/* ai-sleep-coach — V2 사이클 8b LANDING style.css
   브랜드 컬러: #6366f1
   외부 폰트 0, 외부 CDN 0, 모바일 우선, WCAG 2.1 AA */

:root {
  --bg: #0a0a0a;
  --bg-soft: #111;
  --bg-card: #131313;
  --fg: #f5f5f5;
  --fg-soft: #c2c2c2;
  --fg-muted: #8a8a8a;
  --accent: #6366f1;
  --accent-dim: #3730a3;
  --accent-2: #ff007a;
  --border: #1f1f1f;
  --mono: ui-monospace, SFMono-Regular, "JetBrains Mono", Menlo, Consolas, monospace;
  --sans: ui-sans-serif, system-ui, -apple-system, "Pretendard", "Apple SD Gothic Neo", "Noto Sans KR", sans-serif;
  --max: 1080px;
  --pad: clamp(16px, 4vw, 32px);
}

[data-theme="light"] {
  --bg: #fdfdfd;
  --bg-soft: #f4f4f4;
  --bg-card: #ffffff;
  --fg: #0a0a0a;
  --fg-soft: #2a2a2a;
  --fg-muted: #6a6a6a;
  --accent: #3730a3;
  --border: #e3e3e3;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--mono);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--fg); text-decoration: none; }
a:hover { color: var(--accent); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

code { font-family: var(--mono); background: var(--bg-soft); padding: 0.1em 0.4em; border-radius: 4px; }

.muted { color: var(--fg-muted); }
.small { font-size: 0.85em; }
.accent { color: var(--accent); }

/* NAV */
.nav {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px var(--pad);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; background: rgba(10,10,10,0.85); backdrop-filter: blur(10px);
  z-index: 10;
}
[data-theme="light"] .nav { background: rgba(253,253,253,0.85); }
.nav .logo { font-weight: 700; font-size: 18px; letter-spacing: -0.02em; }
.nav nav { display: flex; gap: 18px; align-items: center; flex-wrap: wrap; }
.nav nav a { font-size: 14px; color: var(--fg-soft); }
.nav nav a:hover { color: var(--accent); }
.nav .cta-mini { border: 1px solid var(--accent); padding: 6px 12px; border-radius: 4px; color: var(--accent); }
.nav .cta-mini:hover { background: var(--accent); color: var(--bg); }
.ghost-btn {
  background: transparent; color: var(--fg-soft); border: 1px solid var(--border);
  padding: 4px 10px; border-radius: 4px; font-family: var(--mono); font-size: 13px;
  cursor: pointer;
}
.ghost-btn:hover { border-color: var(--accent); color: var(--accent); }

main { max-width: var(--max); margin: 0 auto; padding: 0 var(--pad); }

/* HERO */
.hero { padding: 80px 0 60px; }
.hero-grid { display: grid; grid-template-columns: 1fr; gap: 48px; align-items: center; }
@media (min-width: 900px) { .hero-grid { grid-template-columns: 1fr 1fr; gap: 64px; } }
.kicker { color: var(--accent); font-size: 13px; letter-spacing: 0.04em; margin: 0 0 16px; }
.hero h1 {
  font-size: clamp(36px, 5.5vw, 72px); font-weight: 700;
  line-height: 1.05; letter-spacing: -0.03em; margin: 0 0 24px;
}
.hero .sub { font-size: clamp(16px, 2vw, 20px); color: var(--fg-soft); margin: 0 0 32px; max-width: 52ch; }
.cta-row { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 18px; }
.btn {
  display: inline-block; padding: 12px 24px; border-radius: 6px;
  font-family: var(--mono); font-size: 15px; font-weight: 600;
  transition: all 0.15s ease; border: 1px solid var(--border);
}
.btn.primary { background: var(--accent); color: var(--bg); border-color: var(--accent); }
.btn.primary:hover { background: var(--bg); color: var(--accent); }
.btn.secondary { background: transparent; color: var(--fg); }
.btn.secondary:hover { border-color: var(--accent); color: var(--accent); }
.dot { display: inline-block; width: 7px; height: 7px; border-radius: 50%; background: var(--accent); margin-right: 4px; vertical-align: middle; }

/* TERMINAL */
.terminal {
  background: #050505; border: 1px solid var(--border); border-radius: 8px;
  overflow: hidden; font-family: var(--mono); font-size: 13px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}
.term-bar { background: #1a1a1a; padding: 10px 14px; display: flex; align-items: center; gap: 6px; border-bottom: 1px solid #222; }
.term-bar span { width: 11px; height: 11px; border-radius: 50%; background: #333; }
.term-bar span:nth-child(1) { background: #ff5f57; }
.term-bar span:nth-child(2) { background: #febc2e; }
.term-bar span:nth-child(3) { background: #28c840; }
.term-bar em { font-style: normal; color: #888; margin-left: 12px; font-size: 12px; }
.term-body { margin: 0; padding: 18px 20px; color: #d0d0d0; white-space: pre-wrap; line-height: 1.7; min-height: 240px; }
.term-body .accent { color: var(--accent); font-weight: 700; }

/* STATS */
.stats {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px;
  border-top: 1px solid var(--border); border-bottom: 1px solid var(--border);
  padding: 32px var(--pad); margin: 40px auto;
  max-width: var(--max);
}
@media (min-width: 700px) { .stats { grid-template-columns: repeat(4, 1fr); } }
.stat { text-align: center; }
.stat .num { display: block; font-size: clamp(28px, 4vw, 42px); font-weight: 700; color: var(--accent); }
.stat .label { display: block; color: var(--fg-muted); font-size: 13px; margin-top: 6px; }

/* BLOCK */
.block { padding: 60px 0; border-top: 1px solid var(--border); }
.block h2 { font-size: clamp(28px, 3.6vw, 44px); margin: 0 0 40px; letter-spacing: -0.02em; }
.dark-block { background: linear-gradient(180deg, #050505, #0a0a0a); margin: 60px calc(-1 * var(--pad)) 0; padding-left: var(--pad); padding-right: var(--pad); }

.cols { display: grid; grid-template-columns: 1fr; gap: 32px; }
@media (min-width: 700px) { .cols { grid-template-columns: 1fr 1fr; } }
.col h3 { margin: 0 0 8px; }
.big { font-size: clamp(18px, 2vw, 24px); line-height: 1.4; }

.grid-3 { display: grid; grid-template-columns: 1fr; gap: 20px; }
@media (min-width: 700px) { .grid-3 { grid-template-columns: repeat(3, 1fr); } }
.grid-4 { display: grid; grid-template-columns: 1fr; gap: 20px; }
@media (min-width: 700px) { .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1000px) { .grid-4 { grid-template-columns: repeat(3, 1fr); } }

.card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 8px;
  padding: 24px; transition: border-color 0.15s ease, transform 0.15s ease;
}
.card:hover { border-color: var(--accent); transform: translateY(-2px); }
.card-num { color: var(--accent); font-size: 12px; letter-spacing: 0.04em; }
.card h3 { margin: 6px 0 10px; font-size: 18px; }
.card p { color: var(--fg-soft); margin: 0; font-size: 14px; }

.lead { font-size: 18px; color: var(--fg-soft); max-width: 70ch; line-height: 1.6; }

/* CODE PREVIEW */
pre.code, pre.code-big {
  background: #050505; border: 1px solid var(--border); border-radius: 8px;
  padding: 24px; overflow-x: auto; font-family: var(--mono);
  font-size: 13px; line-height: 1.8; color: #d0d0d0; margin: 0;
  white-space: pre;
}
pre.code-big { font-size: 16px; padding: 32px; }

/* PRICING */
.price-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 8px;
  padding: 24px; text-align: center;
}
.price-card.highlight { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent); }
.price-card h3 { margin: 0; font-size: 18px; }
.price-card .price { font-size: 28px; font-weight: 700; color: var(--accent); margin: 12px 0 16px; }
.price-card ul { list-style: none; padding: 0; margin: 0; }
.price-card ul li { padding: 6px 0; color: var(--fg-soft); font-size: 14px; border-top: 1px solid var(--border); }
.price-card ul li:first-child { border-top: 0; }

/* FAQ */
.faq details {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 8px;
  padding: 16px 20px; margin-bottom: 12px;
}
.faq details summary { cursor: pointer; font-weight: 600; color: var(--fg); }
.faq details[open] summary { color: var(--accent); }
.faq details p { margin: 10px 0 0; color: var(--fg-soft); font-size: 14px; }

/* CTA */
.cta-block { text-align: center; padding-bottom: 80px; }
.cta-block pre.code-big { display: inline-block; text-align: left; margin: 16px 0; }

/* FOOTER */
footer { border-top: 1px solid var(--border); padding: 48px var(--pad); max-width: var(--max); margin: 0 auto; }
.foot-cols { display: grid; grid-template-columns: 1fr; gap: 32px; }
@media (min-width: 700px) { .foot-cols { grid-template-columns: 2fr 1fr 1fr 1fr; } }
.foot-h { font-size: 13px; color: var(--fg-muted); text-transform: uppercase; letter-spacing: 0.06em; margin: 0 0 8px; }
footer a { display: block; padding: 4px 0; color: var(--fg-soft); font-size: 14px; }
footer a:hover { color: var(--accent); }
.foot-bottom { text-align: center; margin-top: 32px; padding-top: 32px; border-top: 1px solid var(--border); }

/* Cursor blink */
#typer::after { content: "▍"; color: var(--accent); animation: blink 1s steps(2) infinite; }
@keyframes blink { 50% { opacity: 0; } }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  #typer::after { animation: none; }
}