/* =============================================
   CSS RESET & CUSTOM PROPERTIES
   Primary: #1B2A6B (dark blue)
   Secondary: #FFFFFF (white)
   ============================================= */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary:       #1B2A6B;
  --primary-dark:  #111c4e;
  --primary-light: #2e3f8f;
  --accent:        #4a90d9;
  --success:       #16a34a;
  --danger:        #dc2626;
  --warning:       #d97706;

  --bg:            #f0f2f9;
  --bg-card:       #ffffff;
  --bg-section:    #e4e8f5;
  --bg-dark:       #1B2A6B;

  --text:          #0f1535;
  --text-muted:    #5a6490;
  --text-on-dark:  #ffffff;
  --border:        #c8cfe8;
  --white:         #ffffff;

  --font:          'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  --mono:          'Courier New', monospace;
  --radius:        12px;
  --radius-sm:     8px;
  --shadow:        0 4px 24px rgba(27, 42, 107, 0.12);
  --shadow-lg:     0 8px 40px rgba(27, 42, 107, 0.18);
  --transition:    0.25s ease;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* =============================================
   NAVIGATION
   ============================================= */
.nav {
  background: var(--primary);
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  position: sticky;
  top: 0;
  z-index: 200;
  box-shadow: 0 2px 16px rgba(27, 42, 107, 0.3);
}

.nav__logo {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--white);
  letter-spacing: 0.5px;
}

.nav__logo span { color: var(--accent); }

.nav__links {
  display: flex;
  gap: 0.25rem;
  list-style: none;
}

.nav__link {
  color: rgba(255,255,255,0.75);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.4rem 0.9rem;
  border-radius: 50px;
  transition: background var(--transition), color var(--transition);
}

.nav__link:hover {
  background: rgba(255,255,255,0.12);
  color: var(--white);
}

/* =============================================
   HERO BANNER
   ============================================= */
.hero {
  background: var(--primary);
  color: var(--white);
  padding: 4rem 2rem 3rem;
  text-align: center;
}

.hero__badge {
  display: inline-block;
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.25);
  color: rgba(255,255,255,0.9);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 0.3rem 1rem;
  border-radius: 50px;
  margin-bottom: 1.25rem;
  letter-spacing: 0.5px;
}

.hero__title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  margin-bottom: 0.75rem;
  line-height: 1.2;
}

.hero__title span { color: var(--accent); }

.hero__subtitle {
  color: rgba(255,255,255,0.7);
  font-size: 1.05rem;
  max-width: 560px;
  margin: 0 auto 2rem;
}

.hero__meta {
  display: flex;
  gap: 2rem;
  justify-content: center;
  flex-wrap: wrap;
}

.hero__meta-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.2rem;
}

.hero__meta-value {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--accent);
}

.hero__meta-label {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.6);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* =============================================
   PAGE WRAPPER
   ============================================= */
.page {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2.5rem 2rem;
  flex: 1;
  width: 100%;
}

/* =============================================
   SECTION TITLES
   ============================================= */
.section-title {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.section-title::after {
  content: '';
  flex: 1;
  height: 2px;
  background: var(--border);
  border-radius: 2px;
}

/* =============================================
   ENDPOINT CARDS
   ============================================= */
.endpoints {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 3rem;
}

.endpoint-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: box-shadow var(--transition);
}

.endpoint-card:hover { box-shadow: var(--shadow-lg); }

.endpoint-card__header {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.5rem;
  cursor: pointer;
  user-select: none;
  background: var(--bg-card);
  transition: background var(--transition);
}

.endpoint-card__header:hover { background: var(--bg-section); }

.method-badge {
  font-size: 0.75rem;
  font-weight: 800;
  padding: 0.25rem 0.7rem;
  border-radius: 6px;
  letter-spacing: 0.5px;
  min-width: 60px;
  text-align: center;
  flex-shrink: 0;
}

.method-badge--get    { background: #dbeafe; color: #1d4ed8; }
.method-badge--post   { background: #dcfce7; color: #15803d; }
.method-badge--put    { background: #fef9c3; color: #a16207; }
.method-badge--delete { background: #fee2e2; color: #b91c1c; }

.endpoint-card__path {
  font-family: var(--mono);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  flex: 1;
}

.endpoint-card__desc {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.endpoint-card__toggle {
  font-size: 0.8rem;
  color: var(--text-muted);
  transition: transform var(--transition);
}

.endpoint-card__toggle.open { transform: rotate(180deg); }

.endpoint-card__body {
  display: none;
  padding: 1.5rem;
  border-top: 1px solid var(--border);
  background: var(--bg-section);
}

.endpoint-card__body.open { display: block; }

/* =============================================
   FORMS
   ============================================= */
.api-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.api-form__row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.api-form__row--3 {
  grid-template-columns: 1fr 1fr 1fr;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.form-group label {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

.form-group input,
.form-group select,
.form-group textarea {
  padding: 0.65rem 1rem;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font);
  font-size: 0.93rem;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(27, 42, 107, 0.12);
}

.form-group input::placeholder,
.form-group textarea::placeholder { color: #aab0cc; }

.form-group textarea {
  resize: vertical;
  min-height: 80px;
  font-size: 0.9rem;
}

.form-actions {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  flex-wrap: wrap;
}

/* =============================================
   BUTTONS
   ============================================= */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 1.4rem;
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  border: 2px solid transparent;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
  text-decoration: none;
}

.btn--primary {
  background: var(--primary);
  color: var(--white);
  border-color: var(--primary);
}

.btn--primary:hover {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(27, 42, 107, 0.35);
}

.btn--danger {
  background: var(--danger);
  color: var(--white);
  border-color: var(--danger);
}

.btn--danger:hover {
  background: #b91c1c;
  transform: translateY(-1px);
}

.btn--outline {
  background: transparent;
  color: var(--primary);
  border-color: var(--primary);
}

.btn--outline:hover {
  background: var(--primary);
  color: var(--white);
  transform: translateY(-1px);
}

.btn--sm {
  padding: 0.35rem 0.9rem;
  font-size: 0.8rem;
}

/* =============================================
   RESPONSE PANEL
   ============================================= */
.response-panel {
  margin-top: 1.25rem;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--border);
  display: none;
}

.response-panel.visible { display: block; }

.response-panel__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 1rem;
  background: var(--primary);
  color: var(--white);
  font-size: 0.82rem;
  font-weight: 700;
}

.response-panel__status {
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  font-size: 0.78rem;
  font-weight: 800;
}

.status--ok    { background: #16a34a; color: #fff; }
.status--error { background: #dc2626; color: #fff; }

.response-panel__body {
  background: #0f1535;
  padding: 1rem 1.25rem;
  overflow-x: auto;
}

.response-panel__body pre {
  font-family: var(--mono);
  font-size: 0.83rem;
  color: #a8d8a8;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
}

/* =============================================
   BOOKS TABLE
   ============================================= */
.table-section { margin-bottom: 3rem; }

.table-wrapper {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.table-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
  gap: 0.75rem;
}

.table-toolbar__title {
  font-weight: 700;
  color: var(--primary);
  font-size: 1rem;
}

.table-toolbar__filters {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  align-items: center;
}

.table-toolbar__filters input,
.table-toolbar__filters select {
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: 50px;
  font-size: 0.85rem;
  background: var(--bg-section);
  color: var(--text);
  font-family: var(--font);
}

.table-toolbar__filters input:focus,
.table-toolbar__filters select:focus {
  outline: none;
  border-color: var(--primary);
}

table { width: 100%; border-collapse: collapse; }

thead { background: var(--primary); color: var(--white); }

thead th {
  padding: 0.85rem 1.25rem;
  text-align: left;
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

tbody tr {
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}

tbody tr:last-child { border-bottom: none; }
tbody tr:hover { background: var(--bg-section); }

tbody td {
  padding: 0.85rem 1.25rem;
  font-size: 0.92rem;
  color: var(--text);
}

.badge {
  display: inline-block;
  padding: 0.2rem 0.65rem;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 700;
}

.badge--in  { background: #dcfce7; color: #15803d; }
.badge--out { background: #fee2e2; color: #b91c1c; }
.badge--genre { background: var(--bg-section); color: var(--primary); border: 1px solid var(--border); }

.table-empty {
  text-align: center;
  padding: 3rem;
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* =============================================
   HEALTH CARD
   ============================================= */
.health-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  box-shadow: var(--shadow);
  margin-bottom: 3rem;
}

.health-card__dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #9ca3af;
  flex-shrink: 0;
  transition: background var(--transition);
}

.health-card__dot.online  { background: var(--success); box-shadow: 0 0 8px rgba(22,163,74,0.5); }
.health-card__dot.offline { background: var(--danger); }

.health-card__text { flex: 1; }
.health-card__label { font-weight: 700; color: var(--text); font-size: 0.95rem; }
.health-card__msg   { font-size: 0.85rem; color: var(--text-muted); }

/* =============================================
   TOAST
   ============================================= */
.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: var(--primary);
  color: var(--white);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 600;
  box-shadow: var(--shadow-lg);
  z-index: 999;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.3s ease, transform 0.3s ease;
  pointer-events: none;
  max-width: 320px;
}

.toast.show    { opacity: 1; transform: translateY(0); }
.toast.success { background: var(--success); }
.toast.error   { background: var(--danger); }

/* =============================================
   FOOTER
   ============================================= */
.footer {
  background: var(--primary);
  color: rgba(255,255,255,0.7);
  padding: 1.5rem 2rem;
  margin-top: auto;
}

.footer__inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.footer__logo { font-size: 1rem; font-weight: 700; color: var(--white); letter-spacing: 0.5px; }
.footer__copy { font-size: 0.85rem; }

/* =============================================
   RESPONSIVE
   ============================================= */
@media (max-width: 768px) {
  .nav { padding: 0 1rem; }
  .hero { padding: 2.5rem 1rem 2rem; }
  .page { padding: 1.5rem 1rem; }
  .api-form__row,
  .api-form__row--3 { grid-template-columns: 1fr; }
  .table-toolbar { flex-direction: column; align-items: flex-start; }
  thead th:nth-child(5),
  tbody td:nth-child(5) { display: none; }
}

@media (max-width: 480px) {
  .hero__meta { gap: 1.25rem; }
  .nav__links { display: none; }
  .endpoint-card__desc { display: none; }
  thead th:nth-child(4),
  tbody td:nth-child(4) { display: none; }
}