/* Cerno — cerno.yunseok.com
   다크 우선 · 앱 디자인 토큰(Theme.swift / cerno.pen)과 1:1
   서드파티 요청 0 (폰트·CSS·스크립트·추적 전부 없음) */

:root {
  color-scheme: dark;

  --bg: #000000;
  --bg-2: #1c1c1e;
  --bg-3: #2c2c2e;
  --bg-4: #3a3a3c;
  --line: rgba(84, 84, 88, 0.5);

  --text: #ffffff;
  --text-2: rgba(235, 235, 245, 0.6);
  --text-3: rgba(235, 235, 245, 0.3);

  --brand: #0a84ff;
  --keep: #30d158;     /* 보관 */
  --pending: #ff9f0a;  /* 삭제 예정 */
  --danger: #ff453a;   /* 휴지통 확정 */
  --favorite: #ff375f; /* 즐겨찾기 */
  --bookmark: #bf5af2; /* 나중에 */

  --radius: 20px;
  --radius-sm: 14px;
  --maxw: 1080px;
  --pad: clamp(20px, 5vw, 40px);

  --font: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Pretendard",
    "Noto Sans KR", "Segoe UI", system-ui, sans-serif;
}

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

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }

:focus-visible { outline: 2px solid var(--brand); outline-offset: 3px; border-radius: 4px; }

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  background: var(--brand); color: #fff; padding: 10px 16px; border-radius: 0 0 12px 0;
}
.skip-link:focus { left: 0; }

.wrap { max-width: var(--maxw); margin-inline: auto; padding-inline: var(--pad); }

/* ---------- Nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(0, 0, 0, 0.72);
  backdrop-filter: saturate(160%) blur(18px);
  -webkit-backdrop-filter: saturate(160%) blur(18px);
  border-bottom: 1px solid var(--line);
}
.nav__inner { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 20px; letter-spacing: -0.5px; color: var(--text); }
.brand img { width: 28px; height: 28px; border-radius: 8px; }
.nav__links { display: flex; align-items: center; gap: 26px; }
.nav__links a { color: var(--text-2); font-size: 15px; font-weight: 500; }
.nav__links a:hover { color: var(--text); text-decoration: none; }
@media (max-width: 720px) { .nav__links a:not(.btn) { display: none; } }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 22px; border-radius: 14px; font-weight: 700; font-size: 15px;
  background: var(--brand); color: #fff; border: 1px solid transparent;
  transition: transform 0.12s ease, opacity 0.12s ease; cursor: pointer;
}
.btn:hover { text-decoration: none; opacity: 0.92; }
.btn:active { transform: scale(0.97); }
.btn--ghost { background: transparent; color: var(--text); border-color: var(--line); }
.btn--lg { padding: 15px 28px; font-size: 16px; border-radius: 16px; }

/* ---------- Hero ---------- */
.hero { position: relative; padding-top: clamp(56px, 9vw, 100px); padding-bottom: clamp(40px, 6vw, 72px); overflow: hidden; }
.hero::before {
  content: ""; position: absolute; inset: -20% 0 auto -10%;
  width: 70%; height: 520px; pointer-events: none; z-index: -1;
  background: radial-gradient(50% 50% at 30% 30%, rgba(10, 132, 255, 0.28), transparent 70%);
  filter: blur(8px);
}
.hero__grid { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: clamp(24px, 5vw, 56px); align-items: center; }
@media (max-width: 880px) { .hero__grid { grid-template-columns: 1fr; text-align: center; } }

.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 700; color: var(--brand);
  background: rgba(10, 132, 255, 0.12); border: 1px solid rgba(10, 132, 255, 0.28);
  padding: 6px 13px; border-radius: 999px; margin-bottom: 22px;
}
.dot { width: 7px; height: 7px; border-radius: 50%; background: var(--keep); box-shadow: 0 0 8px var(--keep); }

h1.hero__title { font-size: clamp(34px, 6vw, 60px); line-height: 1.12; font-weight: 800; letter-spacing: -1.5px; }
h1.hero__title .accent { color: var(--brand); }
.hero__sub { margin-top: 20px; font-size: clamp(16px, 2.3vw, 19px); color: var(--text-2); max-width: 30ch; }
@media (max-width: 880px) { .hero__sub { margin-inline: auto; } }
.hero__cta { margin-top: 32px; display: flex; gap: 12px; flex-wrap: wrap; }
@media (max-width: 880px) { .hero__cta { justify-content: center; } }
.hero__note { margin-top: 14px; font-size: 13px; color: var(--text-3); }

/* ---------- Phone mockup ---------- */
.phone {
  position: relative; width: min(300px, 78vw); margin-inline: auto;
  border-radius: 46px; padding: 10px;
  background: linear-gradient(160deg, #2c2c2e, #1c1c1e);
  border: 1px solid var(--bg-4);
  box-shadow: 0 40px 90px -30px rgba(0, 0, 0, 0.9), 0 0 0 1px rgba(255, 255, 255, 0.04) inset;
}
.phone img { border-radius: 38px; width: 100%; }
.phone--tilt { transform: rotate(2deg); }
@media (prefers-reduced-motion: reduce) { .phone--tilt { transform: none; } }

/* ---------- Trust strip ---------- */
.trust { border-block: 1px solid var(--line); background: linear-gradient(180deg, rgba(28,28,30,0.5), transparent); }
.trust__row { display: flex; flex-wrap: wrap; gap: 12px 26px; justify-content: center; padding: 22px 0; }
.trust__item { display: inline-flex; align-items: center; gap: 9px; font-weight: 600; font-size: 15px; color: var(--text); }
.trust__item svg { width: 19px; height: 19px; flex: none; }

/* ---------- Sections ---------- */
section { padding-block: clamp(56px, 9vw, 104px); }
.section-head { max-width: 40ch; margin-bottom: clamp(32px, 5vw, 56px); }
.section-head.center { margin-inline: auto; text-align: center; }
.kicker { font-size: 14px; font-weight: 700; letter-spacing: 0.4px; text-transform: uppercase; color: var(--brand); }
h2 { font-size: clamp(26px, 4vw, 40px); line-height: 1.18; font-weight: 800; letter-spacing: -1px; margin-top: 12px; }
.section-head p { margin-top: 16px; font-size: 17px; color: var(--text-2); }

/* ---------- Feature cards ---------- */
.features { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
@media (max-width: 720px) { .features { grid-template-columns: 1fr; } }
.card {
  background: linear-gradient(180deg, var(--bg-2), #161618);
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: clamp(22px, 3vw, 30px); position: relative; overflow: hidden;
}
.card h3 { font-size: 20px; font-weight: 700; letter-spacing: -0.4px; }
.card p { margin-top: 10px; color: var(--text-2); font-size: 15.5px; }
.card__icon {
  width: 46px; height: 46px; border-radius: 13px; display: grid; place-items: center;
  margin-bottom: 18px; background: rgba(10, 132, 255, 0.14);
}
.card__icon svg { width: 24px; height: 24px; }

/* swipe legend chips */
.legend { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.chip { display: inline-flex; align-items: center; gap: 8px; font-size: 13.5px; font-weight: 600; color: var(--text); background: var(--bg-3); border: 1px solid var(--line); padding: 7px 12px; border-radius: 999px; }
.chip i { width: 9px; height: 9px; border-radius: 50%; display: inline-block; }

/* ---------- Split (text + shot) ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(28px, 6vw, 72px); align-items: center; }
.split.reverse .split__media { order: -1; }
@media (max-width: 820px) { .split, .split.reverse { grid-template-columns: 1fr; } .split.reverse .split__media { order: 0; } .split__media { margin-top: 8px; } }
.checklist { list-style: none; margin-top: 22px; display: grid; gap: 14px; }
.checklist li { display: flex; gap: 12px; align-items: flex-start; font-size: 16px; color: var(--text); }
.checklist li b { font-weight: 700; }
.checklist svg { width: 22px; height: 22px; flex: none; color: var(--keep); margin-top: 1px; }

/* ---------- Highlight band ---------- */
.band { background: linear-gradient(180deg, rgba(10,132,255,0.07), transparent); border-block: 1px solid var(--line); }

/* ---------- Pricing ---------- */
.price { max-width: 560px; margin-inline: auto; }
.price__card { background: linear-gradient(180deg, var(--bg-2), #161618); border: 1px solid var(--line); border-radius: var(--radius); padding: clamp(26px, 4vw, 40px); text-align: center; }
.price__tag { font-size: 15px; color: var(--keep); font-weight: 700; }
.price__big { font-size: clamp(30px, 5vw, 44px); font-weight: 800; letter-spacing: -1px; margin-top: 8px; }
.price__list { list-style: none; margin: 22px 0 0; display: grid; gap: 12px; text-align: left; }
.price__list li { display: flex; gap: 10px; color: var(--text-2); }
.price__list svg { width: 20px; height: 20px; color: var(--keep); flex: none; }
.price__foot { margin-top: 20px; font-size: 13px; color: var(--text-3); }

/* ---------- FAQ ---------- */
.faq { max-width: 760px; margin-inline: auto; display: grid; gap: 12px; }
.faq details { background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--radius-sm); overflow: hidden; }
.faq summary { cursor: pointer; padding: 18px 20px; font-weight: 600; font-size: 17px; list-style: none; display: flex; justify-content: space-between; align-items: center; gap: 16px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--text-3); font-size: 22px; font-weight: 400; transition: transform 0.18s ease; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq .faq__body { padding: 0 20px 20px; color: var(--text-2); font-size: 15.5px; }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--line); padding-block: 44px; }
.footer__grid { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 24px; align-items: flex-start; }
.footer__links { display: flex; flex-wrap: wrap; gap: 18px; }
.footer__links a { color: var(--text-2); font-size: 14.5px; }
.footer__meta { color: var(--text-3); font-size: 13.5px; margin-top: 14px; max-width: 46ch; }
.footer__note { margin-top: 8px; color: var(--text-3); font-size: 13px; }

/* ---------- Legal pages ---------- */
.legal { max-width: 760px; padding-block: clamp(40px, 6vw, 72px); }
.legal__meta { color: var(--text-3); font-size: 14px; margin-top: 10px; }
.legal h1 { font-size: clamp(28px, 5vw, 38px); font-weight: 800; letter-spacing: -0.8px; }
.legal h2 { font-size: 20px; margin-top: 38px; letter-spacing: -0.3px; }
.legal h2:first-of-type { margin-top: 28px; }
.legal p, .legal li { color: var(--text-2); font-size: 16px; margin-top: 12px; }
.legal ul { margin-top: 12px; padding-left: 22px; }
.legal li { margin-top: 8px; }
.legal strong { color: var(--text); }
.legal .toc { background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 18px 22px; margin-top: 28px; }
.legal .toc ol { margin: 8px 0 0; padding-left: 20px; }
.legal .toc a { font-size: 15px; }
.legal hr { border: none; border-top: 1px solid var(--line); margin-top: 40px; }
.legal__table { width: 100%; border-collapse: collapse; margin-top: 16px; border: 1px solid var(--line); border-radius: var(--radius-sm); overflow: hidden; }
.legal__table th, .legal__table td { text-align: left; vertical-align: top; padding: 12px 14px; font-size: 15px; border-top: 1px solid var(--line); }
.legal__table tr:first-child th, .legal__table tr:first-child td { border-top: none; }
.legal__table th { width: 34%; color: var(--text); font-weight: 600; background: var(--bg-2); white-space: nowrap; }
.legal__table td { color: var(--text-2); }
@media (max-width: 520px) { .legal__table th { white-space: normal; width: 40%; } }
.backlink { display: inline-flex; align-items: center; gap: 6px; color: var(--text-2); font-size: 14px; margin-bottom: 8px; }