:root {
  --bg: #0b0f1a;
  --bg-soft: #121829;
  --card: #161d31;
  --line: #232c45;
  --text: #e8ecf5;
  --muted: #9aa6c4;
  --accent: #4f8cff;
  --accent-2: #38e0b0;
  --radius: 16px;
  --maxw: 1080px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Apple SD Gothic Neo", "Noto Sans KR", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* Header */
header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(11,15,26,.82);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; color: var(--text); }
.brand .logo {
  width: 32px; height: 32px; border-radius: 9px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  display: grid; place-items: center; color: #06101e; font-weight: 800;
}
.nav-links { display: flex; align-items: center; gap: 22px; }
.nav-links a { color: var(--muted); font-size: 15px; }
.nav-links a:hover { color: var(--text); text-decoration: none; }

.lang-toggle {
  border: 1px solid var(--line); background: var(--card); color: var(--text);
  border-radius: 999px; padding: 6px 14px; font-size: 13px; cursor: pointer;
  font-weight: 600;
}
.lang-toggle:hover { border-color: var(--accent); }

/* Hero */
.hero { padding: 84px 0 60px; text-align: center; }
.hero h1 { font-size: 44px; line-height: 1.15; margin: 0 0 16px; letter-spacing: -.02em; }
.hero .grad { background: linear-gradient(135deg, var(--accent), var(--accent-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p { font-size: 19px; color: var(--muted); max-width: 640px; margin: 0 auto; }
.tagline { display:inline-block; margin-bottom:22px; padding:6px 14px; border:1px solid var(--line); border-radius:999px; font-size:13px; color:var(--accent-2); background:var(--bg-soft); }

/* Sections */
section { padding: 48px 0; }
h2 { font-size: 28px; margin: 0 0 8px; letter-spacing: -.01em; }
.section-sub { color: var(--muted); margin: 0 0 28px; }

/* App grid */
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.app-card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 20px; transition: .18s;
}
.app-card:hover { transform: translateY(-3px); border-color: var(--accent); }
.app-card .ico {
  width: 46px; height: 46px; border-radius: 12px; display: grid; place-items: center;
  font-size: 22px; margin-bottom: 12px;
  background: linear-gradient(135deg, #1d2742, #2a3658);
}
.app-card h3 { margin: 0 0 4px; font-size: 17px; }
.app-card p { margin: 0; color: var(--muted); font-size: 14px; }

.cat-label { font-size:13px; text-transform:uppercase; letter-spacing:.08em; color:var(--accent); margin: 28px 0 12px; font-weight:700; }

/* Content pages */
.doc { padding: 56px 0 80px; max-width: 800px; }
.doc h1 { font-size: 34px; margin: 0 0 6px; }
.doc .updated { color: var(--muted); font-size: 14px; margin-bottom: 32px; }
.doc h2 { font-size: 21px; margin: 34px 0 10px; }
.doc h3 { font-size: 17px; margin: 22px 0 8px; }
.doc p, .doc li { color: #c7d0e6; }
.doc ul { padding-left: 22px; }
.doc li { margin: 6px 0; }
.doc .box { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 18px 20px; margin: 18px 0; }
.doc code { background: var(--bg-soft); padding: 2px 6px; border-radius: 5px; font-size: 14px; }

/* Footer */
footer { border-top: 1px solid var(--line); padding: 40px 0; color: var(--muted); font-size: 14px; }
.foot-grid { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 24px; }
.foot-grid a { color: var(--muted); }
.foot-grid a:hover { color: var(--text); }
.company { max-width: 360px; }
.company strong { color: var(--text); }

/* Language visibility — JS 전엔 영어만(깜빡임 방지). app.js가 .lang-ready 추가 후 인라인 display로 제어(영어 폴백). 5개국어 */
html:not(.lang-ready) [data-lang]:not([data-lang="en"]) { display: none; }

/* 언어 선택 (en·한국어·日本語·中文·العربية) */
.lang-select {
  border: 1px solid var(--line); background: var(--card); color: var(--text);
  border-radius: 999px; padding: 6px 12px; font-size: 13px; cursor: pointer; font-weight: 600;
  -webkit-appearance: none; appearance: none;
}
.lang-select:hover { border-color: var(--accent); }
html[dir="rtl"] .caps, html[dir="rtl"] .bridge, html[dir="rtl"] .doc { direction: rtl; }

@media (max-width: 760px) {
  .hero h1 { font-size: 32px; }
  .grid { grid-template-columns: 1fr; }
  .nav-links { gap: 14px; }
  .nav-links a:not(.lang-wrap a) { display: none; }
}