/* ============================================================
   차근 (chageun.com)
   Design tokens mirror the app (lib/theme/app_colors.dart,
   design/certmate_ui*.html): warm cream bg + dot grid,
   deep indigo ink, lime accent w/ glow, Instrument Serif italic.
   ============================================================ */

:root {
  --bg: #F4F1EC;
  --bg-grid: rgba(14, 16, 32, 0.05);
  --ink: #0E1020;
  --ink-2: #2A2C40;
  --muted: #7A7A8C;
  --line: #E6E1D8;
  --surface: #FFFFFF;
  --surface-2: #FAF8F3;
  --surface-deep: #ECE7DE;
  --primary: #1E1E54;
  --primary-soft: #ECECF9;
  --accent: #D6F25B;        /* lime  */
  --accent-glow: rgba(214, 242, 91, 0.40);
  --accent-2: #FF6B4A;      /* coral */
  --accent-3: #7B61FF;      /* violet*/
  --success: #0DA37F;

  /* fixed-dark band colors (consistent in both themes, like the app hero) */
  --band: #0E1020;
  --band-2: #1E1E54;
  --band-ink: #F2EFE8;
  --band-muted: #9A9AB0;
  --band-line: rgba(255, 255, 255, 0.10);

  --radius: 22px;
  --radius-sm: 14px;
  --maxw: 1120px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #08080E;
    --bg-grid: rgba(255, 255, 255, 0.035);
    --ink: #F2EFE8;
    --ink-2: #C2C2CE;
    --muted: #6E6E80;
    --line: #1F1F2A;
    --surface: #131320;
    --surface-2: #1C1C2A;
    --surface-deep: #050509;
    --primary: #C0C5FF;
    --primary-soft: #1F1F38;
    --accent-2: #FF7B5A;
    --accent-3: #A693FF;
    --success: #14C39B;

    --band: #050509;
    --band-2: #1A1B3A;
  }
}

* { box-sizing: border-box; -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; }
html { scroll-behavior: smooth; }
html, body { margin: 0; padding: 0; }

body {
  font-family: 'Pretendard Variable', Pretendard, -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  background: var(--bg);
  background-image: radial-gradient(circle at 1px 1px, var(--bg-grid) 1px, transparent 0);
  background-size: 22px 22px;
  color: var(--ink);
  line-height: 1.5;
  letter-spacing: -0.02em;
  min-height: 100vh;
}

a { color: inherit; text-decoration: none; }
em { font-family: 'Instrument Serif', serif; font-style: italic; font-weight: 400; letter-spacing: -0.01em; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ───────── Nav ───────── */
.nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: saturate(140%) blur(12px);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 14px 24px;
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
}
.brand { display: flex; align-items: center; gap: 11px; }
.brand-mark {
  width: 36px; height: 36px; border-radius: 10px;
  background: var(--ink); color: var(--accent);
  display: grid; place-items: center;
  font-weight: 800; font-size: 18px; letter-spacing: -0.04em;
  box-shadow: 0 6px 18px rgba(14, 16, 32, 0.18);
}
@media (prefers-color-scheme: dark) {
  .brand-mark { background: var(--surface-2); }
}
.brand-name {
  font-family: 'Pretendard Variable', Pretendard, sans-serif; font-weight: 800;
  font-size: 21px; line-height: 1; letter-spacing: -0.045em;
}
.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a { font-size: 14px; font-weight: 600; color: var(--ink-2); transition: color 0.2s var(--ease); }
.nav-links a:hover { color: var(--ink); }
@media (max-width: 640px) { .nav-links { gap: 18px; } .nav-links .nav-hide { display: none; } }

/* ───────── Shared bits ───────── */
.pill {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 7px 14px; border-radius: 999px;
  background: var(--ink); color: var(--accent);
  font-size: 12px; font-weight: 700; letter-spacing: 0;
}
.pill .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 8px var(--accent); }
@media (prefers-color-scheme: dark) { .pill { background: var(--surface-2); } }

.eyebrow {
  font-family: 'Instrument Serif', serif; font-style: italic;
  font-size: 15px; letter-spacing: 0.08em; color: var(--muted);
}

/* ───────── Hero ───────── */
.hero { padding: 76px 0 88px; }
.hero-grid {
  display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 56px; align-items: center;
}
.hero-title {
  margin: 18px 0 0;
  font-size: clamp(34px, 5.2vw, 56px); font-weight: 800;
  letter-spacing: -0.04em; line-height: 1.08;
}
.hero-title em { font-family: 'Pretendard Variable', Pretendard, sans-serif; font-style: normal; font-weight: 800; color: var(--primary); }
.hero-sub {
  margin: 22px 0 0; max-width: 30em;
  font-size: 17px; color: var(--ink-2); font-weight: 500; line-height: 1.6;
}
.hero-cta { margin-top: 34px; display: flex; flex-wrap: wrap; gap: 12px; }

.badge {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 13px 20px; border-radius: 14px;
  background: var(--ink); color: var(--band-ink);
  font-weight: 700; font-size: 14px;
  box-shadow: 0 10px 24px -10px rgba(14, 16, 32, 0.45);
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease);
}
.badge:hover { transform: translateY(-2px); box-shadow: 0 16px 30px -12px rgba(14, 16, 32, 0.5); }
.badge .material-symbols-rounded { font-size: 22px; }
.badge-ic { height: 21px; width: auto; flex-shrink: 0; }
.badge small { display: block; font-size: 10px; font-weight: 600; color: var(--band-muted); letter-spacing: 0.04em; }
.badge b { display: block; font-size: 14px; line-height: 1.15; }
@media (prefers-color-scheme: dark) { .badge { background: var(--surface-2); border: 1px solid var(--line); } }

/* Hero visual — mock dashboard card cluster */
.hero-visual { position: relative; min-height: 360px; display: grid; place-items: center; }
.glow {
  position: absolute; width: 260px; height: 260px; border-radius: 50%;
  background: var(--accent); filter: blur(90px); opacity: 0.42; z-index: 0;
}
.card-dday {
  position: relative; z-index: 2; width: 290px;
  background: linear-gradient(155deg, var(--band) 0%, var(--band-2) 100%);
  border-radius: 26px; padding: 24px;
  box-shadow: 0 30px 60px -22px rgba(14, 16, 32, 0.5), inset 0 0 0 1px rgba(255,255,255,0.06);
  color: var(--band-ink);
}
.card-dday .row { display: flex; align-items: center; justify-content: space-between; }
.card-dday .label { font-size: 12px; font-weight: 700; color: var(--band-muted); letter-spacing: 0.02em; }
.card-dday .chip {
  font-size: 11px; font-weight: 700; padding: 5px 10px; border-radius: 999px;
  background: var(--accent); color: var(--ink);
}
.card-dday .dday {
  font-family: 'Instrument Serif', serif; font-style: italic;
  font-size: 64px; line-height: 1; margin: 16px 0 4px;
  color: var(--accent); text-shadow: 0 0 28px var(--accent-glow);
}
.card-dday .exam { font-size: 17px; font-weight: 700; }
.card-dday .date { font-size: 12px; color: var(--band-muted); margin-top: 3px; }
.card-dday .bar { height: 1px; background: var(--band-line); margin: 18px 0 14px; }
.card-dday .mini { display: flex; gap: 8px; }
.card-dday .mini span {
  font-size: 11px; font-weight: 600; padding: 5px 10px; border-radius: 8px;
  background: rgba(255,255,255,0.07); color: var(--band-ink);
}
.float {
  position: absolute; z-index: 3;
  background: var(--surface); border: 1px solid var(--line);
  border-radius: 14px; padding: 11px 14px;
  box-shadow: 0 16px 34px -16px rgba(14, 16, 32, 0.35);
  display: flex; align-items: center; gap: 9px;
  font-size: 13px; font-weight: 700;
}
.float .ic { display: grid; place-items: center; width: 26px; height: 26px; border-radius: 8px; }
.float .material-symbols-rounded { font-size: 18px; }
.float-1 { top: 26px; right: 0; }
.float-1 .ic { background: var(--primary-soft); color: var(--accent-3); }
.float-2 { bottom: 34px; left: 0; }
.float-2 .ic { background: color-mix(in srgb, var(--success) 16%, transparent); color: var(--success); }

@media (max-width: 880px) {
  .hero { padding: 48px 0 56px; }
  .hero-grid { grid-template-columns: 1fr; gap: 44px; }
  .hero-visual { min-height: 320px; order: 2; }
}

/* ───────── Section heads ───────── */
.section { padding: 60px 0; }
.section-head { max-width: 40em; margin-bottom: 40px; }
.section-head h2 {
  margin: 10px 0 0; font-size: clamp(26px, 3.6vw, 36px);
  font-weight: 800; letter-spacing: -0.035em; line-height: 1.2;
}
.section-head p { margin: 14px 0 0; color: var(--ink-2); font-size: 16px; font-weight: 500; }

/* ───────── Features ───────── */
.feature-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px;
}
@media (max-width: 900px) { .feature-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .feature-grid { grid-template-columns: 1fr; } }

.feature-card {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 26px 24px;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease), border-color 0.25s var(--ease);
}
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 22px 44px -24px rgba(14, 16, 32, 0.32);
  border-color: color-mix(in srgb, var(--accent) 55%, var(--line));
}
.feature-ic {
  width: 48px; height: 48px; border-radius: 13px;
  display: grid; place-items: center; margin-bottom: 18px;
  background: var(--ink); color: var(--accent);
}
@media (prefers-color-scheme: dark) { .feature-ic { background: var(--surface-2); } }
.feature-ic .material-symbols-rounded { font-size: 26px; }
.feature-card h3 { margin: 0 0 8px; font-size: 17px; font-weight: 800; letter-spacing: -0.02em; }
.feature-card p { margin: 0; color: var(--muted); font-size: 14px; font-weight: 500; line-height: 1.55; }

/* ───────── Outro + Footer (dark band) ───────── */
.outro {
  position: relative; overflow: hidden;
  background: linear-gradient(160deg, var(--band) 0%, var(--band-2) 120%);
  color: var(--band-ink);
}
.outro::before {
  content: ''; position: absolute; top: -120px; right: -80px;
  width: 360px; height: 360px; border-radius: 50%;
  background: var(--accent); filter: blur(120px); opacity: 0.28;
}
.outro-inner { position: relative; z-index: 1; padding: 84px 0 0; text-align: center; }
.outro h2 {
  margin: 0 auto; max-width: 16em;
  font-size: clamp(28px, 4.4vw, 44px); font-weight: 800;
  letter-spacing: -0.04em; line-height: 1.18;
}
.outro h2 em { font-family: 'Pretendard Variable', Pretendard, sans-serif; font-style: normal; font-weight: 800; color: var(--accent); text-shadow: 0 0 30px var(--accent-glow); }
.outro p { margin: 18px auto 0; max-width: 30em; color: var(--band-muted); font-size: 16px; font-weight: 500; }
.outro .hero-cta { justify-content: center; margin-top: 32px; }
.outro .badge { background: var(--surface); color: var(--ink); }
.outro .badge small { color: var(--muted); }

.footer {
  position: relative; z-index: 1;
  margin-top: 76px; padding: 40px 0 36px;
  border-top: 1px solid var(--band-line);
}
.footer-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 0 24px;
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 18px;
}
.footer .brand-name { color: var(--band-ink); }
.footer .brand-mark { background: var(--surface-2); }
.footer-links { display: flex; flex-wrap: wrap; gap: 22px; }
.footer-links a { font-size: 14px; font-weight: 600; color: var(--band-muted); transition: color 0.2s var(--ease); }
.footer-links a:hover { color: var(--accent); }
.footer-legal {
  max-width: var(--maxw); margin: 22px auto 0; padding: 18px 24px 0;
  border-top: 1px solid var(--band-line);
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 10px;
  color: var(--band-muted); font-size: 12.5px; font-weight: 500;
}

/* ───────── Legal document pages ───────── */
.doc { padding: 56px 0 72px; }
.doc-wrap { max-width: 780px; margin: 0 auto; padding: 0 24px; }
.doc-back {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 13px; font-weight: 700; color: var(--muted); margin-bottom: 26px;
}
.doc-back:hover { color: var(--ink); }
.doc-back .material-symbols-rounded { font-size: 18px; }
.doc h1 { font-size: clamp(28px, 4vw, 38px); font-weight: 800; letter-spacing: -0.04em; line-height: 1.2; margin: 0 0 10px; }
.doc .effective { font-size: 13px; font-weight: 700; color: var(--primary); margin: 0 0 6px; }
.doc .intro { color: var(--ink-2); font-size: 15px; line-height: 1.7; margin: 18px 0 0; }
.doc hr { border: 0; border-top: 1px solid var(--line); margin: 34px 0; }
.doc h2 { font-size: 20px; font-weight: 800; letter-spacing: -0.03em; margin: 38px 0 14px; }
.doc h3 { font-size: 16px; font-weight: 800; letter-spacing: -0.02em; margin: 26px 0 10px; }
.doc p { font-size: 15px; line-height: 1.72; color: var(--ink-2); margin: 12px 0; }
.doc ul, .doc ol { padding-left: 22px; margin: 12px 0; }
.doc li { font-size: 15px; line-height: 1.72; color: var(--ink-2); margin: 7px 0; }
.doc strong { color: var(--ink); font-weight: 700; }
.doc a { color: var(--accent-3); text-decoration: underline; text-underline-offset: 2px; word-break: break-all; }
.doc blockquote {
  margin: 16px 0; padding: 14px 18px;
  background: var(--surface-2); border-left: 3px solid var(--accent);
  border-radius: 0 12px 12px 0;
  font-size: 14px; line-height: 1.65; color: var(--ink-2);
}
.doc blockquote p { margin: 0; font-size: 14px; }
.doc table {
  width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 13.5px;
  border: 1px solid var(--line); border-radius: 12px; overflow: hidden;
}
.doc th, .doc td { padding: 11px 14px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--line); line-height: 1.6; }
.doc th { background: var(--surface-2); font-weight: 700; color: var(--ink); white-space: nowrap; }
.doc tr:last-child td { border-bottom: 0; }
.doc td { color: var(--ink-2); }
.doc-meta {
  margin-top: 40px; padding-top: 20px; border-top: 1px solid var(--line);
  color: var(--muted); font-size: 13px; line-height: 1.8;
}
@media (max-width: 560px) {
  .doc table, .doc thead, .doc tbody, .doc th, .doc td, .doc tr { display: block; }
  .doc th { white-space: normal; }
  .doc td { border-bottom: 0; }
  .doc tr { border-bottom: 1px solid var(--line); padding: 6px 0; }
  .doc tr:last-child { border-bottom: 0; }
}