:root {
  color-scheme: light;
  --bg: #f6f6f4;
  --sidebar: #efedeb;
  --panel: #fcfcfb;
  --panel-raised: #ffffff;
  --ink: #191b1d;
  --ink-soft: #50555a;
  --ink-faint: #878d93;
  --line: #e1e0dc;
  --accent: #2f6d5e;
  --accent-soft: rgb(47 109 94 / 0.1);
  --shadow-sm: 0 1px 2px rgb(24 26 28 / 0.05);
  --shadow-card: 0 1px 2px rgb(24 26 28 / 0.04), 0 14px 34px -20px rgb(24 26 28 / 0.3);
  --font-sans: Inter, "Noto Sans SC", "Noto Sans JP", ui-sans-serif, system-ui, sans-serif;
  --font-display: Fraunces, "Noto Serif SC", "Noto Serif JP", Georgia, serif;
}

html.dark {
  color-scheme: dark;
  --bg: #141517;
  --sidebar: #101114;
  --panel: #191b1e;
  --panel-raised: #202327;
  --ink: #e9e9e6;
  --ink-soft: #b6babd;
  --ink-faint: #7b8084;
  --line: #292c31;
  --accent: #6bc0a8;
  --accent-soft: rgb(107 192 168 / 0.14);
  --shadow-sm: 0 1px 2px rgb(0 0 0 / 0.4);
  --shadow-card: 0 1px 2px rgb(0 0 0 / 0.4), 0 16px 36px -22px rgb(0 0 0 / 0.7);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 14px/1.55 var(--font-sans);
}

button, select, input { font: inherit; color: inherit; }
button { cursor: pointer; }
a { color: inherit; }

.app { display: flex; min-height: 100%; }
.sidebar {
  width: 240px;
  flex-shrink: 0;
  background: var(--sidebar);
  border-right: 1px solid var(--line);
  padding: 16px 12px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  padding: 4px 6px 14px;
}
.brand img { width: 22px; height: 22px; border-radius: 6px; }
.brand strong {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.03em;
}
.nav-label {
  margin: 14px 6px 6px;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
}
.nav-btn {
  display: flex;
  width: 100%;
  border: 0;
  background: transparent;
  border-radius: 8px;
  padding: 7px 8px;
  text-align: left;
  color: var(--ink-soft);
}
.nav-btn[aria-current="true"], .nav-btn:hover { background: var(--panel); color: var(--ink); }

.main { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.banner {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  padding: 8px 16px;
  border-bottom: 1px solid var(--line);
  background: var(--panel);
  font-size: 12px;
  color: var(--ink-soft);
}
.banner a { color: var(--accent); text-decoration: none; }
.topbar {
  display: flex;
  gap: 8px;
  align-items: center;
  padding: 12px 16px;
}
.search {
  flex: 1;
  height: 34px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
  padding: 0 10px;
}
.sort, .lang, .theme {
  height: 34px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
  padding: 0 10px;
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 12px;
  padding: 4px 16px 32px;
}
.card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
  box-shadow: var(--shadow-sm);
  padding: 12px 16px 16px;
}
.card:hover { border-color: color-mix(in srgb, var(--accent) 35%, var(--line)); box-shadow: var(--shadow-card); }
.card-meta { font-size: 11px; letter-spacing: 0.06em; color: var(--ink-faint); }
.card h2 { margin: 8px 0 0; font-size: 15px; font-weight: 600; }
.card p { margin: 8px 0 0; min-height: 42px; color: var(--ink-soft); font-size: 13px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.card-foot { margin-top: 12px; font-size: 11px; color: var(--ink-faint); }
.empty { padding: 48px 16px; color: var(--ink-faint); }

.reader { display: none; flex: 1; min-height: 0; flex-direction: column; }
.reader.open { display: flex; }
.reader-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  height: 44px;
  padding: 0 12px;
  border-bottom: 1px solid var(--line);
  background: var(--panel);
}
.reader-bar button {
  border: 0;
  background: transparent;
  color: var(--accent);
}
.reader iframe { flex: 1; width: 100%; border: 0; background: var(--panel); }
.workspace.hidden { display: none; }

@media (max-width: 720px) {
  .sidebar { display: none; }
  .topbar { flex-wrap: wrap; }
}