/* ─── CSS Variables ─────────────────────────────────────────────────────────── */
:root {
  --cream:       #f5f0e8;
  --cream-dark:  #ede5d4;
  --brown:       #3b2a1a;
  --brown-mid:   #6b4c30;
  --terracotta:  #c96a3c;
  --teal:        #4a8b8c;
  --teal-light:  #e8f4f4;
  --amber:       #d4a847;
  --amber-light: #fdf3d8;
  --rose:        #c97070;
  --green-soft:  #7aab7a;
  --white:       #ffffff;
  --shadow-sm:   0 2px 8px rgba(59,42,26,0.08);
  --shadow-md:   0 6px 24px rgba(59,42,26,0.12);
  --shadow-lg:   0 16px 48px rgba(59,42,26,0.16);
  --radius:      14px;
  --radius-sm:   8px;
  --font-serif:  'Playfair Display', Georgia, serif;
  --font-sans:   'DM Sans', system-ui, sans-serif;
  --transition:  0.22s ease;
}

/* ─── Reset & Base ──────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--cream);
  color: var(--brown);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ─── Header / Nav ──────────────────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(245,240,232,0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--cream-dark);
  padding: 0 clamp(1rem, 4vw, 2.5rem);
}

.nav {
  max-width: 1100px;
  margin: 0 auto;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--brown);
  text-decoration: none;
  letter-spacing: -0.02em;
}

/* ─── Buttons ───────────────────────────────────────────────────────────────── */
.btn-add-nav,
.btn-primary {
  background: var(--brown);
  color: var(--cream);
  border: none;
  padding: 0.55rem 1.25rem;
  border-radius: 50px;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
}
.btn-add-nav:hover,
.btn-primary:hover {
  background: var(--brown-mid);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}
.btn-add-nav:active, .btn-primary:active { transform: translateY(0); }

.btn-secondary {
  background: transparent;
  color: var(--brown-mid);
  border: 1.5px solid var(--cream-dark);
  padding: 0.55rem 1.25rem;
  border-radius: 50px;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition);
}
.btn-secondary:hover { border-color: var(--brown-mid); background: var(--cream-dark); }

.btn-danger {
  background: #c0392b;
  color: var(--white);
  border: none;
  padding: 0.55rem 1.25rem;
  border-radius: 50px;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition);
}
.btn-danger:hover { background: #a93226; transform: translateY(-1px); }

/* ─── Hero ──────────────────────────────────────────────────────────────────── */
.hero {
  background: var(--cream-dark);
  padding: 3.5rem clamp(1rem, 4vw, 2.5rem) 0;
  overflow: hidden;
  position: relative;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(201,106,60,0.07) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 30%, rgba(74,139,140,0.06) 0%, transparent 60%);
  pointer-events: none;
}

.hero-text {
  max-width: 1100px;
  margin: 0 auto;
  text-align: center;
  padding-bottom: 2.5rem;
  position: relative;
  z-index: 1;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 700;
  color: var(--brown);
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 0.75rem;
}

.hero-sub {
  font-size: 1.05rem;
  color: var(--brown-mid);
  max-width: 420px;
  margin: 0 auto;
}

/* Decorative book spines shelf */
.hero-shelf {
  max-width: 600px;
  margin: 2rem auto 0;
  height: 80px;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 5px;
  position: relative;
}

.hero-shelf::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: -10%;
  right: -10%;
  height: 6px;
  background: var(--brown-mid);
  border-radius: 3px;
}

.shelf-spine {
  display: block;
  border-radius: 3px 3px 0 0;
  flex-shrink: 0;
}
.sp-1 { width: 18px; height: 62px; background: var(--terracotta); }
.sp-2 { width: 28px; height: 72px; background: var(--teal); }
.sp-3 { width: 22px; height: 55px; background: var(--amber); }
.sp-4 { width: 16px; height: 68px; background: #8B6F5C; }
.sp-5 { width: 30px; height: 75px; background: var(--terracotta); opacity: .8; }
.sp-6 { width: 20px; height: 58px; background: var(--teal); opacity: .7; }
.sp-7 { width: 24px; height: 64px; background: var(--green-soft); }
.sp-8 { width: 18px; height: 50px; background: var(--amber); opacity: .85; }

/* ─── Main Content ──────────────────────────────────────────────────────────── */
.main-content {
  flex: 1;
  max-width: 1100px;
  width: 100%;
  margin: 0 auto;
  padding: 2.5rem clamp(1rem, 4vw, 2rem);
}

/* Stats bar */
.stats-bar {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
  color: var(--brown-mid);
}
#bookCount { font-weight: 600; color: var(--brown); }
.stats-divider { width: 1px; height: 14px; background: var(--cream-dark); }

/* Search */
.search-wrap {
  position: relative;
  margin-bottom: 2rem;
  max-width: 420px;
}
.search-input {
  width: 100%;
  padding: 0.75rem 1rem 0.75rem 2.8rem;
  border: 1.5px solid var(--cream-dark);
  border-radius: 50px;
  background: var(--white);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: var(--brown);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}
.search-input::placeholder { color: #b0a090; }
.search-input:focus { border-color: var(--teal); box-shadow: 0 0 0 3px rgba(74,139,140,0.12); }
.search-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.95rem;
  pointer-events: none;
}

/* ─── Cards Grid ────────────────────────────────────────────────────────────── */
.books-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

/* ─── Book Card ─────────────────────────────────────────────────────────────── */
.book-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 1.6rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(59,42,26,0.06);
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  transition: transform var(--transition), box-shadow var(--transition);
  position: relative;
  overflow: hidden;
  animation: cardIn 0.4s ease both;
}

@keyframes cardIn {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

.book-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 4px;
  height: 100%;
  background: var(--card-accent, var(--teal));
  border-radius: var(--radius) 0 0 var(--radius);
}

.book-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

/* Accent color variants */
.book-card.accent-1 { --card-accent: var(--terracotta); }
.book-card.accent-2 { --card-accent: var(--teal); }
.book-card.accent-3 { --card-accent: var(--amber); }
.book-card.accent-4 { --card-accent: var(--green-soft); }
.book-card.accent-5 { --card-accent: var(--rose); }

.card-header { display: flex; justify-content: space-between; align-items: flex-start; gap: 0.5rem; }

.book-title {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--brown);
  line-height: 1.3;
  flex: 1;
}

.book-author {
  font-size: 0.825rem;
  color: var(--brown-mid);
  font-weight: 500;
}
.book-author::before { content: 'by '; opacity: 0.6; }

.book-summary {
  font-size: 0.88rem;
  color: #5a4535;
  line-height: 1.7;
  flex: 1;
  /* Clamp to ~4 lines */
  display: -webkit-box;
  -webkit-line-clamp: 5;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.book-summary.expanded { -webkit-line-clamp: unset; }

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 0.4rem;
  padding-top: 0.8rem;
  border-top: 1px solid var(--cream-dark);
}

.book-date {
  font-size: 0.77rem;
  color: #a09080;
}

.card-actions { display: flex; gap: 0.5rem; }

.btn-read-more {
  background: none;
  border: none;
  color: var(--teal);
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 500;
  cursor: pointer;
  padding: 0.2rem 0;
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color var(--transition);
}
.btn-read-more:hover { color: var(--brown); }

.btn-delete-card {
  background: none;
  border: 1.5px solid #e8d8d0;
  color: #c0392b;
  border-radius: 50%;
  width: 30px;
  height: 30px;
  cursor: pointer;
  font-size: 0.85rem;
  display: flex; align-items: center; justify-content: center;
  transition: all var(--transition);
  flex-shrink: 0;
}
.btn-delete-card:hover { background: #fdf0ef; border-color: #c0392b; }

/* ─── State Messages ────────────────────────────────────────────────────────── */
.state-msg {
  text-align: center;
  padding: 4rem 1rem;
  color: var(--brown-mid);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}
.empty-icon { font-size: 3rem; }
.spinner {
  width: 36px; height: 36px;
  border: 3px solid var(--cream-dark);
  border-top-color: var(--teal);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.hidden { display: none !important; }

/* ─── Modal ─────────────────────────────────────────────────────────────────── */
.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(30,18,8,0.45);
  backdrop-filter: blur(4px);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  animation: fadeIn 0.2s ease;
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.modal {
  background: var(--white);
  border-radius: 20px;
  padding: 2rem 2rem 1.75rem;
  width: 100%;
  max-width: 520px;
  position: relative;
  box-shadow: var(--shadow-lg);
  animation: slideUp 0.25s ease;
  max-height: 90vh;
  overflow-y: auto;
}
.modal-sm { max-width: 380px; }
@keyframes slideUp { from { opacity: 0; transform: translateY(24px); } to { opacity: 1; transform: translateY(0); } }

.modal-close {
  position: absolute;
  top: 1rem; right: 1rem;
  background: var(--cream);
  border: none;
  width: 32px; height: 32px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 0.85rem;
  color: var(--brown-mid);
  display: flex; align-items: center; justify-content: center;
  transition: background var(--transition);
}
.modal-close:hover { background: var(--cream-dark); }

.modal-title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  color: var(--brown);
  margin-bottom: 1.5rem;
}

.modal-body-text { color: var(--brown-mid); margin-bottom: 1.5rem; font-size: 0.9rem; }

/* ─── Form ──────────────────────────────────────────────────────────────────── */
.form-group { margin-bottom: 1.2rem; display: flex; flex-direction: column; gap: 0.4rem; }

.form-group label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--brown);
}
.req { color: var(--terracotta); }

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.7rem 0.9rem;
  border: 1.5px solid var(--cream-dark);
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: var(--brown);
  background: var(--cream);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
  resize: vertical;
}
.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--teal);
  box-shadow: 0 0 0 3px rgba(74,139,140,0.12);
  background: var(--white);
}
.form-group input.input-error,
.form-group textarea.input-error { border-color: var(--rose); }

.field-error { font-size: 0.78rem; color: #c0392b; min-height: 1em; }
.char-count { font-size: 0.75rem; color: #a09080; text-align: right; }

.form-error {
  background: #fdf0ef;
  border: 1px solid #f5c6cb;
  border-radius: var(--radius-sm);
  padding: 0.65rem 0.9rem;
  font-size: 0.85rem;
  color: #c0392b;
  margin-bottom: 1rem;
}

.form-actions { display: flex; gap: 0.75rem; justify-content: flex-end; margin-top: 1.5rem; }

/* ─── Toast ─────────────────────────────────────────────────────────────────── */
.toast {
  position: fixed;
  bottom: 1.5rem; right: 1.5rem;
  background: var(--brown);
  color: var(--cream);
  padding: 0.75rem 1.3rem;
  border-radius: 50px;
  font-size: 0.875rem;
  box-shadow: var(--shadow-md);
  z-index: 300;
  animation: toastIn 0.3s ease;
  max-width: 320px;
}
.toast.toast-success { background: var(--teal); }
.toast.toast-error   { background: #c0392b; }
@keyframes toastIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

/* ─── Footer ────────────────────────────────────────────────────────────────── */
.site-footer {
  text-align: center;
  padding: 1.5rem 1rem;
  font-size: 0.8rem;
  color: #a09080;
  border-top: 1px solid var(--cream-dark);
  background: var(--cream-dark);
}

/* ─── Responsive ────────────────────────────────────────────────────────────── */
@media (max-width: 640px) {
  .hero { padding: 2rem 1rem 0; }
  .hero-title { font-size: 2rem; }
  .books-grid { grid-template-columns: 1fr; }
  .form-actions { flex-direction: column-reverse; }
  .form-actions button { width: 100%; justify-content: center; }
  .modal { padding: 1.5rem 1.25rem; }
  .toast { left: 1rem; right: 1rem; text-align: center; }
}