@font-face { font-family: 'Pretendard Variable'; src: url(assets/PretendardVariable.woff2) format('woff2-variations'); font-weight: 45 920; font-display: swap; }
:root {
  --bg: #f6f6f7; --surface: #fff; --surface-2: #f4f4f5; --border: #e6e6e9;
  --text: #17171a; --text-2: #4f4f57; --text-3: #8a8a93; --accent: #2563eb; --accent-soft: #eef3ff;
  --radius: 16px;
  color-scheme: light;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.6 'Pretendard Variable', Pretendard, -apple-system, BlinkMacSystemFont, 'Apple SD Gothic Neo', 'Malgun Gothic', system-ui, sans-serif; letter-spacing: -0.01em; word-break: keep-all; -webkit-font-smoothing: antialiased; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; display: block; }
.wrap { width: min(1120px, 100% - 32px); margin: 0 auto; }

.logo { position: relative; display: inline-block; flex: none; width: 30px; height: 30px; border-radius: 8px; background: linear-gradient(150deg, #78a9ff, #3b82f6 45%, #1d4ed8); }
.logo::before { content: ''; position: absolute; left: 36%; top: 25%; width: 33%; height: 49%; border-left: 3.4px solid #fff; border-bottom: 3.4px solid #fff; border-radius: 0 0 0 2px; }

header.top { position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: saturate(1.4) blur(12px); -webkit-backdrop-filter: saturate(1.4) blur(12px); border-bottom: 1px solid transparent; }
header.top .wrap { display: flex; align-items: center; gap: 10px; height: 60px; }
header.top .brand { display: flex; align-items: center; gap: 10px; font-weight: 750; color: var(--text); text-decoration: none; }
header.top nav { margin-left: auto; display: flex; gap: 22px; font-size: 14.5px; }
header.top nav a { color: var(--text-2); }

.hero { padding: 56px 0 24px; text-align: center; }
.badge { display: inline-flex; align-items: center; gap: 6px; padding: 5px 12px; border-radius: 999px; background: var(--surface); border: 1px solid var(--border); font-size: 13px; font-weight: 600; color: var(--text-2); }
.hero h1 { margin: 18px 0 0; font-size: clamp(34px, 6vw, 60px); line-height: 1.1; letter-spacing: -0.04em; font-weight: 820; }
.hero p.lead { margin: 16px auto 0; max-width: 620px; font-size: clamp(16px, 2.2vw, 19px); color: var(--text-2); }
.cta { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin-top: 28px; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; height: 48px; padding: 0 22px; border-radius: 12px; border: 1px solid var(--border); background: var(--surface); color: var(--text); font: inherit; font-size: 15.5px; font-weight: 650; cursor: pointer; text-decoration: none !important; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { background: #1d4ed8; }
.btn[aria-disabled='true'] { opacity: 0.55; pointer-events: none; }
.btn small { font-weight: 500; opacity: 0.8; font-size: 13px; }
.note { margin-top: 12px; font-size: 13.5px; color: var(--text-3); }

.mobile { display: none; max-width: 520px; margin: 24px auto 0; padding: 18px; border-radius: var(--radius); background: var(--surface); border: 1px solid var(--border); text-align: left; }
.mobile b { display: block; font-size: 16px; }
.mobile p { margin: 4px 0 12px; font-size: 14.5px; color: var(--text-2); }
.mobile .row { display: flex; gap: 8px; }
.mobile .row .btn { flex: 1; height: 44px; padding: 0 12px; font-size: 14.5px; }
.is-mobile .mobile { display: block; }
.is-mobile .desktop-only { display: none; }

.window { margin: 40px auto 0; max-width: 1040px; border-radius: 14px; overflow: hidden; background: #fff; box-shadow: 0 0 0 1px rgb(15 23 42 / 0.08), 0 40px 90px -30px rgb(30 58 138 / 0.4), 0 10px 30px -12px rgb(15 23 42 / 0.15); }
.window .bar { display: flex; align-items: center; gap: 7px; height: 34px; padding: 0 14px; background: var(--surface-2); border-bottom: 1px solid var(--border); }
.window .bar i { width: 11px; height: 11px; border-radius: 50%; background: #ff5f57; }
.window .bar i:nth-child(2) { background: #febc2e; } .window .bar i:nth-child(3) { background: #28c840; }
.window .bar span { margin-left: 10px; padding: 2px 12px; border-radius: 999px; background: #fff; font-size: 12px; color: var(--text-3); }

section { padding: 72px 0 0; }
section > .wrap > h2 { margin: 0; font-size: clamp(26px, 4vw, 38px); letter-spacing: -0.035em; line-height: 1.2; font-weight: 800; text-align: center; }
section > .wrap > p.sub { margin: 10px auto 0; max-width: 620px; text-align: center; color: var(--text-2); }

.features { display: grid; gap: 22px; margin-top: 36px; }
.feature { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr); gap: 28px; align-items: center; padding: 26px; border-radius: 20px; background: var(--surface); border: 1px solid var(--border); }
.feature:nth-child(even) { grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr); }
.feature:nth-child(even) .text { order: 2; }
.feature h3 { margin: 0; font-size: 22px; letter-spacing: -0.03em; }
.feature p { margin: 8px 0 0; color: var(--text-2); }
.feature img { border-radius: 12px; border: 1px solid var(--border); }

.minis { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; margin-top: 22px; }
.mini { padding: 18px; border-radius: var(--radius); background: var(--surface); border: 1px solid var(--border); }
.mini b { display: block; font-size: 15.5px; }
.mini span { display: block; margin-top: 4px; font-size: 14px; color: var(--text-2); line-height: 1.5; }

.safe { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; margin-top: 32px; }
.safe div { display: flex; gap: 12px; padding: 18px; border-radius: var(--radius); background: var(--surface); border: 1px solid var(--border); }
.safe i { flex: none; display: grid; place-items: center; width: 28px; height: 28px; border-radius: 50%; background: var(--accent-soft); color: var(--accent); font-style: normal; font-weight: 800; font-size: 14px; }
.safe b { display: block; }
.safe span { font-size: 14.5px; color: var(--text-2); }

details { margin-top: 10px; padding: 16px 20px; border-radius: 14px; background: var(--surface); border: 1px solid var(--border); }
details summary { cursor: pointer; font-weight: 650; list-style: none; }
details summary::-webkit-details-marker { display: none; }
details summary::after { content: '+'; float: right; color: var(--text-3); font-weight: 500; }
details[open] summary::after { content: '–'; }
details p { margin: 8px 0 0; color: var(--text-2); font-size: 15px; }
.faq { max-width: 760px; margin: 28px auto 0; }

.final { margin: 72px 0 0; padding: 44px 24px; border-radius: 24px; background: linear-gradient(140deg, #3b82f6, #1d4ed8); color: #fff; text-align: center; }
.final h2 { margin: 0; font-size: clamp(24px, 3.6vw, 34px); letter-spacing: -0.035em; }
.final p { margin: 8px 0 0; opacity: 0.88; }
.final .btn { border-color: transparent; }
.final .btn.primary { background: #fff; color: var(--accent); }

footer { margin-top: 64px; padding: 28px 0 44px; border-top: 1px solid var(--border); font-size: 13.5px; color: var(--text-3); }
footer .wrap { display: flex; flex-wrap: wrap; gap: 8px 22px; justify-content: space-between; }
footer nav { display: flex; gap: 18px; }
footer a { color: var(--text-2); }

/* text pages (privacy, support) */
.doc { max-width: 760px; margin: 40px auto 0; padding: 36px clamp(20px, 5vw, 48px); border-radius: 20px; background: var(--surface); border: 1px solid var(--border); }
.doc h1 { margin: 0; font-size: 32px; letter-spacing: -0.035em; }
.doc .date { margin-top: 6px; color: var(--text-3); font-size: 14px; }
.doc h2 { margin: 30px 0 6px; font-size: 19px; letter-spacing: -0.02em; }
.doc p, .doc li { color: var(--text-2); font-size: 15.5px; }
.doc ul { padding-left: 20px; }
.doc hr { margin: 40px 0; border: 0; border-top: 1px solid var(--border); }
.doc .lang { display: flex; gap: 12px; margin-top: 14px; font-size: 14px; }

@media (max-width: 820px) {
  header.top nav { display: none; }
  .hero { padding-top: 36px; }
  .feature, .feature:nth-child(even) { grid-template-columns: minmax(0, 1fr); padding: 18px; gap: 16px; }
  .feature:nth-child(even) .text { order: 0; }
  .minis { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .safe { grid-template-columns: minmax(0, 1fr); }
  .window { border-radius: 10px; }
  .window .bar { height: 26px; }
}
.mobile-cta { display: none !important; }
.is-mobile .mobile-cta { display: flex !important; }