/* DualCam site — colours lifted from the app's Theme.swift.
   recording  #FF3B30  (1.0, 0.231, 0.188)
   warning    #FF9F0A  (1.0, 0.624, 0.039)
   danger     #FF453A  (1.0, 0.271, 0.227)
   accent     #FFD60A  (1.0, 0.839, 0.039)
   surface    white @ 14%   text secondary white @ 60%   tertiary white @ 30%
   Spacing/radii follow Metrics: 4/8/12/16/24/32, radiusCard 12, radiusStage 16. */

:root {
  --record: #FF3B30;
  --warning: #FF9F0A;
  --danger: #FF453A;
  --accent: #FFD60A;

  --bg: #0B0B0D;
  --bg-alt: #131316;
  --text: #FFFFFF;
  --text-2: rgba(255, 255, 255, 0.6);
  --text-3: rgba(255, 255, 255, 0.3);
  --surface: rgba(255, 255, 255, 0.07);
  --surface-2: rgba(255, 255, 255, 0.14);
  --line: rgba(255, 255, 255, 0.12);

  --r-card: 12px;
  --r-stage: 16px;
  --s4: 4px; --s8: 8px; --s12: 12px; --s16: 16px; --s24: 24px; --s32: 32px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #FFFFFF;
    --bg-alt: #F5F5F7;
    --text: #101013;
    --text-2: rgba(16, 16, 19, 0.66);
    --text-3: rgba(16, 16, 19, 0.4);
    --surface: rgba(16, 16, 19, 0.04);
    --surface-2: rgba(16, 16, 19, 0.09);
    --line: rgba(16, 16, 19, 0.12);
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 400 17px/1.6 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue",
        "PingFang SC", "Hiragino Sans", "Noto Sans CJK", "Malgun Gothic", Arial, sans-serif;
  text-rendering: optimizeLegibility;
}

a { color: inherit; }

.wrap { width: 100%; max-width: 1080px; margin: 0 auto; padding: 0 var(--s24); }
.wrap.narrow { max-width: 760px; }
.center { text-align: center; }

.skip {
  position: absolute; left: -9999px; top: 0;
  background: var(--accent); color: #000; padding: var(--s12) var(--s16); z-index: 10;
}
.skip:focus { left: 0; }

/* ---------------------------------------------------------------- header --- */

.site-head {
  position: sticky; top: 0; z-index: 5;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(150%) blur(14px);
  border-bottom: 1px solid var(--line);
}
.head-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--s16); min-height: 56px; flex-wrap: wrap;
}
.brand {
  display: inline-flex; align-items: center; gap: var(--s8);
  font-weight: 700; font-size: 17px; text-decoration: none; letter-spacing: -0.01em;
}
.brand .dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--record); box-shadow: 0 0 0 4px color-mix(in srgb, var(--record) 22%, transparent);
}
.topnav { display: flex; gap: var(--s16); flex-wrap: wrap; }
.topnav a {
  color: var(--text-2); text-decoration: none; font-size: 14px; font-weight: 600;
  padding: var(--s8) 0;
}
.topnav a:hover { color: var(--text); }

/* ------------------------------------------------------------------ hero --- */

.hero { padding: clamp(48px, 9vw, 104px) 0 var(--s32); }
.kicker {
  margin: 0 0 var(--s16);
  font-size: 13px; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--accent);
}
h1 {
  margin: 0 0 var(--s24);
  font-size: clamp(32px, 5.4vw, 56px); line-height: 1.12; font-weight: 700;
  letter-spacing: -0.02em; max-width: 18ch;
}
.lede { margin: 0 0 var(--s32); font-size: clamp(17px, 2.1vw, 21px); color: var(--text-2); max-width: 62ch; }

.cta-row { margin: 0 0 var(--s12); }
.btn {
  display: inline-block; text-decoration: none;
  background: var(--text); color: var(--bg);
  font-weight: 700; font-size: 17px;
  padding: 15px var(--s32); border-radius: 999px;
  border: 1px solid transparent;
}
.btn:hover { opacity: 0.85; }
.cta-sub { margin: 0 0 var(--s24); font-size: 14px; color: var(--text-3); }

.req-badge {
  display: inline-block; margin: 0;
  background: color-mix(in srgb, var(--warning) 14%, transparent);
  border: 1px solid color-mix(in srgb, var(--warning) 45%, transparent);
  color: var(--text); font-size: 14px; line-height: 1.5;
  padding: var(--s12) var(--s16); border-radius: var(--r-card);
  max-width: 62ch;
}

/* --------------------------------------------------------------- sections --- */

.band { padding: clamp(44px, 7vw, 88px) 0; }
.band.alt { background: var(--bg-alt); }
.band.closing { border-top: 1px solid var(--line); }
.band.closing h1, .band.closing h2 { max-width: none; }

h2 {
  margin: 0 0 var(--s16);
  font-size: clamp(24px, 3.4vw, 36px); line-height: 1.2; font-weight: 700;
  letter-spacing: -0.015em; max-width: 24ch;
}
.center h2 { max-width: none; margin-inline: auto; }
.section-lede { margin: 0 0 var(--s32); color: var(--text-2); max-width: 68ch; font-size: 17px; }
.note { margin: var(--s24) 0 0; color: var(--text-3); font-size: 14px; max-width: 72ch; }

.grid { display: grid; gap: var(--s16); }
.grid.two { grid-template-columns: repeat(auto-fit, minmax(360px, 1fr)); }
.grid.three { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-stage);
  padding: var(--s24);
}
.card h3 { margin: 0 0 var(--s8); font-size: 17px; font-weight: 600; line-height: 1.35; }
.card p { margin: 0; color: var(--text-2); font-size: 15px; }
.card.compact { padding: var(--s16) var(--s24); }

/* CSS-only sketches of the three layouts (no image assets, no CDN). */
.mock { margin-bottom: var(--s16); }
.mock-frame {
  position: relative;
  width: 84px; aspect-ratio: 9 / 16;
  border-radius: 10px; border: 1px solid var(--line);
  background: linear-gradient(160deg,
              color-mix(in srgb, var(--accent) 22%, transparent),
              color-mix(in srgb, var(--record) 18%, transparent));
  overflow: hidden;
  display: flex;
}
.mock-pip {
  position: absolute; right: 6px; bottom: 6px;
  width: 30px; aspect-ratio: 9 / 16; border-radius: 5px;
  background: var(--surface-2); border: 1px solid var(--line);
  backdrop-filter: blur(2px);
}
.mock-frame.split-v { flex-direction: column; }
.mock-frame.split-h { flex-direction: row; }
.mock-frame.split-v > span, .mock-frame.split-h > span { flex: 1; }
.mock-frame.split-v > span + span,
.mock-frame.split-h > span + span { background: var(--surface-2); }

.ticks { margin: 0; padding: 0; list-style: none; }
.ticks li {
  position: relative; padding-left: 28px; margin-bottom: var(--s12);
  color: var(--text-2); font-size: 16px;
}
.ticks li::before {
  content: ""; position: absolute; left: 6px; top: 10px;
  width: 8px; height: 8px; border-radius: 50%; background: var(--accent);
}
.ticks.warn li::before { background: var(--warning); }

/* ------------------------------------------------------------------- faq --- */

.faq details {
  border-bottom: 1px solid var(--line);
  padding: var(--s16) 0;
}
.faq summary {
  cursor: pointer; font-weight: 600; font-size: 17px; line-height: 1.4;
  list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; float: right; color: var(--text-3); margin-left: var(--s16); }
.faq details[open] summary::after { content: "–"; }
.faq details p { margin: var(--s12) 0 0; color: var(--text-2); font-size: 16px; }

/* ---------------------------------------------------------------- footer --- */

.site-foot { border-top: 1px solid var(--line); padding: var(--s32) 0 var(--s32); }
.langs { display: flex; flex-wrap: wrap; gap: var(--s8) var(--s16); margin-bottom: var(--s24); }
.lang { font-size: 14px; color: var(--text-2); text-decoration: none; }
.lang:hover { color: var(--text); }
.lang.current { color: var(--text); font-weight: 600; }
.foot-links { display: flex; flex-wrap: wrap; gap: var(--s8) var(--s16); margin-bottom: var(--s16); }
.foot-links a { font-size: 14px; color: var(--text-2); text-decoration: none; }
.foot-links a:hover { color: var(--text); }
.fine { margin: 0; font-size: 13px; color: var(--text-3); line-height: 1.5; }

@media (max-width: 640px) {
  .wrap { padding: 0 var(--s16); }
  .topnav { gap: var(--s12); }
  .topnav a { font-size: 13px; }
  .btn { display: block; text-align: center; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}