:root {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #6b7280;
  --primary: #2563eb;
  --border: #e5e7eb;
  --card-bg: #f8fafc;
  --radius: 12px;
}

body.dark-mode {
  --bg: #121212;
  --fg: #eaeaea;
  --muted: #9ca3af;
  --border: #2a2a2a;
  --card-bg: #1c1c1c;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans Tamil", sans-serif;
  background: var(--bg);
  color: var(--fg);
  transition: background .2s, color .2s;
}

.container { max-width: 900px; margin: 0 auto; padding: 16px; }

.muted { color: var(--muted); }
.small { font-size: .85em; }

/* --- Nav --- */
.topnav {
  display: flex; justify-content: space-between; align-items: center;
  padding: 14px 16px; border-bottom: 1px solid var(--border);
  position: sticky; top: 0; background: var(--bg); z-index: 10;
}
.brand { font-weight: 700; color: var(--fg); text-decoration: none; font-size: 1.1rem; }
.nav-links a { margin-left: 14px; color: var(--muted); text-decoration: none; font-size: .9rem; }

/* --- Hero / Search --- */
.hero { padding: 24px 0 8px; }
.hero h1 { margin: 0 0 4px; font-size: 1.6rem; letter-spacing: .5px; }
.search-bar { display: flex; gap: 8px; margin-top: 14px; }
.search-bar input {
  flex: 1; padding: 12px 14px; border-radius: var(--radius);
  border: 1px solid var(--border); font-size: 1rem; background: var(--card-bg); color: var(--fg);
}

.btn { border: none; border-radius: 8px; padding: 10px 16px; font-size: .95rem; cursor: pointer; }
.btn-primary { background: var(--primary); color: #fff; }

/* --- Sections --- */
.section { margin: 28px 0; }
.section h2 { font-size: 1.05rem; margin-bottom: 12px; border-bottom: 1px solid var(--border); padding-bottom: 6px; }

.chip-row { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  padding: 8px 14px; border-radius: 999px; background: var(--card-bg);
  border: 1px solid var(--border); color: var(--fg); text-decoration: none; font-size: .9rem;
}

.card-row { display: flex; gap: 12px; overflow-x: auto; padding-bottom: 4px; }
.card-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
@media (min-width: 640px) { .card-grid { grid-template-columns: repeat(4, 1fr); } }

.doc-card, .continue-card {
  text-decoration: none; color: var(--fg); background: var(--card-bg);
  border-radius: var(--radius); overflow: hidden; border: 1px solid var(--border);
  display: block;
}
.continue-card { display: flex; min-width: 260px; align-items: center; gap: 10px; padding: 8px; }
.continue-info { flex: 1; }

.cover-thumb {
  background-color: #d1d5db; background-size: cover; background-position: center;
  aspect-ratio: 3/4; width: 100%;
}
.continue-card .cover-thumb { width: 56px; height: 74px; aspect-ratio: unset; border-radius: 8px; flex-shrink: 0; }
.doc-info { padding: 8px 10px; }
.doc-info strong { display: block; font-size: .9rem; }

.progress-bar { background: var(--border); border-radius: 6px; height: 6px; margin: 6px 0; overflow: hidden; }
.progress-fill { background: var(--primary); height: 100%; }

/* --- Auth --- */
.auth-page { display: flex; align-items: center; justify-content: center; min-height: 100vh; padding: 16px; }
.auth-card { max-width: 360px; width: 100%; }
.form label { display: block; margin-bottom: 14px; font-size: .9rem; }
.form input { width: 100%; padding: 10px; margin-top: 6px; border-radius: 8px; border: 1px solid var(--border); background: var(--card-bg); color: var(--fg); }
.alert { padding: 10px; border-radius: 8px; margin-bottom: 12px; font-size: .9rem; }
.alert-error { background: #fee2e2; color: #991b1b; }

/* --- Reader (page mode) --- */
.reader-body { margin: 0; height: 100vh; display: flex; flex-direction: column; overflow: hidden; }
.reader-topbar, .readmode-topbar {
  display: flex; align-items: center; gap: 10px; padding: 10px 12px;
  border-bottom: 1px solid var(--border); background: var(--bg); z-index: 5;
}
.back-link { text-decoration: none; color: var(--fg); font-size: 1.3rem; }
.reader-title { flex: 1; font-size: .95rem; font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.reader-actions { display: flex; gap: 6px; }
.icon-btn { background: none; border: none; font-size: 1.2rem; cursor: pointer; padding: 6px; text-decoration:none; color: var(--fg); }

.reader-canvas-wrap {
  flex: 1; overflow: auto; display: flex; align-items: flex-start; justify-content: center;
  background: #0000; position: relative; -webkit-user-select: none; user-select: none;
  touch-action: pan-y pinch-zoom;
}
.reader-page-image { max-width: 100%; height: auto; display: block; pointer-events: none; }
.page-loading {
  position: absolute; inset: 0; display: flex; align-items: center; justify-content: center;
  color: var(--muted); font-size: .9rem;
}

.reader-bottombar {
  display: flex; align-items: center; justify-content: center; gap: 16px;
  padding: 10px; border-top: 1px solid var(--border); background: var(--bg);
}
.nav-btn {
  background: var(--card-bg); border: 1px solid var(--border); color: var(--fg);
  border-radius: 8px; padding: 10px 18px; font-size: 1.1rem; cursor: pointer; text-decoration: none;
}
.page-indicator input {
  width: 48px; text-align: center; border: 1px solid var(--border); border-radius: 6px;
  padding: 4px; background: var(--card-bg); color: var(--fg);
}

/* --- Read Mode --- */
.readmode-body { min-height: 100vh; }
.readmode-speed-bar {
  display: flex; align-items: center; gap: 10px; padding: 8px 14px; font-size: .85rem;
  border-bottom: 1px solid var(--border); flex-wrap: wrap; color: var(--muted);
}
.readmode-speed-bar select { padding: 6px; border-radius: 6px; border: 1px solid var(--border); background: var(--card-bg); color: var(--fg); }

.readmode-content { max-width: 720px; margin: 0 auto; padding: 20px 18px 90px; }
.paragraph-block { margin-bottom: 22px; }
.para-text { font-size: 1.15rem; line-height: 1.8; margin: 0 0 8px; }
.para-toolbar { display: flex; gap: 10px; }
.para-toolbar button {
  background: var(--card-bg); border: 1px solid var(--border); color: var(--fg);
  border-radius: 999px; padding: 6px 14px; font-size: .85rem; cursor: pointer;
}
.para-toolbar button.playing { background: var(--primary); color: #fff; border-color: var(--primary); }

.readmode-bottombar {
  position: fixed; bottom: 0; left: 0; right: 0; display: flex; align-items: center;
  justify-content: space-between; padding: 10px 16px; background: var(--bg);
  border-top: 1px solid var(--border);
}

/* --- Admin --- */
.admin-wrap { max-width: 1000px; margin: 0 auto; padding: 20px 16px; }
table.admin-table { width: 100%; border-collapse: collapse; font-size: .9rem; }
table.admin-table th, table.admin-table td { padding: 8px 10px; border-bottom: 1px solid var(--border); text-align: left; }
.badge { padding: 2px 8px; border-radius: 999px; font-size: .75rem; background: var(--card-bg); border: 1px solid var(--border); }