:root{
  --bg-dark: #0B0E17;
  --bg-dark-2: #131829;
  --purple: #8B5CF6;
  --blue: #4C8DFF;
  --text-light: #F5F6FA;
  --text-dim: #9AA3B5;

  --paper: #F6F7F9;
  --panel: #FFFFFF;
  --ink: #12172A;
  --ink-soft: #565F72;
  --line: #E4E7EC;

  --trust: #14B8A6;
  --trust-bg: #E4F6F3;

  --cat-game: #EF4444; --cat-game-bg: #FCE8E8;
  --cat-edu: #14B8A6; --cat-edu-bg: #E1F6F3;
  --cat-util: #4C8DFF; --cat-util-bg: #E7EFFE;
  --cat-work: #8B5CF6; --cat-work-bg: #F0EAFD;

  --shadow: rgba(18,23,42,0.08);
  --shadow-lg: rgba(18,23,42,0.18);
}
*{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0; background: var(--paper); color: var(--ink);
  font-family: 'Pretendard', -apple-system, 'Malgun Gothic', sans-serif;
  -webkit-font-smoothing: antialiased; line-height:1.6;
}
.mono{ font-family:'IBM Plex Mono', monospace; }
.wrap{ max-width: 1180px; margin: 0 auto; padding: 0 32px; }
a{ color:inherit; text-decoration:none; }
img{ max-width:100%; display:block; }

/* ---------- Header (on dark) ---------- */
header{
  position: sticky; top:0; z-index:30;
  background: rgba(11,14,23,0.75);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
header .inner{ display:flex; align-items:center; justify-content:space-between; padding: 16px 0; }
.logo{ font-weight:800; font-size: 18px; letter-spacing:-0.3px; display:flex; align-items:center; gap:9px; color:var(--text-light); }
.logo .mark{
  width:28px; height:28px; border-radius:8px;
  background: linear-gradient(135deg, var(--purple), var(--blue));
  display:flex; align-items:center; justify-content:center;
  color:#fff; font-size:13px; font-weight:800;
}
nav{ display:flex; align-items:center; gap:4px; }
nav a{ color: var(--text-dim); font-size: 14px; font-weight:500; padding: 8px 14px; border-radius: 6px; }
nav a:hover{ color: var(--text-light); background: rgba(255,255,255,0.06); }
nav a.active{ color: var(--text-light); }
nav a.cta{
  background: rgba(255,255,255,0.08); color:var(--text-light); font-weight:600;
  margin-left: 10px; border: 1px solid rgba(255,255,255,0.14);
  display:flex; align-items:center; gap:6px;
}
nav a.cta:hover{ background: rgba(255,255,255,0.14); }

/* ---------- Home Hero (dark) ---------- */
.hero{
  position:relative; overflow:hidden;
  background: radial-gradient(circle at 78% 20%, rgba(139,92,246,0.35), transparent 45%),
              radial-gradient(circle at 95% 60%, rgba(76,141,255,0.28), transparent 50%),
              var(--bg-dark);
  padding: 76px 0 60px; color: var(--text-light);
}
.hero-grid{ display:grid; grid-template-columns: 1.05fr 0.95fr; gap: 40px; align-items:center; }
.badge{
  display:inline-flex; align-items:center; gap:8px;
  font-size: 12.5px; font-weight:600; color: #D9C9FF;
  background: rgba(139,92,246,0.14); border: 1px solid rgba(139,92,246,0.35);
  padding: 7px 14px; border-radius: 20px; margin-bottom: 26px;
}
h1{ font-size: 52px; font-weight: 800; line-height: 1.18; letter-spacing: -1px; margin: 0 0 22px; }
h1 .grad{ background: linear-gradient(90deg, var(--purple), var(--blue)); -webkit-background-clip:text; background-clip:text; color:transparent; }
.hero p.lead{ font-size: 16.5px; color: var(--text-dim); max-width: 46ch; margin: 0 0 34px; }
.hero-actions{ display:flex; gap:12px; margin-bottom: 44px; flex-wrap:wrap; }
.btn{ display:inline-flex; align-items:center; gap:8px; font-size: 14.5px; font-weight:700; padding: 14px 24px; border-radius: 8px; transition: transform .15s ease, box-shadow .15s ease, background .15s ease; }
.btn-primary{ background: linear-gradient(90deg, var(--purple), var(--blue)); color: #fff; }
.btn-primary:hover{ transform: translateY(-2px); box-shadow: 0 14px 26px rgba(139,92,246,0.35); }
.btn-ghost-dark{ background: rgba(255,255,255,0.06); color: var(--text-light); border: 1px solid rgba(255,255,255,0.16); }
.btn-ghost-dark:hover{ border-color: rgba(255,255,255,0.4); }
.btn-dark-cta{ background: var(--ink); color:#fff; }
.btn-dark-cta:hover{ background:#232a42; transform: translateY(-2px); box-shadow: 0 12px 22px var(--shadow-lg); }

.stat-row-dark{ display:flex; gap: 34px; flex-wrap:wrap; }
.stat-d .num{ font-size: 24px; font-weight:800; }
.stat-d .label{ font-size: 12.5px; color: var(--text-dim); margin-top:2px; }

/* phone mockup */
.phone-wrap{ display:flex; justify-content:center; position:relative; }
.phone{
  width: 290px; border-radius: 40px;
  background: linear-gradient(180deg, #1A2036, #0E1220);
  border: 8px solid #1E2438;
  box-shadow: 0 30px 60px rgba(0,0,0,0.5);
  padding: 20px 16px;
}
.phone-header{ text-align:center; font-size:13px; font-weight:700; color: var(--text-light); margin-bottom: 16px; letter-spacing:-0.2px; }
.phone-grid{ display:grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.app-icon{ display:flex; flex-direction:column; align-items:center; gap:6px; }
.app-icon .sq{
  width: 56px; height:56px; border-radius: 14px;
  display:flex; align-items:center; justify-content:center;
  font-size: 22px; box-shadow: 0 6px 14px rgba(0,0,0,0.3);
  position:relative; overflow:hidden;
}
.app-icon .sq img{ position:absolute; inset:0; width:100%; height:100%; object-fit:cover; }
.app-icon .lbl{ font-size: 9.5px; color: var(--text-dim); text-align:center; line-height:1.3; }
.phone-dots{ display:flex; justify-content:center; gap:5px; margin-top: 18px; }
.phone-dots span{ width:5px; height:5px; border-radius:50%; background: rgba(255,255,255,0.25); }
.phone-dots span.on{ background: var(--purple); width:14px; border-radius:4px; }

/* ---------- Inner page hero (about/contact/apps/detail) ---------- */
.page-hero{
  background: radial-gradient(circle at 85% 10%, rgba(139,92,246,0.25), transparent 45%), var(--bg-dark);
  color: var(--text-light);
  padding: 56px 0 44px;
}
.page-hero .eyebrow{ color:#D9C9FF; }
.page-hero h1{ font-size: 36px; margin: 0 0 12px; }
.page-hero p{ color: var(--text-dim); font-size: 15px; max-width: 60ch; margin:0; }
.breadcrumb{ font-size:12.5px; color: var(--text-dim); margin-bottom:16px; }
.breadcrumb a:hover{ color: var(--text-light); }

/* ---------- Values ---------- */
.values{ background: var(--panel); padding: 68px 0; border-bottom: 1px solid var(--line); }
.eyebrow{ font-size: 12.5px; letter-spacing: 1.6px; text-transform:uppercase; color: var(--trust); font-weight:700; margin-bottom: 14px; }
.values h2{ font-size: 27px; font-weight:800; margin:0; letter-spacing:-0.4px; }
.values-grid{ display:grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 30px; }
.value-card{ background: var(--paper); border: 1px solid var(--line); border-radius: 14px; padding: 24px; }
.value-card .n{ font-size:12px; color: var(--ink-soft); margin-bottom: 12px; }
.value-card h3{ font-size: 16px; margin: 0 0 8px; font-weight:700; }
.value-card p{ font-size: 13.5px; color: var(--ink-soft); margin:0; }

/* ---------- Products ---------- */
.section-head{ padding: 68px 0 0; }
.section-head h2{ font-size: 29px; font-weight:800; margin:0 0 8px; letter-spacing:-0.4px; }
.section-head p{ color: var(--ink-soft); font-size:15px; margin:0; max-width:56ch; }
.tabs{ display:flex; gap:8px; margin: 26px 0 0; flex-wrap:wrap; }
.tab{ font-size: 13.5px; font-weight:600; padding: 9px 17px; border-radius: 20px; border: 1px solid var(--line); background: var(--panel); color: var(--ink-soft); cursor:pointer; }
.tab.active{ background: var(--ink); color:#fff; border-color: var(--ink); }

.grid{ display:grid; grid-template-columns: repeat(3, 1fr); gap: 18px; padding: 26px 0 74px; }
.card{ background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 22px; display:flex; flex-direction:column; gap:14px; transition: transform .15s ease, box-shadow .15s ease; }
.card:hover{ transform: translateY(-3px); box-shadow: 0 16px 30px var(--shadow); }
.card-top{ display:flex; align-items:flex-start; justify-content:space-between; }
.icon{ width: 50px; height:50px; border-radius: 14px; display:flex; align-items:center; justify-content:center; font-size: 22px; box-shadow: 0 6px 14px rgba(0,0,0,0.12); }
.icon.lg{ width:72px; height:72px; border-radius:18px; font-size:32px; }
.icon-slot{ position:relative; width:50px; height:50px; border-radius:14px; overflow:hidden; flex-shrink:0; box-shadow: 0 6px 14px rgba(0,0,0,0.12); }
.icon-slot.lg{ width:72px; height:72px; border-radius:18px; }
.icon-slot .icon{ width:100%; height:100%; border-radius:0; box-shadow:none; }
.icon-slot img{ position:absolute; inset:0; width:100%; height:100%; object-fit:cover; }
.cat-chip{ font-size: 10.5px; font-weight:700; padding: 5px 10px; border-radius: 20px; }
.cat-chip.game{ background: var(--cat-game-bg); color: var(--cat-game); }
.cat-chip.edu{ background: var(--cat-edu-bg); color: var(--cat-edu); }
.cat-chip.util{ background: var(--cat-util-bg); color: var(--cat-util); }
.cat-chip.work{ background: var(--cat-work-bg); color: var(--cat-work); }
.card h3{ margin:0; font-size: 16.5px; font-weight:700; letter-spacing:-0.2px; }
.card p.desc{ margin:0; font-size: 13.5px; color: var(--ink-soft); flex-grow:1; }
.card-foot{ display:flex; align-items:center; justify-content:space-between; padding-top: 14px; border-top: 1px solid var(--line); }
.store-link{ font-size: 12.5px; font-weight:700; color: var(--ink); display:flex; align-items:center; gap:5px; }
.store-link:hover{ color: var(--purple); }
.no-collect{ font-size: 10.5px; color: var(--trust); font-weight:600; display:flex; align-items:center; gap:4px; }
.no-collect .dot{ width:5px; height:5px; border-radius:50%; background:var(--trust); display:inline-block; }

/* ---------- About (dark) ---------- */
.about{ background: var(--bg-dark-2); color: var(--text-light); padding: 76px 0; }
.about .eyebrow{ color: #C4A6FF; }
.about h2{ font-size: 29px; font-weight:800; margin: 0 0 18px; max-width: 26ch; letter-spacing:-0.4px; }
.about p{ color: var(--text-dim); font-size: 15px; max-width: 62ch; margin: 0 0 14px; }
.about-grid{ display:grid; grid-template-columns: 1.2fr 1fr; gap: 48px; }
.tech-list{ display:flex; flex-wrap:wrap; gap:8px; margin-top: 16px; }
.tech-list span{ font-size: 12.5px; padding: 8px 14px; border-radius:20px; border: 1px solid rgba(255,255,255,0.14); color: var(--text-dim); }
.about-side h4{ font-size:12px; text-transform:uppercase; letter-spacing:1.2px; color:#7A8399; margin: 0 0 4px; font-weight:600; }

/* ---------- Simple content section (light) ---------- */
.content{ padding: 64px 0; }
.content h2{ font-size:24px; font-weight:800; margin: 0 0 14px; letter-spacing:-0.3px; }
.content h3{ font-size:17px; font-weight:700; margin: 28px 0 10px; }
.content p{ font-size:14.5px; color: var(--ink-soft); margin: 0 0 12px; max-width:70ch; }
.content ul{ padding-left: 20px; margin: 0 0 12px; color: var(--ink-soft); font-size:14.5px; }
.content ul li{ margin-bottom:6px; }

/* feature list on detail page */
.feature-list{ list-style:none; padding:0; margin:0; display:grid; gap:12px; }
.feature-list li{
  display:flex; align-items:flex-start; gap:10px;
  font-size: 14.5px; color: var(--ink-soft);
  background: var(--panel); border:1px solid var(--line); border-radius:10px; padding: 14px 16px;
}
.feature-list li .chk{
  width:18px; height:18px; border-radius:50%; background: var(--trust-bg); color:var(--trust);
  display:flex; align-items:center; justify-content:center; font-size:11px; flex-shrink:0; margin-top:2px;
}

/* screenshot placeholder / slot */
.shot-grid{ display:grid; grid-template-columns: repeat(3, 1fr); gap:14px; }
.shot-slot{ position:relative; aspect-ratio: 9/16; border-radius:16px; overflow:hidden; border:1px solid var(--line); }
.shot-ph{
  position:absolute; inset:0;
  background: repeating-linear-gradient(135deg, #EEF0F3, #EEF0F3 10px, #F6F7F9 10px, #F6F7F9 20px);
  display:flex; align-items:center; justify-content:center;
  color: #9AA3B5; font-size:12.5px; text-align:center; padding: 12px;
}
.shot-slot img{ position:absolute; inset:0; width:100%; height:100%; object-fit:cover; }

/* detail page top */
.detail-hero{ display:flex; align-items:center; gap:18px; margin-bottom: 6px; }
.detail-title h1{ font-size:30px; margin:0 0 6px; }
.detail-meta{ display:flex; align-items:center; gap:10px; }

/* ---------- Footer ---------- */
footer{ background: var(--bg-dark); color: var(--text-dim); padding: 50px 0 26px; }
.footer-grid{ display:grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 32px; margin-bottom: 34px; }
.footer-grid h4{ font-size:13px; color: #6B7488; margin: 0 0 14px; font-weight:600; }
.footer-grid a{ display:block; font-size: 13.5px; color: var(--text-dim); margin-bottom: 10px; }
.footer-grid a:hover{ color: var(--text-light); }
.footer-bottom{ display:flex; justify-content:space-between; align-items:center; font-size: 12.5px; color: #5A6278; padding-top: 22px; border-top: 1px solid rgba(255,255,255,0.08); }

@media (max-width: 940px){
  .hero-grid{ grid-template-columns: 1fr; }
  .phone-wrap{ margin-top: 10px; }
  .values-grid{ grid-template-columns: 1fr; }
  .grid{ grid-template-columns: repeat(2, 1fr); }
  .about-grid{ grid-template-columns: 1fr; }
  .footer-grid{ grid-template-columns: 1fr; }
  .shot-grid{ grid-template-columns: repeat(2,1fr); }
}
@media (max-width: 600px){
  h1{ font-size: 34px; }
  .page-hero h1{ font-size:28px; }
  .grid{ grid-template-columns: 1fr; }
  header nav a:not(.cta){ display:none; }
  .shot-grid{ grid-template-columns: 1fr 1fr; }
  .detail-hero{ flex-direction:column; align-items:flex-start; }
}