/* 오토 뤼튼 포스트 — 공개 소개 사이트 (v2.8) */

:root {
  --font-sans: "Pretendard Variable", "Pretendard", "IBM Plex Sans KR", "Apple SD Gothic Neo", "Malgun Gothic", system-ui, sans-serif;
  --font-serif: var(--font-sans);
  --bg: #ffffff; --bg-alt: #f5f6fa; --card: #ffffff;
  --ink: #14161f; --muted: #5d6478; --line: #e7e9f1; --line-strong: #d3d7e4;
  --primary: #4f46e5; --primary-hover: #4038c9; --primary-ink: #ffffff; --primary-soft: #eef0ff;
  --accent: #8b5cf6;
  --deep: #14163a; --deep-ink: #e6e8ff;
  --signal: #f5a524;
  --ok: #12804a; --ok-soft: #dff5e8; --err: #c0271b; --err-soft: #fde7e4;
  --r-s: 10px; --r-m: 16px; --r-l: 24px;
  --shadow: 0 1px 2px rgba(20,22,40,.04), 0 8px 28px rgba(40,40,120,.07);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0e1018; --bg-alt: #121520; --card: #171a28;
    --ink: #eceef7; --muted: #9aa1b8; --line: #242838; --line-strong: #353a50;
    --primary: #8b87ff; --primary-hover: #a3a0ff; --primary-ink: #0c0d1c; --primary-soft: #222650;
    --deep: #0a0b1a; --deep-ink: #dcdfff;
    --ok: #6ad39b; --ok-soft: #173326; --err: #ff8b80; --err-soft: #3d1b18;
    --shadow: 0 1px 2px rgba(0,0,0,.3);
  }
}
:root[data-theme="dark"] {
  --bg: #0e1018; --bg-alt: #121520; --card: #171a28;
  --ink: #eceef7; --muted: #9aa1b8; --line: #242838; --line-strong: #353a50;
  --primary: #8b87ff; --primary-hover: #a3a0ff; --primary-ink: #0c0d1c; --primary-soft: #222650;
  --deep: #0a0b1a; --deep-ink: #dcdfff;
  --ok: #6ad39b; --ok-soft: #173326; --err: #ff8b80; --err-soft: #3d1b18;
  --shadow: 0 1px 2px rgba(0,0,0,.3);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 76px; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 400 16px/1.7 var(--font-sans); letter-spacing: -.01em; -webkit-font-smoothing: antialiased; }
h1, h2, h3, p, ul, ol, dl, dd { margin: 0; padding: 0; }
a { color: inherit; }
:focus-visible { outline: 2px solid var(--signal); outline-offset: 2px; }
.s-wrap { width: min(1120px, 100% - 32px); margin-inline: auto; }
.s-narrow { width: min(760px, 100% - 32px); }

/* 헤더 */
.s-head { position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.s-head-in { display: flex; align-items: center; gap: 24px; height: 64px; }
.s-logo { display: inline-flex; align-items: center; gap: 10px; font: 800 18px var(--font-sans); letter-spacing: -.03em; text-decoration: none; color: var(--ink); }
.s-mark { width: 14px; height: 14px; background: linear-gradient(135deg, var(--primary), var(--accent)); border-radius: 4px; transform: rotate(45deg); }
.s-nav { display: flex; gap: 4px; margin-left: 8px; }
.s-nav a { padding: 8px 12px; border-radius: var(--r-s); text-decoration: none; color: var(--muted); font-weight: 500; font-size: 15px; }
.s-nav a:hover { color: var(--ink); background: var(--bg-alt); }
.s-nav a[aria-current] { color: var(--primary); background: var(--primary-soft); }
.s-head-cta { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.s-link { text-decoration: none; font-weight: 500; padding: 8px 10px; }
.s-theme { display: grid; place-items: center; width: 38px; height: 38px; border: 1px solid var(--line); background: transparent; color: var(--muted); border-radius: var(--r-s); cursor: pointer; }
.s-theme:hover { color: var(--ink); border-color: var(--line-strong); }

/* 버튼 */
.s-btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; padding: 9px 18px; border-radius: var(--r-s); border: 1px solid transparent; font: 600 15px var(--font-sans); text-decoration: none; cursor: pointer; transition: background .15s, border-color .15s; }
.s-btn-primary { background: var(--primary); color: var(--primary-ink); box-shadow: 0 4px 14px color-mix(in srgb, var(--primary) 35%, transparent); }
.s-btn-primary:hover { background: var(--primary-hover); }
.s-btn-ghost { border-color: var(--line-strong); color: var(--ink); background: transparent; }
.s-btn-ghost:hover { background: var(--bg-alt); }
.s-btn-light { background: #fff; color: #14163a; }
.s-btn-light:hover { background: #e6e8ff; }
.s-btn-lg { padding: 14px 28px; font-size: 16px; border-radius: 12px; }

/* 히어로 */
.s-hero { padding: 104px 0 80px; text-align: center; background:
  radial-gradient(700px 360px at 15% -5%, color-mix(in srgb, var(--accent) 18%, transparent), transparent 70%),
  radial-gradient(800px 380px at 88% -10%, color-mix(in srgb, var(--primary) 20%, transparent), transparent 70%),
  var(--bg); }
.s-eyebrow { display: inline-block; color: var(--primary); background: var(--primary-soft); font-weight: 700; font-size: 13.5px; padding: 5px 14px; border-radius: 999px; margin-bottom: 22px; }
.s-hero h1 { font: 800 clamp(36px, 6vw, 64px)/1.18 var(--font-sans); letter-spacing: -.04em; max-width: 14em; margin-inline: auto; }
.s-hero h1 { background: linear-gradient(120deg, var(--ink) 40%, var(--primary)); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.s-lede { margin: 24px auto 0; max-width: 38em; color: var(--muted); font-size: 18px; }
.s-cta { margin-top: 36px; display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; }
.s-fine { margin-top: 14px; color: var(--muted); font-size: 14px; }
.s-stats { margin-top: 64px; text-align: left; display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; border: 1px solid var(--line); border-radius: var(--r-l); background: var(--card); box-shadow: var(--shadow); overflow: hidden; }
.s-stats > div { padding: 22px 24px; border-left: 1px solid var(--line); }
.s-stats > div:first-child { border-left: 0; }
.s-stats dt { font: 800 36px/1.1 var(--font-sans); letter-spacing: -.03em; color: var(--primary); }
.s-stats dd { margin-top: 8px; color: var(--muted); font-size: 14px; line-height: 1.5; }

/* 섹션 */
.s-sec { padding: 96px 0; }
.s-sec-alt { background: var(--bg-alt); }
.s-sec h2 { font: 800 clamp(26px, 3.6vw, 40px)/1.3 var(--font-sans); letter-spacing: -.035em; }
.s-sub { margin-top: 12px; color: var(--muted); max-width: 42em; }
.s-note { margin-top: 20px; color: var(--muted); font-size: 14px; }
.s-grid { display: grid; gap: 18px; margin-top: 36px; }
.s-grid-3 { grid-template-columns: repeat(3, 1fr); }
.s-grid-4 { grid-template-columns: repeat(4, 1fr); }
.s-grid-plans { grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); }
.s-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--r-m); padding: 28px; box-shadow: var(--shadow); transition: transform .18s, border-color .18s; }
.s-card:hover { transform: translateY(-3px); border-color: color-mix(in srgb, var(--primary) 40%, var(--line)); }
.s-card h3 { font: 700 18px/1.4 var(--font-sans); margin-bottom: 8px; }
.s-card p { color: var(--muted); font-size: 15px; }
.s-ico { display: inline-grid; place-items: center; width: 42px; height: 42px; border-radius: 12px; background: var(--primary-soft); color: var(--primary); margin-bottom: 16px; }

.s-steps { list-style: none; counter-reset: s; display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 36px; }
.s-steps li { counter-increment: s; position: relative; padding: 28px; background: var(--card); border: 1px solid var(--line); border-radius: var(--r-m); box-shadow: var(--shadow); }
.s-steps li::before { content: counter(s); display: grid; place-items: center; width: 36px; height: 36px; font: 800 16px var(--font-sans); color: var(--primary-ink); background: linear-gradient(135deg, var(--primary), var(--accent)); border-radius: 50%; margin-bottom: 14px; }
.s-steps b { display: block; font-size: 18px; margin-bottom: 6px; }
.s-steps span { color: var(--muted); font-size: 15px; }

/* 요금제 */
.s-plan { position: relative; display: flex; flex-direction: column; gap: 14px; background: var(--card); border: 1px solid var(--line); border-radius: var(--r-m); padding: 30px 26px; box-shadow: var(--shadow); }
.s-plan h3 { font: 600 18px var(--font-sans); }
.s-plan-hot { border: 2px solid var(--primary); box-shadow: 0 12px 40px color-mix(in srgb, var(--primary) 22%, transparent); }
.s-badge { position: absolute; top: -12px; right: 18px; background: var(--signal); color: #2a1c00; font: 700 12px var(--font-sans); padding: 3px 10px; border-radius: 999px; }
.s-price { font: 800 30px/1.2 var(--font-sans); letter-spacing: -.035em; }
.s-plan ul { list-style: none; display: grid; gap: 8px; color: var(--muted); font-size: 15px; flex: 1; margin-bottom: 8px; }
.s-plan li::before { content: "✓"; color: var(--ok); font-weight: 700; margin-right: 8px; }

/* FAQ */
.s-faq { border-bottom: 1px solid var(--line-strong); }
.s-faq:first-of-type { margin-top: 28px; border-top: 1px solid var(--line-strong); }
.s-faq summary { cursor: pointer; padding: 18px 28px 18px 0; font-weight: 600; list-style: none; position: relative; }
.s-faq summary::-webkit-details-marker { display: none; }
.s-faq summary::after { content: "+"; position: absolute; right: 4px; top: 14px; font-size: 24px; color: var(--muted); font-weight: 400; }
.s-faq[open] summary::after { content: "–"; }
.s-faq p { padding: 0 0 20px; color: var(--muted); }

/* 마무리 CTA */
.s-final { background: radial-gradient(600px 300px at 50% 0, color-mix(in srgb, var(--primary) 45%, transparent), transparent 70%), var(--deep); color: var(--deep-ink); text-align: center; padding: 88px 0; }
.s-final h2 { font: 800 clamp(26px, 3.6vw, 40px)/1.3 var(--font-sans); letter-spacing: -.035em; }
.s-final p { margin: 10px 0 26px; opacity: .8; }

/* 문의 / 약관 */
.s-page { min-height: 60vh; }
.s-page h1 { font: 800 clamp(28px, 4vw, 40px)/1.3 var(--font-sans); letter-spacing: -.035em; }
.s-doc { margin-top: 28px; color: var(--ink); line-height: 1.85; }
.s-form { display: grid; gap: 18px; margin-top: 28px; }
.s-form label { display: grid; gap: 6px; font-weight: 600; font-size: 14px; }
.s-form input, .s-form select, .s-form textarea { font: 400 16px var(--font-sans); color: var(--ink); background: var(--card); border: 1px solid var(--line-strong); border-radius: var(--r-s); padding: 12px 14px; width: 100%; }
.s-form input:focus, .s-form select:focus, .s-form textarea:focus { outline: 3px solid color-mix(in srgb, var(--primary) 28%, transparent); border-color: var(--primary); }
.s-form textarea { resize: vertical; min-height: 140px; }
.s-form .s-btn { justify-self: start; }
.s-hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.s-alert { margin-top: 24px; padding: 12px 14px; border-radius: var(--r-s); font-size: 15px; }
.s-alert-ok { background: var(--ok-soft); color: var(--ok); }
.s-alert-err { background: var(--err-soft); color: var(--err); }

/* 푸터 */
.s-foot { background: var(--bg-alt); border-top: 1px solid var(--line); padding: 48px 0 32px; color: var(--muted); font-size: 14px; }
.s-foot-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 28px; }
.s-foot h3 { font: 600 14px var(--font-sans); color: var(--ink); margin-bottom: 10px; }
.s-foot a { display: block; text-decoration: none; padding: 3px 0; }
.s-foot a:hover { color: var(--ink); text-decoration: underline; }
.s-foot-note { margin-top: 12px; max-width: 28em; line-height: 1.6; }
.s-biz { margin-top: 32px; padding-top: 20px; border-top: 1px solid var(--line); font-size: 13px; line-height: 1.7; }
.s-biz p + p { margin-top: 6px; }

@media (max-width: 900px) {
  .s-grid-3, .s-steps { grid-template-columns: 1fr; }
  .s-grid-4 { grid-template-columns: 1fr 1fr; }
  .s-stats { grid-template-columns: 1fr 1fr; }
  .s-stats > div:nth-child(3) { border-left: 0; }
  .s-stats > div:nth-child(n+3) { border-top: 1px solid var(--line); }
  .s-foot-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .s-nav { display: none; }
  .s-hero { padding: 64px 0 48px; }
  .s-sec { padding: 56px 0; }
  .s-grid-4 { grid-template-columns: 1fr; }
  .s-head-in { gap: 12px; }
  .s-logo { font-size: 16px; }
  .s-head-cta .s-link { display: none; }
  .s-foot-grid { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }