:root {
  --bg-petrol: #0d2a33;
  --bg-petrol-dark: #081d24;
  --bg-petrol-card: #133945;
  --coral: #ff6f59;
  --coral-hover: #ff8573;
  --aqua-text: #e0f2f1;
  --aqua-muted: #a7cfcf;
  --border-line: rgba(224, 242, 241, 0.15);
  --border-coral: rgba(255, 111, 89, 0.4);
  --radius-soft: 20px;
  --font-main: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

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

body {
  background-color: var(--bg-petrol);
  color: var(--aqua-text);
  font-family: var(--font-main);
  line-height: 1.6;
  min-height: 100vh;
  padding: 12px;
}

.viewport-frame {
  border: 1px solid var(--border-line);
  border-radius: var(--radius-soft);
  max-width: 1380px;
  margin: 0 auto;
  background-color: var(--bg-petrol-dark);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
  padding: 0 1rem;
}

/* Header & Nav */
.site-header {
  border-bottom: 1px solid var(--border-line);
  padding: 1.5rem 1rem;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  max-width: 1200px;
  margin: 0 auto;
}

.brand-mark {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--coral);
  text-decoration: none;
  text-align: center;
}

.brand-mark span {
  display: block;
  font-size: 0.75rem;
  letter-spacing: 0.25em;
  color: var(--aqua-muted);
  font-family: var(--font-mono);
  font-weight: 400;
}

.main-nav {
  display: flex;
  gap: 1.8rem;
  align-items: center;
}

.main-nav a {
  color: var(--aqua-text);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  position: relative;
  padding: 0.3rem 0;
  transition: color 0.2s ease;
}

.main-nav a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background-color: var(--coral);
  transition: width 0.25s ease;
}

.main-nav a:hover,
.main-nav a.active {
  color: #ffffff;
}

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

/* Buttons */
.btn-primary {
  display: inline-block;
  background-color: var(--coral);
  color: #ffffff;
  padding: 0.85rem 1.8rem;
  border-radius: var(--radius-soft);
  text-decoration: none;
  font-weight: 600;
  letter-spacing: 0.08em;
  font-size: 0.9rem;
  border: 1px solid transparent;
  transition: background-color 0.25s ease, transform 0.2s ease;
  cursor: pointer;
  text-align: center;
}

.btn-primary:hover {
  background-color: var(--coral-hover);
  transform: translateY(-2px);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--aqua-text);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  position: relative;
  padding-bottom: 2px;
}

.btn-secondary::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background-color: var(--coral);
  transition: transform 0.2s ease;
}

.btn-secondary:hover {
  color: #ffffff;
}

.btn-secondary:hover::after {
  transform: scaleY(2);
}

/* Hero Section */
.hero-block {
  padding: 4rem 1.5rem;
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 3rem;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
}

.hero-copy h1 {
  font-size: 2.75rem;
  line-height: 1.2;
  margin-bottom: 1.2rem;
  color: #ffffff;
  font-weight: 700;
}

.hero-lead {
  font-size: 1.15rem;
  color: var(--aqua-muted);
  margin-bottom: 2rem;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 1.8rem;
  flex-wrap: wrap;
}

.hero-visual-cluster {
  position: relative;
  min-height: 440px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.cluster-frame {
  position: absolute;
  border-radius: var(--radius-soft);
  overflow: hidden;
  border: 2px solid var(--border-line);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.45);
  background-color: var(--bg-petrol);
}

.cluster-frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.cluster-1 {
  width: 250px;
  height: 340px;
  top: 10px;
  left: 30px;
  z-index: 2;
  transform: rotate(-3deg);
}

.cluster-2 {
  width: 270px;
  height: 370px;
  top: 30px;
  right: 20px;
  z-index: 3;
  border-color: var(--border-coral);
}

.cluster-3 {
  width: 220px;
  height: 280px;
  bottom: 0px;
  left: 120px;
  z-index: 1;
  opacity: 0.85;
  transform: rotate(4deg);
}

/* Monospace equipment & spec tags */
.mono-spec {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--coral);
  letter-spacing: 0.05em;
  background-color: rgba(255, 111, 89, 0.1);
  padding: 0.2rem 0.5rem;
  border-radius: 6px;
  display: inline-block;
  margin-bottom: 0.5rem;
}

.specs-list {
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  margin-top: 1rem;
  border-left: 2px solid var(--coral);
  padding-left: 1rem;
}

.specs-list li {
  margin-bottom: 0.4rem;
  color: var(--aqua-muted);
}

.specs-list strong {
  color: var(--aqua-text);
}

/* Editorial Split Sections */
.editorial-split {
  padding: 4rem 1.5rem;
  max-width: 1200px;
  margin: 0 auto;
  border-top: 1px solid var(--border-line);
}

.split-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3.5rem;
  align-items: center;
}

.split-container.reverse {
  direction: rtl;
}

.split-container.reverse > * {
  direction: ltr;
}

.split-media {
  position: relative;
}

.media-window {
  border-radius: var(--radius-soft);
  overflow: hidden;
  border: 1px solid var(--border-line);
  background-color: var(--bg-petrol-card);
}

.media-window img {
  display: block;
  width: 100%;
  height: 420px;
  object-fit: cover;
}

.split-text h2, .split-text h3 {
  font-size: 2rem;
  color: #ffffff;
  margin-bottom: 1rem;
  line-height: 1.25;
}

.split-text p {
  color: var(--aqua-muted);
  margin-bottom: 1.2rem;
  font-size: 1rem;
}

/* Badge-Topped Genre Cards */
.genre-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 2.5rem;
}

.genre-card {
  background-color: var(--bg-petrol-card);
  border-radius: var(--radius-soft);
  border: 1px solid var(--border-line);
  overflow: hidden;
  position: relative;
  display: flex;
  flex-direction: column;
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.genre-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-coral);
}

.genre-badge {
  position: absolute;
  top: 15px;
  left: 15px;
  background-color: var(--coral);
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.35rem 0.8rem;
  border-radius: 20px;
  z-index: 2;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
}

.genre-card-img {
  width: 100%;
  height: 220px;
  position: relative;
}

.genre-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.genre-card-body {
  padding: 1.8rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.genre-card-body h3 {
  color: #ffffff;
  font-size: 1.35rem;
  margin-bottom: 0.6rem;
}

.genre-card-body p {
  color: var(--aqua-muted);
  font-size: 0.92rem;
  flex: 1;
  margin-bottom: 1.2rem;
}

/* Diagrams & Vector Visuals */
.diagram-box {
  background: rgba(13, 42, 51, 0.8);
  border: 1px solid var(--border-line);
  border-radius: var(--radius-soft);
  padding: 1.5rem;
  margin: 1.5rem 0;
}

.diagram-svg {
  width: 100%;
  height: auto;
  max-height: 260px;
}

/* Interactive Quiz Section */
.quiz-section {
  background-color: var(--bg-petrol);
  border: 1px solid var(--border-coral);
  border-radius: var(--radius-soft);
  padding: 3rem 2rem;
  margin: 3.5rem auto;
  max-width: 900px;
}

.quiz-header {
  text-align: center;
  margin-bottom: 2rem;
}

.quiz-header h3 {
  font-size: 1.8rem;
  color: #ffffff;
  margin-bottom: 0.5rem;
}

.quiz-step {
  margin-bottom: 1.8rem;
}

.quiz-step label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.6rem;
  color: var(--aqua-text);
}

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

.quiz-opt {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  background-color: var(--bg-petrol-card);
  padding: 1rem;
  border-radius: 12px;
  border: 1px solid var(--border-line);
  cursor: pointer;
  transition: border-color 0.2s, background-color 0.2s;
}

.quiz-opt:hover {
  border-color: var(--coral);
}

.quiz-opt input[type="radio"] {
  accent-color: var(--coral);
}

.quiz-result {
  margin-top: 2rem;
  padding: 1.5rem;
  background-color: rgba(255, 111, 89, 0.12);
  border: 1px solid var(--coral);
  border-radius: var(--radius-soft);
  display: none;
}

.quiz-result.active {
  display: block;
}

/* Narrative prose container for subpages */
.subpage-hero {
  padding: 3rem 1.5rem 2rem;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.subpage-hero h1 {
  font-size: 2.5rem;
  color: #ffffff;
  margin-bottom: 1rem;
}

.prose-block {
  max-width: 900px;
  margin: 2rem auto 4rem;
  padding: 0 1.5rem;
}

.prose-block h2 {
  font-size: 1.6rem;
  color: #ffffff;
  margin: 2.2rem 0 0.8rem;
}

.prose-block p {
  color: var(--aqua-muted);
  margin-bottom: 1.2rem;
  font-size: 1.05rem;
}

.prose-block ul {
  list-style: square inside;
  margin-bottom: 1.5rem;
  color: var(--aqua-muted);
}

.prose-block li {
  margin-bottom: 0.5rem;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border-line);
  padding: 3.5rem 1.5rem 2rem;
  margin-top: 3rem;
  background-color: var(--bg-petrol-dark);
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 2.5rem;
}

.footer-about h4, .footer-col h4 {
  color: #ffffff;
  font-size: 1.1rem;
  margin-bottom: 1rem;
  letter-spacing: 0.05em;
}

.footer-about p {
  color: var(--aqua-muted);
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 1rem;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.6rem;
}

.footer-links a {
  color: var(--aqua-muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s ease;
}

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

.footer-bottom {
  max-width: 1200px;
  margin: 2.5rem auto 0;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-line);
  text-align: center;
  font-size: 0.85rem;
  color: var(--aqua-muted);
}

.footer-bottom a {
  color: var(--aqua-text);
  text-decoration: none;
}

.footer-bottom a:hover {
  color: var(--coral);
}

/* Responsive */
@media (max-width: 900px) {
  .hero-block {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-actions {
    justify-content: center;
  }
  .hero-visual-cluster {
    min-height: 380px;
  }
  .split-container, .split-container.reverse {
    grid-template-columns: 1fr;
    direction: ltr;
  }
  .footer-inner {
    grid-template-columns: 1fr;
  }
  .header-inner {
    flex-direction: column;
    text-align: center;
  }
  .main-nav {
    flex-wrap: wrap;
    justify-content: center;
    gap: 1.2rem;
  }
}

@media (prefers-reduced-motion: reduce){*,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}}