:root {
  --blue: #2563eb;
  --blue-d: #1d4ed8;
  --blue-l: #eff6ff;
  --ink: #0f172a;
  --text: #334155;
  --muted: #64748b;
  --line: #e2e8f0;
  --bg: #ffffff;
  --bg-alt: #f8fafc;
  --amber: #fffbeb;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(15, 23, 42, .08);
  font-family: Pretendard, "Apple SD Gothic Neo", "Malgun Gothic", "Noto Sans KR", "Noto Sans CJK KR", system-ui, sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body { margin: 0; color: var(--text); background: var(--bg); line-height: 1.7; font-size: 16px; word-break: keep-all; overflow-wrap: anywhere; }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--blue); }
code, kbd { font-family: ui-monospace, "SF Mono", Consolas, monospace; font-size: .88em; background: #f1f5f9; border: 1px solid var(--line); border-radius: 6px; padding: 1px 6px; color: var(--ink); }
kbd { background: #fff; box-shadow: 0 1px 0 var(--line); }
h1, h2, h3 { color: var(--ink); line-height: 1.3; letter-spacing: -.01em; }
.wrap { width: min(1120px, 100% - 32px); margin: 0 auto; }
.narrow { width: min(760px, 100% - 32px); }

/* 상단 막대 */
.topbar { position: sticky; top: 0; z-index: 10; background: rgba(255, 255, 255, .92); backdrop-filter: saturate(1.4) blur(8px); border-bottom: 1px solid var(--line); }
.topbar-in { display: flex; align-items: center; gap: 24px; height: 60px; }
.brand { display: flex; align-items: center; gap: 8px; font-weight: 800; color: var(--ink); text-decoration: none; font-size: 18px; margin: 0; }
.nav { display: flex; gap: 20px; margin-left: auto; }
.nav a { color: var(--text); text-decoration: none; font-size: 15px; }
.nav a:hover { color: var(--blue); }

/* 버튼 */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; background: var(--blue); color: #fff; text-decoration: none; font-weight: 700; padding: 12px 22px; border-radius: 10px; border: 2px solid var(--blue); transition: background .15s, transform .15s; }
.btn:hover { background: var(--blue-d); border-color: var(--blue-d); transform: translateY(-1px); }
.btn-ghost { background: #fff; color: var(--blue); }
.btn-ghost:hover { background: var(--blue-l); color: var(--blue-d); }
.btn-small { padding: 7px 14px; font-size: 14px; }
.size { font-weight: 500; opacity: .8; font-size: .85em; }

/* 첫 화면 */
.hero { background: linear-gradient(180deg, var(--blue-l), #fff 85%); padding: 64px 0 40px; }
.hero-in { display: grid; grid-template-columns: 1fr 1.1fr; gap: 48px; align-items: center; }
.eyebrow { color: var(--blue); font-weight: 700; margin: 0 0 8px; }
.hero h1 { font-size: clamp(30px, 4.2vw, 46px); margin: 0 0 16px; }
.hl { color: var(--blue); }
.lead { font-size: 18px; margin: 0 0 24px; }
.cta { display: flex; flex-wrap: wrap; gap: 12px; margin: 0 0 16px; }
.meta { color: var(--muted); font-size: 14px; }
.center { text-align: center; }
.hero-shot { margin: 0; }
.hero-shot img { border-radius: var(--radius); box-shadow: var(--shadow); border: 1px solid var(--line); }
.hero-shot figcaption { color: var(--muted); font-size: 13px; text-align: center; margin-top: 8px; }

/* 흐름 */
.flow-sec { padding: 8px 0 24px; }
.flow { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(6, 1fr); gap: 10px; counter-reset: none; }
.flow li { background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 14px 10px; text-align: center; position: relative; }
.flow li:not(:last-child)::after { content: "›"; position: absolute; right: -10px; top: 50%; transform: translateY(-50%); color: var(--muted); font-size: 20px; }
.flow .num { display: inline-grid; place-items: center; width: 26px; height: 26px; border-radius: 50%; background: var(--blue); color: #fff; font-weight: 700; font-size: 13px; margin-bottom: 4px; }
.flow b { display: block; color: var(--ink); }
.flow small { color: var(--muted); font-size: 12.5px; }

/* 구역 */
.sec { padding: 72px 0; }
.sec-alt { background: var(--bg-alt); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.sec h2 { font-size: clamp(26px, 3vw, 34px); margin: 0 0 12px; text-align: center; }
.sec-lead { text-align: center; margin: 0 0 40px; color: var(--muted); }
.sub { margin: 48px 0 16px; font-size: 20px; }

.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 36px; }
.card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.card h3 { margin: 8px 0 8px; font-size: 18px; }
.card p { margin: 0; font-size: 15px; }
.ico { font-size: 28px; }

/* 사용법 */
.step { display: grid; grid-template-columns: 1fr 1.25fr; gap: 40px; align-items: center; padding: 32px 0; border-bottom: 1px dashed var(--line); }
.step:last-child { border-bottom: 0; }
.step:nth-child(even of .step) .step-text { order: 2; }
.step > *, .demo > *, .share > *, .hero-in > * { min-width: 0; }
.step-no { color: var(--blue); font-weight: 800; margin: 0; }
.step h3 { font-size: 22px; margin: 4px 0 12px; }
.step p { margin: 0 0 12px; }
.note { background: var(--amber); border: 1px solid #fde68a; border-radius: 10px; padding: 10px 14px; font-size: 14.5px; }
.step-shots { display: grid; grid-template-columns: minmax(0, 1fr); gap: 12px; justify-items: center; }
.step-shots img { border-radius: 12px; border: 1px solid var(--line); box-shadow: var(--shadow); background: #fff; }
.shot-small { max-width: min(420px, 100%); }

/* 체험 */
.demo { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
.demo h2 { text-align: left; }
.demo img { border-radius: var(--radius); box-shadow: var(--shadow); border: 1px solid var(--line); }

/* 다운로드 */
.os-hint { text-align: center; background: var(--blue-l); border: 1px solid #bfdbfe; color: var(--blue-d); border-radius: 10px; padding: 8px 14px; margin: -24px auto 24px; width: fit-content; max-width: 100%; }
.grid-dl { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.dl { background: #fff; border: 2px solid var(--line); border-radius: var(--radius); padding: 22px; display: flex; flex-direction: column; }
.dl h3 { margin: 0 0 6px; font-size: 19px; }
.dl p { margin: 0 0 18px; color: var(--muted); font-size: 14.5px; flex: 1; }
.dl .btn { width: 100%; }
.dl.recommended { border-color: var(--blue); box-shadow: 0 0 0 4px var(--blue-l); }
.dl.recommended h3::after { content: "추천"; margin-left: 8px; font-size: 12px; background: var(--blue); color: #fff; border-radius: 999px; padding: 2px 8px; vertical-align: middle; }
.install { display: grid; gap: 10px; }
details { background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 0 18px; }
details + details { margin-top: 0; }
summary { cursor: pointer; font-weight: 700; color: var(--ink); padding: 14px 0; }
details[open] summary { border-bottom: 1px solid var(--line); }
details ol, details p { margin: 12px 0 16px; }
details li { margin: 4px 0; }
#faq details { margin-bottom: 10px; }

/* 배포 */
.share { display: grid; grid-template-columns: 1fr 1.2fr; gap: 36px; align-items: start; }
.big-steps { margin: 0; padding-left: 22px; }
.big-steps li { margin: 0 0 14px; }
.share img { border-radius: 12px; border: 1px solid var(--line); box-shadow: var(--shadow); }

/* 바닥글 */
.footer { border-top: 1px solid var(--line); padding: 32px 0; }
.footer-in { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; align-items: center; }
.footer nav { display: flex; gap: 20px; flex-wrap: wrap; }
.footer nav a { color: var(--text); text-decoration: none; }
.footer .meta { margin: 4px 0 0; }

@media (max-width: 960px) {
  .nav { display: none; }
  .topbar-in .btn-small { margin-left: auto; }
  .hero-in, .step, .demo, .share { grid-template-columns: minmax(0, 1fr); gap: 24px; }
  .step:nth-child(even of .step) .step-text { order: 0; }
  .grid3 { grid-template-columns: repeat(2, 1fr); }
  .grid-dl { grid-template-columns: repeat(2, 1fr); }
  .flow { grid-template-columns: repeat(3, 1fr); }
  .flow li::after { display: none; }
}
@media (max-width: 560px) {
  .hero { padding-top: 36px; }
  .grid3, .grid-dl { grid-template-columns: 1fr; }
  .flow { grid-template-columns: repeat(2, 1fr); }
  .sec { padding: 52px 0; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } .btn { transition: none; } }