/* ==========================================================================
   一分机场 (yfjichang.sbs) Design System - Light Series (全站一致浅色系)
   Aesthetic Theme: First-Groove Vinyl & Needle Micro-Tracking (极简黑胶音轨微缝)
   ========================================================================== */

:root {
  --bg-primary: #f4f6f9;
  --bg-surface: #eaeef3;
  --bg-card: #ffffff;
  --bg-card-hover: #ffffff;
  --bg-glass: rgba(244, 246, 249, 0.88);
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;

  --accent-silver: #334155;
  --accent-cyan: #0284c7;
  --accent-glow: rgba(2, 132, 199, 0.15);
  --accent-dark: #0f172a;
  
  --border-hairline: #e2e8f0;
  --border-active: #0f172a;

  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "Fira Code", Consolas, Monaco, "Courier New", monospace;
  
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 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);
  color: var(--text-primary);
  font-family: var(--font-family);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
  -webkit-font-smoothing: antialiased;
}

/* Vinyl Micro-groove Conic Light Background Texture */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: 
    radial-gradient(circle at 50% 20%, rgba(2, 132, 199, 0.04) 0%, transparent 60%),
    repeating-radial-gradient(circle at 50% 50%, rgba(15, 23, 42, 0.015) 0px, rgba(15, 23, 42, 0.015) 1px, transparent 1px, transparent 4px);
  pointer-events: none;
  z-index: 0;
}

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

ul {
  list-style: none;
}

/* Container */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 1.5rem;
  position: relative;
  z-index: 1;
}

/* Typography Helpers */
.gradient-text {
  background: linear-gradient(135deg, #0f172a 0%, #334155 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 1rem;
  background: #e2e8f0;
  border: 1px solid #cbd5e1;
  border-radius: var(--radius-full);
  color: #0f172a;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
  color: #0f172a;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 680px;
  margin: 0 auto 3rem auto;
}

.text-center {
  text-align: center;
}

/* Header & Navigation */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 72px;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-hairline);
  z-index: 1000;
  display: flex;
  align-items: center;
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: #0f172a;
}

.logo-vinyl-icon {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: radial-gradient(circle, #333 20%, #111 21%, #111 40%, #222 41%, #050505 100%);
  border: 2px solid #0f172a;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
  animation: vinylRotate 8s linear infinite;
}

.logo-vinyl-icon::after {
  content: "";
  width: 8px;
  height: 8px;
  background: #38bdf8;
  border-radius: 50%;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-link {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 600;
  transition: var(--transition-fast);
}

.nav-link:hover {
  color: var(--text-primary);
}

.btn-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  background: #0f172a;
  color: #ffffff;
  border: none;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  transition: var(--transition-fast);
  box-shadow: 0 4px 14px rgba(15, 23, 42, 0.15);
  position: relative;
  overflow: hidden;
}

.btn-cta:hover {
  background: #1e293b;
  color: #ffffff;
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(15, 23, 42, 0.25);
}

.btn-primary-highlight {
  background: #0f172a;
  color: #ffffff;
  font-weight: 800;
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

/* HERO SECTION */
.hero {
  padding-top: 140px;
  padding-bottom: 80px;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.hero-badge-container {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1.1rem;
  background: #ffffff;
  border: 1px solid #cbd5e1;
  border-radius: var(--radius-full);
  margin-bottom: 1.5rem;
  font-size: 0.85rem;
  color: #1e293b;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.hero-badge-dot {
  width: 8px;
  height: 8px;
  background: #16a34a;
  border-radius: 50%;
}

.hero-title {
  font-size: 3.25rem;
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 1.25rem;
  letter-spacing: -0.03em;
  color: #0f172a;
}

.hero-description {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  width: 100%;
  padding-top: 2rem;
  border-top: 1px solid var(--border-hairline);
}

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-value {
  font-size: 1.75rem;
  font-weight: 900;
  color: var(--text-primary);
  font-family: var(--font-mono);
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Vinyl Player Interactive Widget */
.vinyl-widget-container {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.vinyl-turntable-card {
  width: 100%;
  max-width: 480px;
  background: #ffffff;
  border: 1px solid #cbd5e1;
  border-radius: var(--radius-lg);
  padding: 2rem;
  position: relative;
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
  overflow: hidden;
}

.vinyl-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.stylus-badge {
  color: #0f172a;
  font-weight: 700;
  background: #f1f5f9;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid #cbd5e1;
}

/* Vinyl Disc Render */
.vinyl-disc-wrapper {
  position: relative;
  width: 260px;
  height: 260px;
  margin: 0 auto 1.5rem auto;
}

.vinyl-disc {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: 
    radial-gradient(circle at 50% 50%, 
      #050505 0%, #050505 15%, 
      #0284c7 15.5%, #0369a1 28%, 
      #111 28.5%, #181818 32%, 
      #0a0a0a 32.5%, #141414 45%, 
      #050505 45.5%, #1a1a1a 60%, 
      #080808 60.5%, #1c1c1c 85%, 
      #000000 85.5%, #111111 100%);
  box-shadow: 
    0 0 0 4px #e2e8f0,
    0 10px 25px rgba(0, 0, 0, 0.25);
  position: relative;
  transition: transform 0.5s ease;
  cursor: pointer;
}

.vinyl-disc.playing {
  animation: vinylSpin 6s linear infinite;
}

.vinyl-lead-in-groove {
  position: absolute;
  top: 6px;
  left: 6px;
  right: 6px;
  bottom: 6px;
  border: 1px dashed rgba(56, 189, 248, 0.6);
  border-radius: 50%;
  pointer-events: none;
}

.vinyl-label-center {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 76px;
  height: 76px;
  background: #0f172a;
  border: 2px solid #38bdf8;
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.vinyl-brand-text {
  font-size: 0.65rem;
  font-weight: 800;
  color: #38bdf8;
  letter-spacing: 0.05em;
}

.vinyl-spindle-hole {
  width: 8px;
  height: 8px;
  background: #000;
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: 50%;
  margin-top: 4px;
}

.tonearm {
  position: absolute;
  top: -10px;
  right: 15px;
  width: 90px;
  height: 170px;
  pointer-events: none;
  z-index: 10;
  transition: transform 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
  transform-origin: top right;
}

.tonearm-pivot {
  position: absolute;
  top: 0;
  right: 0;
  width: 28px;
  height: 28px;
  background: #475569;
  border: 2px solid #cbd5e1;
  border-radius: 50%;
}

.tonearm-stick {
  position: absolute;
  top: 14px;
  right: 12px;
  width: 4px;
  height: 130px;
  background: #64748b;
  transform: rotate(-22deg);
  transform-origin: top center;
  border-radius: 2px;
}

.tonearm-headshell {
  position: absolute;
  bottom: 0;
  left: 18px;
  width: 12px;
  height: 22px;
  background: #0284c7;
  border-radius: 2px;
}

.needle-tip {
  position: absolute;
  bottom: -4px;
  left: 4px;
  width: 4px;
  height: 6px;
  background: #000;
  clip-path: polygon(50% 100%, 0 0, 100% 0);
}

.vinyl-turntable-card.active .tonearm {
  transform: rotate(18deg);
}

/* Audio Visualizer Wave */
.audio-visualizer {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 4px;
  height: 32px;
  margin-top: 1rem;
}

.visualizer-bar {
  width: 4px;
  background: #0f172a;
  border-radius: 2px;
  height: 20%;
  transition: height 0.15s ease;
}

.vinyl-turntable-card.active .visualizer-bar {
  animation: audioWave 1.2s ease-in-out infinite alternate;
}

.visualizer-bar:nth-child(1) { animation-delay: 0.1s; }
.visualizer-bar:nth-child(2) { animation-delay: 0.3s; }
.visualizer-bar:nth-child(3) { animation-delay: 0.2s; }
.visualizer-bar:nth-child(4) { animation-delay: 0.4s; }
.visualizer-bar:nth-child(5) { animation-delay: 0.15s; }
.visualizer-bar:nth-child(6) { animation-delay: 0.35s; }
.visualizer-bar:nth-child(7) { animation-delay: 0.25s; }
.visualizer-bar:nth-child(8) { animation-delay: 0.5s; }

.lead-in-notice {
  text-align: center;
  margin-top: 1rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
  background: #f8fafc;
  padding: 0.6rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid #e2e8f0;
}

@keyframes vinylSpin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes audioWave {
  0% { height: 15%; }
  100% { height: 95%; }
}

/* SECTION STYLES */
.section {
  padding: 90px 0;
  position: relative;
}

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

/* ADVANTAGES GRID */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.adv-card {
  background: #ffffff;
  border: 1px solid #cbd5e1;
  border-radius: var(--radius-md);
  padding: 2rem;
  transition: var(--transition-normal);
  box-shadow: 0 4px 12px rgba(15, 23, 42, 0.03);
}

.adv-card:hover {
  transform: translateY(-4px);
  border-color: #0f172a;
  box-shadow: 0 10px 25px rgba(15, 23, 42, 0.08);
}

.adv-badge-code {
  font-size: 0.8rem;
  font-weight: 800;
  color: #0f172a;
  background: #f1f5f9;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  display: inline-block;
  margin-bottom: 1rem;
  border: 1px solid #e2e8f0;
}

.adv-title {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 0.75rem;
  color: #0f172a;
}

.adv-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* PRICING SECTION - Matched to User Reference Screenshot */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  align-items: stretch;
  margin-top: 2rem;
}

.pricing-card {
  background: #ffffff;
  color: #0f172a;
  border-radius: 4px;
  padding: 2.5rem 2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  box-shadow: 0 4px 20px rgba(15, 23, 42, 0.05);
  transition: var(--transition-normal);
  border: 1px solid #cbd5e1;
}

.pricing-card.popular {
  border: 2px solid #0f172a;
  transform: scale(1.03);
  z-index: 2;
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.12);
}

.pricing-popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: #0f172a;
  color: #ffffff;
  padding: 0.25rem 1.25rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.pricing-header {
  margin-bottom: 1.5rem;
}

.pricing-subheading {
  font-size: 0.9rem;
  color: #64748b;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.pricing-bandwidth {
  font-size: 2.5rem;
  font-weight: 900;
  color: #0f172a;
  line-height: 1;
  margin-bottom: 0.75rem;
  font-family: var(--font-mono);
}

.pricing-price-box {
  display: flex;
  align-items: baseline;
  gap: 0.25rem;
  margin-bottom: 0.5rem;
}

.pricing-price-num {
  font-size: 2.75rem;
  font-weight: 900;
  color: #0f172a;
  line-height: 1;
  font-family: var(--font-mono);
}

.pricing-unit {
  font-size: 0.95rem;
  color: #64748b;
  font-weight: 600;
}

.pricing-cycle-details {
  font-size: 0.85rem;
  color: #64748b;
  margin-bottom: 1.5rem;
}

.pricing-divider {
  border: none;
  border-top: 1px dashed #cbd5e1;
  margin: 1.5rem 0;
}

.pricing-features {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin-bottom: 2.5rem;
  flex-grow: 1;
}

.pricing-feature-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  color: #334155;
  font-weight: 600;
}

.pricing-feature-item svg {
  width: 16px;
  height: 16px;
  color: #0f172a;
  flex-shrink: 0;
}

.btn-pricing {
  width: 100%;
  padding: 0.9rem 1rem;
  background: #0f172a;
  color: #ffffff;
  border: none;
  border-radius: 4px;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  text-align: center;
  transition: var(--transition-fast);
  display: inline-block;
}

.btn-pricing:hover {
  background: #1e293b;
  color: #ffffff;
  box-shadow: 0 4px 15px rgba(15, 23, 42, 0.3);
}

/* AUDIENCE SECTION */
.audience-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
}

.audience-card {
  background: #ffffff;
  border: 1px solid #cbd5e1;
  border-radius: var(--radius-md);
  padding: 1.75rem;
  text-align: center;
  transition: var(--transition-normal);
}

.audience-card:hover {
  border-color: #0f172a;
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(15, 23, 42, 0.06);
}

.audience-tag-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 800;
  color: #0f172a;
  background: #f1f5f9;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
  margin-bottom: 0.75rem;
}

.audience-title {
  font-size: 1.1rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
  color: #0f172a;
}

.audience-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
}

/* CLASH TUTORIAL STEPPER SECTION */
.tutorial-tab-nav {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}

.tab-btn {
  padding: 0.75rem 1.75rem;
  background: #ffffff;
  border: 1px solid #cbd5e1;
  border-radius: var(--radius-full);
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-fast);
}

.tab-btn.active, .tab-btn:hover {
  background: #0f172a;
  border-color: #0f172a;
  color: #ffffff;
}

.tutorial-content-pane {
  display: none;
  background: #ffffff;
  border: 1px solid #cbd5e1;
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: 0 4px 20px rgba(15, 23, 42, 0.04);
}

.tutorial-content-pane.active {
  display: block;
  animation: fadeIn 0.4s ease;
}

.step-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

.step-item {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-md);
  padding: 1.5rem;
  position: relative;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: #0f172a;
  color: #ffffff;
  font-weight: 900;
  border-radius: 50%;
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

.step-title {
  font-size: 1.1rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
  color: #0f172a;
}

.step-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* LATENCY SPEEDTEST SIMULATOR WIDGET */
.speedtest-widget {
  background: #ffffff;
  border: 1px solid #cbd5e1;
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: 0 4px 20px rgba(15, 23, 42, 0.04);
}

.speedtest-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.nodes-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}

.node-card {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.node-flag-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.node-region-pill {
  font-size: 0.75rem;
  font-weight: 800;
  color: #0f172a;
  background: #e2e8f0;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
}

.node-name {
  font-weight: 800;
  font-size: 0.95rem;
  color: #0f172a;
}

.node-protocol {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.node-ping-badge {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 0.9rem;
  color: #15803d;
  background: #dcfce7;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  border: 1px solid #bbf7d0;
}

/* REVIEWS GRID */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.review-card {
  background: #ffffff;
  border: 1px solid #cbd5e1;
  border-radius: var(--radius-md);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: 0 4px 12px rgba(15, 23, 42, 0.03);
}

.review-rating-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 800;
  color: #15803d;
  background: #dcfce7;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
  width: fit-content;
}

.review-quote {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.author-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: #0f172a;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: #fff;
}

.author-name {
  font-size: 0.9rem;
  font-weight: 800;
  color: #0f172a;
}

.author-role {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* FAQ ACCORDION */
.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background: #ffffff;
  border: 1px solid #cbd5e1;
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition-fast);
}

.faq-question {
  padding: 1.25rem 1.5rem;
  font-size: 1.05rem;
  font-weight: 800;
  color: #0f172a;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  user-select: none;
}

.faq-icon {
  font-size: 1.25rem;
  transition: transform 0.3s ease;
  color: #0f172a;
  font-weight: 900;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  background: #f8fafc;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

.faq-item.active .faq-answer {
  max-height: 500px;
  padding: 1.25rem 1.5rem;
  border-top: 1px solid #e2e8f0;
}

/* ARTICLE DIRECTORY GRID */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}

.article-card {
  background: #ffffff;
  border: 1px solid #cbd5e1;
  border-radius: var(--radius-md);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition-normal);
  box-shadow: 0 4px 12px rgba(15, 23, 42, 0.03);
}

.article-card:hover {
  transform: translateY(-4px);
  border-color: #0f172a;
  box-shadow: 0 10px 25px rgba(15, 23, 42, 0.08);
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.article-tag {
  background: #f1f5f9;
  color: #0f172a;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
  font-weight: 700;
}

.article-card-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: #0f172a;
  margin-bottom: 0.75rem;
  line-height: 1.4;
}

.article-card-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  line-height: 1.6;
}

.article-read-more {
  color: #0f172a;
  font-weight: 800;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

/* FOOTER - Clean Light Style matching the entire site */
.footer {
  background: #ffffff;
  border-top: 1px solid #cbd5e1;
  padding: 70px 0 35px 0;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand-desc {
  margin-top: 1rem;
  font-size: 0.88rem;
  color: var(--text-muted);
  max-width: 320px;
}

.footer-col-title {
  color: #0f172a;
  font-size: 1rem;
  font-weight: 800;
  margin-bottom: 1.25rem;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-link {
  transition: var(--transition-fast);
  color: #475569;
}

.footer-link:hover {
  color: #0f172a;
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid #e2e8f0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ARTICLE DETAIL PAGE STYLES */
.article-page {
  padding-top: 120px;
  padding-bottom: 80px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
}

.article-header {
  margin-bottom: 2.5rem;
  border-bottom: 1px solid var(--border-hairline);
  padding-bottom: 2rem;
}

.article-header-h1 {
  font-size: 2.5rem;
  font-weight: 900;
  color: #0f172a;
  margin-bottom: 1rem;
  line-height: 1.25;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.article-body {
  font-size: 1.05rem;
  line-height: 1.8;
  color: #334155;
  max-width: 860px;
}

.article-body h2 {
  font-size: 1.75rem;
  color: #0f172a;
  margin: 2.5rem 0 1.25rem 0;
  font-weight: 800;
  border-left: 4px solid #0f172a;
  padding-left: 1rem;
}

.article-body h3 {
  font-size: 1.35rem;
  color: #0f172a;
  margin: 2rem 0 1rem 0;
  font-weight: 800;
}

.article-body p {
  margin-bottom: 1.5rem;
}

.article-body ul, .article-body ol {
  margin: 0 0 1.5rem 1.5rem;
}

.article-body li {
  margin-bottom: 0.5rem;
}

.article-body blockquote {
  background: #f8fafc;
  border-left: 4px solid #0f172a;
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  color: var(--text-secondary);
}

.article-cta-box {
  background: #ffffff;
  border: 1px solid #0f172a;
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  text-align: center;
  margin: 3rem 0;
  box-shadow: 0 4px 20px rgba(15, 23, 42, 0.08);
}

.article-faq-section {
  margin-top: 4rem;
  padding-top: 3rem;
  border-top: 1px solid var(--border-hairline);
}

.related-articles {
  margin-top: 4rem;
  padding-top: 3rem;
  border-top: 1px solid var(--border-hairline);
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 992px) {
  .hero-grid { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: 1fr; }
  .pricing-card.popular { transform: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .nav-menu { display: none; }
  .mobile-menu-btn { display: block; }
  .hero-title { font-size: 2.25rem; }
  .section-title { font-size: 1.75rem; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-stats { grid-template-columns: 1fr; text-align: center; }
  .vinyl-disc-wrapper { width: 220px; height: 220px; }
  .tonearm { right: 5px; height: 140px; }
}