:root {
  --bg: #fafafa;
  --surface: #ffffff;
  --border: #e5e7eb;
  --border-subtle: #f3f4f6;
  --text: #111827;
  --text-muted: #4b5563;
  --text-dim: #9ca3af;

  --term-bg: #0d1117;
  --term-card: #161b22;
  --term-border: #30363d;
  --term-green: #3fb950;
  --term-text: #e6edf3;
  --term-dim: #8b949e;
}

* { box-sizing: border-box; margin: 0; padding: 0; -webkit-tap-highlight-color: transparent; }

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: 'Pretendard Variable', Pretendard, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.8;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}
body.dark { background-color: var(--term-bg); color: var(--term-text); }

.container {
  max-width: 600px;
  margin: 0 auto;
  width: 100%;
  padding: 28px 24px 48px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Header + hamburger (sub pages) */
header {
  margin-bottom: 24px;
  display: flex;
  justify-content: flex-end;
  align-items: center;
}
.menu-wrap { position: relative; }
.menu-btn {
  width: 36px;
  height: 36px;
  background: transparent;
  border: none;
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  cursor: pointer;
}
.menu-btn span {
  display: block;
  width: 18px;
  height: 1.5px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.2s, opacity 0.2s;
}
body.dark .menu-btn span { background: #fff; }
.menu-btn.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.menu-btn.open span:nth-child(2) { opacity: 0; }
.menu-btn.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

.menu-panel {
  display: none;
  position: absolute;
  right: 0;
  top: 44px;
  min-width: 150px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
  padding: 6px;
  z-index: 50;
}
.menu-panel.open { display: block; animation: fadeIn 0.15s ease-out; }
body.dark .menu-panel {
  background: var(--term-card);
  border-color: var(--term-border);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
}
.menu-item {
  display: block;
  width: 100%;
  text-align: left;
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-muted);
  padding: 10px 12px;
  border-radius: 8px;
}
.menu-item:hover { background: var(--border-subtle); color: var(--text); }
.menu-item.active { color: var(--text); font-weight: 600; }
body.dark .menu-item { color: var(--term-dim); }
body.dark .menu-item:hover { background: #21262d; color: #fff; }
body.dark .menu-item.active { color: #fff; }

/* Footer */
footer { margin-top: 56px; }
.footer-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 6px;
}
.footer-text { font-size: 0.95rem; color: var(--text-muted); line-height: 1.7; }
.footer-link {
  color: var(--text);
  text-decoration: underline;
  text-decoration-color: var(--border);
  text-underline-offset: 3px;
  transition: text-decoration-color 0.2s;
}
.footer-link:hover { text-decoration-color: var(--text); }
body.dark .footer-text { color: var(--term-dim); }
body.dark .footer-link { color: #fff; text-decoration-color: var(--term-border); }
body.dark .footer-link:hover { text-decoration-color: #fff; }