/* FAANG Coding Prep — static site styles. Dark space theme, Mango gold accent. */
:root {
  --navy-950: #05091a;
  --navy-900: #0a1128;
  --navy-800: #111a3a;
  --navy-700: #1a2550;
  --ink: #f4f2ea;
  --ink-soft: #b9c3d8;
  --ink-faint: #8792ac;
  --gold: #ffcd48;
  --gold-deep: #f2b31c;
  --glass: rgba(255, 255, 255, 0.05);
  --glass-strong: rgba(255, 255, 255, 0.09);
  --hairline: rgba(255, 255, 255, 0.12);
  --radius-lg: 28px;
  --radius-md: 18px;
  --max: 1160px;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Inter, Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-rounded: ui-rounded, "SF Pro Rounded", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 88px; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--navy-950);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--gold); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: #ffe08a; }
:focus-visible { outline: 3px solid var(--gold); outline-offset: 3px; border-radius: 6px; }
.skip-link {
  position: absolute; left: 16px; top: -48px; z-index: 100;
  background: var(--gold); color: #111; padding: 10px 16px; border-radius: 10px; font-weight: 700;
}
.skip-link:focus { top: 12px; }
.container { width: min(var(--max), 100% - 40px); margin-inline: auto; }

/* Background: deep space gradient with a soft starfield */
.space {
  position: relative; isolation: isolate;
  background:
    radial-gradient(1200px 600px at 75% -10%, rgba(255, 205, 72, 0.14), transparent 60%),
    radial-gradient(900px 600px at 0% 20%, rgba(90, 120, 255, 0.16), transparent 60%),
    linear-gradient(180deg, var(--navy-900), var(--navy-950));
}
.space::before {
  content: ""; position: absolute; inset: 0; z-index: -1; pointer-events: none; opacity: 0.55;
  background-image:
    radial-gradient(1.4px 1.4px at 12% 18%, #fff 50%, transparent 51%),
    radial-gradient(1.2px 1.2px at 32% 72%, #fff 50%, transparent 51%),
    radial-gradient(1.6px 1.6px at 54% 28%, #ffe7a8 50%, transparent 51%),
    radial-gradient(1.2px 1.2px at 71% 62%, #fff 50%, transparent 51%),
    radial-gradient(1.4px 1.4px at 86% 12%, #bcd2ff 50%, transparent 51%),
    radial-gradient(1.1px 1.1px at 92% 82%, #fff 50%, transparent 51%),
    radial-gradient(1.3px 1.3px at 22% 92%, #ffe7a8 50%, transparent 51%),
    radial-gradient(1.2px 1.2px at 46% 48%, #fff 50%, transparent 51%);
  background-size: 520px 520px;
}

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(8, 13, 32, 0.72);
  backdrop-filter: saturate(160%) blur(16px);
  -webkit-backdrop-filter: saturate(160%) blur(16px);
  border-bottom: 1px solid var(--hairline);
}
.nav { display: flex; align-items: center; gap: 24px; height: 68px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font-weight: 700; letter-spacing: -0.01em; }
.brand img { width: 34px; height: 34px; border-radius: 9px; }
.nav-links { display: flex; gap: 22px; margin-left: auto; list-style: none; padding: 0; margin-block: 0; }
.nav-links a { color: var(--ink-soft); text-decoration: none; font-size: 0.95rem; font-weight: 500; }
.nav-links a:hover { color: var(--ink); }
@media (max-width: 720px) { .nav-links { display: none; } .nav .btn { margin-left: auto; } }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  min-height: 48px; padding: 0 22px; border-radius: 999px;
  font-weight: 700; font-size: 1rem; text-decoration: none; white-space: nowrap;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}
.btn-primary { background: linear-gradient(180deg, #ffd766, var(--gold-deep)); color: #1a1405; box-shadow: 0 10px 30px rgba(255, 196, 64, 0.28); }
.btn-primary:hover { color: #1a1405; transform: translateY(-1px); box-shadow: 0 14px 36px rgba(255, 196, 64, 0.38); }
.btn-small { min-height: 40px; padding: 0 16px; font-size: 0.92rem; }
.btn-ghost { color: var(--ink); background: var(--glass); border: 1px solid var(--hairline); }
.btn-ghost:hover { color: var(--ink); background: var(--glass-strong); }
.store-btn { min-height: 58px; padding: 0 26px 0 20px; text-align: left; }
.store-btn svg { width: 26px; height: 26px; flex: none; }
.store-btn small { display: block; font-size: 0.72rem; font-weight: 600; opacity: 0.85; line-height: 1.1; }
.store-btn strong { display: block; font-size: 1.12rem; line-height: 1.15; }

/* Hero */
.hero { padding: clamp(56px, 9vw, 112px) 0 clamp(64px, 9vw, 120px); overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: clamp(32px, 6vw, 72px); align-items: center; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 0.82rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--gold);
  background: rgba(255, 205, 72, 0.1); border: 1px solid rgba(255, 205, 72, 0.25); padding: 6px 12px; border-radius: 999px;
}
h1, h2, h3 { line-height: 1.08; letter-spacing: -0.025em; margin: 0; }
.hero h1 { font-size: clamp(2.6rem, 6.2vw, 4.6rem); margin-top: 20px; font-weight: 800; }
.accent { color: var(--gold); }
.lead { font-size: clamp(1.08rem, 1.6vw, 1.25rem); color: var(--ink-soft); max-width: 36ch; margin: 22px 0 32px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; }
.hero-note { color: var(--ink-faint); font-size: 0.9rem; margin-top: 18px; }
@media (max-width: 480px) { .eyebrow { font-size: 0.7rem; letter-spacing: 0.08em; } }
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; text-align: center; }
  .lead { margin-inline: auto; }
  .hero-actions { justify-content: center; }
}

/* Phone mockup */
.phone {
  position: relative; width: min(340px, 78vw); margin-inline: auto; aspect-ratio: 720 / 1564;
  padding: 11px; border-radius: 54px;
  background: linear-gradient(160deg, #2a3045, #12151f);
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.14) inset, 0 40px 80px rgba(0, 0, 0, 0.55), 0 0 120px rgba(255, 196, 64, 0.12);
}
.phone picture, .phone img { width: 100%; height: 100%; border-radius: 44px; overflow: hidden; }
.phone img { object-fit: cover; }
.hero .phone { transform: rotate(-2deg); }
.glow { position: absolute; inset: 10% -10%; z-index: -1; background: radial-gradient(closest-side, rgba(255, 205, 72, 0.25), transparent); filter: blur(30px); }

/* Sections */
section { padding: clamp(72px, 10vw, 128px) 0; }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 56px; }
.section-head h2 { font-size: clamp(2rem, 4.2vw, 3.2rem); font-weight: 800; }
.section-head p { color: var(--ink-soft); font-size: 1.12rem; margin: 16px 0 0; }
.kicker { font-size: 0.82rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--gold); margin: 0 0 14px; }

.feature { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(32px, 7vw, 96px); align-items: center; }
.feature + .feature { margin-top: clamp(80px, 11vw, 140px); }
.feature:nth-child(even) .feature-copy { order: 2; }
.feature h3 { font-size: clamp(1.9rem, 3.6vw, 2.8rem); font-weight: 800; }
.feature .subtitle { font-size: clamp(1.15rem, 1.8vw, 1.35rem); color: var(--gold); font-weight: 600; margin: 14px 0 0; line-height: 1.35; }
.feature .body { color: var(--ink-soft); font-size: 1.06rem; margin: 18px 0 0; max-width: 46ch; }
.points { list-style: none; padding: 0; margin: 24px 0 0; display: grid; gap: 12px; }
.points li { display: flex; gap: 12px; align-items: flex-start; color: var(--ink); }
.points li::before {
  content: ""; flex: none; width: 22px; height: 22px; margin-top: 2px; border-radius: 50%;
  background: rgba(255, 205, 72, 0.14) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23ffcd48' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 12.5l4.5 4.5L19 7.5'/%3E%3C/svg%3E") center / 14px no-repeat;
}
@media (max-width: 900px) {
  .feature { grid-template-columns: 1fr; text-align: center; }
  .feature:nth-child(even) .feature-copy { order: 0; }
  .feature .body { margin-inline: auto; }
  .points { justify-items: center; }
}

/* Steps */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; counter-reset: step; }
.step { background: var(--glass); border: 1px solid var(--hairline); border-radius: var(--radius-lg); padding: 30px 26px; }
.step::before {
  counter-increment: step; content: counter(step);
  display: grid; place-items: center; width: 44px; height: 44px; border-radius: 14px; margin-bottom: 18px;
  font-weight: 800; color: #1a1405; background: linear-gradient(180deg, #ffd766, var(--gold-deep));
}
.step h3 { font-size: 1.3rem; }
.step p { color: var(--ink-soft); margin: 10px 0 0; }
@media (max-width: 820px) { .steps { grid-template-columns: 1fr; } }

/* FAQ */
.faq { max-width: 820px; margin-inline: auto; display: grid; gap: 12px; }
.faq details { background: var(--glass); border: 1px solid var(--hairline); border-radius: var(--radius-md); padding: 4px 22px; }
.faq details[open] { background: var(--glass-strong); }
.faq summary { cursor: pointer; list-style: none; font-weight: 700; font-size: 1.08rem; padding: 18px 32px 18px 0; position: relative; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 0; top: 50%; transform: translateY(-50%); font-size: 1.5rem; color: var(--gold); transition: transform 0.2s ease; }
.faq details[open] summary::after { transform: translateY(-50%) rotate(45deg); }
.faq details p { color: var(--ink-soft); margin: 0 0 20px; }

/* Closing CTA */
.cta { text-align: center; }
.cta-card {
  position: relative; overflow: hidden; border-radius: 36px; padding: clamp(48px, 8vw, 88px) 24px;
  background: radial-gradient(800px 400px at 50% 0%, rgba(255, 205, 72, 0.16), transparent 70%), linear-gradient(180deg, var(--navy-800), var(--navy-900));
  border: 1px solid var(--hairline);
}
.cta-card .app-icon { width: 104px; height: 104px; border-radius: 24px; margin: 0 auto 26px; box-shadow: 0 18px 40px rgba(0, 0, 0, 0.45); }
.cta-card h2 { font-size: clamp(2rem, 4.6vw, 3.4rem); font-weight: 800; max-width: 18ch; margin: 0 auto 30px; }
.cta-astronaut { position: absolute; width: clamp(140px, 18vw, 230px); right: clamp(-20px, 2vw, 40px); bottom: -10px; opacity: 0.9; transform: rotate(8deg); pointer-events: none; }
@media (max-width: 720px) { .cta-astronaut { display: none; } }

/* Footer */
.site-footer { border-top: 1px solid var(--hairline); padding: 48px 0 40px; color: var(--ink-faint); font-size: 0.92rem; background: var(--navy-950); }
.footer-grid { display: grid; grid-template-columns: 1.2fr 2fr; gap: 32px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 10px 22px; list-style: none; padding: 0; margin: 0; justify-content: flex-end; }
.footer-links a { color: var(--ink-soft); text-decoration: none; }
.footer-links a:hover { color: var(--ink); }
.footer-note { margin-top: 28px; font-size: 0.82rem; color: var(--ink-faint); }
@media (max-width: 720px) { .footer-grid { grid-template-columns: 1fr; } .footer-links { justify-content: flex-start; } }

/* Legal / support pages */
.doc { padding: clamp(48px, 7vw, 88px) 0 96px; }
.doc-layout { display: grid; grid-template-columns: 240px minmax(0, 1fr); gap: 56px; align-items: start; }
.doc h1 { font-size: clamp(2.2rem, 5vw, 3.2rem); font-weight: 800; }
.doc-meta { color: var(--ink-faint); margin: 12px 0 36px; font-size: 0.95rem; }
.doc-title { margin-bottom: 4px; }
.doc-toc { position: sticky; top: 96px; background: var(--glass); border: 1px solid var(--hairline); border-radius: var(--radius-md); padding: 20px; }
.doc-toc h2 { font-size: 0.8rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-faint); margin-bottom: 10px; }
.doc-toc ol { margin: 0; padding-left: 18px; display: grid; gap: 8px; font-size: 0.92rem; }
.doc-toc a { color: var(--ink-soft); text-decoration: none; }
.doc-toc a:hover { color: var(--gold); }
.doc-body { max-width: 72ch; }
.doc-body section { padding: 0; margin-bottom: 36px; }
.doc-body h2 { font-size: 1.4rem; margin-bottom: 12px; letter-spacing: -0.015em; }
.doc-body p, .doc-body li { color: #d6dce9; font-size: 1.04rem; }
.doc-body ul { padding-left: 22px; }
.doc-nav { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 48px; }
.support-card { background: var(--glass); border: 1px solid var(--hairline); border-radius: var(--radius-lg); padding: 28px; margin-bottom: 36px; }
.support-card h2 { margin-bottom: 8px; }
@media (max-width: 900px) { .doc-layout { grid-template-columns: 1fr; gap: 28px; } .doc-toc { position: static; } }

/* Reveal on scroll (progressive enhancement) */
.js .reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.7s ease, transform 0.7s ease; }
.js .reveal.is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js .reveal { opacity: 1; transform: none; transition: none; }
  .hero .phone { transform: none; }
  .btn { transition: none; }
}

.visually-hidden { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* Informational label until the app has a public download URL. */
.coming-soon { cursor: default; }
.coming-soon:hover { transform: none; }