/* ==========================================================================
   nice cloud - 极光梦境云 (Aurora Dream Cloud) 官方样式库
   Framework: 21｜极光梦境云
   Domain: nice-cloud.homes
   ========================================================================== */

:root {
  /* 调色盘：深蓝底色与极光霓虹渐变 */
  --bg-deep: #060a17;
  --bg-card: rgba(14, 22, 49, 0.72);
  --bg-card-hover: rgba(22, 34, 73, 0.82);
  --bg-surface: #0a1026;
  --bg-elevated: #111a3e;

  /* 极光主色调 */
  --aurora-green: #10e7b2;
  --aurora-cyan: #38bdf8;
  --aurora-purple: #a855f7;
  --aurora-violet: #7c3aed;
  --aurora-glow: linear-gradient(135deg, #10e7b2 0%, #38bdf8 50%, #a855f7 100%);
  --aurora-glow-subtle: linear-gradient(135deg, rgba(16, 231, 178, 0.15) 0%, rgba(56, 189, 248, 0.15) 50%, rgba(168, 85, 247, 0.15) 100%);

  /* 文字颜色 */
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-highlight: #e2e8f0;

  /* 边框与阴影 */
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-aurora: rgba(16, 231, 178, 0.3);
  --border-glow: rgba(56, 189, 248, 0.25);
  --glass-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.6), 0 0 40px -15px rgba(16, 231, 178, 0.15);
  --card-radius: 16px;
  --btn-radius: 9999px;

  /* 间距与版心 */
  --container-max: 1200px;
  --header-height: 72px;
  --transition-normal: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-deep);
  color: var(--text-primary);
  line-height: 1.75;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 15% 10%, rgba(16, 231, 178, 0.12) 0%, transparent 45%),
    radial-gradient(circle at 85% 20%, rgba(168, 85, 247, 0.14) 0%, transparent 50%),
    radial-gradient(circle at 50% 60%, rgba(56, 189, 248, 0.08) 0%, transparent 60%);
  background-attachment: fixed;
}

/* 极光梦境动态云彩背景光斑 */
.aurora-bg-decor {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  overflow: hidden;
}

.aurora-bg-decor::before {
  content: "";
  position: absolute;
  top: -15%;
  left: 20%;
  width: 60vw;
  height: 50vh;
  background: radial-gradient(ellipse at center, rgba(16, 231, 178, 0.09) 0%, rgba(56, 189, 248, 0.04) 50%, transparent 70%);
  filter: blur(80px);
  border-radius: 50%;
}

.aurora-bg-decor::after {
  content: "";
  position: absolute;
  bottom: 10%;
  right: 10%;
  width: 50vw;
  height: 45vh;
  background: radial-gradient(ellipse at center, rgba(168, 85, 247, 0.1) 0%, rgba(124, 58, 237, 0.04) 50%, transparent 70%);
  filter: blur(90px);
  border-radius: 50%;
}

a {
  color: var(--aurora-cyan);
  text-decoration: none;
  transition: var(--transition-normal);
}

a:hover {
  color: var(--aurora-green);
}

img, svg {
  max-width: 100%;
  height: auto;
  vertical-align: middle;
}

/* 容器与版心 */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* 顶部导航栏 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: rgba(6, 10, 23, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
}

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

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

.brand-logo img {
  height: 40px;
  width: auto;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  transition: var(--transition-normal);
  padding: 6px 4px;
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: #ffffff;
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--aurora-glow);
  border-radius: 2px;
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--aurora-glow);
  color: #060a17 !important;
  font-weight: 700;
  font-size: 0.92rem;
  padding: 8px 20px;
  border-radius: var(--btn-radius);
  box-shadow: 0 4px 15px rgba(16, 231, 178, 0.3);
  transition: var(--transition-normal);
}

.nav-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(56, 189, 248, 0.4);
}

/* 移动端菜单按钮 */
.mobile-menu-btn {
  display: none;
  background: transparent;
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  width: 42px;
  height: 42px;
  border-radius: 8px;
  cursor: pointer;
  padding: 8px;
}

/* 按钮通用组件 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 700;
  border-radius: var(--btn-radius);
  transition: var(--transition-normal);
  cursor: pointer;
  text-align: center;
  border: none;
  text-decoration: none;
}

.btn-primary {
  background: var(--aurora-glow);
  color: #060a17;
  padding: 14px 32px;
  font-size: 1.05rem;
  box-shadow: 0 4px 25px rgba(16, 231, 178, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(16, 231, 178, 0.5);
  color: #060a17;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  border: 1px solid rgba(255, 255, 255, 0.15);
  padding: 13px 28px;
  font-size: 1rem;
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--aurora-cyan);
  color: #ffffff;
}

/* Hero Section */
.hero-section {
  padding: 80px 0 60px;
  position: relative;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  border-radius: 9999px;
  background: rgba(16, 231, 178, 0.08);
  border: 1px solid rgba(16, 231, 178, 0.3);
  color: var(--aurora-green);
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero-badge .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--aurora-green);
  box-shadow: 0 0 10px var(--aurora-green);
}

.hero-title {
  font-size: 2.8rem;
  line-height: 1.25;
  font-weight: 900;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
  color: #ffffff;
}

.hero-title .gradient-text {
  background: var(--aurora-glow);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  max-width: 780px;
  margin: 0 auto 36px;
  color: var(--text-secondary);
  font-size: 1.15rem;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.hero-meta-tips {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
  flex-wrap: wrap;
  color: var(--text-muted);
  font-size: 0.88rem;
}

.hero-meta-tips span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* 卡片与网格系统 */
.grid {
  display: grid;
  gap: 24px;
}

.grid-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--card-radius);
  padding: 32px 28px;
  transition: var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.glass-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-glow);
  transform: translateY(-4px);
  box-shadow: var(--glass-shadow);
}

.glass-card .card-icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: var(--aurora-glow-subtle);
  border: 1px solid rgba(16, 231, 178, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 20px;
  color: var(--aurora-green);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 12px;
}

.card-text {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* 页面章节区块 */
.section {
  padding: 64px 0;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 48px;
}

.section-tag {
  color: var(--aurora-cyan);
  font-weight: 700;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 8px;
  display: block;
}

.section-title {
  font-size: 2.1rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

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

/* GEO 直接回答框 (GEO Direct Answer Box) */
.direct-answer-box {
  background: linear-gradient(135deg, rgba(16, 231, 178, 0.08) 0%, rgba(56, 189, 248, 0.06) 100%);
  border: 1px solid rgba(16, 231, 178, 0.3);
  border-left: 4px solid var(--aurora-green);
  border-radius: 12px;
  padding: 20px 24px;
  margin: 20px 0 28px;
}

.direct-answer-box strong {
  color: var(--aurora-green);
  display: block;
  font-size: 0.92rem;
  margin-bottom: 6px;
  letter-spacing: 0.5px;
}

.direct-answer-box p {
  color: var(--text-highlight);
  font-size: 1.02rem;
  line-height: 1.75;
  margin: 0;
}

/* 提示与警告框 (GitHub-Style Callouts) */
.callout {
  padding: 18px 22px;
  border-radius: 12px;
  margin: 24px 0;
  font-size: 0.95rem;
  line-height: 1.7;
  border: 1px solid transparent;
}

.callout-note {
  background: rgba(56, 189, 248, 0.08);
  border-color: rgba(56, 189, 248, 0.25);
  border-left: 4px solid var(--aurora-cyan);
}

.callout-note .callout-title {
  color: var(--aurora-cyan);
  font-weight: 700;
  margin-bottom: 6px;
}

.callout-warning {
  background: rgba(245, 158, 11, 0.08);
  border-color: rgba(245, 158, 11, 0.25);
  border-left: 4px solid #f59e0b;
}

.callout-warning .callout-title {
  color: #f59e0b;
  font-weight: 700;
  margin-bottom: 6px;
}

.callout-tip {
  background: rgba(16, 231, 178, 0.08);
  border-color: rgba(16, 231, 178, 0.25);
  border-left: 4px solid var(--aurora-green);
}

.callout-tip .callout-title {
  color: var(--aurora-green);
  font-weight: 700;
  margin-bottom: 6px;
}

/* 表格样式与响应式横向滑动 */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 28px 0;
  border-radius: 12px;
  border: 1px solid var(--border-subtle);
  background: rgba(10, 16, 38, 0.6);
}

table.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.92rem;
  min-width: 620px;
}

table.data-table th,
table.data-table td {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-subtle);
}

table.data-table th {
  background: rgba(17, 26, 62, 0.85);
  color: #ffffff;
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: 0.5px;
}

table.data-table tr:hover {
  background: rgba(255, 255, 255, 0.02);
}

table.data-table td:first-child {
  font-weight: 600;
  color: var(--aurora-cyan);
}

/* 步骤指示卡片 */
.step-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin: 32px 0;
}

.step-item {
  display: flex;
  gap: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--card-radius);
  padding: 24px;
}

.step-num {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--aurora-glow-subtle);
  border: 1px solid var(--border-aurora);
  color: var(--aurora-green);
  font-weight: 800;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.step-body h4 {
  color: #ffffff;
  font-size: 1.15rem;
  margin-bottom: 8px;
}

.step-body p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* FAQ 手风琴样式 */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  overflow: hidden;
  transition: var(--transition-normal);
}

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

.faq-question {
  width: 100%;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-align: left;
  background: transparent;
  border: none;
  color: #ffffff;
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
}

.faq-question .faq-arrow {
  font-size: 1.2rem;
  color: var(--aurora-cyan);
  transition: transform 0.25s ease;
}

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

.faq-answer {
  display: none;
  padding: 0 24px 22px;
  color: var(--text-secondary);
  font-size: 0.96rem;
  line-height: 1.75;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  padding-top: 16px;
}

.faq-item.active .faq-answer {
  display: block;
}

/* 面包屑导航 */
.breadcrumbs {
  padding: 20px 0;
  font-size: 0.88rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

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

.breadcrumbs a:hover {
  color: var(--aurora-green);
}

.breadcrumbs .sep {
  color: var(--text-muted);
}

.breadcrumbs .current {
  color: var(--text-highlight);
}

/* 文章详情页排版 */
.article-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 40px;
  padding: 30px 0 60px;
}

.article-sidebar {
  position: relative;
}

.sticky-toc {
  position: sticky;
  top: 96px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--card-radius);
  padding: 24px;
}

.toc-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 14px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 0.9rem;
}

.toc-list a {
  color: var(--text-secondary);
  display: block;
  line-height: 1.4;
  padding: 4px 0;
}

.toc-list a:hover,
.toc-list a.active {
  color: var(--aurora-green);
  transform: translateX(4px);
}

.article-main {
  min-width: 0;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--card-radius);
  padding: 44px;
}

.article-header {
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 28px;
  margin-bottom: 32px;
}

.article-title {
  font-size: 2.2rem;
  line-height: 1.35;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 16px;
}

.article-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 18px;
  color: var(--text-muted);
  font-size: 0.88rem;
}

.article-meta span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.article-body {
  font-size: 1.05rem;
  color: #cbd5e1;
  line-height: 1.85;
}

.article-body h2 {
  font-size: 1.55rem;
  color: #ffffff;
  font-weight: 800;
  margin: 40px 0 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-subtle);
}

.article-body h3 {
  font-size: 1.25rem;
  color: var(--aurora-cyan);
  font-weight: 700;
  margin: 28px 0 12px;
}

.article-body p {
  margin-bottom: 18px;
}

.article-body ul,
.article-body ol {
  margin: 16px 0 24px 24px;
}

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

.article-footer-card {
  margin-top: 48px;
  padding: 28px;
  background: rgba(17, 26, 62, 0.6);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
}

.related-articles {
  margin-top: 40px;
  padding-top: 32px;
  border-top: 1px solid var(--border-subtle);
}

.related-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 20px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.related-card {
  background: rgba(10, 16, 38, 0.6);
  border: 1px solid var(--border-subtle);
  border-radius: 10px;
  padding: 16px 20px;
  transition: var(--transition-normal);
}

.related-card:hover {
  border-color: var(--aurora-cyan);
  transform: translateY(-2px);
}

.related-card h4 {
  color: #ffffff;
  font-size: 0.98rem;
  margin-bottom: 6px;
}

.related-card p {
  color: var(--text-muted);
  font-size: 0.84rem;
  margin: 0;
}

/* 用户反馈表单 (替代虚假评价) */
.feedback-box {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--card-radius);
  padding: 36px;
  max-width: 760px;
  margin: 0 auto;
}

.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-size: 0.92rem;
  font-weight: 600;
  color: #ffffff;
  margin-bottom: 8px;
}

.form-control {
  width: 100%;
  padding: 12px 16px;
  background: rgba(6, 10, 23, 0.6);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  color: #ffffff;
  font-size: 0.95rem;
  outline: none;
  transition: var(--transition-normal);
}

.form-control:focus {
  border-color: var(--aurora-green);
  box-shadow: 0 0 0 3px rgba(16, 231, 178, 0.2);
}

textarea.form-control {
  resize: vertical;
  min-height: 120px;
}

/* 底部通用页脚 */
.site-footer {
  background: #040710;
  border-top: 1px solid var(--border-subtle);
  padding: 60px 0 32px;
  margin-top: 80px;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.8fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  margin-top: 16px;
  max-width: 340px;
  line-height: 1.7;
}

.footer-col h5 {
  color: #ffffff;
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 20px;
}

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

.footer-links a {
  color: var(--text-secondary);
  font-size: 0.92rem;
}

.footer-links a:hover {
  color: var(--aurora-green);
}

.footer-bottom {
  padding-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  color: var(--text-muted);
  font-size: 0.86rem;
}

.footer-disclaimer {
  max-width: 760px;
  line-height: 1.6;
}

/* 404 页面风格 */
.error-page-wrapper {
  padding: 100px 0 80px;
  text-align: center;
}

.error-code {
  font-size: 6rem;
  font-weight: 900;
  line-height: 1;
  background: var(--aurora-glow);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 20px;
}

/* ==========================================================================
   响应式断点适配 (移动端优先，完整适配 320px、375px、390px、768px、1024px)
   ========================================================================== */

/* 平板与较小屏幕 (<= 1024px) */
@media (max-width: 1024px) {
  .hero-title {
    font-size: 2.3rem;
  }
  .article-layout {
    grid-template-columns: 1fr;
  }
  .sticky-toc {
    position: static;
    margin-bottom: 30px;
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

/* 平板竖屏 (<= 768px) */
@media (max-width: 768px) {
  .header-inner {
    position: relative;
  }
  .mobile-menu-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }
  .main-nav {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: rgba(6, 10, 23, 0.98);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    flex-direction: column;
    align-items: flex-start;
    padding: 24px;
    gap: 16px;
    border-bottom: 1px solid var(--border-subtle);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.8);
  }
  .main-nav.show {
    display: flex;
  }
  .nav-link {
    width: 100%;
    padding: 10px 0;
    font-size: 1.05rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  }
  .nav-cta {
    width: 100%;
    justify-content: center;
    margin-top: 8px;
    padding: 12px;
  }
  .hero-section {
    padding: 48px 0 40px;
  }
  .hero-title {
    font-size: 1.95rem;
  }
  .hero-desc {
    font-size: 1rem;
  }
  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }
  .article-main {
    padding: 24px 20px;
  }
  .article-title {
    font-size: 1.65rem;
  }
  .related-grid {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr;
  }
}

/* 常见现代智能手机 (<= 390px) */
@media (max-width: 390px) {
  .hero-title {
    font-size: 1.7rem;
  }
  .btn-primary, .btn-secondary {
    width: 100%;
    padding: 12px 20px;
  }
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  .glass-card {
    padding: 22px 18px;
  }
  .step-item {
    flex-direction: column;
    gap: 14px;
  }
  .step-num {
    width: 36px;
    height: 36px;
    font-size: 1rem;
  }
  .article-title {
    font-size: 1.45rem;
  }
}

/* 紧凑型手机 (320px - 375px) */
@media (max-width: 375px) {
  .hero-title {
    font-size: 1.55rem;
  }
  .section-title {
    font-size: 1.6rem;
  }
  .hero-badge {
    font-size: 0.8rem;
    padding: 4px 12px;
  }
  .article-body {
    font-size: 0.98rem;
  }
}