/* ==========================================================================
   纸巾云机场 (Tissue Cloud Airport) - 东方古法手漉构皮楮纸与和纸美学设计系统
   Visual Theme: Artisanal Papermaking, Raw Deckle Edge & Bamboo Screen Watermark
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@400;600;700;900&family=Noto+Sans+SC:wght@300;400;500;700&family=Fira+Code:wght@400;500&display=swap');

:root {
  /* 东方纸艺色彩系统 */
  --bg-washi-raw: #F7F5EE;         /* 未漂白天然楮树皮原白底色 */
  --bg-washi-pure: #FAF8F2;        /* 净化浅米白 */
  --bg-card-paper: #FDFCF7;        /* 抄纸明亮纸面 */
  --bg-card-hover: #FFFFFF;        /* 捞纸光泽 */
  
  --color-pine-ink: #2C2A29;       /* 浓松烟墨 / 主标题 */
  --color-ink-medium: #4A4643;     /* 浅焦墨 / 正文 */
  --color-ink-light: #7A7571;      /* 墨韵淡灰 / 辅助标注 */
  --color-paper-border: #E6E1D3;    /* 手漉竹帘交织交界线 */
  --color-paper-shadow: rgba(44, 42, 41, 0.06); /* 柔和纸层阴影 */

  --color-stamp-red: #C84B31;      /* 泥红朱砂印章 Accent */
  --color-stamp-hover: #A93820;    /* 浓朱砂 */
  --color-gold-leaf: #C5A059;      /* 天然构皮金纤微光 */
  --color-gold-bg: rgba(197, 160, 89, 0.08);

  --font-serif: 'Noto Serif SC', 'Songti SC', 'Source Han Serif SC', Georgia, serif;
  --font-sans: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'Fira Code', monospace;

  --border-deckle: 1px solid var(--color-paper-border);
  --radius-deckle: 4px;
  --transition-paper: all 0.35s cubic-bezier(0.25, 1, 0.5, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-washi-raw);
  color: var(--color-ink-medium);
  font-family: var(--font-sans);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

/* 隐约竹帘细密横纹 0.2px 水印背景 */
body {
  background-color: var(--bg-washi-raw);
  background-image: 
    linear-gradient(90deg, rgba(44, 42, 41, 0.02) 1px, transparent 1px),
    linear-gradient(0deg, rgba(44, 42, 41, 0.015) 1px, transparent 1px);
  background-size: 24px 8px; /* 竹帘抄纸帘纹刻度 */
  position: relative;
  overflow-x: hidden;
}

/* 天然毛边纸（Deckle Edge）视觉切片类 */
.deckle-card {
  background-color: var(--bg-card-paper);
  border: var(--border-deckle);
  border-radius: var(--radius-deckle);
  box-shadow: 
    0 4px 20px var(--color-paper-shadow),
    inset 0 0 15px rgba(247, 245, 238, 0.6);
  position: relative;
  transition: var(--transition-paper);
  overflow: hidden;
}

/* 手工毛边撕裂感伪元素点缀 */
.deckle-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: repeating-linear-gradient(
    90deg,
    transparent,
    transparent 4px,
    var(--color-gold-leaf) 4px,
    var(--color-gold-leaf) 8px
  );
  opacity: 0.3;
}

.deckle-card:hover {
  transform: translateY(-4px);
  background-color: var(--bg-card-hover);
  box-shadow: 
    0 12px 32px rgba(44, 42, 41, 0.1),
    inset 0 0 20px rgba(255, 255, 255, 0.8);
  border-color: var(--color-gold-leaf);
}

/* 水膜捞纸（Ripple Transition）微动画 */
.paper-ripple {
  position: relative;
  overflow: hidden;
}
.paper-ripple::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: rgba(255, 255, 255, 0.4);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 0.6s ease-out, height 0.6s ease-out, opacity 0.6s ease-out;
  opacity: 0;
  pointer-events: none;
}
.paper-ripple:hover::after {
  width: 300%;
  height: 300%;
  opacity: 1;
}

/* 容器与排版 */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 朱砂印章 Logo & 标题样式 */
h1, h2, h3, h4, .serif-title {
  font-family: var(--font-serif);
  color: var(--color-pine-ink);
  font-weight: 700;
  line-height: 1.35;
}

.stamp-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 12px;
  background-color: rgba(200, 75, 49, 0.08);
  border: 1px solid rgba(200, 75, 49, 0.25);
  color: var(--color-stamp-red);
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: 2px;
  font-family: var(--font-serif);
}

.stamp-badge::before {
  content: '印';
  display: inline-block;
  width: 18px;
  height: 18px;
  background-color: var(--color-stamp-red);
  color: #FFF;
  font-size: 11px;
  line-height: 18px;
  text-align: center;
  border-radius: 1px;
  font-weight: 900;
}

/* 导航栏 (Navigation Header) */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(247, 245, 238, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-paper-border);
  padding: 16px 0;
  transition: var(--transition-paper);
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--color-pine-ink);
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 900;
  letter-spacing: -0.5px;
}

.logo-stamp {
  width: 36px;
  height: 36px;
  background-color: var(--color-stamp-red);
  color: var(--bg-card-paper);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 900;
  border-radius: 4px;
  box-shadow: 0 2px 8px rgba(200, 75, 49, 0.3);
  position: relative;
}

.logo-stamp::after {
  content: '';
  position: absolute;
  inset: 2px;
  border: 1px dashed rgba(255, 255, 255, 0.4);
}

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

.nav-link {
  text-decoration: none;
  color: var(--color-ink-medium);
  font-weight: 500;
  font-size: 0.95rem;
  transition: var(--transition-paper);
  position: relative;
}

.nav-link:hover, .nav-link.active {
  color: var(--color-stamp-red);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-stamp-red);
  transition: var(--transition-paper);
}

.nav-link:hover::after, .nav-link.active::after {
  width: 100%;
}

/* 按钮样式 */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  background-color: var(--color-stamp-red);
  color: #FFFFFF;
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  border-radius: var(--radius-deckle);
  border: 1px solid var(--color-stamp-hover);
  box-shadow: 0 4px 14px rgba(200, 75, 49, 0.25);
  transition: var(--transition-paper);
  cursor: pointer;
  font-family: var(--font-serif);
}

.btn-primary:hover {
  background-color: var(--color-stamp-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(200, 75, 49, 0.35);
  color: #FFFFFF;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 26px;
  background-color: var(--bg-card-paper);
  color: var(--color-pine-ink);
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  border-radius: var(--radius-deckle);
  border: 1px solid var(--color-paper-border);
  box-shadow: 0 2px 10px var(--color-paper-shadow);
  transition: var(--transition-paper);
  cursor: pointer;
  font-family: var(--font-serif);
}

.btn-secondary:hover {
  border-color: var(--color-gold-leaf);
  color: var(--color-stamp-red);
  transform: translateY(-2px);
}

/* 移动端菜单切换按钮 */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--color-pine-ink);
  cursor: pointer;
}

/* 首页 Hero 首屏 */
.hero-section {
  padding: 80px 0 60px;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 48px;
  align-items: center;
}

.hero-title {
  font-size: 3.2rem;
  line-height: 1.2;
  margin: 20px 0 24px;
  color: var(--color-pine-ink);
  letter-spacing: -1px;
}

.hero-title span {
  color: var(--color-stamp-red);
  position: relative;
  display: inline-block;
}

.hero-title span::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 0;
  right: 0;
  height: 6px;
  background-color: rgba(200, 75, 49, 0.15);
  z-index: -1;
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--color-ink-medium);
  margin-bottom: 32px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}

.hero-features-list {
  display: flex;
  gap: 24px;
  list-style: none;
  border-top: 1px dashed var(--color-paper-border);
  padding-top: 24px;
}

.hero-feature-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.92rem;
  color: var(--color-ink-medium);
}

.hero-feature-item i {
  color: var(--color-stamp-red);
}

.hero-card-preview {
  position: relative;
}

.hero-image-frame {
  position: relative;
  border-radius: var(--radius-deckle);
  overflow: hidden;
  border: 1px solid var(--color-paper-border);
  box-shadow: 0 16px 40px rgba(44, 42, 41, 0.12);
}

.hero-image-frame img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.8s ease;
}

.hero-image-frame:hover img {
  transform: scale(1.03);
}

.hero-status-pill {
  position: absolute;
  bottom: -20px;
  left: 20px;
  right: 20px;
  background-color: var(--bg-card-paper);
  border: 1px solid var(--color-gold-leaf);
  padding: 14px 20px;
  border-radius: var(--radius-deckle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 8px 24px rgba(44, 42, 41, 0.08);
}

.status-dot {
  width: 10px;
  height: 10px;
  background-color: #2E7D32;
  border-radius: 50%;
  display: inline-block;
  box-shadow: 0 0 0 3px rgba(46, 125, 50, 0.2);
  animation: pulse-green 2s infinite;
}

@keyframes pulse-green {
  0% { box-shadow: 0 0 0 0 rgba(46, 125, 50, 0.4); }
  70% { box-shadow: 0 0 0 8px rgba(46, 125, 50, 0); }
  100% { box-shadow: 0 0 0 0 rgba(46, 125, 50, 0); }
}

/* 核心优势板块 */
.section-padding {
  padding: 80px 0;
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 56px;
}

.section-title {
  font-size: 2.25rem;
  margin: 12px 0 16px;
  color: var(--color-pine-ink);
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--color-ink-light);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  padding: 36px 28px;
}

.feature-icon {
  width: 54px;
  height: 54px;
  background-color: rgba(200, 75, 49, 0.08);
  border: 1px solid rgba(200, 75, 49, 0.2);
  color: var(--color-stamp-red);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 1.3rem;
  margin-bottom: 12px;
}

.feature-card p {
  color: var(--color-ink-medium);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* 套餐价格板块 */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.pricing-card {
  padding: 36px 24px;
  display: flex;
  flex-direction: column;
  position: relative;
}

.pricing-card.featured {
  border-color: var(--color-stamp-red);
  box-shadow: 0 12px 36px rgba(200, 75, 49, 0.15);
  background-color: #FFFDF9;
}

.pricing-badge {
  position: absolute;
  top: 0;
  right: 0;
  background-color: var(--color-stamp-red);
  color: #FFF;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 5px 16px;
  border-bottom-left-radius: 6px;
  font-family: var(--font-serif);
  box-shadow: 0 2px 8px rgba(200, 75, 49, 0.25);
  z-index: 10;
}

.pricing-header h3 {
  font-size: 1.35rem;
  margin-bottom: 8px;
}

.pricing-price {
  font-size: 2.5rem;
  font-family: var(--font-serif);
  color: var(--color-stamp-red);
  font-weight: 900;
  margin: 16px 0;
}

.pricing-price span {
  font-size: 1rem;
  color: var(--color-ink-light);
  font-weight: 400;
}

.pricing-features {
  list-style: none;
  margin: 24px 0 32px;
  flex-grow: 1;
}

.pricing-features li {
  margin-bottom: 12px;
  font-size: 0.92rem;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--color-ink-medium);
}

.pricing-features li i {
  color: var(--color-stamp-red);
}

/* 适合人群 */
.audience-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.audience-card {
  padding: 28px;
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.audience-avatar {
  width: 48px;
  height: 48px;
  background-color: var(--color-gold-bg);
  border: 1px solid var(--color-gold-leaf);
  color: var(--color-gold-leaf);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  flex-shrink: 0;
}

.audience-info h3 {
  font-size: 1.15rem;
  margin-bottom: 6px;
}

.audience-info p {
  font-size: 0.9rem;
  color: var(--color-ink-medium);
}

/* 教程入口板块 (Clash / Clash Party) */
.tutorial-section-bg {
  background-color: rgba(247, 245, 238, 0.6);
  border-top: 1px solid var(--color-paper-border);
  border-bottom: 1px solid var(--color-paper-border);
}

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

.tutorial-card-body {
  padding: 36px;
}

.tutorial-card-body h3 {
  font-size: 1.6rem;
  margin: 12px 0 16px;
}

.tutorial-steps {
  list-style: none;
  margin: 20px 0 28px;
}

.tutorial-steps li {
  position: relative;
  padding-left: 32px;
  margin-bottom: 14px;
  font-size: 0.95rem;
}

.tutorial-steps li::before {
  content: counter(step-counter);
  counter-increment: step-counter;
  position: absolute;
  left: 0;
  top: 2px;
  width: 22px;
  height: 22px;
  background-color: var(--color-pine-ink);
  color: var(--bg-card-paper);
  border-radius: 50%;
  font-size: 0.75rem;
  text-align: center;
  line-height: 22px;
  font-weight: 700;
}

.tutorial-steps {
  counter-reset: step-counter;
}

/* FAQ 常见问题折叠面板 */
.faq-container {
  max-width: 900px;
  margin: 0 auto;
}

.faq-item {
  margin-bottom: 16px;
}

.faq-question {
  width: 100%;
  text-align: left;
  padding: 20px 24px;
  background-color: var(--bg-card-paper);
  border: var(--border-deckle);
  border-radius: var(--radius-deckle);
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-pine-ink);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: var(--transition-paper);
}

.faq-question:hover {
  background-color: var(--bg-card-hover);
  color: var(--color-stamp-red);
}

.faq-icon {
  transition: transform 0.3s ease;
  font-size: 1rem;
  color: var(--color-ink-light);
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
  color: var(--color-stamp-red);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease-out, padding 0.4s ease;
  background-color: #FFFDF9;
  border: 1px solid var(--color-paper-border);
  border-top: none;
  border-bottom-left-radius: var(--radius-deckle);
  border-bottom-right-radius: var(--radius-deckle);
}

.faq-item.active .faq-answer {
  max-height: 400px;
  padding: 20px 24px;
}

.faq-answer p {
  color: var(--color-ink-medium);
  font-size: 0.95rem;
  line-height: 1.8;
}

/* 文章目录列表 */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.article-card {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.article-card-content {
  padding: 28px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.article-tag {
  display: inline-block;
  font-size: 0.75rem;
  color: var(--color-gold-leaf);
  font-weight: 600;
  margin-bottom: 10px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.article-card-title {
  font-size: 1.2rem;
  margin-bottom: 12px;
  line-height: 1.4;
}

.article-card-title a {
  text-decoration: none;
  color: var(--color-pine-ink);
  transition: var(--transition-paper);
}

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

.article-card-excerpt {
  font-size: 0.9rem;
  color: var(--color-ink-medium);
  margin-bottom: 20px;
  flex-grow: 1;
  line-height: 1.6;
}

.article-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px dashed var(--color-paper-border);
  padding-top: 14px;
  font-size: 0.82rem;
  color: var(--color-ink-light);
}

/* 页脚 Footer */
.site-footer {
  background-color: #242221;
  color: #E2DFD8;
  padding: 70px 0 30px;
  border-top: 4px solid var(--color-stamp-red);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  margin-bottom: 50px;
}

.footer-brand h2 {
  color: #FFF;
  font-size: 1.5rem;
  margin-bottom: 16px;
}

.footer-brand p {
  color: #A8A39D;
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: 20px;
}

.footer-col h3 {
  color: #FFF;
  font-size: 1.1rem;
  margin-bottom: 20px;
  font-family: var(--font-serif);
  position: relative;
  padding-bottom: 8px;
}

.footer-col h3::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background-color: var(--color-stamp-red);
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  color: #A8A39D;
  text-decoration: none;
  font-size: 0.9rem;
  transition: var(--transition-paper);
}

.footer-links a:hover {
  color: #FFF;
  padding-left: 4px;
}

.footer-bottom {
  border-top: 1px solid #363331;
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: #8C8781;
  flex-wrap: wrap;
  gap: 16px;
}

.keywords-tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.keyword-tag {
  background-color: rgba(255, 255, 255, 0.06);
  color: #B0AAA2;
  font-size: 0.78rem;
  padding: 3px 8px;
  border-radius: 2px;
  text-decoration: none;
}

.keyword-tag:hover {
  background-color: var(--color-stamp-red);
  color: #FFF;
}

/* 单篇文章/教程页面专属样式 */
.article-header {
  padding: 60px 0 40px;
  background-color: rgba(247, 245, 238, 0.8);
  border-bottom: 1px solid var(--color-paper-border);
}

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

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

.breadcrumb a:hover {
  color: var(--color-stamp-red);
}

.article-body {
  padding: 60px 0;
  max-width: 860px;
  margin: 0 auto;
}

.article-content {
  font-size: 1.05rem;
  line-height: 1.95;
  color: var(--color-ink-medium);
}

.article-content h1 {
  font-size: 2.2rem;
  margin-bottom: 24px;
  color: var(--color-pine-ink);
}

.article-content h2 {
  font-size: 1.65rem;
  margin: 40px 0 20px;
  color: var(--color-pine-ink);
  border-left: 4px solid var(--color-stamp-red);
  padding-left: 14px;
}

.article-content h3 {
  font-size: 1.3rem;
  margin: 30px 0 16px;
  color: var(--color-pine-ink);
}

.article-content p {
  margin-bottom: 24px;
}

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

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

.article-content blockquote {
  background-color: var(--bg-card-paper);
  border-left: 4px solid var(--color-gold-leaf);
  padding: 20px 24px;
  margin: 28px 0;
  font-style: italic;
  color: var(--color-ink-medium);
}

.article-content code {
  background-color: #EEE9DC;
  padding: 2px 6px;
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 0.9em;
  color: var(--color-stamp-red);
}

.article-cta-box {
  background-color: #FAF4EB;
  border: 1px solid var(--color-gold-leaf);
  padding: 32px;
  border-radius: var(--radius-deckle);
  text-align: center;
  margin: 40px 0;
}

.article-cta-box h3 {
  font-size: 1.4rem;
  margin-bottom: 12px;
}

.related-articles-box {
  margin-top: 60px;
  padding-top: 40px;
  border-top: 1px solid var(--color-paper-border);
}

/* 响应式适配 Responsive */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .features-grid, .articles-grid, .audience-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--bg-card-paper);
    flex-direction: column;
    padding: 24px;
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
    border-bottom: 1px solid var(--color-paper-border);
  }
  .nav-menu.active {
    display: flex;
  }
  .mobile-toggle {
    display: block;
  }
  .hero-title {
    font-size: 2.2rem;
  }
  .pricing-grid, .features-grid, .articles-grid, .audience-grid, .tutorial-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
}