:root {
  --bg:      #050508;
  --s1:      #0c0c12;
  --s2:      #111118;
  --s3:      #181820;
  --b1:      #1e1e2e;
  --b2:      #2a2a3e;
  --b3:      #383852;

  --p:       #6366f1;
  --p-dim:   rgba(99,102,241,.15);
  --p-glow:  rgba(99,102,241,.3);

  --g:       #10b981;
  --g-dim:   rgba(16,185,129,.12);
  --g-glow:  rgba(16,185,129,.25);

  --y:       #f59e0b;
  --r:       #ef4444;

  --t:       #e2e2f0;
  --t2:      #6b6b8a;
  --t3:      #2e2e48;

  --mono:    'JetBrains Mono', monospace;
  --sans:    'DM Sans', sans-serif;
  --radius:  10px;
}

/* ── RESET ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--t);
  font-family: var(--sans);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
}

/* ── BACKGROUND FX ── */
.noise {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  opacity: .025;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
.orb {
  position: fixed; border-radius: 50%; pointer-events: none; z-index: 0;
  filter: blur(80px);
}
.orb-1 { width: 600px; height: 400px; top: -150px; left: -100px; background: rgba(99,102,241,.07); }
.orb-2 { width: 400px; height: 400px; bottom: 10%; right: -100px; background: rgba(16,185,129,.05); }
.orb-3 { width: 300px; height: 300px; top: 40%; left: 40%; background: rgba(99,102,241,.04); }

/* ── LAYOUT ── */
.layout { position: relative; z-index: 1; }
.section {
  max-width: 900px;
  margin: 0 auto;
  padding: 80px 24px;
}
.section + .section { padding-top: 0; }

/* ── NAV ── */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(5,5,8,.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--b1);
}
.nav-inner {
  max-width: 960px; margin: 0 auto;
  padding: 0 24px; height: 56px;
  display: flex; align-items: center; gap: 12px;
}
.nav-logo {
  display: flex; align-items: center; gap: 8px;
  text-decoration: none; color: var(--t);
  font-weight: 700; font-size: 15px;
}
.nav-logo-icon { font-size: 18px; color: var(--p); line-height: 1; }
.nav-version {
  font-family: var(--mono); font-size: 10px;
  color: var(--t2); background: var(--s2);
  border: 1px solid var(--b1); padding: 1px 6px; border-radius: 4px;
}
.nav-links {
  margin-left: auto; display: flex; align-items: center; gap: 4px;
}
.nav-link {
  font-family: var(--mono); font-size: 11px; color: var(--t2);
  text-decoration: none; padding: 6px 12px; border-radius: 6px;
  transition: all .15s; white-space: nowrap;
}
.nav-link:hover { color: var(--t); background: var(--s2); }
.nav-link-gh {
  display: flex; align-items: center; gap: 6px;
  background: var(--s2); border: 1px solid var(--b2); color: var(--t2);
}
.nav-link-gh:hover { border-color: var(--p); color: var(--p); background: var(--p-dim); }

.nav-mobile-toggle {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: 4px; margin-left: auto;
}
.nav-mobile-toggle span {
  display: block; width: 22px; height: 2px;
  background: var(--t2); border-radius: 2px; transition: all .2s;
}
.nav-mobile-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-mobile-toggle.open span:nth-child(2) { opacity: 0; }
.nav-mobile-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.nav-mobile-menu {
  display: none; flex-direction: column;
  padding: 12px 24px 16px; border-top: 1px solid var(--b1);
  background: rgba(5,5,8,.95);
}
.nav-mobile-menu.open { display: flex; }
.nav-mobile-link {
  font-family: var(--mono); font-size: 13px; color: var(--t2);
  text-decoration: none; padding: 12px 0;
  border-bottom: 1px solid var(--b1); transition: color .15s;
}
.nav-mobile-link:last-child { border-bottom: none; }
.nav-mobile-link:hover { color: var(--g); }

/* ── HERO ── */
.hero {
  max-width: 900px; margin: 0 auto;
  padding: 100px 24px 80px;
}
.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--mono); font-size: 11px; color: var(--g);
  background: var(--g-dim); border: 1px solid rgba(16,185,129,.2);
  padding: 5px 14px; border-radius: 20px; margin-bottom: 24px;
  letter-spacing: .5px;
}
.dot-pulse {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--g); display: inline-block;
  animation: pulse 1.8s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: .4; transform: scale(.7); }
}
.hero-title {
  font-family: 'Instrument Serif', serif;
  font-size: clamp(40px, 6.5vw, 76px);
  font-weight: 400;
  letter-spacing: -1px;
  line-height: 1.05;
  margin-bottom: 20px;
}
.hero-title-accent {
  font-style: italic;
  background: linear-gradient(90deg, var(--p), #818cf8, var(--g));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* hero byline */
.hero-byline {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  font-family: var(--mono); font-size: 11px; color: var(--t2);
  margin-bottom: 28px;
}
.hero-byline-name {
  color: var(--g); font-weight: 500; text-decoration: none;
  transition: opacity .15s;
}
.hero-byline-name:hover { opacity: .7; }
.hero-byline-dot { color: var(--t3); }
.hero-desc {
  font-family: var(--mono); font-size: 13px; color: var(--t2);
  line-height: 1.8; max-width: 520px; margin-bottom: 32px;
}
.hero-actions {
  display: flex; align-items: center; gap: 12px;
  flex-wrap: wrap; margin-bottom: 48px;
}

/* ── BUTTONS ── */
.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--p); color: #fff;
  font-family: var(--sans); font-size: 13px; font-weight: 700;
  padding: 11px 24px; border-radius: var(--radius); border: none;
  cursor: pointer; text-decoration: none;
  box-shadow: 0 4px 20px var(--p-glow);
  transition: all .18s;
}
.btn-primary:hover { filter: brightness(1.15); transform: translateY(-1px); box-shadow: 0 6px 24px var(--p-glow); }
.btn-primary:active { transform: translateY(0); }

.btn-ghost {
  display: inline-flex; align-items: center; gap: 8px;
  background: transparent; color: var(--t2);
  font-family: var(--sans); font-size: 13px; font-weight: 600;
  padding: 11px 24px; border-radius: var(--radius);
  border: 1px solid var(--b2); cursor: pointer; text-decoration: none;
  transition: all .18s;
}
.btn-ghost:hover { border-color: var(--b3); color: var(--t); background: var(--s2); }

/* ── HERO STATS ── */
.hero-stats {
  display: flex; align-items: center; flex-wrap: wrap; gap: 0;
  background: var(--s1); border: 1px solid var(--b1);
  border-radius: 12px; padding: 16px 24px;
  max-width: 600px;
}
.stat { display: flex; flex-direction: column; padding: 4px 20px; }
.stat:first-child { padding-left: 0; }
.stat-n { font-family: var(--mono); font-size: 22px; font-weight: 700; color: var(--g); }
.stat-l { font-family: var(--mono); font-size: 10px; color: var(--t2); margin-top: 2px; }
.stat-divider { width: 1px; height: 36px; background: var(--b2); flex-shrink: 0; }

/* ── SECTION COMMON ── */
.section-label {
  font-family: var(--mono); font-size: 10px; color: var(--p);
  text-transform: uppercase; letter-spacing: 2.5px;
  margin-bottom: 10px; opacity: .8;
}
.section-title {
  font-size: clamp(24px, 4vw, 36px); font-weight: 800;
  letter-spacing: -1px; margin-bottom: 12px;
}
.section-desc {
  font-family: var(--mono); font-size: 12px; color: var(--t2);
  line-height: 1.8; margin-bottom: 32px; max-width: 560px;
}

/* ── STEPS GRID ── */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}
.step-card {
  background: var(--s1); border: 1px solid var(--b1);
  border-radius: 12px; padding: 20px 16px;
  position: relative; overflow: hidden;
  transition: border-color .2s, transform .2s;
}
.step-card:hover { border-color: var(--b2); transform: translateY(-2px); }
.step-num {
  font-family: var(--mono); font-size: 10px; color: var(--p);
  opacity: .5; margin-bottom: 10px; letter-spacing: 1px;
}
.step-icon { font-size: 22px; margin-bottom: 10px; }
.step-card h3 { font-size: 14px; font-weight: 700; margin-bottom: 6px; }
.step-card p { font-family: var(--mono); font-size: 11px; color: var(--t2); line-height: 1.6; }
kbd {
  font-family: var(--mono); font-size: 10px;
  background: var(--s3); border: 1px solid var(--b2);
  padding: 1px 5px; border-radius: 4px; color: var(--t);
}
code {
  font-family: var(--mono); font-size: 11px;
  color: var(--p); background: var(--p-dim);
  padding: 1px 5px; border-radius: 3px;
}

/* ── SCRIPT CARD ── */
.script-section { padding-top: 0; }
.script-card {
  background: var(--s1); border: 1px solid var(--b1);
  border-radius: 14px; overflow: hidden;
  box-shadow: 0 0 0 1px rgba(99,102,241,.06), 0 32px 80px rgba(0,0,0,.5);
  margin-bottom: 16px;
}
.script-card-header {
  background: var(--s2); border-bottom: 1px solid var(--b1);
  padding: 12px 16px; display: flex; align-items: center; gap: 10px;
}
.traffic-lights { display: flex; gap: 5px; flex-shrink: 0; }
.tl {
  width: 10px; height: 10px; border-radius: 50%;
  transition: opacity .2s;
}
.tl-r { background: #ff5f56; }
.tl-y { background: #ffbd2e; }
.tl-g { background: #27c93f; }
.script-filename {
  font-family: var(--mono); font-size: 11px; color: var(--t2);
  flex: 1; text-align: center;
}
.script-header-actions { display: flex; align-items: center; gap: 10px; }
.script-lines { font-family: var(--mono); font-size: 10px; color: var(--t3); }
.copy-btn {
  display: flex; align-items: center; gap: 6px;
  background: var(--p); color: #fff;
  font-family: var(--sans); font-size: 12px; font-weight: 700;
  padding: 7px 16px; border-radius: 7px; border: none;
  cursor: pointer; transition: all .15s;
  box-shadow: 0 2px 10px var(--p-glow);
}
.copy-btn:hover { filter: brightness(1.15); transform: translateY(-1px); }
.copy-btn.copied { background: var(--g); box-shadow: 0 2px 10px var(--g-glow); }
.script-body { overflow: hidden; }
pre {
  padding: 20px 24px; overflow-x: auto;
  font-family: var(--mono); font-size: 12px; line-height: 1.85;
  color: #7878b0; white-space: pre; tab-size: 2;
  user-select: all; cursor: text;
  max-height: 380px; overflow-y: auto;
}
pre::-webkit-scrollbar { width: 4px; height: 4px; }
pre::-webkit-scrollbar-thumb { background: var(--b2); border-radius: 2px; }

/* ── ANSWER KEY ── */
.ak-wrap { margin-top: 0; }
.ak-toggle {
  display: flex; align-items: center; gap: 8px;
  width: 100%; background: none; border: 1px solid var(--b1);
  border-radius: 8px; color: var(--t2);
  font-family: var(--mono); font-size: 11px;
  padding: 10px 16px; cursor: pointer; transition: all .15s;
}
.ak-toggle:hover { border-color: var(--b2); color: var(--t); }
.ak-body { display: none; margin-top: 10px; }
.ak-body.open { display: block; }
.ak-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 6px;
}
.ak-row {
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  padding: 9px 14px; background: var(--s1); border: 1px solid var(--b1);
  border-radius: 8px; font-size: 12px;
}
.ak-q { color: var(--t2); flex: 1; font-family: var(--mono); font-size: 11px; }
.ak-a {
  font-family: var(--mono); font-size: 11px; color: var(--g);
  background: var(--g-dim); border: 1px solid rgba(16,185,129,.2);
  padding: 2px 10px; border-radius: 20px; white-space: nowrap; flex-shrink: 0;
}

/* ── MOBILE SECTION ── */
.mobile-options {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 12px; margin-bottom: 20px;
}
.mobile-card {
  background: var(--s1); border: 1px solid var(--b1);
  border-radius: 12px; padding: 20px;
  transition: border-color .2s, transform .2s;
}
.mobile-card:hover { border-color: var(--b2); transform: translateY(-2px); }
.mobile-card-best {
  border-color: rgba(16,185,129,.3);
  background: rgba(16,185,129,.03);
  position: relative;
}
.mobile-card-tag {
  position: absolute; top: -1px; left: 16px;
  font-family: var(--mono); font-size: 9px; font-weight: 700;
  background: var(--g); color: #000;
  padding: 2px 8px; border-radius: 0 0 6px 6px;
  letter-spacing: .5px; text-transform: uppercase;
}
.mobile-card-icon { font-size: 28px; margin-bottom: 12px; margin-top: 8px; }
.mobile-card h3 { font-size: 14px; font-weight: 700; margin-bottom: 8px; }
.mobile-card p { font-family: var(--mono); font-size: 11px; color: var(--t2); line-height: 1.65; margin-bottom: 12px; }
.mobile-link {
  font-family: var(--mono); font-size: 11px; color: var(--g);
  text-decoration: none; transition: opacity .15s;
}
.mobile-link:hover { opacity: .7; }
.mobile-note {
  display: flex; gap: 12px; align-items: flex-start;
  background: var(--s2); border: 1px solid var(--b1);
  border-left: 3px solid var(--p); border-radius: 8px;
  padding: 14px 16px; color: var(--t2);
}
.mobile-note svg { color: var(--p); flex-shrink: 0; margin-top: 2px; }
.mobile-note p { font-family: var(--mono); font-size: 11px; line-height: 1.7; }

/* ── SECURITY ── */
.security-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 12px; margin-bottom: 16px;
}
.security-card {
  background: var(--s1); border: 1px solid var(--b1);
  border-radius: 12px; padding: 20px;
}
.security-safe { border-color: rgba(16,185,129,.25); }
.security-danger { border-color: rgba(239,68,68,.2); }
.security-icon { font-size: 24px; margin-bottom: 12px; }
.security-card h3 { font-size: 14px; font-weight: 700; margin-bottom: 10px; }
.security-card ul { list-style: none; display: flex; flex-direction: column; gap: 6px; }
.security-card li {
  font-family: var(--mono); font-size: 11px; color: var(--t2);
  padding-left: 16px; position: relative; line-height: 1.5;
}
.security-card li::before {
  content: '→'; position: absolute; left: 0;
  color: var(--t3);
}
.security-verify {
  display: flex; gap: 16px; align-items: flex-start;
  background: var(--p-dim); border: 1px solid rgba(99,102,241,.2);
  border-radius: 12px; padding: 18px 20px; margin-bottom: 12px;
}
.security-verify-icon { font-size: 24px; flex-shrink: 0; }
.security-verify h3 { font-size: 14px; font-weight: 700; margin-bottom: 6px; }
.security-verify p { font-family: var(--mono); font-size: 11px; color: var(--t2); line-height: 1.7; }
.security-warning {
  display: flex; gap: 12px; align-items: flex-start;
  background: rgba(245,158,11,.05); border: 1px solid rgba(245,158,11,.2);
  border-radius: 8px; padding: 14px 16px; color: var(--t2);
}
.security-warning svg { color: var(--y); flex-shrink: 0; margin-top: 2px; }
.security-warning p { font-family: var(--mono); font-size: 11px; line-height: 1.7; }
.security-warning strong { color: var(--y); }

/* ── OPEN SOURCE — minimal repo strip ── */
.repo-strip {
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 16px;
  background: var(--s1); border: 1px solid var(--b1);
  border-radius: 12px; padding: 18px 20px;
}
.repo-strip-name {
  display: flex; align-items: center; gap: 8px;
  font-family: var(--mono); font-size: 13px;
}
.repo-owner { color: var(--t2); }
.repo-slash { color: var(--t3); }
.repo-repo  { color: var(--t); font-weight: 700; }
.repo-tag {
  font-family: var(--mono); font-size: 9px;
  background: var(--p-dim); color: var(--p);
  border: 1px solid rgba(99,102,241,.25);
  padding: 2px 8px; border-radius: 20px;
}
.repo-actions { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.repo-btn {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--mono); font-size: 11px; color: var(--t2);
  background: var(--s2); border: 1px solid var(--b2);
  padding: 7px 14px; border-radius: 7px; text-decoration: none;
  transition: all .15s; white-space: nowrap;
}
.repo-btn:hover { border-color: var(--b3); color: var(--t); }
.repo-btn-primary {
  background: var(--p); color: #fff; border-color: var(--p);
  box-shadow: 0 2px 12px var(--p-glow);
  font-family: var(--sans); font-weight: 600;
}
.repo-btn-primary:hover { filter: brightness(1.12); color: #fff; }

/* ── FOOTER ── */
.footer {
  border-top: 1px solid var(--b1);
  padding: 40px 0;
}
.footer-inner {
  max-width: 900px; margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; gap: 20px; flex-wrap: wrap;
}
.footer-brand {
  display: flex; align-items: center; gap: 8px;
  font-weight: 700; font-size: 14px;
}
.footer-version {
  font-family: var(--mono); font-size: 10px; color: var(--t2);
  background: var(--s2); border: 1px solid var(--b1);
  padding: 1px 6px; border-radius: 4px;
}
.footer-note {
  font-family: var(--mono); font-size: 10px; color: var(--t2);
  line-height: 1.7; max-width: 360px;
}
.footer-credit {
  color: var(--g); text-decoration: none;
  transition: opacity .15s;
}
.footer-credit:hover { opacity: .7; }
.footer-links {
  margin-left: auto; display: flex; gap: 4px; flex-wrap: wrap;
}
.footer-links a {
  font-family: var(--mono); font-size: 11px; color: var(--t2);
  text-decoration: none; padding: 5px 10px; border-radius: 5px;
  transition: all .15s;
}
.footer-links a:hover { color: var(--t); background: var(--s2); }

/* ── TOAST ── */
.toast {
  position: fixed; bottom: 20px; left: 50%;
  transform: translateX(-50%) translateY(60px);
  display: flex; align-items: center; gap: 8px;
  background: var(--g); color: #000; font-family: var(--mono);
  font-size: 12px; font-weight: 700;
  padding: 10px 20px; border-radius: 30px;
  opacity: 0; transition: all .22s cubic-bezier(.4,0,.2,1);
  pointer-events: none; z-index: 9999; white-space: nowrap;
  box-shadow: 0 8px 30px var(--g-glow);
}
.toast.show { transform: translateX(-50%) translateY(0); opacity: 1; }

/* ── ENTRANCE ANIMATIONS ── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}
.hero-eyebrow  { animation: fadeUp .5s ease both; animation-delay: .1s; }
.hero-title    { animation: fadeUp .5s ease both; animation-delay: .2s; }
.hero-desc     { animation: fadeUp .5s ease both; animation-delay: .3s; }
.hero-actions  { animation: fadeUp .5s ease both; animation-delay: .4s; }
.hero-stats    { animation: fadeUp .5s ease both; animation-delay: .5s; }

/* ══════════════════════════════════════
   RESPONSIVE BREAKPOINTS
══════════════════════════════════════ */

/* Tablet */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-mobile-toggle { display: flex; }

  .hero { padding: 64px 20px 56px; }
  .hero-title { letter-spacing: -1.5px; }

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

  .mobile-options { grid-template-columns: 1fr; }

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

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

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

  .hero-stats {
    gap: 0;
    justify-content: flex-start;
  }
  .stat { padding: 4px 14px; }

  .repo-strip { flex-direction: column; align-items: flex-start; }
  .repo-actions { width: 100%; }

  .footer-inner { flex-direction: column; align-items: flex-start; gap: 16px; }
  .footer-links { margin-left: 0; }
}

/* Mobile */
@media (max-width: 480px) {
  .section { padding: 48px 16px; }
  .hero { padding: 48px 16px 48px; }

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

  .hero-actions { flex-direction: column; align-items: flex-start; }
  .btn-primary, .btn-ghost { width: 100%; justify-content: center; }

  .hero-stats {
    flex-wrap: wrap;
    padding: 14px 16px;
  }
  .stat { padding: 8px 12px; }
  .stat-divider { display: none; }

  .script-header-actions { gap: 6px; }
  .script-lines { display: none; }
  .copy-btn span { display: none; }
  .copy-btn { padding: 7px 12px; }

  .security-verify { flex-direction: column; }
  .repo-card-header { gap: 6px; }
  .repo-license { display: none; }
  .ft-desc { display: none; }
}