32px;
  border-bottom: 1px solid var(--wireframe-border);
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  flex-wrap: wrap;
  gap: 16px;
}

.section-title {
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text-main);
  margin-bottom: 6px;
}

.section-subtitle {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.refresh-control {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 6px 14px;
  border: 1px solid var(--wireframe-border);
  background-color: #FFFFFF;
  cursor: pointer;
  user-select: none;
}
.refresh-control:hover {
  background-color: var(--hover-tint);
}

/* 节点监控表格 */
.wireframe-table-wrapper {
  overflow-x: auto;
  width: 100%;
}

.wireframe-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.88rem;
}

.wireframe-table th {
  background-color: var(--hover-tint);
  border-bottom: 1px solid var(--wireframe-border);
  border-right: 1px solid var(--wireframe-border);
  padding: 12px 18px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--text-muted);
  white-space: nowrap;
}
.wireframe-table th:last-child {
  border-right: none;
}

.wireframe-table td {
  border-bottom: 1px solid var(--wireframe-border);
  border-right: 1px solid var(--wireframe-border);
  padding: 14px 18px;
  white-space: nowrap;
  font-family: var(--font-mono);
  transition: background-color 0.15s ease;
}
.wireframe-table td:last-child {
  border-right: none;
}

.wireframe-table tbody tr:hover td {
  background-color: var(--hover-tint);
}

.node-meta {
  display: flex;
  align-items: center;
  gap: 10px;
}
.node-flag {
  font-size: 1.1rem;
}
.node-name {
  font-weight: 700;
  color: var(--text-main);
  font-family: var(--font-sans);
}
.node-city {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  font-weight: 600;
}
.status-badge.optimal {
  color: var(--status-green);
}

.unlock-tags {
  display: flex;
  gap: 6px;
}
.unlock-tag {
  font-size: 0.68rem;
  padding: 2px 6px;
  border: 1px solid var(--wireframe-border);
  background: #FFFFFF;
}

/* 核心优势板块 (网格划分) */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-bottom: 1px solid var(--wireframe-border);
}

.adv-card {
  padding: 36px 32px;
  border-right: 1px solid var(--wireframe-border);
  border-bottom: 1px solid var(--wireframe-border);
  background: var(--bg-primary);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: background-color 0.2s ease;
}

.adv-card:nth-child(3n) {
  border-right: none;
}
.adv-card:nth-last-child(-n+3) {
  border-bottom: none;
}

.adv-card:hover {
  background-color: var(--hover-tint);
}

.adv-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-blue);
  font-weight: 700;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
}

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

.adv-body {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 20px;
}

.adv-spec {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-blue);
  padding: 6px 10px;
  border: 1px solid var(--wireframe-border);
  background: #FFFFFF;
  display: inline-block;
  align-self: flex-start;
}

/* 套餐价格板块：横向贯穿全宽的三格无边距线框表格 */
.pricing-section {
  border-bottom: 1px solid var(--wireframe-border);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  width: 100%;
}

.pricing-card {
  border-right: 1px solid var(--wireframe-border);
  padding: 44px 36px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background: var(--bg-primary);
  transition: background-color 0.15s ease;
  position: relative;
}

.pricing-card:last-child {
  border-right: none;
}

.pricing-card:hover {
  background-color: var(--hover-tint);
}

.pricing-card.featured {
  background-color: #FAF9F7;
}

.pricing-ribbon {
  position: absolute;
  top: 0;
  right: 0;
  background-color: var(--accent-blue);
  color: #FFFFFF;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 600;
  padding: 3px 10px;
}

.plan-header {
  margin-bottom: 28px;
}

.plan-code {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.plan-name {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 8px;
}

.plan-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  min-height: 42px;
}

.plan-pricing-box {
  padding: 20px 0;
  border-top: 1px solid var(--wireframe-border);
  border-bottom: 1px solid var(--wireframe-border);
  margin-bottom: 28px;
  font-family: var(--font-mono);
}

.plan-price-num {
  font-size: 3rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.04em;
  line-height: 1;
}

.plan-price-currency {
  font-size: 1.4rem;
  font-weight: 700;
  margin-right: 4px;
}

.plan-billing-cycle {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-left: 6px;
}

.spec-list {
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  margin-bottom: 36px;
}

.spec-list li {
  padding: 10px 0;
  border-bottom: 1px dashed var(--wireframe-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.spec-list li:last-child {
  border-bottom: none;
}

.spec-list .spec-param {
  color: var(--text-muted);
}
.spec-list .spec-val {
  font-weight: 600;
  color: var(--text-main);
}

.plan-cta-btn {
  display: block;
  width: 100%;
  text-align: center;
  padding: 14px 0;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
  border: 1px solid var(--wireframe-border);
  background: #FFFFFF;
  color: var(--text-main);
  transition: all 0.2s ease;
}

.plan-cta-btn:hover {
  background-color: var(--accent-blue);
  color: #FFFFFF;
  border-color: var(--accent-blue);
}

.featured .plan-cta-btn {
  background-color: var(--accent-blue);
  color: #FFFFFF;
  border-color: var(--accent-blue);
}
.featured .plan-cta-btn:hover {
  background-color: #1a2530;
}

/* 知识库与教程板块 (核心需求/流媒体/AI/游戏 关键字文章聚合) */
.docs-section {
  border-bottom: 1px solid var(--wireframe-border);
}

.docs-filter-tabs {
  display: flex;
  border-bottom: 1px solid var(--wireframe-border);
  background: var(--hover-tint);
  overflow-x: auto;
}

.filter-tab {
  padding: 12px 24px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  border-right: 1px solid var(--wireframe-border);
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  white-space: nowrap;
  border-top: none;
  border-left: none;
  border-bottom: none;
  transition: all 0.15s ease;
}

.filter-tab.active, .filter-tab:hover {
  background: var(--bg-primary);
  color: var(--text-main);
}

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

.doc-card {
  border-right: 1px solid var(--wireframe-border);
  border-bottom: 1px solid var(--wireframe-border);
  padding: 28px 24px;
  background: var(--bg-primary);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  text-decoration: none;
  color: inherit;
  transition: background-color 0.15s ease;
}

.doc-card:nth-child(3n) {
  border-right: none;
}

.doc-card:hover {
  background-color: var(--hover-tint);
}

.doc-header-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.doc-tag {
  border: 1px solid var(--wireframe-border);
  padding: 1px 6px;
  background: #FFFFFF;
}

.doc-title {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text-main);
  margin-bottom: 10px;
}

.doc-excerpt {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
}

.doc-read-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent-blue);
}

/* 常见问题 (FAQ) 板块 */
.faq-section {
  border-bottom: 1px solid var(--wireframe-border);
}

.faq-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
}

.faq-item {
  border-right: 1px solid var(--wireframe-border);
  border-bottom: 1px solid var(--wireframe-border);
  padding: 24px 28px;
  background: var(--bg-primary);
}

.faq-item:nth-child(2n) {
  border-right: none;
}

.faq-question {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 10px;
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.faq-prefix {
  font-family: var(--font-mono);
  color: var(--accent-blue);
  font-weight: bold;
}

.faq-answer {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.65;
  padding-left: 24px;
}

/* 用户评价板块 */
.reviews-section {
  border-bottom: 1px solid var(--wireframe-border);
}

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

.review-card {
  padding: 32px 28px;
  border-right: 1px solid var(--wireframe-border);
  border-bottom: 1px solid var(--wireframe-border);
  background: var(--bg-primary);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.review-card:nth-child(3n) {
  border-right: none;
}

.review-meta-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.review-score {
  color: var(--status-green);
  font-weight: 700;
}

.review-quote {
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--text-main);
  margin-bottom: 24px;
  font-style: normal;
}

.reviewer-profile {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--wireframe-border);
  padding-top: 16px;
}

.reviewer-avatar {
  width: 36px;
  height: 36px;
  border: 1px solid var(--wireframe-border);
  background: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--accent-blue);
}

.reviewer-name {
  font-weight: 700;
  font-size: 0.88rem;
  color: var(--text-main);
}
.reviewer-title {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* 页脚 Footer */
.footer-section {
  background-color: var(--hover-tint);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.footer-top {
  padding: 48px 36px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 32px;
  border-bottom: 1px solid var(--wireframe-border);
}

.footer-brand .footer-desc {
  font-family: var(--font-sans);
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-top: 12px;
  line-height: 1.6;
  max-width: 360px;
}

.footer-col h4 {
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-main);
  margin-bottom: 16px;
}

.footer-col ul {
  list-style: none;
}
.footer-col ul li {
  margin-bottom: 10px;
}
.footer-col ul a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.15s ease;
}
.footer-col ul a:hover {
  color: var(--text-main);
}

.footer-bottom {
  padding: 16px 36px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  color: var(--text-muted);
  font-size: 0.72rem;
}

/* 响应式调整 */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }
  .hero-left {
    border-right: none;
    border-bottom: 1px solid var(--wireframe-border);
    padding: 36px 24px;
  }
  .hero-title {
    font-size: 2.2rem;
  }
  .hero-brand-name {
    font-size: 2.8rem;
  }
  .hero-brand-sub {
    font-size: 1.3rem;
  }
  .pricing-grid,
  .advantages-grid,
  .docs-grid,
  .reviews-grid,
  .faq-container {
    grid-template-columns: 1fr;
  }
  .adv-card,
  .pricing-card,
  .doc-card,
  .review-card,
  .faq-item {
    border-right: none !important;
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .top-navbar {
    height: auto;
    flex-direction: column;
  }
  .brand-section {
    padding: 12px 16px;
    border-right: none;
    border-bottom: 1px solid var(--wireframe-border);
  }
  .nav-links {
    overflow-x: auto;
    border-bottom: 1px solid var(--wireframe-border);
  }
  .nav-links a {
    padding: 10px 12px;
    font-size: 0.78rem;
  }
  .action-btn {
    width: 100%;
    padding: 10px 0;
  }
  .footer-top {
    grid-template-columns: 1fr;
  }
}