*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* ===== Theme system: blue (default) / red / green / white =====
   Themes are applied as a class on <html> and persisted in localStorage.
   Colors are driven entirely by CSS variables so every component adapts. */
:root, html.blue {
  --bg-1: #061229;
  --bg-2: #0b2b4a;
  --surface: #0b2b4a;
  --card-bg: #12365c;
  --card-border: rgba(255, 255, 255, 0.06);
  --card-hover-border: rgba(47, 161, 255, 0.45);
  --accent: #2fa1ff;
  --accent-strong: #2563eb;
  --danger: #ff6b6b;
  --danger-strong: #dc2626;
  --fg: #d9eefc;
  --fg-muted: rgba(217, 238, 252, 0.6);
  --field-bg: rgba(255, 255, 255, 0.06);
  --border: rgba(255, 255, 255, 0.12);
  --radius: 10px;
}

html.red {
  --bg-1: #501212;
  --bg-2: #7d2a2a;
  --surface: #7d2a2a;
  --card-bg: #8f3232;
  --card-border: rgba(255, 255, 255, 0.06);
  --card-hover-border: rgba(255, 170, 170, 0.55);
  --accent: #ffaaaa;
  --accent-strong: #d94a4a;
  --danger: #ffd0d0;
  --danger-strong: #b91c1c;
  --fg: #ffffff;
  --fg-muted: rgba(255, 255, 255, 0.6);
  --field-bg: rgba(255, 255, 255, 0.08);
  --border: rgba(255, 255, 255, 0.14);
}

html.green {
  --bg-1: #0b3a14;
  --bg-2: #1e5f2e;
  --surface: #1e5f2e;
  --card-bg: #256b37;
  --card-border: rgba(255, 255, 255, 0.06);
  --card-hover-border: rgba(170, 255, 170, 0.55);
  --accent: #aaffaa;
  --accent-strong: #2f9e44;
  --danger: #ffd0d0;
  --danger-strong: #c92a2a;
  --fg: #ffffff;
  --fg-muted: rgba(255, 255, 255, 0.6);
  --field-bg: rgba(255, 255, 255, 0.08);
  --border: rgba(255, 255, 255, 0.14);
}

html.white {
  --bg-1: #eceff1;
  --bg-2: #f5f5f5;
  --surface: #ffffff;
  --card-bg: #ffffff;
  --card-border: rgba(0, 0, 0, 0.08);
  --card-hover-border: rgba(6, 69, 173, 0.35);
  --accent: #0645ad;
  --accent-strong: #0645ad;
  --danger: #dc2626;
  --danger-strong: #b91c1c;
  --fg: #1a1a1a;
  --fg-muted: rgba(0, 0, 0, 0.55);
  --field-bg: #ffffff;
  --border: #cccccc;
  --radius: 10px;
}

html, body {
  min-height: 100dvh;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 15px;
  color: var(--fg);
  background: linear-gradient(180deg, var(--bg-1) 0%, var(--bg-2) 100%);
  background-attachment: fixed;
  line-height: 1.5;
  transition: background .3s ease, color .3s ease;
}

/* ===== Nav ===== */
nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  background: rgba(255, 255, 255, 0.04);
  border-bottom: 1px solid var(--card-border);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
html.white nav { background: rgba(255, 255, 255, 0.85); }

.nav-brand { font-size: 18px; font-weight: 700; text-decoration: none; color: var(--fg); }
.nav-right { display: flex; align-items: center; gap: 12px; }

.theme-btn {
  background: var(--field-bg);
  color: var(--fg);
  padding: 7px 14px;
  border: 1px solid var(--card-hover-border);
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.theme-btn:hover { transform: translateY(-1px); background: rgba(255, 255, 255, 0.12); }
html.white .theme-btn:hover { background: rgba(0, 0, 0, 0.05); }

main { max-width: 860px; margin: 32px auto; padding: 0 16px; }

h1 { font-size: 22px; font-weight: 600; margin-bottom: 16px; color: var(--fg); }

/* ===== Buttons ===== */
.btn {
  display: inline-block;
  padding: 7px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--field-bg);
  color: var(--fg);
  text-decoration: none;
  font-size: 14px;
  cursor: pointer;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease, filter .2s ease;
}
.btn:hover { transform: translateY(-1px); box-shadow: 0 6px 16px rgba(0, 0, 0, 0.25); }
.btn-primary { background: var(--accent-strong); color: #fff; border-color: var(--accent-strong); }
.btn-primary:hover { filter: brightness(1.08); }
.btn-danger { background: var(--danger-strong); color: #fff; border-color: var(--danger-strong); }
.btn-danger:hover { filter: brightness(1.08); }
.btn-link { background: none; border: none; padding: 0; color: var(--danger); cursor: pointer; font-size: 14px; transform: none; }
.btn-link:hover { text-decoration: underline; transform: none; box-shadow: none; }

/* ===== List page ===== */
.page-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; flex-wrap: wrap; gap: 12px; }
.page-header h1 { margin-bottom: 0; }

.search-form { display: flex; gap: 8px; align-items: center; }
.search-form input {
  padding: 8px 12px; border: 1px solid var(--border); border-radius: 8px;
  font-size: 14px; width: 240px; background: var(--field-bg); color: var(--fg);
}
.search-form input::placeholder { color: var(--fg-muted); }
.search-form input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(47, 161, 255, 0.18); }
.search-form button {
  padding: 8px 14px; border-radius: 8px; border: 1px solid var(--card-hover-border);
  background: var(--field-bg); color: var(--fg); cursor: pointer; font-weight: 600;
}
.search-form button:hover { background: rgba(255, 255, 255, 0.12); }
html.white .search-form button:hover { background: rgba(0, 0, 0, 0.05); }
.search-form a { font-size: 13px; color: var(--fg-muted); }

table {
  width: 100%; border-collapse: collapse; background: var(--card-bg);
  border: 1px solid var(--card-border); border-radius: var(--radius); overflow: hidden;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
}
th { text-align: left; padding: 11px 14px; background: rgba(255, 255, 255, 0.05); font-size: 13px; color: var(--fg-muted); border-bottom: 1px solid var(--card-border); }
html.white th { background: #f0f0f0; }
td { padding: 11px 14px; border-bottom: 1px solid var(--card-border); }
tr:last-child td { border-bottom: none; }
tbody tr { transition: background .2s ease; }
tbody tr:hover { background: rgba(255, 255, 255, 0.05); }
html.white tbody tr:hover { background: #f7fbff; }
td a { color: var(--accent); text-decoration: none; }
td a:hover { text-decoration: underline; }
.actions { display: flex; gap: 10px; align-items: center; }
.inline-form { display: inline; }
.empty { color: var(--fg-muted); margin-top: 24px; }
.empty a { color: var(--accent); }

/* ===== Detail page ===== */
.detail {
  background: var(--card-bg); border: 1px solid var(--card-border); border-radius: var(--radius);
  padding: 28px; box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
}
.detail-header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 20px; gap: 16px; }
.detail-header h1 { margin-bottom: 0; }
dl { display: grid; grid-template-columns: 120px 1fr; gap: 10px 16px; margin-bottom: 24px; }
dt { font-weight: 600; color: var(--fg-muted); font-size: 13px; padding-top: 2px; }
dd { color: var(--fg); }
.notes { white-space: pre-wrap; }
.detail > a { color: var(--accent); text-decoration: none; }
.detail > a:hover { text-decoration: underline; }

/* ===== Form page ===== */
.form-page {
  background: var(--card-bg); border: 1px solid var(--card-border); border-radius: var(--radius);
  padding: 28px; max-width: 520px; box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
}
.form-page h1 { margin-bottom: 20px; }
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 13px; font-weight: 600; color: var(--fg-muted); margin-bottom: 5px; }
.field input, .field textarea {
  width: 100%; padding: 9px 11px; border: 1px solid var(--border); border-radius: 8px;
  font-size: 14px; font-family: inherit; background: var(--field-bg); color: var(--fg);
}
.field input::placeholder, .field textarea::placeholder { color: var(--fg-muted); }
.field input:focus, .field textarea:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(47, 161, 255, 0.18); }
.field.error input, .field.error textarea { border-color: var(--danger); }
.error-msg { display: block; color: var(--danger); font-size: 12px; margin-top: 4px; }
.optional { font-weight: 400; color: var(--fg-muted); }
.form-actions { display: flex; gap: 12px; align-items: center; margin-top: 20px; }
.form-actions a { color: var(--fg-muted); text-decoration: none; }
.form-actions a:hover { text-decoration: underline; }

/* ===== Book search page ===== */
.form-lead { color: var(--fg-muted); font-size: 14px; margin-bottom: 20px; }
.form-lead a { color: var(--accent); text-decoration: none; }
.form-lead a:hover { text-decoration: underline; }

.search-hint { color: var(--fg-muted); font-size: 14px; margin-bottom: 14px; }

.results-table td, .results-table th { vertical-align: middle; }
.results-table .col-select { width: 44px; text-align: center; }
.results-table input[type="checkbox"] {
  width: 17px; height: 17px; cursor: pointer; accent-color: var(--accent-strong);
}
.muted { color: var(--fg-muted); font-style: italic; font-size: 13px; }

/* ===== Sortable column headers ===== */
.sort-link {
  color: var(--fg-muted); text-decoration: none; font-weight: 600;
  display: inline-flex; align-items: center; gap: 4px; white-space: nowrap;
}
.sort-link:hover { color: var(--fg); }
.sort-link.active { color: var(--accent); }
