/* SurfEnglish — oceanic liquid-glass design system (matches the iOS app). */

:root {
  --accent: #4FD2FF;
  --accent2: #B388FF;
  --accent-ink: #06131F;
  --lens: #FF9E64;
  --ink: #EAF1FF;
  --ink-soft: rgba(234, 241, 255, .66);
  --ink-faint: rgba(234, 241, 255, .4);
  --hairline: rgba(255, 255, 255, .10);
  --hairline-strong: rgba(255, 255, 255, .16);
  --glass: rgba(255, 255, 255, .06);
  --glass-2: rgba(255, 255, 255, .10);
  --radius: 26px;
  --radius-sm: 16px;
  --grad: linear-gradient(135deg, var(--accent), var(--accent2));
  --a1: #5BE7A9; --a2: #7FD8FF; --b1: #FFC56B; --b2: #FF9F68; --c1: #FF7A9C;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI",
          Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
}

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

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  font-family: var(--font);
  color: var(--ink);
  background: #04060D;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* Deep-sea backdrop: radial gradient + drifting glow blobs (pure gradients, cheap). */
.bg {
  position: fixed; inset: 0; z-index: -1;
  background:
    radial-gradient(1200px 800px at 15% -5%, rgba(43, 212, 255, .16), transparent 60%),
    radial-gradient(1000px 700px at 90% 15%, rgba(122, 92, 255, .14), transparent 60%),
    radial-gradient(900px 700px at 20% 75%, rgba(25, 240, 200, .09), transparent 60%),
    radial-gradient(800px 600px at 85% 95%, rgba(255, 138, 92, .08), transparent 60%),
    radial-gradient(140% 100% at 50% 0%, #122448 0%, #070B18 55%, #04060D 100%);
}

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

h1, h2, h3 { line-height: 1.15; letter-spacing: -.02em; font-weight: 700; }
h1 { font-size: clamp(2.4rem, 5.5vw, 4rem); }
h2 { font-size: clamp(1.8rem, 3.6vw, 2.6rem); margin-bottom: .5em; }
h3 { font-size: 1.25rem; margin-bottom: .4em; }
p  { color: var(--ink-soft); }

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

img { max-width: 100%; height: auto; display: block; }

.eyebrow {
  text-transform: uppercase; letter-spacing: .14em; font-size: .78rem;
  font-weight: 700; color: var(--accent); margin-bottom: 12px;
}
.grad-text {
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}

.glass {
  background: var(--glass);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  backdrop-filter: blur(22px) saturate(180%);
  -webkit-backdrop-filter: blur(22px) saturate(180%);
}

/* ———— header ———— */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(7, 11, 24, .6);
  border-bottom: 1px solid var(--hairline);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
}
.header-inner {
  display: flex; align-items: center; gap: 20px;
  height: 60px;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  font-weight: 700; font-size: 1.05rem; color: var(--ink);
}
.brand:hover { text-decoration: none; }
.brand img { border-radius: 8px; }
.main-nav { display: flex; gap: 22px; margin-inline-start: auto; }
.main-nav a { color: var(--ink-soft); font-size: .92rem; font-weight: 500; }
.main-nav a:hover { color: var(--ink); text-decoration: none; }
.header-actions { display: flex; align-items: center; gap: 12px; }
.main-nav + .header-actions { margin-inline-start: 0; }

.lang-switch { position: relative; }
.lang-switch summary {
  list-style: none; cursor: pointer; white-space: nowrap;
  color: var(--ink-soft); font-size: .88rem;
  padding: 6px 12px; border: 1px solid var(--hairline); border-radius: 999px;
}
.lang-switch summary::-webkit-details-marker { display: none; }
.lang-switch summary::after { content: " ▾"; font-size: .7em; }
.lang-menu {
  position: absolute; inset-inline-end: 0; top: calc(100% + 8px);
  display: grid; grid-template-columns: 1fr 1fr; gap: 2px;
  min-width: 320px; padding: 10px;
  background: rgba(13, 20, 40, .95);
  border: 1px solid var(--hairline-strong); border-radius: var(--radius-sm);
  backdrop-filter: blur(30px);
  -webkit-backdrop-filter: blur(30px);
}
.lang-menu a {
  padding: 8px 12px; border-radius: 10px; color: var(--ink-soft); font-size: .9rem;
}
.lang-menu a:hover { background: var(--glass-2); color: var(--ink); text-decoration: none; }
.lang-menu a[aria-current="true"] { color: var(--accent); font-weight: 600; }

.btn {
  display: inline-block; font-weight: 600; color: var(--accent-ink);
  background: var(--grad); border-radius: 999px; padding: 10px 22px;
}
.btn:hover { text-decoration: none; filter: brightness(1.08); }
.btn-small { padding: 7px 16px; font-size: .88rem; }

/* ———— App Store badge ———— */
.asbadge {
  display: inline-flex; align-items: center; gap: 10px;
  background: #000; color: #fff;
  border: 1px solid rgba(255, 255, 255, .28); border-radius: 12px;
  padding: 8px 18px;
}
.asbadge-apple { width: 26px; height: 26px; }
.asbadge-text { display: flex; flex-direction: column; line-height: 1.15; text-align: start; }
.asbadge-text small { font-size: .66rem; font-weight: 400; }
.asbadge-text strong { font-size: 1.25rem; font-weight: 600; letter-spacing: -.01em; }
.asbadge-link:hover { text-decoration: none; }
.asbadge-link:hover .asbadge { border-color: rgba(255, 255, 255, .5); }

/* ———— hero ———— */
.hero {
  display: grid; grid-template-columns: 1.15fr .85fr;
  align-items: center; gap: 48px;
  padding-top: 88px; padding-bottom: 40px;
  min-height: 78vh;
}
.hero-copy .lede {
  font-size: 1.15rem; margin: 20px 0 32px; max-width: 34em;
}
.cta-row { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.cta-note { font-size: .85rem; color: var(--ink-faint); margin-top: 14px; }

/* ———— phone frames ———— */
.phone {
  width: min(320px, 78vw);
  margin: 0 auto;
  padding: 11px;
  border-radius: 54px;
  background: linear-gradient(160deg, rgba(255,255,255,.16), rgba(255,255,255,.04));
  border: 1px solid var(--hairline-strong);
  box-shadow:
    0 30px 80px -20px rgba(4, 6, 13, .9),
    0 0 120px -30px rgba(79, 210, 255, .25);
}
.phone img { border-radius: 43px; width: 100%; }
.phone-hero {
  transform: rotate(2.5deg);
}
.phone-raised { transform: translateY(-24px); }

/* ———— sections ———— */
.section { padding: 96px 24px; }
.section-narrow { max-width: 820px; }
.section-lede { max-width: 40em; margin-bottom: 40px; font-size: 1.05rem; }

.loop-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
}
.loop-card { padding: 28px; }
.loop-num {
  display: inline-grid; place-items: center;
  width: 34px; height: 34px; border-radius: 50%;
  background: var(--grad); color: var(--accent-ink);
  font-weight: 700; margin-bottom: 14px;
}

.feature-row {
  display: grid; grid-template-columns: 1fr 1fr;
  align-items: center; gap: 48px;
  padding: 56px 0;
}
.feature-row:nth-of-type(even) .feature-copy { order: 2; }
.feature-copy h3 { font-size: clamp(1.35rem, 2.4vw, 1.7rem); }
.feature-copy p { max-width: 30em; }

.cefr-chips { display: flex; gap: 8px; margin-top: 18px; }
.chip {
  display: inline-block; padding: 5px 13px; border-radius: 999px;
  font-size: .82rem; font-weight: 600;
  background: var(--glass-2); border: 1px solid var(--hairline);
  color: var(--ink-soft);
}
.chip-a1 { color: var(--a1); border-color: color-mix(in srgb, var(--a1) 40%, transparent); }
.chip-a2 { color: var(--a2); border-color: color-mix(in srgb, var(--a2) 40%, transparent); }
.chip-b1 { color: var(--b1); border-color: color-mix(in srgb, var(--b1) 40%, transparent); }
.chip-b2 { color: var(--b2); border-color: color-mix(in srgb, var(--b2) 40%, transparent); }
.chip-c1 { color: var(--c1); border-color: color-mix(in srgb, var(--c1) 40%, transparent); }
.chip-accent { color: var(--accent-ink); background: var(--grad); border: none; }
.chip-dim { color: var(--ink-faint); }

.voice-panel { padding: 40px; margin-top: 32px; }
.voice-chips { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 18px; }

/* games */
.games-phones {
  display: flex; justify-content: center; gap: 28px;
  margin: 48px 0; flex-wrap: wrap;
}
.games-phones .phone { width: min(270px, 72vw); }
.games-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px;
}
.game-card { padding: 26px; }
.game-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.badge {
  font-size: .74rem; font-weight: 700; white-space: nowrap;
  color: var(--accent); background: rgba(79, 210, 255, .12);
  padding: 4px 12px; border-radius: 999px;
}
.game-soon { opacity: .55; }
.game-soon .badge { color: var(--ink-faint); background: var(--glass-2); }

/* browser */
.check-list { list-style: none; margin-top: 20px; }
.check-list li {
  position: relative; padding-inline-start: 30px; margin-bottom: 12px;
  color: var(--ink-soft);
}
.check-list li::before {
  content: "✓"; position: absolute; inset-inline-start: 0;
  color: var(--accent); font-weight: 700;
}
.phone-pair { display: flex; gap: 20px; justify-content: center; }
.phone-pair .phone { width: min(230px, 44vw); }

/* languages */
.langs { padding: 36px; }
.langs h4 { margin: 18px 0 12px; color: var(--ink-faint); font-size: .82rem;
  text-transform: uppercase; letter-spacing: .1em; }
.langs h4:first-child { margin-top: 0; }
.lang-chip-grid { display: flex; flex-wrap: wrap; gap: 10px; }

/* plus */
.plus-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; max-width: 780px; }
.plus-card { padding: 30px; }
.plus-card ul { list-style: none; margin-top: 14px; }
.plus-card li { padding: 7px 0; color: var(--ink-soft); border-bottom: 1px solid var(--hairline); }
.plus-card li:last-child { border-bottom: none; }
.plus-featured { border-color: color-mix(in srgb, var(--accent) 45%, transparent);
  box-shadow: 0 0 80px -30px rgba(79, 210, 255, .5); }

.privacy-link { margin-top: 28px; font-weight: 600; }

/* faq */
.faq-list details { margin-bottom: 12px; padding: 0; overflow: hidden; }
.faq-list summary {
  cursor: pointer; list-style: none; font-weight: 600;
  padding: 20px 24px; position: relative;
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after {
  content: "+"; position: absolute; inset-inline-end: 22px; top: 16px;
  font-size: 1.4rem; color: var(--accent); font-weight: 400;
}
.faq-list details[open] summary::after { content: "–"; }
.faq-list details p { padding: 0 24px 20px; }

/* final cta */
.final-cta { text-align: center; padding-bottom: 140px; }
.final-cta .section-lede { margin: 12px auto 32px; }

/* ———— footer ———— */
.site-footer {
  border-top: 1px solid var(--hairline);
  background: rgba(4, 6, 13, .6);
  padding: 56px 0 32px;
}
.footer-grid {
  display: grid; grid-template-columns: 1.2fr 1fr 1.6fr; gap: 40px;
  margin-bottom: 40px;
}
.footer-brand p { margin-top: 10px; color: var(--ink-faint); }
.site-footer h4 {
  font-size: .8rem; text-transform: uppercase; letter-spacing: .1em;
  color: var(--ink-faint); margin-bottom: 14px;
}
.site-footer a { display: block; color: var(--ink-soft); padding: 4px 0; font-size: .92rem; }
.site-footer a:hover { color: var(--ink); }
.footer-langs .lang-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 2px 16px;
}
.footer-legal {
  border-top: 1px solid var(--hairline); padding-top: 24px;
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
}
.footer-legal p { font-size: .8rem; color: var(--ink-faint); }

/* ———— legal / support pages ———— */
.page-legal main { padding-top: 40px; }
.legal-content { max-width: 760px; margin: 0 auto; padding: 40px 24px 100px; }
.legal-content h1 { font-size: clamp(2rem, 4vw, 2.8rem); margin-bottom: 8px; }
.legal-updated { color: var(--ink-faint); font-size: .9rem; margin-bottom: 40px; }
.legal-content h2 { font-size: 1.4rem; margin: 44px 0 14px; }
.legal-content h3 { font-size: 1.05rem; margin: 26px 0 8px; }
.legal-content p, .legal-content li { color: var(--ink-soft); margin-bottom: 12px; }
.legal-content ul { padding-inline-start: 22px; }
.legal-content .glass { padding: 24px; margin: 20px 0; }
.legal-content table { border-collapse: collapse; width: 100%; margin: 16px 0; font-size: .92rem; }
.legal-content th, .legal-content td {
  text-align: start; padding: 10px 14px; border: 1px solid var(--hairline);
  color: var(--ink-soft);
}
.legal-content th { color: var(--ink); background: var(--glass); }

/* ———— reveal animation ———— */
.reveal { opacity: 0; transform: translateY(24px);
  transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ———— responsive ———— */
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; text-align: center; padding-top: 56px; min-height: 0; }
  .hero-copy .lede { margin-inline: auto; }
  .cta-row { justify-content: center; }
  .phone-hero { transform: none; margin-top: 20px; }
  .feature-row { grid-template-columns: 1fr; gap: 32px; padding: 40px 0; }
  .feature-row:nth-of-type(even) .feature-copy { order: 0; }
  .loop-grid { grid-template-columns: 1fr; }
  .games-grid { grid-template-columns: 1fr; }
  .plus-grid { grid-template-columns: 1fr; }
  .main-nav { display: none; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .phone-raised { transform: none; }
  .lang-menu { position: fixed; inset-inline: 16px; top: 70px; min-width: 0; }
}