* { box-sizing: border-box; }

:root {
  color-scheme: light;
  --bg: #f4f1ea;
  --ink: #4a3f2f;
  --ink-muted: #6b5c45;
  --ink-soft: #8a7550;
  --ink-faint: #9a8c70;
  --text-strong: #3a3530;
  --accent: #c9a86a;
  --accent-strong: #a9834a;
  --accent-bg: #d9b374;
  --accent-bg-hover: #cfa563;
  --border: #ddca9e;
  --border-soft: #e5d3a4;
  --panel-bg: rgba(255, 253, 246, 0.55);
  --card-bg: #fffdf6;
  --clock-face-fill: #fffdf8;
  --clock-face-stroke: #ddd0b4;
  --tick-major: #6b5c45;
  --tick-minor: #b8a982;
  --shadow-soft: rgba(120, 95, 50, 0.08);
  --shadow-btn: rgba(150, 115, 60, 0.2);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #1b1712;
    --ink: #f0e9da;
    --ink-muted: #d8c9a8;
    --ink-soft: #b8a888;
    --ink-faint: #8a7d64;
    --text-strong: #f0e9da;
    --accent: #d9b46a;
    --accent-strong: #d9b46a;
    --accent-bg: #b8863f;
    --accent-bg-hover: #a8763a;
    --border: #4a4030;
    --border-soft: #453b2c;
    --panel-bg: rgba(40, 35, 26, 0.55);
    --card-bg: #241f18;
    --clock-face-fill: #241f18;
    --clock-face-stroke: #4a4030;
    --tick-major: #d8c9a8;
    --tick-minor: #6b5f48;
    --shadow-soft: rgba(0, 0, 0, 0.3);
    --shadow-btn: rgba(0, 0, 0, 0.35);
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #1b1712;
  --ink: #f0e9da;
  --ink-muted: #d8c9a8;
  --ink-soft: #b8a888;
  --ink-faint: #8a7d64;
  --text-strong: #f0e9da;
  --accent: #d9b46a;
  --accent-strong: #d9b46a;
  --accent-bg: #b8863f;
  --accent-bg-hover: #a8763a;
  --border: #4a4030;
  --border-soft: #453b2c;
  --panel-bg: rgba(40, 35, 26, 0.55);
  --card-bg: #241f18;
  --clock-face-fill: #241f18;
  --clock-face-stroke: #4a4030;
  --tick-major: #d8c9a8;
  --tick-minor: #6b5f48;
  --shadow-soft: rgba(0, 0, 0, 0.3);
  --shadow-btn: rgba(0, 0, 0, 0.35);
}

html, body {
  margin: 0;
  padding: 0;
  font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background-color: var(--bg);
  color: var(--ink);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
  padding: 10px 16px;
  background: var(--card-bg);
  border-bottom: 2px solid var(--border);
}

.site-nav a {
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  color: var(--ink-muted);
}

.site-nav a:hover {
  background: var(--panel-bg);
}

.site-nav a.active {
  background: var(--accent-bg);
  color: var(--ink);
}

.page {
  max-width: 880px;
  margin: 0 auto;
  padding: 32px 20px 64px;
}

.page h1 {
  font-size: 30px;
  margin: 8px 0 4px;
  color: var(--ink);
}

.page h2 {
  font-size: 21px;
  margin: 36px 0 12px;
  color: var(--ink-muted);
  border-bottom: 2px solid var(--border);
  padding-bottom: 8px;
}

.page h3 {
  font-size: 16px;
  margin: 20px 0 8px;
  color: var(--ink-muted);
}

.page p {
  line-height: 1.7;
  color: var(--text-strong);
}

.tagline {
  font-size: 16px;
  color: var(--ink-soft);
  margin-bottom: 24px;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border-soft);
  border-radius: 14px;
  padding: 20px 22px;
  margin-bottom: 18px;
  box-shadow: 0 2px 8px var(--shadow-soft);
}

.btn {
  display: inline-block;
  padding: 11px 20px;
  border: 1px solid var(--accent-strong);
  border-radius: 10px;
  background: var(--accent-bg);
  color: var(--ink);
  font-weight: 700;
  font-size: 15px;
  text-decoration: none;
  box-shadow: 0 2px 6px var(--shadow-btn);
}

.btn:hover {
  background: var(--accent-bg-hover);
}

.btn.secondary {
  background: transparent;
  color: var(--ink-muted);
}

.btn.secondary:hover {
  background: var(--panel-bg);
}

.btn-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin: 20px 0;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  margin: 20px 0;
}

.feature-grid .card {
  margin-bottom: 0;
}

.feature-grid .icon {
  font-size: 26px;
  margin-bottom: 6px;
}

.feature-grid h3 {
  margin: 4px 0 6px;
}

.feature-grid p {
  font-size: 14px;
  margin: 0;
  color: var(--ink-soft);
}

.steps {
  padding-left: 0;
  list-style: none;
  counter-reset: step;
}

.steps > li {
  counter-increment: step;
  position: relative;
  padding: 4px 0 4px 42px;
  margin-bottom: 14px;
  line-height: 1.7;
}

.steps > li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 4px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--accent-bg);
  color: var(--ink);
  font-weight: 700;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
}

kbd, .key {
  display: inline-block;
  padding: 2px 7px;
  border: 1px solid var(--border-input, var(--border));
  border-radius: 6px;
  background: var(--panel-bg);
  font-size: 13px;
  font-family: inherit;
  color: var(--ink-muted);
}

.tip {
  background: var(--panel-bg);
  border-left: 3px solid var(--accent);
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 14px;
  color: var(--ink-muted);
  margin: 14px 0;
}

.persona-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
  margin: 20px 0;
}

.persona-card {
  background: var(--card-bg);
  border: 1px solid var(--border-soft);
  border-radius: 14px;
  padding: 18px;
  box-shadow: 0 2px 8px var(--shadow-soft);
}

.persona-card svg {
  width: 100%;
  max-width: 220px;
  height: auto;
  display: block;
  margin: 8px auto 12px;
}

.persona-card .legend {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 13px;
}

.persona-card .legend li {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 4px;
}

.persona-card .dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  flex-shrink: 0;
}

.footer-nav {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 2px solid var(--border);
}

.demo-face {
  fill: var(--clock-face-fill);
  stroke: var(--clock-face-stroke);
  stroke-width: 2;
}

.demo-tick {
  stroke: var(--tick-minor);
  stroke-width: 1.5;
}

.demo-tick-label {
  font-size: 9px;
  font-weight: 700;
  fill: var(--tick-major);
  text-anchor: middle;
  dominant-baseline: middle;
}

.hero-demo {
  display: flex;
  justify-content: center;
  margin: 12px 0 28px;
}

.hero-demo svg {
  width: 100%;
  max-width: 260px;
  height: auto;
}