/* Signal Light 사이트. 색은 신호등 세 가지 + 차분한 회색 계열. */
:root {
  --red: #ea4335;
  --yellow: #fbbc05;
  --green: #34a853;
  --ink: #1f242a;
  --text: #2b3138;
  --dim: #66707b;
  --faint: #8a939d;
  --line: #e4e8ec;
  --bg: #ffffff;
  --bg-soft: #f5f7f9;
  --card: #ffffff;
  --accent: #2563eb;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.04), 0 8px 24px rgba(16, 24, 40, 0.06);
  --radius: 18px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #f3f5f7;
    --text: #dfe4e9;
    --dim: #a3adb8;
    --faint: #7f8a96;
    --line: #2a3139;
    --bg: #0f1317;
    --bg-soft: #151a1f;
    --card: #181e24;
    --accent: #7aa7ff;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.25);
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 80px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Noto Sans KR", system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  /* 한국어는 낱말 중간에서 줄을 바꾸지 않는다 */
  word-break: keep-all;
  overflow-wrap: anywhere;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; }

.wrap { width: min(1040px, 100% - 32px); margin-inline: auto; }
.narrow { width: min(760px, 100% - 32px); margin-inline: auto; }

/* ── 머리글 ── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(160%) blur(12px);
  -webkit-backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap {
  display: flex;
  align-items: center;
  gap: 16px;
  height: 64px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 900;
  font-size: 17px;
  letter-spacing: 0.12em;
  white-space: nowrap;
}
.brand:hover { text-decoration: none; }
.brand img { height: 22px; width: auto; display: block; }
.nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav a {
  color: var(--dim);
  font-size: 14px;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: 99px;
  white-space: nowrap;
}
.nav a:hover { color: var(--ink); background: var(--bg-soft); text-decoration: none; }
.nav .lang { border: 1px solid var(--line); }

/* ── 첫 화면 ── */
.hero {
  text-align: center;
  padding: 72px 0 64px;
  background:
    radial-gradient(600px 220px at 20% 0%, color-mix(in srgb, var(--red) 10%, transparent), transparent 70%),
    radial-gradient(600px 220px at 50% 0%, color-mix(in srgb, var(--yellow) 12%, transparent), transparent 70%),
    radial-gradient(600px 220px at 80% 0%, color-mix(in srgb, var(--green) 10%, transparent), transparent 70%);
  border-bottom: 1px solid var(--line);
}
.hero .logo { width: min(300px, 70vw); height: auto; display: block; margin: 0 auto 28px; }
.hero h1 {
  margin: 0 0 12px;
  color: var(--ink);
  font-size: clamp(26px, 4.4vw, 40px);
  font-weight: 900;
  line-height: 1.3;
  letter-spacing: -0.01em;
}
.hero p { margin: 0 auto; max-width: 560px; color: var(--dim); font-size: 17px; }

/* ── 구역 ── */
.section { padding: 64px 0; }
.section + .section { border-top: 1px solid var(--line); }
.section-head { margin-bottom: 28px; }
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--faint);
}
.dots { display: inline-flex; gap: 4px; }
.dots i { width: 8px; height: 8px; border-radius: 50%; display: block; }
.dots i:nth-child(1) { background: var(--red); }
.dots i:nth-child(2) { background: var(--yellow); }
.dots i:nth-child(3) { background: var(--green); }
.section h2 { margin: 6px 0 0; color: var(--ink); font-size: 28px; font-weight: 900; }

/* ── 앱 카드 ── */
.apps {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 440px), 1fr));
  gap: 20px;
}
.app {
  display: flex;
  gap: 20px;
  padding: 24px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.app-icon {
  width: 88px;
  height: 88px;
  flex: none;
  border-radius: 22px;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.12);
}
.app-icon.emoji {
  display: grid;
  place-items: center;
  font-size: 44px;
  background: linear-gradient(135deg, #ffd54f, #ff8a65);
}
.app-body { min-width: 0; }
.app h3 { margin: 0; color: var(--ink); font-size: 19px; font-weight: 700; line-height: 1.35; }
.tags { display: flex; flex-wrap: wrap; gap: 6px; margin: 8px 0 10px; }
.tag {
  font-size: 12px;
  font-weight: 700;
  padding: 2px 10px;
  border-radius: 99px;
  background: var(--bg-soft);
  color: var(--dim);
  border: 1px solid var(--line);
}
.tag.soon { color: #9a6a00; background: color-mix(in srgb, var(--yellow) 18%, transparent); border-color: transparent; }
.tag.live { color: #1e7b3c; background: color-mix(in srgb, var(--green) 16%, transparent); border-color: transparent; }
@media (prefers-color-scheme: dark) {
  .tag.soon { color: #ffd666; }
  .tag.live { color: #7ee2a0; }
}
.app p { margin: 0 0 16px; color: var(--dim); font-size: 15px; }
.actions { display: flex; flex-wrap: wrap; gap: 8px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 700;
  padding: 8px 16px;
  border-radius: 99px;
  border: 1px solid var(--line);
  color: var(--ink);
  background: var(--card);
}
.btn:hover { text-decoration: none; background: var(--bg-soft); }
.btn.primary { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.btn.primary:hover { opacity: 0.88; }
.btn[aria-disabled="true"] { opacity: 0.5; pointer-events: none; }

/* ── 문의 ── */
.contact {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  padding: 28px;
  border-radius: var(--radius);
  background: var(--bg-soft);
  border: 1px solid var(--line);
}
.contact strong { display: block; color: var(--ink); font-size: 18px; }
.contact span { color: var(--dim); font-size: 15px; }

/* ── 바닥글 ── */
.site-footer {
  border-top: 1px solid var(--line);
  background: var(--bg-soft);
  padding: 32px 0 40px;
  font-size: 14px;
  color: var(--faint);
}
.site-footer .wrap { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 24px; }
.site-footer .links { display: flex; gap: 16px; margin-left: auto; }
.site-footer a { color: var(--dim); }

/* ── 문서 (개인정보처리방침) ── */
.doc-head { padding: 48px 0 8px; }
.crumb { font-size: 14px; color: var(--faint); margin-bottom: 18px; }
.crumb a { color: var(--dim); }
.doc-app { display: flex; align-items: center; gap: 16px; }
.doc-app .app-icon { width: 64px; height: 64px; border-radius: 16px; }
.doc-app .app-icon.emoji { font-size: 32px; }
.doc-switch { display: flex; gap: 8px; margin-top: 20px; }

.doc { padding: 16px 0 72px; }
.doc h1 {
  margin: 36px 0 4px;
  color: var(--ink);
  font-size: clamp(24px, 3.6vw, 32px);
  font-weight: 900;
  line-height: 1.3;
}
.doc .meta { margin: 0 0 20px; color: var(--faint); font-size: 14px; }
.policy {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 12px clamp(20px, 4vw, 40px) 28px;
}
.policy > p:first-child { color: var(--dim); }
.policy h3 {
  margin: 28px 0 8px;
  padding-left: 12px;
  border-left: 4px solid var(--green);
  color: var(--ink);
  font-size: 17px;
  line-height: 1.4;
}
.policy p { margin: 0 0 10px; }
.policy ul { margin: 0 0 10px; padding-left: 20px; }
.policy li { margin: 4px 0; }

.policy-list { display: grid; gap: 16px; }
.policy-list .app { align-items: center; }
.policy-list .app p { margin: 4px 0 0; }

@media (max-width: 560px) {
  .site-header .wrap { gap: 8px; }
  .brand { font-size: 14px; }
  .brand img { height: 18px; }
  .nav a { padding: 6px 8px; font-size: 13px; }
  .nav .hide-sm { display: none; }
  .app { flex-direction: column; gap: 14px; padding: 20px; }
  .hero { padding: 56px 0 48px; }
  .section { padding: 48px 0; }
}