/* ScoreCompose-AI landing — minimal academic */

:root {
  --fg: #1a1a1a;
  --muted: #666;
  --accent: #1a5fb4;
  --accent-hover: #0c4490;
  --bg: #fdfdfc;
  --panel: #f6f5f1;
  --border: #e2e1dd;
  --maxw: 920px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, "SF Pro Text", "Helvetica Neue", "Segoe UI",
               "Noto Sans KR", system-ui, sans-serif;
  font-size: 17px;
  line-height: 1.65;
  color: var(--fg);
  background: var(--bg);
}

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

nav {
  display: flex; align-items: center; justify-content: space-between;
  max-width: var(--maxw); margin: 0 auto; padding: 18px 24px;
  border-bottom: 1px solid var(--border);
}
nav .logo { font-weight: 700; letter-spacing: -0.01em; }
nav ul { list-style: none; display: flex; gap: 22px; padding: 0; margin: 0; font-size: 15px; }
nav a { color: var(--fg); }
nav a:hover { color: var(--accent); text-decoration: none; }
nav a.ext { color: var(--muted); }

.hero {
  max-width: var(--maxw); margin: 0 auto;
  padding: 80px 24px 60px;
}
.hero h1 {
  font-size: clamp(28px, 4.6vw, 48px);
  line-height: 1.15; letter-spacing: -0.02em;
  margin: 0 0 22px;
}
.hero .lede {
  font-size: 19px; color: var(--muted); max-width: 640px;
  margin: 0 0 32px;
}
.hero .byline { color: var(--muted); font-size: 14px; margin-top: 32px; }

.cta { display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 9px 16px; border-radius: 6px;
  border: 1px solid var(--border); color: var(--fg); font-size: 15px;
  background: var(--bg);
}
.btn:hover { background: var(--panel); text-decoration: none; }
.btn.primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn.primary:hover { background: var(--accent-hover); }

main {
  max-width: var(--maxw); margin: 0 auto; padding: 0 24px;
}
section { padding: 56px 0; border-top: 1px solid var(--border); }
section:first-of-type { border-top: 0; }
h2 {
  font-size: 28px; letter-spacing: -0.01em; margin: 0 0 24px;
}
h3 { font-size: 17px; margin: 0 0 6px; }
p { margin: 0 0 14px; }
em { font-style: italic; color: #2a2a2a; }
strong { font-weight: 600; }

code, pre {
  font-family: "SF Mono", "Cascadia Mono", "JetBrains Mono", ui-monospace, monospace;
  font-size: 14px;
}
code { background: var(--panel); padding: 1px 5px; border-radius: 4px; }
pre {
  background: var(--panel); border: 1px solid var(--border);
  padding: 14px 16px; border-radius: 6px; overflow-x: auto;
  line-height: 1.45;
}
pre code { background: transparent; padding: 0; }

ol.steps { list-style: none; padding: 0; counter-reset: none; }
ol.steps li {
  padding: 14px 16px; margin-bottom: 10px;
  background: var(--panel); border: 1px solid var(--border); border-radius: 6px;
}
ol.steps h3 { color: var(--accent); }

figure.diagram {
  margin: 28px 0 0; padding: 0;
}
figure.diagram pre {
  font-size: 12px; line-height: 1.35; padding: 18px 16px;
}

table {
  border-collapse: collapse; width: 100%; margin: 12px 0;
  font-size: 15px;
}
th, td { padding: 8px 12px; border-bottom: 1px solid var(--border); text-align: left; }
th { background: var(--panel); font-weight: 600; }
td:first-child { font-weight: 500; }

.tiny { color: var(--muted); font-size: 13px; }

.cite {
  white-space: pre-wrap;
  background: var(--panel);
  border: 1px solid var(--border);
}

.demo-toolbar {
  display: flex; gap: 8px; flex-wrap: wrap; margin: 16px 0;
}
.demo-toolbar button {
  padding: 8px 14px; border: 1px solid var(--border); background: #fff;
  border-radius: 6px; cursor: pointer; font-size: 14px;
}
.demo-toolbar button:hover { background: var(--panel); }

#osmd-host {
  border: 1px solid var(--border); border-radius: 6px;
  padding: 12px; background: #fff; min-height: 240px;
}

footer {
  border-top: 1px solid var(--border); margin-top: 48px;
  padding: 28px 24px; text-align: center;
  color: var(--muted); font-size: 14px;
}

@media (max-width: 720px) {
  nav ul { display: none; }
  .hero { padding: 56px 22px 40px; }
}