:root {
  --bg: #ffffff;
  --bg-soft: #f5f7fb;
  --text: #172033;
  --muted: #5d6679;
  --line: #e2e6ee;
  --accent: #2456e8;
  --accent-soft: #eaf0ff;
  --ok: #15803d;
  --warn-bg: #fff7e6;
  --warn: #9a5b00;
  --radius: 14px;
  --max: 1080px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f131a;
    --bg-soft: #161b24;
    --text: #e7eaf0;
    --muted: #9aa3b5;
    --line: #283040;
    --accent: #6e9bff;
    --accent-soft: #1b2744;
    --ok: #4ade80;
    --warn-bg: #2d2413;
    --warn: #f5c16c;
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 16px/1.7 -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Pretendard", "Malgun Gothic", "Noto Sans KR", sans-serif;
  word-break: keep-all; overflow-wrap: anywhere;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; }
code { font: 0.9em "SFMono-Regular", Menlo, Consolas, monospace; background: var(--bg-soft); border: 1px solid var(--line); border-radius: 5px; padding: 0 5px; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 20px; }

/* 머리 */
.top { position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.top .wrap { display: flex; align-items: center; gap: 20px; height: 60px; }
.logo { display: flex; align-items: center; gap: 9px; font-weight: 700; color: var(--text); font-size: 17px; }
.logo:hover { text-decoration: none; }
.nav { display: flex; gap: 18px; margin-left: auto; font-size: 15px; }
.nav a { color: var(--muted); }
.nav a:hover, .nav a.on { color: var(--text); text-decoration: none; }
@media (max-width: 640px) { .nav .hide-sm { display: none; } }

/* 첫 화면 */
.hero { padding: 72px 0 56px; background: linear-gradient(180deg, var(--accent-soft), var(--bg)); }
.hero h1 { font-size: clamp(30px, 5vw, 46px); line-height: 1.25; margin: 0 0 16px; letter-spacing: -0.02em; }
.hero p.lead { font-size: 19px; color: var(--muted); max-width: 680px; margin: 0 0 28px; }
.btns { display: flex; flex-wrap: wrap; gap: 12px; }
.btn { display: inline-block; padding: 12px 22px; border-radius: 10px; font-weight: 600; border: 1px solid var(--line); color: var(--text); background: var(--bg); }
.btn:hover { text-decoration: none; border-color: var(--accent); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.checks { display: flex; flex-wrap: wrap; gap: 8px 20px; margin-top: 28px; color: var(--muted); font-size: 15px; padding: 0; list-style: none; }
.checks li::before { content: "✓ "; color: var(--ok); font-weight: 700; }

/* 절 */
section { padding: 64px 0; }
section.soft { background: var(--bg-soft); }
h2 { font-size: 28px; margin: 0 0 10px; letter-spacing: -0.01em; }
.sub { color: var(--muted); margin: 0 0 32px; }
.grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
@media (max-width: 900px) { .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 600px) { .grid { grid-template-columns: 1fr; } }
.card { background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
section.soft .card { background: var(--bg); }
.card h3 { margin: 0 0 8px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.ico { font-size: 26px; margin-bottom: 8px; display: block; }

.shots { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; }
@media (max-width: 800px) { .shots { grid-template-columns: 1fr; } }
.shot { margin: 0; }
.shot a { display: block; }
.shot img { display: block; width: 100%; aspect-ratio: 4 / 3; object-fit: cover; object-position: top left; border: 1px solid var(--line); border-radius: 12px; box-shadow: 0 8px 28px rgba(0, 0, 0, .08); transition: transform .15s; }
.shot a:hover img { transform: translateY(-2px); }
.shot figcaption { color: var(--muted); font-size: 14px; margin-top: 8px; }

.steps { counter-reset: s; list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; }
.steps li { counter-increment: s; position: relative; padding: 16px 18px 16px 62px; background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius); }
.steps li::before { content: counter(s); position: absolute; left: 18px; top: 14px; width: 30px; height: 30px; border-radius: 50%; background: var(--accent); color: #fff; font-weight: 700; display: grid; place-items: center; }
.steps b { display: block; }
.steps span { color: var(--muted); font-size: 15px; }

.plans { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 18px; }
.plan { border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; background: var(--bg); }
.plan.best { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.plan h3 { margin: 0 0 4px; }
.plan .price { color: var(--muted); margin: 0 0 14px; }
.plan ul { margin: 0; padding-left: 18px; }
.plan li { margin: 4px 0; }

.note { background: var(--warn-bg); color: var(--text); border-radius: var(--radius); padding: 20px 22px; }
.note b { color: var(--warn); }
.note ul { margin: 8px 0 0; padding-left: 20px; }

details.faq { border-bottom: 1px solid var(--line); padding: 14px 0; }
details.faq summary { cursor: pointer; font-weight: 600; list-style: none; }
details.faq summary::-webkit-details-marker { display: none; }
details.faq summary::before { content: "+ "; color: var(--accent); }
details.faq[open] summary::before { content: "− "; }
details.faq p { color: var(--muted); margin: 8px 0 0; }

.contact { text-align: center; }
.contact .btns { justify-content: center; }
.soon { color: var(--muted); font-size: 15px; }

footer { border-top: 1px solid var(--line); padding: 28px 0 40px; color: var(--muted); font-size: 14px; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 8px 22px; }
footer .ver { margin-left: auto; }

/* 문서 (가이드·변경 기록) */
.doc-layout { display: grid; grid-template-columns: 250px minmax(0, 1fr); gap: 40px; padding: 36px 20px 64px; max-width: var(--max); margin: 0 auto; }
.doc-nav { position: sticky; top: 76px; align-self: start; max-height: calc(100vh - 92px); overflow: auto; font-size: 15px; }
.doc-nav a { display: block; color: var(--muted); padding: 4px 8px; border-radius: 6px; }
.doc-nav a.on { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.doc-nav ul { list-style: none; padding: 0 0 6px 10px; margin: 0; font-size: 14px; display: none; }
.doc-nav a.on + ul { display: block; }
.doc-nav .sep { margin: 14px 8px 4px; color: var(--muted); font-size: 13px; }
.doc { min-width: 0; }
.doc h1 { font-size: 30px; margin: 0 0 20px; padding-bottom: 10px; border-bottom: 2px solid var(--accent); }
.doc h2 { font-size: 21px; margin: 34px 0 8px; scroll-margin-top: 80px; }
.doc h3 { font-size: 17px; margin: 24px 0 6px; scroll-margin-top: 80px; }
.doc table { border-collapse: collapse; margin: 12px 0; font-size: 15px; display: block; overflow-x: auto; }
.doc th, .doc td { border: 1px solid var(--line); padding: 7px 10px; text-align: left; vertical-align: top; }
.doc th { background: var(--bg-soft); }
.doc pre { background: var(--bg-soft); border: 1px solid var(--line); border-radius: 8px; padding: 12px 14px; overflow-x: auto; }
.doc pre code { border: 0; padding: 0; background: none; }
.doc blockquote { margin: 14px 0; padding: 8px 16px; border-left: 3px solid var(--accent); background: var(--accent-soft); }
.doc img { border: 1px solid var(--line); border-radius: 8px; }
.pager { display: flex; justify-content: space-between; gap: 12px; margin-top: 48px; padding-top: 18px; border-top: 1px solid var(--line); }
@media (max-width: 820px) {
  .doc-layout { grid-template-columns: 1fr; gap: 20px; }
  .doc-nav { position: static; max-height: none; border-bottom: 1px solid var(--line); padding-bottom: 12px; }
}