/* ==========================================================================
   一分机场官网 1fenjichang.homes - Neo-Brutalist High Energy Design System
   ========================================================================== */

:root {
  --bg-teal: #22c1a2;
  --bg-teal-light: #3dd8b9;
  --bg-teal-dark: #19987f;
  
  --color-coral: #ff6b6b;
  --color-coral-dark: #e04848;
  --color-yellow: #fed136;
  --color-yellow-light: #ffea79;
  --color-cyan: #26c6da;
  --color-emerald: #245d3e;
  --color-emerald-dark: #1a452d;
  --color-dark: #121826;
  --color-black: #000000;
  --color-white: #ffffff;
  --color-offwhite: #faf9f6;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-600: #4b5563;
  --color-gray-800: #1f2937;
  
  --border-thick: 3px solid #000000;
  --border-medium: 2px solid #000000;
  --border-light: 1.5px solid #000000;
  
  --shadow-sm: 3px 3px 0px #000000;
  --shadow-md: 5px 5px 0px #000000;
  --shadow-lg: 8px 8px 0px #000000;
  --shadow-coral: 6px 6px 0px #ff6b6b;
  --shadow-yellow: 6px 6px 0px #fed136;
  
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-pill: 9999px;
  
  --font-sans: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "Fira Code", monospace;
  
  --transition: all 0.18s cubic-bezier(0.16, 1, 0.3, 1);
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-teal);
  background-image: radial-gradient(rgba(0, 0, 0, 0.08) 1.5px, transparent 1.5px),
                    radial-gradient(rgba(255, 255, 255, 0.15) 1.5px, transparent 1.5px);
  background-size: 24px 24px;
  background-position: 0 0, 12px 12px;
  color: var(--color-dark);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
}

a {
  text-decoration: none;
  color: inherit;
}

ul {
  list-style: none;
}

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

/* Container */
.container {
  width: 100%;
  max-width: 1240px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* ==========================================================================
   Dynamic Ticker Marquee Bar
   ========================================================================== */
.ticker-bar {
  background: var(--color-yellow);
  color: var(--color-black);
  border-bottom: var(--border-thick);
  padding: 10px 0;
  font-weight: 800;
  font-size: 0.95rem;
  letter-spacing: 0.5px;
  overflow: hidden;
  white-space: nowrap;
  display: flex;
}

.ticker-content {
  display: inline-block;
  animation: marquee 28s linear infinite;
}

.ticker-content span {
  margin: 0 24px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

@keyframes marquee {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.header-wrapper {
  position: sticky;
  top: 16px;
  z-index: 100;
  margin-bottom: 24px;
}

.navbar {
  background: var(--color-white);
  border: var(--border-thick);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--color-black);
}

.brand-badge-box {
  display: flex;
  gap: 4px;
  background: var(--color-black);
  padding: 4px;
  border-radius: var(--radius-sm);
}

.brand-badge-box span {
  width: 12px;
  height: 12px;
  border-radius: 2px;
  display: block;
}
.brand-badge-box span:nth-child(1) { background: var(--color-coral); }
.brand-badge-box span:nth-child(2) { background: var(--color-yellow); }
.brand-badge-box span:nth-child(3) { background: var(--bg-teal); }

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-size: 1.35rem;
  font-weight: 900;
  letter-spacing: -0.5px;
  line-height: 1.1;
  color: var(--color-black);
}

.brand-domain {
  font-size: 0.72rem;
  font-family: var(--font-mono);
  background: var(--color-yellow);
  padding: 1px 6px;
  border-radius: 4px;
  border: 1px solid #000;
  font-weight: 700;
  display: inline-block;
  margin-top: 2px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav-item {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-black);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.nav-item:hover {
  background: var(--color-yellow);
  box-shadow: 2px 2px 0 #000;
  transform: translate(-1px, -1px);
}

.nav-cta {
  background: var(--color-coral);
  color: var(--color-white);
  border: var(--border-medium);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  padding: 8px 18px;
  font-weight: 800;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition);
}

.nav-cta:hover {
  background: var(--color-coral-dark);
  box-shadow: 1px 1px 0 #000;
  transform: translate(2px, 2px);
  color: var(--color-white);
}

.mobile-menu-btn {
  display: none;
  background: var(--color-yellow);
  border: var(--border-medium);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  font-size: 1.2rem;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
}

/* ==========================================================================
   Hero Section - Neo Brutalism Figure 1 Style
   ========================================================================== */
.hero {
  padding: 40px 0 60px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 36px;
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--color-white);
  border: var(--border-thick);
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-sm);
  padding: 6px 16px;
  font-weight: 800;
  font-size: 0.88rem;
  width: fit-content;
}

.status-indicator {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.35);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.hero-title {
  font-size: 3.2rem;
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -1px;
  color: var(--color-black);
}

.hero-title .highlight-yellow {
  background: var(--color-yellow);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  border: var(--border-medium);
  box-shadow: 3px 3px 0 #000;
  display: inline-block;
  transform: rotate(-1deg);
}

.hero-title .highlight-coral {
  color: var(--color-coral);
  text-shadow: 2px 2px 0 #000;
}

.hero-desc {
  font-size: 1.18rem;
  font-weight: 600;
  color: #0b221c;
  line-height: 1.7;
}

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

.btn-primary {
  background: var(--color-yellow);
  color: var(--color-black);
  border: var(--border-thick);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  padding: 14px 32px;
  font-size: 1.15rem;
  font-weight: 900;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.btn-primary:hover {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 #000;
  background: #fcc419;
}

.btn-secondary {
  background: var(--color-white);
  color: var(--color-black);
  border: var(--border-thick);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  padding: 14px 28px;
  font-size: 1.1rem;
  font-weight: 800;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-secondary:hover {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 #000;
  background: var(--color-gray-100);
}

.hero-features-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 10px;
}

.hero-feature-pill {
  background: var(--color-white);
  border: var(--border-medium);
  box-shadow: var(--shadow-sm);
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  font-size: 0.88rem;
  font-weight: 800;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* Playful Neo Brutalist Card from Figure 1 */
.playful-showcase {
  position: relative;
}

.playful-card {
  background: var(--color-white);
  border: var(--border-thick);
  border-radius: 4px;
  box-shadow: 10px 10px 0px var(--color-coral);
  padding: 32px 28px;
  position: relative;
  transition: var(--transition);
}

.playful-card:hover {
  transform: translate(-3px, -3px);
  box-shadow: 14px 14px 0px var(--color-coral);
}

.playful-color-blocks {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
}

.playful-block {
  width: 44px;
  height: 44px;
  border: var(--border-thick);
  border-radius: 4px;
  box-shadow: 3px 3px 0 #000;
}
.playful-block.pink { background: var(--color-coral); }
.playful-block.yellow { background: var(--color-yellow); }
.playful-block.teal { background: var(--bg-teal); }

.playful-title {
  font-size: 1.85rem;
  font-weight: 900;
  letter-spacing: 0.5px;
  line-height: 1.1;
  color: var(--color-black);
}

.playful-subtitle {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-gray-600);
  margin-top: 6px;
  margin-bottom: 24px;
}

.btn-fun {
  background: var(--color-yellow);
  color: var(--color-black);
  border: var(--border-thick);
  border-radius: 4px;
  box-shadow: 4px 4px 0 #000;
  padding: 10px 28px;
  font-size: 1.1rem;
  font-weight: 900;
  cursor: pointer;
  display: inline-block;
  transition: var(--transition);
}

.btn-fun:hover {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 #000;
}

.bottom-stripe {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 10px;
  display: flex;
}
.stripe-1 { flex: 1; background: #000; }
.stripe-2 { flex: 1; background: #fff; }
.stripe-3 { flex: 1; background: var(--color-coral); }

/* Floating Decorative Stickers */
.floating-sticker {
  position: absolute;
  padding: 8px 14px;
  border: var(--border-medium);
  font-weight: 900;
  font-size: 0.85rem;
  box-shadow: var(--shadow-sm);
  z-index: 2;
  animation: float 4s ease-in-out infinite;
}

.sticker-1 {
  top: -20px;
  right: 20px;
  background: var(--color-yellow);
  transform: rotate(6deg);
  border-radius: var(--radius-sm);
}

.sticker-2 {
  bottom: -20px;
  left: 10px;
  background: var(--color-white);
  transform: rotate(-6deg);
  border-radius: var(--radius-sm);
  animation-delay: 1.5s;
}

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(6deg); }
  50% { transform: translateY(-8px) rotate(4deg); }
}

/* ==========================================================================
   Section Common Styles
   ========================================================================== */
.section {
  padding: 60px 0;
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 48px;
}

.section-tag {
  display: inline-block;
  background: var(--color-yellow);
  color: var(--color-black);
  border: var(--border-medium);
  box-shadow: 3px 3px 0 #000;
  border-radius: var(--radius-pill);
  padding: 4px 16px;
  font-weight: 900;
  font-size: 0.9rem;
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 900;
  letter-spacing: -0.5px;
  color: var(--color-black);
  line-height: 1.2;
}

.section-subtitle {
  font-size: 1.1rem;
  color: #12372c;
  font-weight: 600;
  margin-top: 10px;
}

/* ==========================================================================
   Official Portal Section (官网入口 / 状态检查)
   ========================================================================== */
.portal-card {
  background: var(--color-white);
  border: var(--border-thick);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 36px;
  margin-bottom: 40px;
}

.portal-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: center;
}

.portal-info h3 {
  font-size: 1.8rem;
  font-weight: 900;
  margin-bottom: 12px;
}

.portal-info p {
  font-size: 1.05rem;
  color: var(--color-gray-600);
  margin-bottom: 20px;
}

.mirror-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.mirror-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--color-gray-100);
  border: var(--border-medium);
  border-radius: var(--radius-md);
  padding: 12px 18px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.mirror-item:hover {
  background: var(--color-white);
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0 #000;
}

.mirror-name {
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 8px;
}

.mirror-badge {
  font-size: 0.75rem;
  background: #10b981;
  color: #fff;
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  font-weight: 800;
}

.mirror-ping {
  font-family: var(--font-mono);
  font-weight: 800;
  color: #047857;
  font-size: 0.9rem;
}

.mirror-btn {
  background: var(--color-coral);
  color: #fff;
  border: var(--border-medium);
  border-radius: var(--radius-sm);
  padding: 6px 14px;
  font-weight: 800;
  font-size: 0.88rem;
  box-shadow: 2px 2px 0 #000;
  transition: var(--transition);
}

.mirror-btn:hover {
  transform: translate(1px, 1px);
  box-shadow: 1px 1px 0 #000;
}

/* Network Speed Simulator Widget */
.speed-box {
  background: var(--color-dark);
  color: var(--color-white);
  border: var(--border-thick);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-md);
}

.speed-box-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
  padding-bottom: 12px;
  margin-bottom: 16px;
}

.speed-stat-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  text-align: center;
}

.speed-stat-card {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 12px 8px;
  border-radius: var(--radius-sm);
}

.speed-stat-value {
  font-size: 1.5rem;
  font-weight: 900;
  font-family: var(--font-mono);
  color: var(--color-yellow);
}

.speed-stat-label {
  font-size: 0.75rem;
  color: #9ca3af;
  margin-top: 4px;
}

/* ==========================================================================
   Pricing Section - Exactly matching Figure 2
   ========================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

.pricing-card {
  background: var(--color-white);
  border: var(--border-thick);
  border-radius: 20px;
  box-shadow: var(--shadow-lg);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition);
}

.pricing-card:hover {
  transform: translateY(-8px);
  box-shadow: 12px 12px 0px #000;
}

/* Featured / Middle Card - Forest Green from Figure 2 */
.pricing-card.featured {
  background: var(--color-emerald);
  color: var(--color-white);
  border-color: #000;
  box-shadow: 10px 10px 0px #000;
  transform: scale(1.03);
}

.pricing-card.featured:hover {
  transform: scale(1.03) translateY(-8px);
  box-shadow: 14px 14px 0px #000;
}

.pricing-card.featured .pricing-title,
.pricing-card.featured .feature-val,
.pricing-card.featured .feature-lbl {
  color: var(--color-white);
}

.pricing-card.featured .pricing-meta-row {
  border-color: rgba(255, 255, 255, 0.15);
}

.pricing-card.featured .pricing-price {
  color: var(--color-yellow);
}

.pricing-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-yellow);
  color: var(--color-black);
  border: var(--border-medium);
  border-radius: var(--radius-pill);
  padding: 4px 18px;
  font-weight: 900;
  font-size: 0.85rem;
  box-shadow: 3px 3px 0 #000;
}

.pricing-header {
  margin-bottom: 20px;
}

.pricing-title {
  font-size: 1.55rem;
  font-weight: 900;
  margin-bottom: 6px;
  color: var(--color-black);
}

.pricing-features-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 24px;
  font-size: 0.92rem;
  flex-grow: 1;
}

.pricing-meta-row {
  display: flex;
  flex-direction: column;
  border-bottom: 1px dashed var(--color-gray-200);
  padding-bottom: 6px;
}

.feature-lbl {
  font-size: 0.78rem;
  color: var(--color-gray-600);
  font-weight: 700;
}

.feature-val {
  font-weight: 800;
  color: var(--color-dark);
  margin-top: 1px;
}

.pricing-price-box {
  margin-top: 20px;
  margin-bottom: 20px;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.currency {
  font-size: 1.35rem;
  font-weight: 900;
}

.pricing-price {
  font-size: 2.8rem;
  font-weight: 900;
  line-height: 1;
  font-family: var(--font-mono);
  color: #107c41;
}

.pricing-unit {
  font-size: 0.95rem;
  font-weight: 800;
  color: var(--color-gray-600);
}

.pricing-card.featured .pricing-unit {
  color: #d1fae5;
}

.pricing-tags-row {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.82rem;
  font-weight: 800;
  margin-bottom: 20px;
  color: var(--color-gray-600);
}

.pricing-card.featured .pricing-tags-row {
  color: #d1fae5;
}

.btn-pricing-buy {
  background: #111e38;
  color: var(--color-white);
  border: var(--border-medium);
  border-radius: var(--radius-sm);
  padding: 14px 20px;
  font-weight: 900;
  font-size: 1.1rem;
  text-align: center;
  box-shadow: 4px 4px 0 #000;
  cursor: pointer;
  transition: var(--transition);
  display: block;
}

.btn-pricing-buy:hover {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 #000;
  background: var(--color-coral);
  color: #fff;
}

.pricing-card.featured .btn-pricing-buy {
  background: #0f172a;
}

.pricing-card.featured .btn-pricing-buy:hover {
  background: var(--color-yellow);
  color: #000;
}

/* ==========================================================================
   Clients Section (客户端)
   ========================================================================== */
.client-tabs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.client-card {
  background: var(--color-white);
  border: var(--border-thick);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
}

.client-card:hover {
  transform: translate(-3px, -3px);
  box-shadow: 8px 8px 0px #000;
}

.client-icon {
  width: 52px;
  height: 52px;
  border: var(--border-medium);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  margin-bottom: 16px;
  box-shadow: 3px 3px 0 #000;
}

.client-card:nth-child(1) .client-icon { background: #fee2e2; }
.client-card:nth-child(2) .client-icon { background: #fef3c7; }
.client-card:nth-child(3) .client-icon { background: #e0e7ff; }
.client-card:nth-child(4) .client-icon { background: #d1fae5; }

.client-name {
  font-size: 1.25rem;
  font-weight: 900;
  margin-bottom: 6px;
}

.client-platform {
  font-size: 0.8rem;
  font-family: var(--font-mono);
  background: var(--color-yellow);
  border: 1px solid #000;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  display: inline-block;
  margin-bottom: 12px;
  width: fit-content;
  font-weight: 800;
}

.client-desc {
  font-size: 0.88rem;
  color: var(--color-gray-600);
  margin-bottom: 16px;
  flex-grow: 1;
}

.client-links {
  display: flex;
  gap: 8px;
}

.client-btn {
  flex: 1;
  text-align: center;
  background: var(--color-white);
  border: var(--border-medium);
  border-radius: var(--radius-sm);
  padding: 8px 4px;
  font-size: 0.82rem;
  font-weight: 800;
  box-shadow: 2px 2px 0 #000;
  transition: var(--transition);
}

.client-btn:hover {
  background: var(--color-yellow);
  transform: translate(1px, 1px);
  box-shadow: 1px 1px 0 #000;
}

/* ==========================================================================
   Knowledge Base & AI Acceleration (知识库 & AI工具)
   ========================================================================== */
.two-col-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.feature-box {
  background: var(--color-white);
  border: var(--border-thick);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 32px;
}

.feature-box-title {
  font-size: 1.6rem;
  font-weight: 900;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.knowledge-item {
  display: flex;
  gap: 16px;
  border-bottom: 1px solid var(--color-gray-200);
  padding: 14px 0;
}

.knowledge-step {
  width: 32px;
  height: 32px;
  border: var(--border-medium);
  border-radius: 50%;
  background: var(--color-yellow);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  flex-shrink: 0;
  box-shadow: 2px 2px 0 #000;
}

.ai-badge-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 16px;
}

.ai-tool-pill {
  background: var(--color-gray-100);
  border: var(--border-medium);
  border-radius: var(--radius-md);
  padding: 12px;
  text-align: center;
  font-weight: 800;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.ai-tool-pill:hover {
  background: var(--color-yellow);
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0 #000;
}

/* ==========================================================================
   FAQ Section (机场FAQ)
   ========================================================================== */
.faq-list {
  max-width: 880px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--color-white);
  border: var(--border-thick);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: var(--transition);
}

.faq-item:hover {
  box-shadow: 6px 6px 0 #000;
}

.faq-question {
  padding: 20px 24px;
  font-size: 1.15rem;
  font-weight: 900;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  background: var(--color-white);
  user-select: none;
}

.faq-icon {
  width: 28px;
  height: 28px;
  border: var(--border-medium);
  border-radius: var(--radius-sm);
  background: var(--color-yellow);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 1.1rem;
  transition: transform 0.2s ease;
  box-shadow: 2px 2px 0 #000;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
  background: var(--color-coral);
  color: #fff;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease-out, padding 0.3s ease;
  background: var(--color-offwhite);
  padding: 0 24px;
  font-size: 0.98rem;
  line-height: 1.7;
  color: var(--color-gray-800);
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding: 16px 24px 24px;
  border-top: 2px dashed #000;
}

/* ==========================================================================
   9 Articles Section (精选文章 / SEO Matrix)
   ========================================================================== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.article-card {
  background: var(--color-white);
  border: var(--border-thick);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  position: relative;
}

.article-card:hover {
  transform: translate(-4px, -4px);
  box-shadow: 8px 8px 0px #000;
}

.article-tag {
  background: var(--color-yellow);
  border: var(--border-medium);
  border-radius: var(--radius-pill);
  padding: 2px 10px;
  font-size: 0.75rem;
  font-weight: 900;
  width: fit-content;
  box-shadow: 2px 2px 0 #000;
  margin-bottom: 12px;
}

.article-title {
  font-size: 1.15rem;
  font-weight: 900;
  line-height: 1.4;
  margin-bottom: 12px;
  color: var(--color-black);
}

.article-title a:hover {
  color: var(--color-coral);
  text-decoration: underline;
}

.article-excerpt {
  font-size: 0.88rem;
  color: var(--color-gray-600);
  line-height: 1.6;
  margin-bottom: 18px;
  flex-grow: 1;
}

.article-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px dashed var(--color-gray-200);
  padding-top: 12px;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-gray-600);
}

.article-read-more {
  color: var(--color-black);
  font-weight: 900;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.article-read-more:hover {
  color: var(--color-coral);
}

/* ==========================================================================
   Article Detail Page Layout & Typography
   ========================================================================== */
.article-page {
  background: var(--color-offwhite);
  border: var(--border-thick);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 48px;
  margin: 24px auto 60px;
  max-width: 960px;
}

.article-page-header {
  border-bottom: var(--border-thick);
  padding-bottom: 24px;
  margin-bottom: 32px;
}

.article-page-title {
  font-size: 2.4rem;
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: -0.5px;
  margin: 16px 0;
}

.article-meta-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--color-gray-600);
}

.article-content {
  font-size: 1.05rem;
  line-height: 1.85;
  color: #1f2937;
}

.article-content h2 {
  font-size: 1.65rem;
  font-weight: 900;
  margin-top: 36px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid #000;
  display: flex;
  align-items: center;
  gap: 10px;
}

.article-content h3 {
  font-size: 1.3rem;
  font-weight: 800;
  margin-top: 24px;
  margin-bottom: 12px;
}

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

.article-content ul, .article-content ol {
  margin-bottom: 20px;
  padding-left: 24px;
}

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

.article-callout {
  background: #fef9c3;
  border: var(--border-thick);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  padding: 20px 24px;
  margin: 28px 0;
  font-weight: 600;
}

.article-callout.alert {
  background: #fee2e2;
  border-color: #000;
}

.article-callout.tip {
  background: #dcfce7;
  border-color: #000;
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  border: var(--border-thick);
  box-shadow: var(--shadow-sm);
  background: var(--color-white);
}

.article-table th {
  background: var(--color-yellow);
  border: var(--border-medium);
  padding: 12px 16px;
  text-align: left;
  font-weight: 900;
}

.article-table td {
  border: var(--border-medium);
  padding: 12px 16px;
}

/* Article CTA Box */
.article-cta-box {
  background: var(--color-yellow);
  border: var(--border-thick);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 32px;
  text-align: center;
  margin: 40px 0;
}

.article-cta-box h3 {
  font-size: 1.8rem;
  font-weight: 900;
  margin-bottom: 8px;
}

.article-cta-box p {
  font-weight: 700;
  margin-bottom: 20px;
}

/* Internal Linking Widget */
.related-articles-box {
  background: var(--color-white);
  border: var(--border-thick);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  padding: 24px;
  margin-top: 40px;
}

.related-articles-box h4 {
  font-size: 1.3rem;
  font-weight: 900;
  margin-bottom: 16px;
  border-bottom: 2px dashed #000;
  padding-bottom: 8px;
}

.related-links-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.related-link-item {
  background: var(--color-gray-100);
  border: var(--border-medium);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: 0.9rem;
  font-weight: 800;
  box-shadow: 2px 2px 0 #000;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 8px;
}

.related-link-item:hover {
  background: var(--color-yellow);
  transform: translate(-1px, -1px);
  box-shadow: 3px 3px 0 #000;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
  background: var(--color-white);
  border-top: var(--border-thick);
  padding: 50px 0 30px;
  margin-top: 60px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 36px;
  margin-bottom: 40px;
}

.footer-brand-title {
  font-size: 1.4rem;
  font-weight: 900;
  margin-bottom: 12px;
}

.footer-desc {
  font-size: 0.9rem;
  color: var(--color-gray-600);
  line-height: 1.6;
}

.footer-col h4 {
  font-size: 1.05rem;
  font-weight: 900;
  margin-bottom: 16px;
  border-bottom: 2px solid #000;
  padding-bottom: 6px;
  display: inline-block;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 0.9rem;
  font-weight: 700;
}

.footer-links a:hover {
  color: var(--color-coral);
  text-decoration: underline;
}

.footer-bottom {
  border-top: var(--border-medium);
  padding-top: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-gray-600);
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin: 0 auto;
  }
  .pricing-card.featured {
    transform: none;
  }
  .pricing-card.featured:hover {
    transform: translateY(-8px);
  }
  .client-tabs {
    grid-template-columns: repeat(2, 1fr);
  }
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2.2rem;
  }
  .nav-links {
    display: none;
    position: absolute;
    top: 70px;
    left: 20px;
    right: 20px;
    background: var(--color-white);
    border: var(--border-thick);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    flex-direction: column;
    padding: 20px;
  }
  .nav-links.active {
    display: flex;
  }
  .mobile-menu-btn {
    display: block;
  }
  .portal-grid,
  .two-col-grid,
  .related-links-grid {
    grid-template-columns: 1fr;
  }
  .articles-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
  .article-page {
    padding: 24px 18px;
  }
  .article-page-title {
    font-size: 1.8rem;
  }
}