/* ==========================================================================
   随便星云 Nebula Cloud 专属视觉方案 - 网际快车官方落地页
   配色基调：深紫宇宙背景、发光星云渐变、高对比度稳定内容卡、无障碍触控与移动端优化
   ========================================================================== */

:root {
  /* 宇宙与星云主色彩 */
  --space-bg-darkest: #090614;
  --space-bg-dark: #0f0a21;
  --space-bg-mid: #161033;
  --card-bg-solid: #181238;
  --card-bg-elevated: #20184a;
  --card-border: rgba(168, 85, 247, 0.25);
  --card-border-hover: rgba(192, 132, 252, 0.55);

  /* 发光星云高亮 */
  --nebula-purple: #a855f7;
  --nebula-purple-glow: #c084fc;
  --nebula-cyan: #38bdf8;
  --nebula-cyan-glow: #7dd3fc;
  --nebula-pink: #ec4899;
  --nebula-amber: #f59e0b;
  --nebula-emerald: #10b981;

  /* 文字系统与对比度保证 */
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --text-accent: #c084fc;

  /* 尺寸与间距规范 */
  --container-max-width: 1200px;
  --container-article-width: 860px;
  --touch-target-min: 44px;
  --border-radius-sm: 8px;
  --border-radius-md: 12px;
  --border-radius-lg: 18px;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --transition-base: 0.25s ease;
}

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

html {
  font-family: var(--font-family);
  background-color: var(--space-bg-darkest);
  color: var(--text-primary);
  line-height: 1.68;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow-x: hidden;
  background: radial-gradient(circle at 50% 0%, #201347 0%, #0f0a22 45%, #090614 100%);
  background-attachment: fixed;
}

/* 链接无障碍规范 */
a {
  color: var(--nebula-cyan);
  text-decoration: none;
  transition: color var(--transition-base), text-shadow var(--transition-base);
}

a:hover, a:focus-visible {
  color: var(--nebula-cyan-glow);
  text-decoration: underline;
  text-underline-offset: 4px;
}

a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible {
  outline: 2px solid var(--nebula-cyan);
  outline-offset: 3px;
}

/* 容器居中与自适应 */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

.article-container {
  width: 100%;
  max-width: var(--container-article-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* ==========================================================================
   背景星云 Canvas 与静态替代层（渐进增强）
   ========================================================================== */
#nebula-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  opacity: 0.65;
}

.main-content {
  position: relative;
  z-index: 1;
  flex: 1 0 auto;
}

/* ==========================================================================
   全局导航栏 Header
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15, 10, 33, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(168, 85, 247, 0.2);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  text-decoration: none !important;
}

.brand-icon-nebula {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: linear-gradient(135deg, #a855f7 0%, #38bdf8 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 16px rgba(168, 85, 247, 0.6);
  color: #fff;
  font-weight: 900;
  font-size: 1.1rem;
}

.brand-tagline-badge {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--nebula-cyan);
  background: rgba(56, 189, 248, 0.12);
  padding: 2px 8px;
  border-radius: 4px;
  border: 1px solid rgba(56, 189, 248, 0.25);
  margin-left: 6px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

.site-nav a {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 8px 12px;
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-base);
  text-decoration: none;
  min-height: var(--touch-target-min);
  display: inline-flex;
  align-items: center;
}

.site-nav a:hover, .site-nav a.active {
  color: #fff;
  background: rgba(168, 85, 247, 0.18);
}

.header-cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: var(--touch-target-min);
  padding: 0 20px;
  font-size: 0.95rem;
  font-weight: 600;
  color: #fff !important;
  background: linear-gradient(135deg, #9333ea 0%, #0284c7 100%);
  border-radius: var(--border-radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.25);
  box-shadow: 0 4px 14px rgba(147, 51, 234, 0.4);
  text-decoration: none !important;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.header-cta-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(56, 189, 248, 0.5);
}

/* 移动端汉堡菜单按钮 */
.mobile-menu-toggle {
  display: none;
  background: transparent;
  border: 1px solid rgba(168, 85, 247, 0.4);
  color: var(--text-primary);
  width: var(--touch-target-min);
  height: var(--touch-target-min);
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
}

/* ==========================================================================
   Hero 首屏视觉 (星云 Hero)
   ========================================================================== */
.hero-section {
  padding: 80px 0 60px;
  text-align: center;
  position: relative;
}

.hero-pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(168, 85, 247, 0.15);
  border: 1px solid rgba(192, 132, 252, 0.35);
  padding: 6px 16px;
  border-radius: 9999px;
  color: var(--nebula-purple-glow);
  font-size: 0.88rem;
  font-weight: 500;
  margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(1.45rem, 4.5vw, 2.75rem);
  line-height: 1.35;
  font-weight: 800;
  letter-spacing: -0.01em;
  margin-bottom: 20px;
  background: linear-gradient(135deg, #ffffff 30%, #c084fc 70%, #38bdf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  word-break: break-word;
  max-width: 100%;
}

.hero-subtitle {
  font-size: 1.18rem;
  color: var(--text-secondary);
  max-width: 760px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.cta-btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 52px;
  padding: 0 32px;
  font-size: 1.05rem;
  font-weight: 600;
  color: #fff !important;
  background: linear-gradient(135deg, #a855f7 0%, #2563eb 100%);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--border-radius-md);
  box-shadow: 0 8px 24px rgba(168, 85, 247, 0.45);
  text-decoration: none !important;
  transition: all var(--transition-base);
}

.cta-btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 30px rgba(56, 189, 248, 0.6);
}

.cta-btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 0 28px;
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--text-primary) !important;
  background: rgba(32, 24, 74, 0.8);
  border: 1px solid var(--card-border);
  border-radius: var(--border-radius-md);
  text-decoration: none !important;
  transition: all var(--transition-base);
}

.cta-btn-secondary:hover {
  background: rgba(45, 34, 100, 0.9);
  border-color: var(--nebula-purple);
  color: #fff !important;
}

/* ==========================================================================
   快捷入口栏 (应用问题入口)
   ========================================================================== */
.quick-entry-section {
  padding: 40px 0 60px;
}

.section-header-center {
  text-align: center;
  margin-bottom: 40px;
}

.section-label {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--nebula-purple-glow);
  margin-bottom: 8px;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 680px;
  margin: 0 auto;
}

.quick-entry-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.quick-entry-card {
  background: var(--card-bg-solid);
  border: 1px solid var(--card-border);
  border-radius: var(--border-radius-md);
  padding: 24px;
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.quick-entry-card:hover {
  border-color: var(--card-border-hover);
  transform: translateY(-3px);
  box-shadow: 0 10px 25px rgba(168, 85, 247, 0.2);
}

.entry-card-icon {
  font-size: 2rem;
  margin-bottom: 16px;
  display: inline-block;
}

.entry-card-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
}

.entry-card-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
}

.entry-card-link {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--nebula-cyan);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* ==========================================================================
   实用功能组件：应用问题分类器 (Layered Issue Classifier)
   ========================================================================== */
.tool-section {
  padding: 50px 0 70px;
}

.classifier-tool-wrapper {
  background: var(--card-bg-solid);
  border: 1px solid rgba(168, 85, 247, 0.35);
  border-radius: var(--border-radius-lg);
  padding: 36px;
  box-shadow: 0 12px 40px rgba(9, 6, 20, 0.7);
}

.classifier-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

@media (max-width: 860px) {
  .classifier-grid {
    grid-template-columns: 1fr;
  }
}

.classifier-input-panel {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-group label {
  display: block;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.form-control-select, .form-control-input {
  width: 100%;
  min-height: var(--touch-target-min);
  padding: 10px 14px;
  background: var(--space-bg-darkest);
  border: 1px solid var(--card-border);
  border-radius: var(--border-radius-sm);
  color: #fff;
  font-size: 0.95rem;
  font-family: inherit;
  transition: border-color var(--transition-base);
}

.form-control-select:focus, .form-control-input:focus {
  border-color: var(--nebula-cyan);
}

.classifier-result-panel {
  background: var(--space-bg-dark);
  border: 1px solid rgba(56, 189, 248, 0.3);
  border-radius: var(--border-radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.result-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.badge-network { background: rgba(56, 189, 248, 0.2); color: var(--nebula-cyan); border: 1px solid rgba(56, 189, 248, 0.4); }
.badge-account { background: rgba(236, 72, 153, 0.2); color: var(--nebula-pink); border: 1px solid rgba(236, 72, 153, 0.4); }
.badge-region { background: rgba(245, 158, 11, 0.2); color: var(--nebula-amber); border: 1px solid rgba(245, 158, 11, 0.4); }
.badge-quota { background: rgba(168, 85, 247, 0.2); color: var(--nebula-purple-glow); border: 1px solid rgba(168, 85, 247, 0.4); }
.badge-outage { background: rgba(239, 68, 68, 0.2); color: #f87171; border: 1px solid rgba(239, 68, 68, 0.4); }

.result-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
}

.result-analysis {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 16px;
}

.result-action-box {
  background: rgba(24, 18, 56, 0.8);
  border-left: 3px solid var(--nebula-cyan);
  padding: 12px 16px;
  border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
  font-size: 0.9rem;
  color: var(--text-primary);
}

/* ==========================================================================
   六篇文章精选卡片 (Articles Section)
   ========================================================================== */
.articles-section {
  padding: 60px 0 80px;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.article-card {
  background: var(--card-bg-solid);
  border: 1px solid var(--card-border);
  border-radius: var(--border-radius-md);
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-base);
}

.article-card:hover {
  border-color: var(--card-border-hover);
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(168, 85, 247, 0.25);
}

.article-meta-row {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.article-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.45;
  margin-bottom: 12px;
}

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

.article-card-title a:hover {
  color: var(--nebula-cyan-glow);
}

.article-card-desc {
  font-size: 0.94rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 20px;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px solid rgba(168, 85, 247, 0.15);
  font-size: 0.9rem;
}

/* ==========================================================================
   套餐说明区块 (Packages Section)
   ========================================================================== */
.plans-section {
  padding: 60px 0 80px;
  background: rgba(15, 10, 33, 0.6);
  border-top: 1px solid rgba(168, 85, 247, 0.15);
  border-bottom: 1px solid rgba(168, 85, 247, 0.15);
}

.plans-notice-box {
  background: rgba(168, 85, 247, 0.1);
  border: 1px solid rgba(168, 85, 247, 0.3);
  border-radius: var(--border-radius-md);
  padding: 16px 20px;
  margin-bottom: 32px;
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.plans-notice-box strong {
  color: var(--nebula-purple-glow);
}

.packages-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.package-card {
  background: var(--card-bg-solid);
  border: 1px solid var(--card-border);
  border-radius: var(--border-radius-lg);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-base);
}

.package-card.popular {
  border-color: var(--nebula-purple);
  box-shadow: 0 0 25px rgba(168, 85, 247, 0.3);
}

.popular-badge {
  position: absolute;
  top: -12px;
  right: 20px;
  background: linear-gradient(135deg, #a855f7 0%, #ec4899 100%);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 12px;
  border-radius: 9999px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.package-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
}

.package-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 8px;
}

.package-currency {
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--nebula-cyan);
}

.package-amount {
  font-size: 2.5rem;
  font-weight: 800;
  color: #fff;
  line-height: 1;
}

.package-period {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.package-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid rgba(168, 85, 247, 0.15);
  line-height: 1.5;
}

.package-features {
  list-style: none;
  margin-bottom: 28px;
  flex-grow: 1;
}

.package-features li {
  font-size: 0.92rem;
  color: var(--text-primary);
  margin-bottom: 10px;
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.package-features li::before {
  content: "✔";
  color: var(--nebula-cyan);
  font-weight: bold;
}

/* ==========================================================================
   真实空态评价区块 (Reviews Section)
   严格遵守第九条：真实空态，不编造头像、昵称、评语、星级
   ========================================================================== */
.reviews-section {
  padding: 60px 0;
}

.reviews-empty-card {
  background: var(--card-bg-solid);
  border: 1px dashed rgba(168, 85, 247, 0.4);
  border-radius: var(--border-radius-lg);
  padding: 40px 24px;
  text-align: center;
  max-width: 760px;
  margin: 0 auto;
}

.empty-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
  display: inline-block;
  opacity: 0.85;
}

.empty-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 10px;
}

.empty-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.68;
}

/* ==========================================================================
   FAQ 常见问题折叠面板 (FAQ Section)
   ========================================================================== */
.faq-section {
  padding: 60px 0 80px;
}

.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.faq-item:hover {
  border-color: var(--card-border-hover);
}

.faq-question {
  width: 100%;
  min-height: 56px;
  padding: 16px 20px;
  background: transparent;
  border: none;
  color: #fff;
  font-size: 1.05rem;
  font-weight: 600;
  text-align: left;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-family: inherit;
}

.faq-icon {
  font-size: 1.2rem;
  color: var(--nebula-cyan);
  transition: transform var(--transition-base);
}

.faq-item.open .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
  background: rgba(9, 6, 20, 0.4);
}

.faq-item.open .faq-answer {
  max-height: 500px;
}

.faq-answer p {
  padding: 0 20px 20px;
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ==========================================================================
   文章详情页样式 (Article Detail)
   ========================================================================== */
.article-header {
  padding: 60px 0 40px;
  border-bottom: 1px solid rgba(168, 85, 247, 0.2);
  margin-bottom: 40px;
}

.breadcrumb-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.breadcrumb-nav a {
  color: var(--text-secondary);
}

.breadcrumb-nav a:hover {
  color: var(--nebula-cyan);
}

.article-h1 {
  font-size: 2.2rem;
  line-height: 1.35;
  font-weight: 800;
  color: #fff;
  margin-bottom: 20px;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 0.9rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.article-body {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-secondary);
}

.article-body h2 {
  font-size: 1.55rem;
  color: #fff;
  margin-top: 48px;
  margin-bottom: 18px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(168, 85, 247, 0.2);
}

.article-body h3 {
  font-size: 1.25rem;
  color: var(--nebula-purple-glow);
  margin-top: 32px;
  margin-bottom: 14px;
}

.article-body p {
  margin-bottom: 20px;
}

.article-body ul, .article-body ol {
  margin-bottom: 24px;
  padding-left: 24px;
}

.article-body li {
  margin-bottom: 8px;
}

.article-body code {
  background: rgba(168, 85, 247, 0.15);
  color: var(--nebula-cyan-glow);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: Consolas, Monaco, "Courier New", monospace;
  font-size: 0.9em;
}

.article-body pre {
  background: #0d091e;
  border: 1px solid rgba(168, 85, 247, 0.3);
  border-radius: var(--border-radius-md);
  padding: 18px 20px;
  overflow-x: auto;
  margin-bottom: 24px;
}

.article-body pre code {
  background: transparent;
  color: #e2e8f0;
  padding: 0;
  font-size: 0.92rem;
}

.quote-box {
  background: rgba(24, 18, 56, 0.85);
  border-left: 4px solid var(--nebula-purple);
  padding: 16px 20px;
  border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
  margin-bottom: 24px;
  font-style: normal;
  color: var(--text-primary);
}

/* 响应式表格 */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  margin-bottom: 28px;
  border: 1px solid var(--card-border);
  border-radius: var(--border-radius-md);
  background: var(--card-bg-solid);
}

.table-responsive table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.92rem;
  min-width: 600px;
}

.table-responsive th {
  background: var(--card-bg-elevated);
  color: #fff;
  padding: 14px 18px;
  font-weight: 600;
  border-bottom: 1px solid rgba(168, 85, 247, 0.3);
}

.table-responsive td {
  padding: 14px 18px;
  border-bottom: 1px solid rgba(168, 85, 247, 0.12);
  color: var(--text-secondary);
}

.table-responsive tr:last-child td {
  border-bottom: none;
}

/* 任务清单样式 */
.checklist-item {
  list-style: none;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 8px;
}

.check-box-icon {
  font-size: 1.1rem;
  color: var(--nebula-cyan);
}

/* 文章页底栏导航与推荐 */
.article-footer-nav {
  margin-top: 60px;
  padding-top: 30px;
  border-top: 1px solid rgba(168, 85, 247, 0.2);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

/* ==========================================================================
   全局页脚 Footer
   ========================================================================== */
.site-footer {
  background: #07040f;
  border-top: 1px solid rgba(168, 85, 247, 0.2);
  padding: 60px 0 30px;
  margin-top: 80px;
}

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

.footer-brand-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-top: 12px;
  max-width: 420px;
}

.footer-col h4 {
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
}

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

.footer-links a {
  color: var(--text-secondary);
  font-size: 0.92rem;
  display: inline-block;
  min-height: 32px;
  line-height: 32px;
}

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

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 12px;
}

/* ==========================================================================
   移动端与窄屏适配媒体查询 (360px ~ 860px)
   ========================================================================== */
@media (max-width: 860px) {
  .site-nav {
    display: none;
    position: absolute;
    top: 68px;
    left: 0;
    width: 100%;
    background: #0f0a21;
    border-bottom: 1px solid rgba(168, 85, 247, 0.3);
    flex-direction: column;
    padding: 20px;
    gap: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.8);
  }

  .site-nav.open {
    display: flex;
  }

  .mobile-menu-toggle {
    display: flex;
  }

  .site-header .header-cta-btn {
    display: none !important; /* 移动端顶栏隐藏按钮，由汉堡菜单及Hero主CTA承接，防止宽度溢出 */
  }

  .brand-tagline-badge {
    display: none;
  }

  .header-inner {
    height: 60px;
  }

  .container, .article-container {
    padding-left: 16px;
    padding-right: 16px;
  }

  .hero-section {
    padding: 50px 0 40px;
  }

  .hero-title {
    font-size: 1.8rem;
    line-height: 1.35;
    word-break: break-word;
  }

  .hero-subtitle {
    font-size: 1rem;
    margin-bottom: 28px;
  }

  .hero-cta-group {
    flex-direction: column;
    width: 100%;
    gap: 12px;
  }

  .cta-btn-primary, .cta-btn-secondary {
    width: 100%;
    box-sizing: border-box;
    text-align: center;
    padding: 0 16px;
  }

  .quick-entry-grid, .articles-grid, .packages-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
}

@media (max-width: 480px) {
  html {
    font-size: 15px;
  }

  .hero-title {
    font-size: 1.5rem;
  }

  .classifier-tool-wrapper {
    padding: 16px;
  }

  .package-card {
    padding: 20px 16px;
  }

  .section-title {
    font-size: 1.5rem;
  }
}

/* ==========================================================================
   无障碍与高对比度支持 (prefers-reduced-motion)
   ========================================================================== */
@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;
  }

  #nebula-canvas {
    display: none !important;
  }
}