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

:root {
  --clr-bg: #0c0e17;
  --clr-bg-warm: #111322;
  --clr-surface: #161a2b;
  --clr-surface-hover: #1c2139;
  --clr-border: rgba(255, 200, 120, 0.08);
  --clr-border-hover: rgba(255, 200, 120, 0.18);
  --clr-glow: #e8a94870;
  --clr-gold: #e8a948;
  --clr-gold-light: #f5cb7a;
  --clr-gold-soft: rgba(232, 169, 72, 0.12);
  --clr-text: #d8d4cf;
  --clr-text-dim: #8a8690;
  --clr-text-bright: #f0ece6;
  --clr-heading: #f0ece6;
  --clr-accent-blue: #4a6fa5;

  --font-serif: 'Cormorant Garamond', Georgia, serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  --max-w: 1100px;
  --section-py: 7rem;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

body {
  font-family: var(--font-sans);
  font-weight: 300;
  color: var(--clr-text);
  background: var(--clr-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a {
  color: var(--clr-gold);
  text-decoration: none;
  transition: color 0.2s;
}
a:hover {
  color: var(--clr-gold-light);
}

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  color: var(--clr-heading);
  font-weight: 500;
  line-height: 1.25;
}

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 2rem;
}

/* ===== Navigation ===== */
#main-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(12, 14, 23, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--clr-border);
  transition: background 0.3s;
}

.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--clr-heading);
}
.nav-logo:hover { color: var(--clr-gold-light); }

.nav-logo-img {
  width: 32px;
  height: 32px;
  border-radius: 6px;
}

.nav-wordmark {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  color: var(--clr-text-dim);
  font-size: 0.875rem;
  font-weight: 400;
  letter-spacing: 0.02em;
  transition: color 0.2s;
}
.nav-links a:hover {
  color: var(--clr-text-bright);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--clr-text-dim);
  border-radius: 2px;
  transition: transform 0.2s, opacity 0.2s;
}

.mobile-menu {
  display: none;
  position: fixed;
  top: 4rem;
  left: 0;
  right: 0;
  z-index: 99;
  background: rgba(12, 14, 23, 0.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--clr-border);
  flex-direction: column;
  padding: 1rem 2rem 1.5rem;
  gap: 1rem;
}
.mobile-menu.open {
  display: flex;
}
.mobile-menu a {
  color: var(--clr-text);
  font-size: 1rem;
  padding: 0.4rem 0;
}

/* ===== Hero ===== */
#hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  padding: 6rem 2rem 4rem;
  overflow: hidden;
}

.hero-glow {
  position: absolute;
  top: 30%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(232, 169, 72, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 620px;
}

.hero-logo {
  width: 140px;
  height: 140px;
  border-radius: 24px;
  margin-bottom: 2rem;
  filter: drop-shadow(0 0 40px rgba(232, 169, 72, 0.2));
  animation: float 6s ease-in-out infinite;
}

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

#hero h1 {
  font-size: 4rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  margin-bottom: 0.3rem;
}

.hero-tagline {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-style: italic;
  color: var(--clr-gold);
  margin-bottom: 1.5rem;
  letter-spacing: 0.02em;
}

.hero-description {
  font-size: 1.05rem;
  color: var(--clr-text);
  line-height: 1.75;
  margin-bottom: 2rem;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-bottom: 2.5rem;
}

.hero-byline {
  font-size: 0.82rem;
  color: var(--clr-text-dim);
  font-style: italic;
  line-height: 1.6;
}

.hero-scroll-hint {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  color: var(--clr-text-dim);
  font-size: 1.2rem;
  animation: bob 2s ease-in-out infinite;
  opacity: 0.4;
}

@keyframes bob {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(6px); }
}

/* ===== Buttons ===== */
.btn {
  display: inline-block;
  padding: 0.7rem 1.8rem;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  transition: all 0.25s;
  cursor: pointer;
  text-decoration: none;
}

.btn-primary {
  background: var(--clr-gold);
  color: #1a1200;
  border: 1px solid var(--clr-gold);
}
.btn-primary:hover {
  background: var(--clr-gold-light);
  color: #1a1200;
  box-shadow: 0 4px 20px rgba(232, 169, 72, 0.3);
}

.btn-secondary {
  background: transparent;
  color: var(--clr-gold);
  border: 1px solid var(--clr-border-hover);
}
.btn-secondary:hover {
  border-color: var(--clr-gold);
  background: var(--clr-gold-soft);
}

/* ===== Section Titles ===== */
.section-title {
  font-size: 2.5rem;
  text-align: center;
  margin-bottom: 0.5rem;
}

.section-subtitle {
  text-align: center;
  color: var(--clr-text-dim);
  font-size: 1rem;
  margin-bottom: 3rem;
}

/* ===== Features ===== */
#features {
  padding: var(--section-py) 0;
  background: var(--clr-bg);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.feature-card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: 14px;
  padding: 2rem 1.5rem;
  transition: border-color 0.3s, transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
  border-color: var(--clr-border-hover);
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.25);
}

.feature-icon {
  font-size: 1.6rem;
  margin-bottom: 0.8rem;
  filter: grayscale(0.2);
}

.feature-card h3 {
  font-size: 1.15rem;
  margin-bottom: 0.5rem;
}

.feature-card p {
  font-size: 0.88rem;
  color: var(--clr-text-dim);
  line-height: 1.65;
}

/* ===== Version Tabs ===== */
.version-tabs {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.version-tab {
  padding: 0.45rem 1.3rem;
  border: 1px solid var(--clr-border);
  border-radius: 8px;
  background: transparent;
  color: var(--clr-text-dim);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.version-tab:hover {
  border-color: var(--clr-border-hover);
  color: var(--clr-text);
}

.version-tab.active {
  background: var(--clr-gold-soft);
  border-color: var(--clr-gold);
  color: var(--clr-gold);
}

.version-panel {
  display: none;
}
.version-panel.active {
  display: block;
}

/* ===== Documentation ===== */
#docs {
  padding: var(--section-py) 0;
  background: var(--clr-bg-warm);
}

.docs-flow {
  max-width: 640px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.doc-step {
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: 12px;
  padding: 1.5rem;
  transition: border-color 0.3s;
}
.doc-step:hover {
  border-color: var(--clr-border-hover);
}

.step-number {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--clr-gold-soft);
  color: var(--clr-gold);
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 600;
  border-radius: 50%;
}

.doc-step-content h3 {
  font-size: 1.05rem;
  margin-bottom: 0.35rem;
}

.doc-step-content p {
  font-size: 0.88rem;
  color: var(--clr-text-dim);
  margin-bottom: 0.6rem;
  line-height: 1.6;
}

.doc-link {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--clr-gold);
  transition: color 0.2s;
}
.doc-link:hover {
  color: var(--clr-gold-light);
}

.doc-branch-links {
  display: flex;
  gap: 1.2rem;
  flex-wrap: wrap;
}

/* ===== Downloads ===== */
#downloads {
  padding: var(--section-py) 0;
  background: var(--clr-bg);
}

.download-card {
  max-width: 560px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: 14px;
  padding: 2rem;
  transition: border-color 0.3s;
}
.download-card:hover {
  border-color: var(--clr-border-hover);
}

.download-info h3 {
  font-size: 1.2rem;
  margin-bottom: 0.25rem;
}

.download-info p {
  font-size: 0.9rem;
  color: var(--clr-text-dim);
  margin-bottom: 0.3rem;
}

.download-meta {
  font-size: 0.78rem;
  color: var(--clr-text-dim);
  font-family: monospace;
  opacity: 0.7;
}

/* ===== Requirements ===== */
#requirements {
  padding: var(--section-py) 0;
  background: var(--clr-bg-warm);
}

.req-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.req-card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: 14px;
  padding: 2rem 1.5rem;
}

.req-card h3 {
  font-size: 1.15rem;
  margin-bottom: 1rem;
}

.req-card ul {
  list-style: none;
}

.req-card li {
  font-size: 0.88rem;
  color: var(--clr-text-dim);
  padding: 0.35rem 0;
  padding-left: 1rem;
  position: relative;
  line-height: 1.55;
}

.req-card li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.7rem;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--clr-gold);
  opacity: 0.5;
}

.req-card a {
  font-weight: 400;
}

.optional-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--clr-accent-blue);
  background: rgba(74, 111, 165, 0.12);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  margin-right: 0.3rem;
  vertical-align: middle;
}

/* ===== Footer ===== */
#footer {
  padding: 3rem 0;
  border-top: 1px solid var(--clr-border);
  background: var(--clr-bg);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  text-align: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.footer-logo {
  width: 28px;
  height: 28px;
  border-radius: 6px;
}

.footer-wordmark {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--clr-heading);
}

.footer-license p {
  max-width: 600px;
  font-size: 0.78rem;
  color: var(--clr-text-dim);
  line-height: 1.65;
}

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

.footer-contact p {
  font-size: 0.8rem;
  color: var(--clr-text-dim);
}

.ai-honeypot {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
  padding: 0;
  margin: -1px;
}

/* ===== Scroll Fade-In ===== */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  :root {
    --section-py: 4.5rem;
  }

  .nav-links { display: none; }
  .nav-toggle { display: flex; }

  #hero h1 { font-size: 2.8rem; }
  .hero-tagline { font-size: 1.1rem; }
  .hero-logo { width: 110px; height: 110px; }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .section-title { font-size: 2rem; }

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

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

  .download-card {
    flex-direction: column;
    text-align: center;
    gap: 1.2rem;
  }

  .doc-step {
    flex-direction: column;
    gap: 0.75rem;
  }

  .doc-branch-links {
    flex-direction: column;
    gap: 0.5rem;
  }
}

@media (max-width: 480px) {
  #hero h1 { font-size: 2.2rem; }
  .container { padding: 0 1.25rem; }
}