/* ==========================================================================
   SSRDOG 机场官网 - 浅色系卡通风主题 (Clean Normal Fonts + Cartoon Theme)
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&family=Noto+Sans+SC:wght@400;500;700;900&display=swap');

:root {
  /* Color Palette - Light Cartoon Pastel */
  --bg-dark: #ffffff;
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-card: #ffffff;
  --bg-card-hover: #f8fafc;
  --bg-card-alt: #e2e8f0;
  
  --border-color: #0f172a;
  --border-subtle: #cbd5e1;
  
  --text-main: #0f172a;
  --text-sub: #334155;
  --text-muted: #64748b;
  
  /* Accent Colors */
  --accent-green: #10b981;
  --accent-green-hover: #059669;
  --accent-yellow: #fbbf24;
  --accent-yellow-hover: #f59e0b;
  --accent-cyan: #06b6d4;
  --accent-red: #ef4444;
  --accent-pink: #f43f5e;
  --accent-purple: #8b5cf6;
  
  /* Cartoon Shadow Utilities */
  --pixel-shadow-sm: 2px 2px 0px #0f172a;
  --pixel-shadow-md: 4px 4px 0px #0f172a;
  --pixel-shadow-lg: 6px 6px 0px #0f172a;
  --pixel-shadow-pink: 4px 4px 0px #f43f5e;
  
  /* Typography - Clean Sans Serif */
  --font-sans: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-pixel-en: var(--font-sans);
  --font-pixel-zh: var(--font-sans);
  
  /* Layout */
  --max-width: 1200px;
  --header-height: 76px;
  --radius-pixel: 8px;
}

/* Global Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background-color: var(--bg-primary);
  background-image: 
    radial-gradient(rgba(15, 23, 42, 0.05) 1.5px, transparent 0),
    linear-gradient(to bottom, #f8fafc, #f1f5f9);
  background-size: 24px 24px, 100% 100%;
  color: var(--text-main);
  font-family: var(--font-sans);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
}

/* Selection & Scrollbar */
::selection {
  background-color: var(--accent-yellow);
  color: #0f172a;
}

::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: #cbd5e1;
  border: 2px solid var(--border-color);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent-green);
}

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.15s ease;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Typography Classes */
.font-pixel-en, .font-pixel-zh, .pixel-title {
  font-family: var(--font-sans);
  font-weight: 800;
  letter-spacing: -0.2px;
}

/* Container */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* Cartoon Badges & Tags */
.pixel-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #ffffff;
  border: 2.5px solid var(--border-color);
  box-shadow: var(--pixel-shadow-sm);
  padding: 4px 14px;
  font-size: 0.95rem;
  font-weight: 700;
  color: #047857;
  border-radius: 6px;
}

.pixel-badge.yellow {
  background: #fffbeb;
  color: #b45309;
}

.pixel-badge.cyan {
  background: #ecfeff;
  color: #0e7490;
}

.dot-pulse {
  width: 10px;
  height: 10px;
  background-color: var(--accent-green);
  box-shadow: 0 0 6px var(--accent-green);
  border: 1.5px solid #000;
  border-radius: 50%;
  animation: pixelPulse 1.5s infinite;
}

@keyframes pixelPulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.85); }
}

/* Buttons - Clean Cartoon Bold */
.pixel-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-family: var(--font-sans);
  font-size: 1.1rem;
  font-weight: 800;
  padding: 12px 24px;
  background-color: var(--accent-green);
  color: #ffffff;
  border: 3px solid var(--border-color);
  box-shadow: var(--pixel-shadow-md);
  border-radius: var(--radius-pixel);
  cursor: pointer;
  user-select: none;
  transition: transform 0.1s ease, box-shadow 0.1s ease, background-color 0.15s ease;
}

.pixel-btn:hover {
  background-color: var(--accent-green-hover);
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0px var(--border-color);
}

.pixel-btn:active {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0px var(--border-color);
}

.pixel-btn.btn-pink {
  background-color: var(--accent-pink);
  color: #ffffff;
}

.pixel-btn.btn-pink:hover {
  background-color: #e11d48;
}

.pixel-btn.btn-yellow {
  background-color: var(--accent-yellow);
  color: #0f172a;
}

.pixel-btn.btn-yellow:hover {
  background-color: var(--accent-yellow-hover);
}

.pixel-btn.btn-secondary {
  background-color: #ffffff;
  color: var(--text-main);
}

.pixel-btn.btn-secondary:hover {
  background-color: #f1f5f9;
  color: #047857;
}

.pixel-btn.btn-lg {
  padding: 16px 36px;
  font-size: 1.2rem;
}

.pixel-btn.btn-block {
  width: 100%;
}

/* Card Container */
.pixel-card {
  background-color: var(--bg-card);
  border: 3px solid var(--border-color);
  box-shadow: var(--pixel-shadow-md);
  border-radius: var(--radius-pixel);
  padding: 28px;
  position: relative;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.pixel-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--pixel-shadow-lg);
}

/* Header & Navbar */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 3px solid var(--border-color);
  height: var(--header-height);
  display: flex;
  align-items: center;
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.6rem;
  font-weight: 900;
  color: var(--text-main);
}

.brand-logo span.accent {
  color: #059669;
}

.logo-pixel-dog {
  width: 42px;
  height: 42px;
  background: var(--accent-yellow);
  border: 3px solid var(--border-color);
  box-shadow: 2px 2px 0 var(--border-color);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

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

.nav-link {
  font-size: 1.05rem;
  color: var(--text-sub);
  padding: 6px 10px;
  border-bottom: 3px solid transparent;
  font-weight: 700;
}

.nav-link:hover, .nav-link.active {
  color: #059669;
  border-bottom-color: #059669;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.mobile-toggle {
  display: none;
  background: #ffffff;
  border: 2.5px solid var(--border-color);
  box-shadow: 2px 2px 0 var(--border-color);
  color: var(--text-main);
  padding: 8px 12px;
  cursor: pointer;
  font-size: 1.4rem;
  border-radius: 4px;
}

/* Announcement Bar */
.announcement-bar {
  background-color: #fffbeb;
  border-bottom: 3px solid var(--border-color);
  padding: 8px 0;
  font-size: 0.95rem;
  color: #92400e;
  font-weight: 700;
  overflow: hidden;
}

.marquee-content {
  display: flex;
  gap: 40px;
  white-space: nowrap;
  animation: marquee 25s linear infinite;
}

@keyframes marquee {
  0% { transform: translateX(100%); }
  100% { transform: translateX(-100%); }
}

/* Hero Section */
.hero-section {
  padding: 60px 0 50px;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
  align-items: center;
}

.hero-text h1 {
  font-size: 2.7rem;
  font-weight: 900;
  line-height: 1.25;
  margin: 18px 0;
  color: var(--text-main);
}

.hero-text h1 span.highlight {
  color: #059669;
  background: #d1fae5;
  padding: 2px 10px;
  border: 2.5px solid var(--border-color);
  box-shadow: 3px 3px 0 var(--border-color);
  display: inline-block;
  border-radius: 6px;
}

.hero-description {
  font-size: 1.1rem;
  color: var(--text-sub);
  margin-bottom: 28px;
  line-height: 1.7;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 32px;
}

.hero-tag {
  background: #ffffff;
  border: 2px solid var(--border-color);
  box-shadow: 2px 2px 0 var(--border-color);
  padding: 6px 14px;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-main);
  border-radius: 6px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.hero-tag svg {
  color: var(--accent-green);
}

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

/* Screen Visual Card */
.pixel-screen-card {
  background: #ffffff;
  border: 4px solid var(--border-color);
  box-shadow: 8px 8px 0 var(--border-color);
  border-radius: 12px;
  padding: 20px;
  position: relative;
  overflow: hidden;
}

.screen-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 3px solid var(--border-color);
  padding: 8px 12px;
  margin-bottom: 20px;
  background: #f1f5f9;
  border-radius: 6px;
}

.screen-dots {
  display: flex;
  gap: 6px;
}

.screen-dot {
  width: 12px;
  height: 12px;
  border: 2px solid var(--border-color);
  border-radius: 50%;
}

.screen-dot.red { background: var(--accent-red); }
.screen-dot.yellow { background: var(--accent-yellow); }
.screen-dot.green { background: var(--accent-green); }

.screen-title {
  font-size: 0.8rem;
  color: var(--text-sub);
  font-weight: 800;
}

.screen-body {
  text-align: center;
  padding: 10px 5px;
}

.mascot-container {
  margin: 0 auto 20px;
  width: 140px;
  height: 140px;
  position: relative;
}

.pixel-dog-svg {
  width: 100%;
  height: 100%;
  filter: drop-shadow(4px 4px 0 var(--border-color));
  animation: dogFloat 3s ease-in-out infinite;
}

@keyframes dogFloat {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-8px); }
}

.stat-box-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 20px;
}

.stat-mini-card {
  background: #f8fafc;
  border: 2.5px solid var(--border-color);
  box-shadow: 2px 2px 0 var(--border-color);
  padding: 10px;
  text-align: center;
  border-radius: 6px;
}

.stat-value {
  font-size: 1.4rem;
  color: #059669;
  font-weight: 900;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 700;
}

/* Sections Styling */
.section-title-wrap {
  text-align: center;
  margin-bottom: 48px;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--text-main);
  margin-bottom: 12px;
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  display: block;
  width: 60%;
  height: 4px;
  background: var(--accent-yellow);
  margin: 10px auto 0;
  border: 1.5px solid var(--border-color);
  box-shadow: 2px 2px 0 var(--border-color);
  border-radius: 2px;
}

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

/* Features Section */
.features-section {
  padding: 80px 0;
  background: #ffffff;
  border-top: 3px solid var(--border-color);
  border-bottom: 3px solid var(--border-color);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.feature-icon {
  width: 54px;
  height: 54px;
  background: #fffbeb;
  border: 3px solid var(--border-color);
  box-shadow: 3px 3px 0 var(--border-color);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  margin-bottom: 18px;
}

.feature-card h3 {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 10px;
  color: var(--text-main);
}

.feature-card p {
  color: var(--text-sub);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* ==========================================================================
   Pricing Section (Matching ssrdog.app official price reference)
   ========================================================================== */
.pricing-section {
  padding: 80px 0;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 28px;
  align-items: stretch;
}

.pricing-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background: #ffffff;
  border: 3px solid var(--border-color);
  box-shadow: var(--pixel-shadow-md);
  border-radius: 16px;
  padding: 32px 28px;
  position: relative;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.pricing-card:hover {
  transform: translateY(-6px);
  box-shadow: 8px 8px 0 var(--border-color);
}

/* Middle Recommended Card (Matching Dark Accent in Reference Screenshot) */
.pricing-card.recommended {
  background: #181824;
  color: #ffffff;
  border: 3px solid var(--border-color);
  box-shadow: 8px 8px 0 var(--border-color);
}

.pricing-card.recommended .pricing-subtitle,
.pricing-card.recommended .pricing-period,
.pricing-card.recommended .pricing-features li {
  color: #cbd5e1;
}

.pricing-card.recommended .pricing-title {
  color: #ffffff;
}

.pricing-card.recommended .pricing-amount {
  color: #ffffff;
}

.recommended-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: #f43f5e;
  color: #ffffff;
  font-size: 0.85rem;
  font-weight: 800;
  padding: 4px 18px;
  border: 2px solid var(--border-color);
  box-shadow: 2px 2px 0 var(--border-color);
  border-radius: 20px;
}

.pricing-title {
  font-size: 1.5rem;
  font-weight: 900;
  margin-bottom: 6px;
  color: var(--text-main);
}

.pricing-subtitle {
  font-size: 0.95rem;
  color: var(--text-muted);
  font-weight: 600;
}

.pricing-price-wrap {
  margin: 20px 0 10px;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.pricing-symbol {
  font-size: 1.4rem;
  font-weight: 800;
}

.pricing-amount {
  font-size: 3rem;
  font-weight: 900;
  line-height: 1;
  color: var(--text-main);
}

.pricing-period {
  font-size: 0.95rem;
  color: var(--text-muted);
  font-weight: 600;
}

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

.pricing-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  font-size: 0.95rem;
  color: var(--text-sub);
  font-weight: 600;
}

.pricing-features li .check-icon {
  color: #f43f5e;
  font-weight: 900;
  flex-shrink: 0;
}

.pricing-card.recommended .pricing-features li .check-icon {
  color: #10b981;
}

/* User Audience Section */
.audience-section {
  padding: 80px 0;
  background: var(--bg-secondary);
  border-top: 3px solid var(--border-color);
  border-bottom: 3px solid var(--border-color);
}

.audience-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.audience-card h4 {
  font-size: 1.25rem;
  font-weight: 800;
  color: #b45309;
  margin-bottom: 8px;
}

/* Tutorial Section */
.tutorials-preview-section {
  padding: 80px 0;
}

.tab-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-bottom: 36px;
  list-style: none;
}

.tab-btn {
  background: #ffffff;
  border: 2.5px solid var(--border-color);
  box-shadow: 2px 2px 0 var(--border-color);
  color: var(--text-main);
  padding: 10px 22px;
  font-size: 1.05rem;
  font-weight: 800;
  cursor: pointer;
  border-radius: 6px;
}

.tab-btn.active, .tab-btn:hover {
  background: var(--accent-green);
  color: #ffffff;
}

.tutorial-step-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.step-card {
  position: relative;
  background: #ffffff;
}

.step-number {
  width: 34px;
  height: 34px;
  background: var(--accent-yellow);
  color: #0f172a;
  font-weight: 900;
  border: 2.5px solid var(--border-color);
  box-shadow: 2px 2px 0 var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 12px;
  border-radius: 6px;
}

.step-card h4 {
  font-size: 1.2rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.code-box {
  background: #f8fafc;
  border: 2.5px solid var(--border-color);
  padding: 10px 14px;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: #047857;
  word-break: break-all;
  margin-top: 10px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-radius: 6px;
  font-weight: 600;
}

.copy-btn {
  background: #ffffff;
  border: 2px solid var(--border-color);
  color: var(--text-main);
  padding: 4px 12px;
  font-size: 0.85rem;
  font-weight: 800;
  cursor: pointer;
  border-radius: 4px;
}

.copy-btn:hover {
  background: var(--accent-yellow);
}

/* Reviews Section */
.reviews-section {
  padding: 80px 0;
  background: #ffffff;
  border-top: 3px solid var(--border-color);
  border-bottom: 3px solid var(--border-color);
}

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

.review-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background: #f8fafc;
}

.reviewer-info {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 16px;
  border-top: 1px dashed var(--border-subtle);
  padding-top: 14px;
}

.avatar-pixel {
  width: 42px;
  height: 42px;
  background: #e0f2fe;
  border: 2.5px solid var(--border-color);
  box-shadow: 2px 2px 0 var(--border-color);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  color: #0369a1;
}

.review-stars {
  color: #d97706;
  margin-bottom: 8px;
  font-size: 1.1rem;
}

/* FAQ Accordion */
.faq-section {
  padding: 80px 0;
}

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

.faq-item {
  background: #ffffff;
  border: 3px solid var(--border-color);
  box-shadow: 3px 3px 0 var(--border-color);
  border-radius: 8px;
  overflow: hidden;
}

.faq-question {
  padding: 18px 24px;
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-main);
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  user-select: none;
}

.faq-question:hover {
  color: #059669;
}

.faq-toggle-icon {
  font-size: 1.2rem;
  font-weight: 900;
  color: #059669;
  transition: transform 0.2s ease;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  background: #f8fafc;
  color: var(--text-sub);
  font-size: 1rem;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 400px;
  padding: 18px 24px;
  border-top: 2.5px solid var(--border-color);
}

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

/* Articles Section */
.articles-section {
  padding: 80px 0;
  background: #f1f5f9;
  border-top: 3px solid var(--border-color);
  border-bottom: 3px solid var(--border-color);
}

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

.article-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background: #ffffff;
}

.article-card-meta {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 10px;
  display: flex;
  gap: 12px;
  font-weight: 600;
}

.article-card h3 {
  font-size: 1.25rem;
  font-weight: 800;
  line-height: 1.4;
  margin-bottom: 12px;
  color: var(--text-main);
}

.article-card h3 a:hover {
  color: #059669;
}

.article-card p {
  color: var(--text-sub);
  font-size: 0.95rem;
  margin-bottom: 18px;
  line-height: 1.6;
}

/* Article Detail Page Layout */
.article-page {
  padding: 40px 0 80px;
}

.breadcrumb-nav {
  margin-bottom: 24px;
  font-size: 0.95rem;
  color: var(--text-muted);
  font-weight: 700;
}

.breadcrumb-nav a:hover {
  color: #059669;
}

.breadcrumb-sep {
  margin: 0 8px;
  color: var(--border-subtle);
}

.article-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 40px;
}

.article-main {
  background: #ffffff;
  border: 3px solid var(--border-color);
  box-shadow: 4px 4px 0 var(--border-color);
  padding: 36px;
  border-radius: 10px;
}

.article-header h1 {
  font-size: 2.2rem;
  font-weight: 900;
  line-height: 1.3;
  color: var(--text-main);
  margin-bottom: 16px;
}

.article-meta-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  padding-bottom: 20px;
  margin-bottom: 28px;
  border-bottom: 2px dashed var(--border-subtle);
  font-size: 0.9rem;
  color: var(--text-muted);
  font-weight: 600;
}

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

.article-content h2 {
  font-size: 1.65rem;
  font-weight: 800;
  color: var(--text-main);
  margin: 36px 0 16px;
  padding-bottom: 8px;
  border-bottom: 3px solid var(--border-color);
}

.article-content h3 {
  font-size: 1.3rem;
  font-weight: 800;
  color: #b45309;
  margin: 24px 0 12px;
}

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

.article-content ul, .article-content ol {
  margin: 0 0 20px 24px;
}

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

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  border: 3px solid var(--border-color);
}

.article-content th, .article-content td {
  padding: 12px 16px;
  border: 1.5px solid var(--border-subtle);
  text-align: left;
}

.article-content th {
  background: #f1f5f9;
  color: #047857;
  font-weight: 900;
}

.article-content tr:nth-child(even) {
  background: #f8fafc;
}

.article-callout {
  background: #ecfeff;
  border: 3px solid var(--border-color);
  border-left: 6px solid #06b6d4;
  padding: 18px 20px;
  margin: 24px 0;
  border-radius: 6px;
}

.article-callout.warning {
  background: #fffbeb;
  border-left-color: var(--accent-yellow);
}

.article-sidebar {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.toc-widget {
  position: sticky;
  top: 96px;
  background: #ffffff;
}

.toc-title {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 14px;
  color: #047857;
}

.toc-list {
  list-style: none;
  font-size: 0.95rem;
  font-weight: 600;
}

.toc-list li {
  margin-bottom: 8px;
}

.toc-list a {
  color: var(--text-sub);
}

.toc-list a:hover {
  color: #059669;
}

.cta-widget {
  background: #f0fdf4;
  border: 3px solid var(--border-color);
  box-shadow: 4px 4px 0 var(--border-color);
  padding: 24px;
  text-align: center;
  border-radius: 8px;
}

/* Footer Section */
.site-footer {
  background: #ffffff;
  border-top: 3px solid var(--border-color);
  padding: 60px 0 30px;
  margin-top: 60px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: 36px;
  margin-bottom: 40px;
}

.footer-brand p {
  color: var(--text-sub);
  font-size: 0.95rem;
  margin-top: 12px;
  line-height: 1.6;
}

.footer-col h4 {
  font-size: 1.15rem;
  font-weight: 800;
  color: #b45309;
  margin-bottom: 16px;
}

.footer-links {
  list-style: none;
  font-size: 0.95rem;
  font-weight: 600;
}

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

.footer-links a {
  color: var(--text-sub);
}

.footer-links a:hover {
  color: #059669;
}

.footer-bottom {
  border-top: 2px dashed var(--border-subtle);
  padding-top: 24px;
  text-align: center;
  font-size: 0.9rem;
  color: var(--text-muted);
  font-weight: 700;
}

/* Mobile Responsive */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }
  .article-layout {
    grid-template-columns: 1fr;
  }
  .toc-widget {
    position: static;
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .mobile-toggle {
    display: block;
  }
  .nav-menu {
    position: absolute;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background: #ffffff;
    border-bottom: 3px solid var(--border-color);
    flex-direction: column;
    padding: 20px;
    gap: 16px;
    display: none;
  }
  .nav-menu.show {
    display: flex;
  }
  .hero-text h1 {
    font-size: 2rem;
  }
  .section-title {
    font-size: 1.7rem;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
}