/* ==========================================================================
   秒秒云 (miaomiao-yun.autos) — Grand Prix Motorsport Telemetry & Aerodynamic Slipstream
   Palette:
   - Asphalt Anthracite: #101216
   - Pit-Wall Slate: #181C24
   - Carbon Chassis Border: #28303E
   - Titanium Silver: #F1F5F9
   - Telemetry Muted Silver: #94A3B8
   - Racing Rosso Red: #E11D48
   - Tachometer Yellow: #FACC15
   ========================================================================== */

:root {
  --bg-asphalt: #101216;
  --bg-pitwall: #181C24;
  --bg-pitwall-elevated: #1F2430;
  --border-chassis: #28303E;
  --text-titanium: #F1F5F9;
  --text-muted: #94A3B8;
  --racing-red: #E11D48;
  --racing-red-bright: #FB7185;
  --tach-yellow: #FACC15;
  --sector-purple: #C084FC;
  --sector-green: #22C55E;
  --max-width: 1200px;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  background-color: var(--bg-asphalt);
  color: var(--text-titanium);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

body {
  background-color: var(--bg-asphalt);
  background-image:
    linear-gradient(125deg, rgba(225, 29, 72, 0.06) 0%, transparent 38%),
    linear-gradient(305deg, rgba(250, 204, 21, 0.04) 0%, transparent 35%),
    repeating-linear-gradient(-45deg, rgba(255, 255, 255, 0.012) 0px, rgba(255, 255, 255, 0.012) 2px, transparent 2px, transparent 14px);
  color: var(--text-titanium);
  overflow-x: hidden;
}

/* Global Hyperlink Consistency (Rule: Prominent accent color, identical before & after visited) */
a, a:visited {
  color: var(--tach-yellow);
  text-decoration: none;
  transition: color 0.2s ease, opacity 0.2s ease;
}

a:hover, a:focus {
  color: var(--racing-red-bright);
  text-decoration: underline;
}

.article-body a,
.article-body a:visited,
.telemetry-card p a,
.telemetry-card p a:visited,
.faq-answer a,
.faq-answer a:visited {
  color: var(--tach-yellow);
  font-weight: 600;
  border-bottom: 1px dashed rgba(250, 204, 21, 0.55);
  padding-bottom: 1px;
}

.article-body a:hover,
.telemetry-card p a:hover {
  color: #FFFFFF;
  border-bottom-style: solid;
  border-bottom-color: var(--racing-red);
  text-decoration: none;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* Kerb Stripe Top Bar */
.kerb-stripe {
  height: 5px;
  width: 100%;
  background: repeating-linear-gradient(
    -55deg,
    var(--racing-red) 0px,
    var(--racing-red) 24px,
    var(--tach-yellow) 24px,
    var(--tach-yellow) 48px,
    #181C24 48px,
    #181C24 60px
  );
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(16, 18, 22, 0.94);
  border-bottom: 1px solid var(--border-chassis);
  backdrop-filter: blur(8px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
  gap: 16px;
  flex-wrap: wrap;
}

.brand-logo, .brand-logo:visited {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--text-titanium);
  text-decoration: none;
}

.brand-logo:hover {
  color: var(--tach-yellow);
  text-decoration: none;
}

.brand-logo svg {
  width: 46px;
  height: 40px;
  flex-shrink: 0;
}

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

.brand-title {
  font-size: 1.35rem;
  font-weight: 900;
  letter-spacing: 0.04em;
  font-style: italic;
  color: var(--text-titanium);
  line-height: 1.1;
}

.brand-tag {
  font-size: 0.7rem;
  font-family: "Consolas", "Monaco", monospace;
  color: var(--tach-yellow);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.main-nav a,
.main-nav a:visited {
  color: var(--text-titanium);
  font-size: 0.92rem;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: 4px;
  background: rgba(24, 28, 36, 0.8);
  border: 1px solid transparent;
  transition: all 0.2s ease;
  text-decoration: none;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--tach-yellow);
  border-color: var(--racing-red);
  background: rgba(225, 29, 72, 0.12);
  text-decoration: none;
}

.main-nav a.nav-hub-pill,
.main-nav a.nav-hub-pill:visited {
  background: linear-gradient(135deg, rgba(225, 29, 72, 0.22), rgba(250, 204, 21, 0.15));
  border: 1px solid var(--tach-yellow);
  color: var(--tach-yellow);
  font-weight: 700;
}

.main-nav a.nav-hub-pill:hover {
  background: var(--tach-yellow);
  color: #101216;
}

/* Hero Section */
.hero-section {
  padding: 64px 0 56px;
  position: relative;
  border-bottom: 1px solid var(--border-chassis);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.12fr 0.88fr;
  gap: 40px;
  align-items: center;
}

.telemetry-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 14px;
  background: rgba(225, 29, 72, 0.14);
  border-left: 4px solid var(--racing-red);
  border-top: 1px solid rgba(225, 29, 72, 0.35);
  border-right: 1px solid rgba(225, 29, 72, 0.35);
  border-bottom: 1px solid rgba(225, 29, 72, 0.35);
  font-family: "Consolas", "Monaco", monospace;
  font-size: 0.82rem;
  color: var(--tach-yellow);
  margin-bottom: 18px;
  letter-spacing: 0.05em;
}

.hero-content h1 {
  font-size: clamp(2rem, 3.8vw, 3.05rem);
  font-weight: 900;
  line-height: 1.18;
  margin-bottom: 20px;
  color: var(--text-titanium);
  letter-spacing: -0.01em;
}

.hero-content h1 .highlight-chrono {
  color: var(--tach-yellow);
  font-style: italic;
}

.hero-content h1 .highlight-red {
  color: var(--racing-red-bright);
}

.hero-subtitle {
  font-size: 1.08rem;
  color: var(--text-muted);
  margin-bottom: 28px;
  max-width: 620px;
}

.sector-readout-bar {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 30px;
  background: var(--bg-pitwall);
  border: 1px solid var(--border-chassis);
  padding: 14px 16px;
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
}

.sector-metric {
  border-left: 3px solid var(--racing-red);
  padding-left: 10px;
}

.sector-metric:nth-child(2) {
  border-left-color: var(--tach-yellow);
}

.sector-metric:nth-child(3) {
  border-left-color: var(--sector-green);
}

.sector-label {
  font-size: 0.72rem;
  font-family: "Consolas", monospace;
  color: var(--text-muted);
  display: block;
}

.sector-val {
  font-size: 1.15rem;
  font-weight: 800;
  font-family: "Consolas", monospace;
  color: var(--text-titanium);
}

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

.btn-primary-gp,
.btn-primary-gp:visited {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: linear-gradient(135deg, var(--racing-red) 0%, #BE123C 100%);
  color: #FFFFFF;
  font-weight: 800;
  font-size: 1.04rem;
  padding: 15px 30px;
  border: 1px solid #FB7185;
  clip-path: polygon(10px 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
  box-shadow: 0 8px 24px rgba(225, 29, 72, 0.35);
  text-decoration: none;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.btn-primary-gp:hover {
  background: linear-gradient(135deg, var(--tach-yellow) 0%, #EAB308 100%);
  color: #101216;
  border-color: var(--tach-yellow);
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(250, 204, 21, 0.4);
  text-decoration: none;
}

.btn-secondary-gp,
.btn-secondary-gp:visited {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--bg-pitwall-elevated);
  color: var(--tach-yellow);
  font-weight: 700;
  font-size: 1rem;
  padding: 15px 26px;
  border: 1px solid var(--tach-yellow);
  clip-path: polygon(10px 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
  text-decoration: none;
  transition: all 0.18s ease;
}

.btn-secondary-gp:hover {
  background: rgba(250, 204, 21, 0.16);
  color: #FFFFFF;
  border-color: #FFFFFF;
  transform: translateY(-2px);
  text-decoration: none;
}

.hero-visual-box {
  background: var(--bg-pitwall);
  border: 1px solid var(--border-chassis);
  padding: 14px;
  position: relative;
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 22px 100%, 0 calc(100% - 22px));
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.55);
}

.hero-anim-img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 2px;
}

/* Section Scaffolding */
.section-block {
  padding: 72px 0;
  border-bottom: 1px solid var(--border-chassis);
}

.section-header {
  margin-bottom: 44px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.section-kicker {
  font-family: "Consolas", "Monaco", monospace;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--racing-red-bright);
  display: flex;
  align-items: center;
  gap: 8px;
}

.section-kicker::before {
  content: "";
  display: inline-block;
  width: 18px;
  height: 3px;
  background: var(--tach-yellow);
}

.section-title {
  font-size: clamp(1.65rem, 2.8vw, 2.25rem);
  font-weight: 900;
  color: var(--text-titanium);
  letter-spacing: 0.01em;
}

.section-desc {
  color: var(--text-muted);
  max-width: 720px;
  font-size: 1rem;
}

/* Telemetry Grid & Cards (4 cards) */
.telemetry-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.telemetry-card {
  background: var(--bg-pitwall);
  border: 1px solid var(--border-chassis);
  border-top: 3px solid var(--racing-red);
  padding: 26px 22px;
  position: relative;
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.telemetry-card:nth-child(even) {
  border-top-color: var(--tach-yellow);
}

.telemetry-card:hover {
  transform: translateY(-4px);
  border-color: var(--tach-yellow);
}

.card-sector-tag {
  position: absolute;
  top: 12px;
  right: 16px;
  font-family: "Consolas", monospace;
  font-size: 0.72rem;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.04);
  padding: 2px 7px;
  border: 1px solid var(--border-chassis);
}

.card-icon-wrap {
  width: 48px;
  height: 48px;
  background: rgba(225, 29, 72, 0.1);
  border: 1px solid rgba(250, 204, 21, 0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}

.card-icon-wrap svg {
  width: 28px;
  height: 28px;
}

.telemetry-card h3 {
  font-size: 1.18rem;
  font-weight: 800;
  margin-bottom: 10px;
  color: var(--text-titanium);
}

.telemetry-card p {
  font-size: 0.93rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* Pricing Podium 3-Tier Grid */
.podium-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
  align-items: stretch;
}

.podium-card {
  background: var(--bg-pitwall);
  border: 1px solid var(--border-chassis);
  padding: 32px 26px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
}

.podium-card.pole-position {
  background: linear-gradient(180deg, #221A24 0%, var(--bg-pitwall) 100%);
  border: 2px solid var(--tach-yellow);
  transform: translateY(-6px);
  box-shadow: 0 16px 40px rgba(225, 29, 72, 0.22);
}

.pole-ribbon {
  display: inline-block;
  align-self: flex-start;
  background: var(--tach-yellow);
  color: #101216;
  font-size: 0.75rem;
  font-weight: 900;
  font-family: "Consolas", monospace;
  padding: 3px 10px;
  margin-bottom: 12px;
  text-transform: uppercase;
}

.tier-name {
  font-size: 1.35rem;
  font-weight: 900;
  color: var(--text-titanium);
  margin-bottom: 6px;
}

.tier-sub {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.tier-price {
  font-size: 2.3rem;
  font-weight: 900;
  font-family: "Consolas", monospace;
  color: var(--tach-yellow);
  margin-bottom: 22px;
  border-bottom: 1px solid var(--border-chassis);
  padding-bottom: 16px;
}

.tier-price span {
  font-size: 0.95rem;
  color: var(--text-muted);
  font-weight: 500;
}

.spec-list {
  list-style: none;
  margin-bottom: 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.spec-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.94rem;
  color: var(--text-titanium);
}

.spec-list li svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* FAQ Section */
.faq-stack {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.faq-item {
  background: var(--bg-pitwall);
  border: 1px solid var(--border-chassis);
  border-left: 4px solid var(--racing-red);
  padding: 24px 26px;
}

.faq-item:nth-child(2) {
  border-left-color: var(--tach-yellow);
}

.faq-question {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-titanium);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.faq-q-tag {
  font-family: "Consolas", monospace;
  font-size: 0.8rem;
  background: rgba(225, 29, 72, 0.2);
  color: var(--tach-yellow);
  padding: 2px 8px;
  border: 1px solid var(--racing-red);
}

.faq-answer {
  color: var(--text-muted);
  font-size: 0.96rem;
  line-height: 1.7;
}

/* Testimonials (4 Items) */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}

.review-card {
  background: var(--bg-pitwall);
  border: 1px solid var(--border-chassis);
  padding: 26px;
  position: relative;
}

.review-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--border-chassis);
}

.driver-name {
  font-weight: 800;
  color: var(--text-titanium);
  font-size: 1.02rem;
}

.driver-role {
  font-size: 0.8rem;
  color: var(--tach-yellow);
  font-family: "Consolas", monospace;
}

.review-text {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-style: italic;
}

/* Hub Page & Article Cards */
.hub-cards-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 26px;
}

.article-card {
  background: var(--bg-pitwall);
  border: 1px solid var(--border-chassis);
  border-top: 3px solid var(--racing-red);
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.article-card:nth-child(even) {
  border-top-color: var(--tach-yellow);
}

.article-card:hover {
  transform: translateY(-4px);
  border-color: var(--tach-yellow);
}

.article-card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: "Consolas", monospace;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.sector-pill {
  background: rgba(225, 29, 72, 0.18);
  color: var(--tach-yellow);
  padding: 2px 9px;
  border: 1px solid rgba(250, 204, 21, 0.4);
  font-weight: 700;
}

.article-card h2,
.article-card h3 {
  font-size: 1.25rem;
  line-height: 1.4;
  margin-bottom: 12px;
}

.article-card h2 a,
.article-card h2 a:visited,
.article-card h3 a,
.article-card h3 a:visited {
  color: var(--text-titanium);
  text-decoration: none;
}

.article-card h2 a:hover,
.article-card h3 a:hover {
  color: var(--tach-yellow);
}

.article-card p {
  color: var(--text-muted);
  font-size: 0.94rem;
  margin-bottom: 18px;
}

.read-more-link,
.read-more-link:visited {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--tach-yellow);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* Single Article Page Layout */
.article-main {
  padding: 56px 0;
}

.article-container {
  max-width: 860px;
  margin: 0 auto;
  background: var(--bg-pitwall);
  border: 1px solid var(--border-chassis);
  padding: 44px 40px;
}

.breadcrumb-nav {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 20px;
  font-family: "Consolas", monospace;
}

.article-header {
  border-bottom: 1px solid var(--border-chassis);
  padding-bottom: 24px;
  margin-bottom: 30px;
}

.article-header h1 {
  font-size: clamp(1.65rem, 3vw, 2.25rem);
  font-weight: 900;
  line-height: 1.3;
  color: var(--text-titanium);
  margin-bottom: 14px;
}

.article-byline {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.84rem;
  color: var(--text-muted);
  font-family: "Consolas", monospace;
}

.article-body h2 {
  font-size: 1.42rem;
  font-weight: 800;
  color: var(--text-titanium);
  margin: 34px 0 14px;
  padding-left: 12px;
  border-left: 4px solid var(--racing-red);
}

.article-body h3 {
  font-size: 1.16rem;
  font-weight: 700;
  color: var(--tach-yellow);
  margin: 24px 0 10px;
}

.article-body p {
  font-size: 1.02rem;
  color: #CBD5E1;
  margin-bottom: 18px;
  line-height: 1.8;
}

.article-body ul,
.article-body ol {
  margin: 0 0 20px 22px;
  color: #CBD5E1;
}

.article-body li {
  margin-bottom: 8px;
  line-height: 1.7;
}

.telemetry-callout {
  background: rgba(16, 18, 22, 0.75);
  border: 1px solid var(--border-chassis);
  border-left: 4px solid var(--tach-yellow);
  padding: 20px 24px;
  margin: 26px 0;
}

.article-cta-banner {
  margin-top: 38px;
  padding: 28px;
  background: linear-gradient(135deg, rgba(225, 29, 72, 0.16), rgba(24, 28, 36, 0.95));
  border: 1px solid var(--racing-red);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

/* Sitemap List Styling */
.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.sitemap-box {
  background: var(--bg-pitwall);
  border: 1px solid var(--border-chassis);
  padding: 26px;
}

.sitemap-box h2 {
  font-size: 1.25rem;
  margin-bottom: 16px;
  color: var(--tach-yellow);
  border-bottom: 1px solid var(--border-chassis);
  padding-bottom: 10px;
}

.sitemap-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* Footer (Strict 4 Links Only) */
.site-footer {
  background: #0B0D10;
  border-top: 2px solid var(--border-chassis);
  padding: 36px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-copy {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}

.footer-links a,
.footer-links a:visited {
  color: var(--tach-yellow);
  font-size: 0.92rem;
  font-weight: 600;
  text-decoration: none;
}

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

/* Responsive Design & Rule 7 Mobile Navigation (Never display:none on nav) */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }
  .telemetry-grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  .podium-grid {
    grid-template-columns: 1fr;
  }
  .podium-card.pole-position {
    transform: none;
  }
}

@media (max-width: 768px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }
  .main-nav {
    display: flex;
    width: 100%;
    gap: 8px;
    flex-wrap: wrap;
  }
  .main-nav a,
  .main-nav a:visited {
    flex: 1 1 auto;
    text-align: center;
    padding: 9px 12px;
    font-size: 0.86rem;
    background: var(--bg-pitwall-elevated);
    border: 1px solid var(--border-chassis);
  }
  .telemetry-grid-4,
  .reviews-grid,
  .hub-cards-grid,
  .sitemap-grid {
    grid-template-columns: 1fr;
  }
  .sector-readout-bar {
    grid-template-columns: 1fr;
  }
  .article-container {
    padding: 26px 20px;
  }
  .footer-inner {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
}