/* ==========================================================================
   SSR Dog - Swiss International Kinetic Design System
   Colors: Midnight Forest Emerald (#061412), Crisp Paper White (#F4F5F6), Neon Chartreuse (#D4FF00)
   Zero small icons, Ultra-modern editorial typography, Structural brutalist grid
   ========================================================================== */

:root {
  /* Default: Light Mode (Crisp Paper White with Midnight Emerald Accents) */
  --bg-primary: #F4F5F6;
  --bg-secondary: #E9ECEE;
  --bg-surface: #FFFFFF;
  --bg-surface-elevated: #F8FAF9;
  --bg-card: #FFFFFF;
  --bg-card-hover: #F8FAF9;
  --text-primary: #061412;
  --text-secondary: #2C3E3B;
  --text-muted: #647B76;
  --border-color: rgba(6, 20, 18, 0.12);
  --border-strong: rgba(6, 20, 18, 0.28);
  --accent-neon: #185E4E;
  --accent-chartreuse: #B6E500;
  --accent-contrast: #061412;
  --badge-bg: rgba(6, 20, 18, 0.06);
  --badge-border: rgba(6, 20, 18, 0.15);
  --nav-bg: rgba(244, 245, 246, 0.92);
  --marquee-bg: #061412;
  --marquee-text: #D4FF00;
  --card-shadow: 0 4px 16px rgba(6, 20, 18, 0.05);
  --card-shadow-hover: 0 20px 32px rgba(6, 20, 18, 0.12);
  --transition-speed: 0.25s;
  --mono-font: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;
}

[data-theme="dark"] {
  /* Dark Mode: Midnight Forest Emerald & Neon Chartreuse */
  --bg-primary: #061412;
  --bg-secondary: #0A1C1A;
  --bg-surface: #0E2421;
  --bg-surface-elevated: #132E2A;
  --bg-card: #0A1C1A;
  --bg-card-hover: #102B27;
  --text-primary: #F4F5F6;
  --text-secondary: #A3B8B4;
  --text-muted: #5C7571;
  --border-color: rgba(212, 255, 0, 0.14);
  --border-strong: rgba(212, 255, 0, 0.35);
  --accent-neon: #D4FF00;
  --accent-chartreuse: #D4FF00;
  --accent-contrast: #061412;
  --badge-bg: rgba(212, 255, 0, 0.08);
  --badge-border: rgba(212, 255, 0, 0.25);
  --nav-bg: rgba(6, 20, 18, 0.92);
  --marquee-bg: #D4FF00;
  --marquee-text: #061412;
  --card-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
  --card-shadow-hover: 0 20px 40px rgba(212, 255, 0, 0.12);
}

/* ==========================================================================
   Base Reset & Swiss Editorial Typography
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "Arial", "PingFang SC", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
  overflow-x: hidden;
  letter-spacing: -0.01em;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease, opacity 0.2s ease;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  outline: none;
  background: none;
}

.mono-tag {
  font-family: var(--mono-font);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-neon);
  font-weight: 600;
}

.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ==========================================================================
   Header & Nav (Swiss Structural Grid)
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: var(--nav-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  transition: background-color var(--transition-speed) ease;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.32rem;
  font-weight: 900;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  text-transform: uppercase;
}

.brand-pill {
  background: var(--accent-neon);
  color: var(--accent-contrast);
  font-family: var(--mono-font);
  font-size: 0.72rem;
  font-weight: 800;
  padding: 3px 7px;
  border-radius: 4px;
  letter-spacing: 0.05em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
}

.nav-link {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-secondary);
  position: relative;
  padding: 6px 2px;
  letter-spacing: -0.01em;
  transition: color 0.2s ease;
}

.nav-link:hover, .nav-link.active {
  color: var(--accent-neon);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-neon);
  transition: width 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* ==========================================================================
   Refined Transparent Day/Night Switcher Button
   ========================================================================== */
.theme-toggle-btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 8px;
  background: rgba(148, 163, 184, 0.08);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.theme-toggle-btn:hover {
  background: rgba(148, 163, 184, 0.18);
  border-color: var(--accent-neon);
  transform: translateY(-1px);
}

.theme-icon {
  width: 18px;
  height: 18px;
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s ease;
}

.sun-icon {
  opacity: 1;
  transform: rotate(0deg);
}

.moon-icon {
  position: absolute;
  opacity: 0;
  transform: rotate(-90deg) scale(0.6);
}

[data-theme="dark"] .sun-icon {
  opacity: 0;
  transform: rotate(90deg) scale(0.6);
}

[data-theme="dark"] .moon-icon {
  opacity: 1;
  transform: rotate(0deg);
  color: var(--accent-neon);
}

/* Mobile Nav Toggle */
.mobile-menu-btn {
  display: none;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
}

/* ==========================================================================
   Buttons & CTA (Swiss Kinetic Styling)
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 26px;
  border-radius: 6px;
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  text-align: center;
  white-space: nowrap;
  transition: all 0.22s cubic-bezier(0.16, 1, 0.3, 1);
  min-height: 46px;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--accent-neon);
  color: var(--accent-contrast) !important;
  border: 1px solid transparent;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.1);
}

.btn-primary:hover {
  transform: translateY(-2px);
  filter: brightness(1.08);
  box-shadow: 0 8px 24px rgba(212, 255, 0, 0.25);
}

.btn-secondary {
  background: var(--bg-surface);
  color: var(--text-primary) !important;
  border: 1px solid var(--border-strong);
}

.btn-secondary:hover {
  border-color: var(--accent-neon);
  color: var(--accent-neon) !important;
  transform: translateY(-2px);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.86rem;
  min-height: 38px;
}

.btn-lg {
  padding: 15px 34px;
  font-size: 1.05rem;
  min-height: 52px;
  border-radius: 8px;
}

.btn-block {
  width: 100%;
}

/* ==========================================================================
   Kinetic Marquee Banner (Continuous Accelerating Ribbon)
   ========================================================================== */
.marquee-strip {
  width: 100%;
  background: var(--marquee-bg);
  color: var(--marquee-text);
  overflow: hidden;
  white-space: nowrap;
  padding: 10px 0;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  user-select: none;
}

.marquee-content {
  display: inline-block;
  font-family: var(--mono-font);
  font-weight: 900;
  font-size: 1.05rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  animation: marquee-slide 28s linear infinite;
  will-change: transform;
}

.marquee-content span {
  padding: 0 24px;
}

@keyframes marquee-slide {
  from { transform: translateX(0%); }
  to { transform: translateX(-50%); }
}

/* ==========================================================================
   Hero Section: Editorial Grid + Live Speed Slider
   ========================================================================== */
.hero-section {
  padding: 64px 0 60px;
  position: relative;
  border-bottom: 1px solid var(--border-color);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}

.hero-editorial-left {
  display: flex;
  flex-direction: column;
}

.hero-status-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: var(--badge-bg);
  border: 1px solid var(--badge-border);
  border-radius: 4px;
  width: fit-content;
  margin-bottom: 24px;
}

.status-indicator-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--accent-neon);
  box-shadow: 0 0 8px var(--accent-neon);
}

.hero-headline {
  font-size: 3.4rem;
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.04em;
  color: var(--text-primary);
  margin-bottom: 20px;
  text-transform: uppercase;
}

.hero-headline .brand-highlight {
  color: var(--accent-neon);
  display: inline-block;
}

.hero-intro-text {
  font-size: 1.18rem;
  line-height: 1.68;
  color: var(--text-secondary);
  margin-bottom: 36px;
  max-width: 600px;
}

.hero-cta-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 32px;
}

.hero-meta-row {
  display: flex;
  gap: 24px;
  padding-top: 24px;
  border-top: 1px dashed var(--border-color);
  font-family: var(--mono-font);
  font-size: 0.82rem;
  color: var(--text-muted);
}

.meta-spec-item strong {
  color: var(--text-primary);
  margin-right: 4px;
}

/* ==========================================================================
   Interactive Live Transit Speed Slider Card
   ========================================================================== */
.speed-simulator-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: 14px;
  padding: 32px;
  box-shadow: var(--card-shadow);
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.2s ease;
  position: relative;
}

.speed-simulator-card:hover {
  box-shadow: var(--card-shadow-hover);
}

.simulator-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
}

.simulator-title-box h3 {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 4px;
  letter-spacing: -0.02em;
}

.simulator-title-box p {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.live-badge {
  background: var(--accent-neon);
  color: var(--accent-contrast);
  font-family: var(--mono-font);
  font-size: 0.72rem;
  font-weight: 800;
  padding: 4px 8px;
  border-radius: 4px;
}

/* Slider Controls */
.slider-control-group {
  margin-bottom: 28px;
}

.slider-labels {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 12px;
}

.slider-val-display {
  font-size: 2.2rem;
  font-weight: 900;
  font-family: var(--mono-font);
  color: var(--accent-neon);
  line-height: 1;
}

.transit-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 8px;
  border-radius: 4px;
  background: var(--bg-secondary);
  outline: none;
  cursor: pointer;
  transition: background 0.2s ease;
}

.transit-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--accent-neon);
  border: 3px solid var(--bg-surface);
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
  transition: transform 0.15s ease;
}

.transit-slider::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

/* Dynamic Live Metrics Display */
.metric-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 20px;
}

.metric-cell {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 14px;
  text-align: center;
}

.metric-cell-label {
  font-size: 0.74rem;
  color: var(--text-muted);
  font-family: var(--mono-font);
  margin-bottom: 4px;
  text-transform: uppercase;
}

.metric-cell-value {
  font-size: 1.25rem;
  font-weight: 800;
  font-family: var(--mono-font);
  color: var(--text-primary);
}

/* Latency Morph Bar */
.latency-bar-container {
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px solid var(--border-color);
}

.latency-bar-header {
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
  font-family: var(--mono-font);
  color: var(--text-muted);
  margin-bottom: 8px;
}

.latency-bar-track {
  width: 100%;
  height: 8px;
  background: var(--bg-secondary);
  border-radius: 4px;
  overflow: hidden;
  position: relative;
}

.latency-bar-fill {
  height: 100%;
  background: var(--accent-neon);
  width: 24%;
  transition: width 0.2s cubic-bezier(0.16, 1, 0.3, 1), background-color 0.2s ease;
  border-radius: 4px;
}

/* ==========================================================================
   Section Headers (Swiss Structural Grid)
   ========================================================================== */
.section {
  padding: 88px 0;
  position: relative;
}

.section-alt {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.section-header {
  margin-bottom: 56px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.section-header-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  border-bottom: 1px solid var(--border-strong);
  padding-bottom: 24px;
}

.section-title {
  font-size: 2.45rem;
  font-weight: 900;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  line-height: 1.15;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 620px;
}

/* ==========================================================================
   3 Core Advantages: Swiss Structural Editorial Cards
   (Zero small generic icons, large structural index markers)
   ========================================================================== */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.advantage-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 36px 30px;
  display: flex;
  flex-direction: column;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: var(--card-shadow);
  position: relative;
}

.advantage-card:hover {
  transform: translateY(-6px);
  border-color: var(--accent-neon);
  box-shadow: var(--card-shadow-hover);
}

.card-num-marker {
  font-family: var(--mono-font);
  font-size: 2rem;
  font-weight: 900;
  color: var(--accent-neon);
  line-height: 1;
  margin-bottom: 18px;
}

.advantage-card h3 {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 14px;
  letter-spacing: -0.02em;
}

.advantage-card p {
  font-size: 0.96rem;
  line-height: 1.7;
  color: var(--text-secondary);
  flex-grow: 1;
  margin-bottom: 24px;
}

.card-spec-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: 18px;
  border-top: 1px solid var(--border-color);
}

.spec-badge {
  font-family: var(--mono-font);
  font-size: 0.74rem;
  font-weight: 700;
  padding: 4px 10px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  color: var(--text-secondary);
}

/* ==========================================================================
   Showcase Cards: Streaming & AI Support
   ========================================================================== */
.showcase-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.showcase-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 38px 34px;
  box-shadow: var(--card-shadow);
  display: flex;
  flex-direction: column;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.showcase-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
  box-shadow: var(--card-shadow-hover);
}

.showcase-header {
  margin-bottom: 28px;
}

.showcase-header h3 {
  font-size: 1.6rem;
  font-weight: 900;
  color: var(--text-primary);
  margin: 6px 0 8px;
  letter-spacing: -0.02em;
}

.showcase-header p {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.app-badge-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 28px;
}

.app-badge-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  transition: all 0.2s ease;
}

.app-badge-box:hover {
  background: var(--bg-surface);
  border-color: var(--accent-neon);
  transform: translateY(-2px);
}

.app-badge-title {
  font-weight: 800;
  font-size: 0.94rem;
  color: var(--text-primary);
}

.app-badge-meta {
  font-family: var(--mono-font);
  font-size: 0.72rem;
  color: var(--text-muted);
}

.showcase-footer {
  margin-top: auto;
  padding-top: 18px;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  font-family: var(--mono-font);
  font-size: 0.82rem;
  color: var(--text-secondary);
}

/* ==========================================================================
   Smooth Card Cascade (Pricing Deck with Spring-Physics Fanning)
   ========================================================================== */
.pricing-deck-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
  perspective: 1200px;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 38px 30px;
  box-shadow: var(--card-shadow);
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.3s ease, border-color 0.3s ease;
  transform-origin: bottom center;
}

/* Deck Fanning Physics on Container Hover */
.pricing-deck-container:hover .pricing-card:nth-child(1) {
  transform: rotate(-1.5deg) translateY(-4px);
}

.pricing-deck-container:hover .pricing-card:nth-child(2) {
  transform: rotate(0deg) translateY(-8px);
}

.pricing-deck-container:hover .pricing-card:nth-child(3) {
  transform: rotate(1.5deg) translateY(-4px);
}

/* Direct Card Focus */
.pricing-card:hover {
  transform: scale(1.04) translateY(-14px) !important;
  z-index: 10;
  border-color: var(--accent-neon);
  box-shadow: var(--card-shadow-hover);
}

.pricing-card.featured {
  border: 2px solid var(--accent-neon);
  background: var(--bg-surface-elevated);
}

.pricing-featured-badge {
  position: absolute;
  top: -14px;
  left: 28px;
  background: var(--accent-neon);
  color: var(--accent-contrast);
  font-family: var(--mono-font);
  font-size: 0.72rem;
  font-weight: 900;
  padding: 4px 12px;
  border-radius: 4px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.pricing-tier-header {
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
}

.pricing-tier-name {
  font-size: 1.45rem;
  font-weight: 900;
  color: var(--text-primary);
  margin-bottom: 6px;
  letter-spacing: -0.02em;
}

.pricing-tier-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  min-height: 44px;
}

.pricing-price-box {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-top: 16px;
}

.price-currency {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-primary);
}

.price-amount {
  font-size: 3rem;
  font-weight: 900;
  font-family: var(--mono-font);
  line-height: 1;
  color: var(--text-primary);
}

.price-period {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-left: 4px;
}

.pricing-feature-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 36px;
  flex-grow: 1;
}

.pricing-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.check-bullet {
  font-family: var(--mono-font);
  font-size: 0.82rem;
  font-weight: 900;
  color: var(--accent-neon);
  flex-shrink: 0;
  margin-top: 2px;
}

.pricing-feature-item.muted {
  color: var(--text-muted);
  text-decoration: line-through;
}

.pricing-feature-item.muted .check-bullet {
  color: var(--text-muted);
}

/* ==========================================================================
   Reviews / Testimonials
   ========================================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 32px 28px;
  box-shadow: var(--card-shadow);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.25s ease;
}

.review-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
  box-shadow: var(--card-shadow-hover);
}

.review-meta-top {
  display: flex;
  justify-content: space-between;
  margin-bottom: 16px;
  font-family: var(--mono-font);
  font-size: 0.78rem;
  color: var(--accent-neon);
}

.review-text {
  font-size: 0.96rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.review-author {
  border-top: 1px solid var(--border-color);
  padding-top: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.author-info h4 {
  font-size: 0.95rem;
  font-weight: 800;
  color: var(--text-primary);
}

.author-info span {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.verified-stamp {
  font-family: var(--mono-font);
  font-size: 0.7rem;
  font-weight: 800;
  background: var(--badge-bg);
  color: var(--accent-neon);
  padding: 2px 6px;
  border-radius: 3px;
}

/* ==========================================================================
   FAQ Section
   ========================================================================== */
.faq-container {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  overflow: hidden;
  transition: border-color 0.2s ease;
}

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

.faq-question {
  width: 100%;
  padding: 22px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-align: left;
  font-size: 1.08rem;
  font-weight: 800;
  color: var(--text-primary);
  gap: 16px;
}

.faq-question .indicator {
  font-family: var(--mono-font);
  font-size: 1.15rem;
  color: var(--text-muted);
  transition: transform 0.3s ease, color 0.3s ease;
}

.faq-item.active .indicator {
  transform: rotate(45deg);
  color: var(--accent-neon);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0.16, 1, 0.3, 1), padding 0.35s ease;
  padding: 0 28px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.75;
}

.faq-item.active .faq-answer {
  max-height: 350px;
  padding: 0 28px 24px;
}

/* ==========================================================================
   Footer
   STRICT REQUIREMENT: Only four titles:
   网站地图, 关于我们, 服务条款, 隐私政策
   Open in new tabs.
   ========================================================================== */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 56px 0 40px;
  margin-top: auto;
  transition: background-color var(--transition-speed) ease;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}

.footer-link {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-secondary);
  letter-spacing: -0.01em;
}

.footer-link:hover {
  color: var(--accent-neon);
}

.footer-copyright {
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-muted);
  font-family: var(--mono-font);
}

/* ==========================================================================
   Secondary & Insights Article Pages & In-Depth SEO Reader
   ========================================================================== */
.page-header {
  padding: 64px 0 44px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  text-align: center;
}

.page-title {
  font-size: 2.6rem;
  font-weight: 900;
  color: var(--text-primary);
  margin-bottom: 12px;
  letter-spacing: -0.03em;
}

.page-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto;
}

.page-content-wrapper {
  max-width: 880px;
  margin: 48px auto 88px;
  padding: 0 24px;
}

/* SEO In-Depth Article Page Specifics */
.article-container {
  max-width: 900px;
  margin: 40px auto 80px;
  padding: 0 24px;
}

.article-header {
  margin-bottom: 36px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-strong);
}

.article-headline {
  font-size: 2.4rem;
  font-weight: 900;
  line-height: 1.25;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  margin: 12px 0 16px;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  font-family: var(--mono-font);
  font-size: 0.82rem;
  color: var(--text-muted);
}

.article-meta-bar span strong {
  color: var(--text-primary);
}

/* Table of Contents (TOC) */
.article-toc {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--accent-neon);
  border-radius: 8px;
  padding: 24px 28px;
  margin: 32px 0 40px;
}

.article-toc-title {
  font-family: var(--mono-font);
  font-size: 0.95rem;
  font-weight: 900;
  color: var(--text-primary);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.article-toc ul {
  list-style: none;
  padding-left: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.article-toc li {
  font-size: 0.92rem;
  line-height: 1.6;
}

.article-toc a {
  color: var(--text-secondary);
  font-weight: 600;
  transition: color 0.2s ease;
}

.article-toc a:hover {
  color: var(--accent-neon);
  text-decoration: underline;
}

.article-toc .sub-item {
  padding-left: 18px;
  font-size: 0.88rem;
}

/* Article Body Content */
.article-body {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--text-secondary);
}

.article-body h2 {
  font-size: 1.7rem;
  font-weight: 900;
  color: var(--text-primary);
  margin: 44px 0 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-color);
  letter-spacing: -0.02em;
}

.article-body h3 {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-primary);
  margin: 28px 0 12px;
}

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

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

.article-body li {
  margin-bottom: 8px;
  line-height: 1.75;
}

.article-body strong {
  color: var(--text-primary);
}

.article-body a {
  color: var(--accent-neon);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.article-body a:hover {
  filter: brightness(1.15);
}

/* Callout Box */
.article-callout {
  background: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-left: 4px solid var(--accent-neon);
  border-radius: 8px;
  padding: 20px 24px;
  margin: 28px 0;
  font-size: 0.96rem;
}

.article-callout h4 {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 8px;
}

/* Technical Code Snippet Box */
.code-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 18px 22px;
  margin: 24px 0;
  overflow-x: auto;
  font-family: var(--mono-font);
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--text-primary);
}

/* Data Comparison Table */
.data-table-wrapper {
  overflow-x: auto;
  margin: 28px 0;
  border-radius: 8px;
  border: 1px solid var(--border-color);
}

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

.data-table th {
  background: var(--bg-secondary);
  color: var(--text-primary);
  padding: 14px 18px;
  font-weight: 800;
  font-family: var(--mono-font);
  border-bottom: 1px solid var(--border-strong);
}

.data-table td {
  padding: 12px 18px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-secondary);
}

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

.data-table tr:nth-child(even) td {
  background: rgba(0, 0, 0, 0.015);
}

[data-theme="dark"] .data-table tr:nth-child(even) td {
  background: rgba(255, 255, 255, 0.02);
}

/* Article In-Page FAQ Section */
.article-faq-section {
  margin: 48px 0 36px;
  padding: 32px;
  background: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: 12px;
}

.article-faq-section h3 {
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--text-primary);
  margin-bottom: 20px;
}

.article-faq-item {
  border-bottom: 1px solid var(--border-color);
  padding: 16px 0;
}

.article-faq-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.article-faq-q {
  font-weight: 800;
  font-size: 1.05rem;
  color: var(--text-primary);
  margin-bottom: 6px;
}

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

/* Article Bottom CTA Card */
.article-cta-box {
  background: var(--bg-surface);
  border: 2px solid var(--accent-neon);
  border-radius: 12px;
  padding: 36px;
  text-align: center;
  margin: 48px 0;
}

.article-cta-box h3 {
  font-size: 1.55rem;
  font-weight: 900;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.article-cta-box p {
  color: var(--text-secondary);
  font-size: 0.98rem;
  max-width: 580px;
  margin: 0 auto 24px;
}

/* Related Reading Section (相关阅读) */
.related-posts-section {
  margin: 56px 0 24px;
  padding-top: 36px;
  border-top: 1px solid var(--border-strong);
}

.related-posts-title {
  font-family: var(--mono-font);
  font-size: 1.25rem;
  font-weight: 900;
  color: var(--text-primary);
  margin-bottom: 24px;
  letter-spacing: -0.01em;
}

.related-posts-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.related-post-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 22px 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.25s ease;
}

.related-post-card:hover {
  border-color: var(--accent-neon);
  transform: translateY(-3px);
  box-shadow: var(--card-shadow);
}

.related-post-card h4 {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.45;
}

.related-post-card p {
  font-size: 0.86rem;
  color: var(--text-secondary);
  margin-bottom: 14px;
  line-height: 1.55;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.related-post-meta {
  font-family: var(--mono-font);
  font-size: 0.76rem;
  color: var(--accent-neon);
  display: flex;
  justify-content: space-between;
}

@media (max-width: 768px) {
  .related-posts-grid {
    grid-template-columns: 1fr;
  }

  .article-headline {
    font-size: 1.85rem;
  }
}

.content-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 42px 36px;
  box-shadow: var(--card-shadow);
  margin-bottom: 32px;
}

.content-card h2 {
  font-size: 1.55rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 18px;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 10px;
}

.content-card h2::before {
  content: '';
  display: inline-block;
  width: 4px;
  height: 22px;
  background: var(--accent-neon);
  border-radius: 2px;
}

.content-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 24px 0 12px;
}

.content-card p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 18px;
  font-size: 0.98rem;
}

.content-card ul {
  list-style: none;
  margin-bottom: 20px;
}

.content-card li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 10px;
  line-height: 1.7;
  color: var(--text-secondary);
}

.content-card li::before {
  content: '■';
  position: absolute;
  left: 0;
  top: 1px;
  font-size: 0.65rem;
  color: var(--accent-neon);
}

/* ==========================================================================
   Responsive Adaptations (@media)
   ========================================================================== */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .advantages-grid {
    grid-template-columns: 1fr;
  }

  .showcase-grid {
    grid-template-columns: 1fr;
  }

  .pricing-deck-container {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin: 0 auto;
  }

  .pricing-deck-container:hover .pricing-card {
    transform: none !important;
  }

  .pricing-card:hover {
    transform: translateY(-6px) !important;
  }

  .reviews-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 74px;
    left: 0;
    right: 0;
    background: var(--nav-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 24px;
    flex-direction: column;
    align-items: flex-start;
    gap: 18px;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.15);
  }

  .nav-links.active {
    display: flex;
  }

  .mobile-menu-btn {
    display: inline-flex;
  }

  .hero-headline {
    font-size: 2.35rem;
  }

  .hero-cta-bar {
    flex-direction: column;
    width: 100%;
  }

  .hero-cta-bar .btn {
    width: 100%;
  }

  .hero-meta-row {
    flex-direction: column;
    gap: 8px;
  }

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

  .footer-nav {
    flex-direction: column;
    gap: 16px;
  }

  .section {
    padding: 64px 0;
  }

  .section-title {
    font-size: 1.95rem;
  }
}

@media (max-width: 480px) {
  .app-badge-grid {
    grid-template-columns: 1fr;
  }

  .metric-row {
    grid-template-columns: 1fr;
  }

  .btn {
    min-height: 48px;
  }
}