/* === Landing Page Styles === */
*,*::before,*::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

:root {
  --accent: #6366f1;
  --accent-dark: #4f46e5;
  --accent-light: #c7d2fe;
  --accent-bg: #eef2ff;
  --text: #1e293b;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --bg: #ffffff;
  --bg-alt: #f8fafc;
  --bg-card: #ffffff;
  --border: #e2e8f0;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,.08);
  --shadow-lg: 0 12px 40px rgba(0,0,0,.1);
  --radius: 16px;
}

/* === Dark Mode === */
html.dark {
  --accent: #818cf8;
  --accent-dark: #6366f1;
  --accent-light: #4338ca;
  --accent-bg: rgba(99,102,241,.12);
  --text: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --bg: #0f172a;
  --bg-alt: #1e293b;
  --bg-card: #1e293b;
  --border: #334155;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.2);
  --shadow-md: 0 4px 16px rgba(0,0,0,.3);
  --shadow-lg: 0 12px 40px rgba(0,0,0,.4);
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-dark); }

/* === Layout === */
.container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

/* === Nav === */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(255,255,255,.85); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  box-shadow: none; transition: box-shadow .3s;
}
.nav.nav-scrolled { box-shadow: 0 2px 16px rgba(0,0,0,.08); }
.nav-inner {
  display: flex; align-items: center;
  height: 60px;
}
.nav-logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 18px; font-weight: 800; color: var(--text);
  letter-spacing: -.3px; text-decoration: none; margin-right: auto;
}
.nav-logo svg { flex-shrink: 0; }
.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a {
  font-size: 14px; font-weight: 500; color: var(--text-secondary);
  transition: color .15s;
}
.nav-links a:hover { color: var(--accent); }
.nav-links a.nav-cta {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 20px; font-size: 13px; font-weight: 600;
  background: linear-gradient(135deg, #4f46e5, #4f46e5); color: #fff; border-radius: 10px;
  transition: box-shadow .2s, transform .2s, background .3s; border: none; cursor: pointer;
}
.nav-links a.nav-cta:hover { background: linear-gradient(135deg, #6366f1, #7c3aed, #ec4899); box-shadow: 0 4px 16px rgba(99,102,241,.4); transform: translateY(-1px); }

/* === Dark Mode Toggle === */
.dark-toggle {
  display: flex; align-items: center; justify-content: center;
  width: 36px; height: 36px; border-radius: 10px;
  border: 1.5px solid var(--border); background: var(--bg-card);
  color: var(--text-secondary); cursor: pointer;
  transition: all .2s; flex-shrink: 0;
  margin-left: 8px;
}
.dark-toggle:hover { border-color: var(--accent-light); color: var(--accent); background: var(--accent-bg); }
.dark-toggle .icon-moon { display: none; }
html.dark .dark-toggle .icon-sun { display: none; }
html.dark .dark-toggle .icon-moon { display: block; }

/* === Hero === */
.hero {
  padding: 140px 0 40px; text-align: center;
  background: linear-gradient(180deg, var(--accent-bg) 0%, var(--bg) 100%);
  overflow: hidden;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 14px; font-size: 12px; font-weight: 600;
  color: var(--accent); background: var(--bg-card);
  border: 1px solid var(--accent-light); border-radius: 20px;
  margin-bottom: 20px;
}
.hero h1 {
  font-size: clamp(36px, 5vw, 56px); font-weight: 800;
  line-height: 1.1; letter-spacing: -.02em;
  margin-bottom: 16px;
}
.hero h1 span { color: var(--accent); }
.hero p {
  font-size: clamp(16px, 2vw, 19px); color: var(--text-secondary);
  max-width: 560px; margin: 0 auto 32px; line-height: 1.6;
}
.hero-actions { display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; }

.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 32px; font-size: 15px; font-weight: 600;
  background: linear-gradient(135deg, #4f46e5, #4f46e5); color: #fff; border-radius: 12px;
  transition: box-shadow .2s, transform .2s, background .3s; border: none; cursor: pointer;
  text-decoration: none;
}
.btn-primary:hover { background: linear-gradient(135deg, #6366f1, #7c3aed, #ec4899); box-shadow: 0 6px 24px rgba(99,102,241,.4); transform: translateY(-2px); color: #fff; }
.btn-secondary {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 32px; font-size: 15px; font-weight: 600;
  background: var(--bg-card); color: var(--text); border-radius: 12px;
  border: 1.5px solid var(--border); transition: all .2s;
  cursor: pointer; text-decoration: none;
}
.btn-secondary:hover { border-color: var(--accent-light); color: var(--accent); transform: translateY(-2px); }

/* === Hero Plasmid Animation === */
.hero-visual {
  margin-top: 60px; display: flex; justify-content: center;
  position: relative;
}
.hero-svg-wrap {
  width: clamp(280px, 40vw, 420px); height: clamp(280px, 40vw, 420px);
  filter: drop-shadow(0 8px 30px rgba(99,102,241,.15));
}
.hero-svg-wrap svg { width: 100%; height: 100%; }
.hero-ring {
  transform-origin: 450px 450px;
  animation: heroSpin 60s linear infinite;
}
@keyframes heroSpin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .hero-ring { animation: none; } }

.hero-svg-wrap { position: relative; }
.hero-spin-toggle {
  position: absolute; bottom: 12%; right: 12%; z-index: 2;
  width: 30px; height: 30px; border-radius: 50%;
  border: 1.5px solid var(--border); background: var(--bg-card);
  color: var(--text-muted); cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  opacity: 0; transition: opacity .2s, border-color .2s, color .2s;
}
.hero-svg-wrap:hover .hero-spin-toggle { opacity: 1; }
.hero-spin-toggle:focus-visible { opacity: 1; outline: 2px solid var(--accent); outline-offset: 2px; }
.hero-spin-toggle:hover { border-color: var(--accent); color: var(--accent); }
.hero-spin-toggle .icon-play { display: none; }
.hero-spin-toggle.paused .icon-pause { display: none; }
.hero-spin-toggle.paused .icon-play { display: block; }

/* === Section Shared === */
.section-header { text-align: center; margin-bottom: 48px; }
.section-header h2 {
  font-size: clamp(26px, 3.5vw, 36px); font-weight: 800;
  letter-spacing: -.02em; margin-bottom: 12px;
}
.section-header p { font-size: 16px; color: var(--text-secondary); max-width: 520px; margin: 0 auto; }

/* === Features Grid === */
.features { padding: 80px 0; background: var(--bg); }
.features-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}
.feature-card {
  padding: 28px 24px; background: var(--bg-alt); border: 1px solid var(--border);
  border-radius: var(--radius); transition: all .2s;
}
.feature-card:hover { border-color: var(--accent-light); box-shadow: var(--shadow-md); transform: translateY(-3px); }
.feature-icon {
  width: 40px; height: 40px; border-radius: 10px;
  background: var(--accent-bg); color: var(--accent);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 14px;
}
.feature-card h3 { font-size: 15px; font-weight: 700; margin-bottom: 6px; }
.feature-card p { font-size: 13px; color: var(--text-secondary); line-height: 1.5; }

/* === Examples Gallery === */
.examples { padding: 80px 0; background: var(--bg-alt); }
.examples-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.example-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
  transition: all .2s;
}
.example-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); }
.example-visual {
  padding: 32px; display: flex; justify-content: center; align-items: center;
  background: linear-gradient(135deg, var(--bg-alt), var(--bg-card));
  min-height: 260px;
}
.example-visual svg, .example-visual img { width: 220px; height: 220px; object-fit: contain; }
.example-info { padding: 20px 24px; }
.example-info h3 { font-size: 15px; font-weight: 700; margin-bottom: 4px; }
.example-info p { font-size: 13px; color: var(--text-secondary); line-height: 1.5; }
.example-tags { display: flex; gap: 6px; margin-top: 10px; flex-wrap: wrap; }
.example-tag {
  font-size: 11px; font-weight: 600; padding: 3px 8px;
  border-radius: 6px; background: var(--accent-bg); color: var(--accent);
}

/* === How It Works === */
.how-it-works { padding: 80px 0; background: var(--bg); }
.steps {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 32px; counter-reset: step;
}
.step { text-align: center; position: relative; }
.step-num {
  width: 48px; height: 48px; border-radius: 50%;
  background: var(--accent); color: #fff;
  font-size: 20px; font-weight: 800;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 16px;
}
.step h3 { font-size: 16px; font-weight: 700; margin-bottom: 6px; }
.step p { font-size: 13px; color: var(--text-secondary); max-width: 260px; margin: 0 auto; }

/* === CTA Banner === */
.cta-banner {
  padding: 80px 0; text-align: center;
  background: linear-gradient(135deg, #4f46e5, #7c3aed);
  color: #fff;
}
.cta-banner h2 { font-size: clamp(26px, 3.5vw, 36px); font-weight: 800; margin-bottom: 12px; }
.cta-banner p { font-size: 16px; opacity: .85; margin-bottom: 28px; }
.btn-white {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 32px; font-size: 15px; font-weight: 600;
  background: #fff; color: var(--accent-dark); border-radius: 12px;
  transition: all .2s; border: none; cursor: pointer;
  text-decoration: none;
}
.btn-white:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0,0,0,.2); color: var(--accent-dark); }

/* === Footer === */
.footer {
  padding: 40px 0; border-top: 1px solid var(--border);
  text-align: center; font-size: 13px; color: var(--text-muted);
}
.footer-links { display: flex; justify-content: center; gap: 24px; margin-bottom: 8px; }
.footer-links a { color: var(--text-secondary); font-weight: 500; }
.footer-links a:hover { color: var(--accent); }
.footer-legal { display: flex; justify-content: center; align-items: center; gap: 6px; margin-top: 16px; font-size: 11px; }
.footer-legal a { color: var(--text-muted); font-weight: 400; }
.footer-legal a:hover { color: var(--text-secondary); }
.footer-legal-sep { color: var(--text-muted); opacity: .4; }
.footer-cite {
  margin: 16px auto 12px; max-width: 560px; padding: 12px 16px;
  background: var(--bg-alt); border: 1px solid var(--border); border-radius: 8px;
  text-align: left;
}
.footer-cite .cite-label { font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: .5px; color: var(--text-muted); margin-bottom: 4px; }
.footer-cite .cite-text { font-size: 12px; color: var(--text-secondary); line-height: 1.5; font-family: 'Courier New', monospace; user-select: all; cursor: text; }
.footer-license {
  max-width: 560px; margin: 0 auto 16px; font-size: 12px; color: var(--text-muted); line-height: 1.6;
}
.footer-license strong { color: var(--text-secondary); }
.footer-author { font-size: 12px; color: var(--text-muted); margin-top: 4px; }

/* === Dark Mode Overrides === */
html.dark .nav { background: rgba(15,23,42,.85); }
html.dark .nav.nav-scrolled { box-shadow: 0 2px 16px rgba(0,0,0,.3); }
html.dark .hero { background: linear-gradient(180deg, rgba(99,102,241,.08) 0%, var(--bg) 100%); }
html.dark .example-visual { background: linear-gradient(135deg, #1a1f35, #1e293b); }
html.dark .example-visual img { background: #fff; border-radius: 12px; padding: 12px; }
html.dark .cta-banner { background: linear-gradient(135deg, #312e81, #4c1d95); }
html.dark .btn-white { background: #e2e8f0; color: #312e81; }
html.dark .btn-white:hover { background: #fff; }
html.dark .nav-logo { color: var(--text); }
html.dark .example-tag { background: rgba(99,102,241,.15); }

/* === Responsive === */
/* === Hamburger button (hidden on desktop) === */
.nav-hamburger { display: none; }

@media (max-width: 768px) {
  .container { padding: 0 16px; }
  .nav-inner { padding: 0 16px; }
  .nav-hamburger {
    display: flex; flex-direction: column; justify-content: center; gap: 5px;
    width: 36px; height: 36px; padding: 8px 6px;
    background: none; border: 1.5px solid var(--border); border-radius: 8px;
    cursor: pointer; order: 3;
  }
  .nav-hamburger span {
    display: block; width: 100%; height: 2px; background: var(--text);
    border-radius: 1px; transition: transform .2s, opacity .2s;
  }
  .nav-hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-hamburger.open span:nth-child(2) { opacity: 0; }
  .nav-hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  .nav-links {
    display: none; position: absolute; top: 60px; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: var(--bg); border-bottom: 1px solid var(--border);
    box-shadow: 0 8px 24px rgba(0,0,0,.1); padding: 8px 16px;
  }
  .nav-links.nav-open { display: flex; }
  .nav-links a:not(.nav-cta) { padding: 12px 8px; font-size: 15px; border-bottom: 1px solid var(--border); }
  .nav-links a:not(.nav-cta):last-of-type { border-bottom: none; }
  .dark-toggle { order: 2; margin-left: 0; margin-right: 6px; }
  .nav-links a.nav-cta { margin: 8px 8px; text-align: center; justify-content: center; }
  .hero { padding: 100px 0 32px; }
  .hero-visual { margin-top: 32px; }
  .hero-svg-wrap { width: clamp(240px, 65vw, 340px); height: clamp(240px, 65vw, 340px); }
  .hero-actions { gap: 10px; }
  .btn-primary, .btn-secondary { padding: 12px 24px; font-size: 14px; }
  .features, .examples, .how-it-works { padding: 48px 0; }
  .features-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .feature-card { padding: 20px 16px; }
  .examples-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .steps-grid { grid-template-columns: 1fr; gap: 24px; }
  .cta-banner { padding: 48px 20px; }
  .footer-links { flex-wrap: wrap; gap: 16px; }
  .footer-cite { margin: 12px 16px; }
  .footer-license { margin: 0 16px 12px; }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 28px; }
  .hero p { font-size: 15px; }
  .features-grid { grid-template-columns: 1fr; }
  .examples-grid { grid-template-columns: 1fr; }
  .hero-svg-wrap { width: 240px; height: 240px; }
  .btn-primary, .btn-secondary { padding: 11px 20px; font-size: 13px; width: 100%; justify-content: center; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .section-header h2 { font-size: 24px; }
  .cta-banner h2 { font-size: 22px; }
}