/* ============================================================
   LIBRIA — Main CSS
   Global layout, components, animations
   ============================================================ */

/* ── Fonts ─────────────────────────────────────── */
html {
  --font-main: 'Inter', system-ui, sans-serif;
  --font-heading: 'Playfair Display', serif;
}
html[data-font="sans"] {
  --font-main: 'Inter', system-ui, sans-serif;
}
html[data-font="serif"] {
  --font-main: 'Playfair Display', serif;
}
html[data-font="times"] {
  --font-main: 'Times New Roman', Times, serif;
  --font-heading: 'Times New Roman', Times, serif;
}

/* ── Body & Typography ─────────────────────────────────────── */
body {
  font-family: var(--font-main);
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  transition: background-color 0.4s ease, color 0.4s ease;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { font-family: var(--font-heading); line-height: 1.25; }
h4, h5, h6, .sans { font-family: 'Inter', sans-serif; }

a { color: var(--accent); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--accent-2); }

/* ── Scrollbar ─────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-secondary); }
::-webkit-scrollbar-thumb { background: var(--scrollbar); border-radius: 3px; }

/* ── App Shell ─────────────────────────────────────────────── */
.app-layout {
  display: flex;
  min-height: 100vh;
}

/* ── Sidebar Nav ───────────────────────────────────────────── */
.sidebar {
  width: 240px;
  min-height: 100vh;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 24px 16px;
  position: fixed;
  top: 0; left: 0;
  z-index: 100;
  transition: all 0.3s ease;
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 36px;
  padding: 0 8px;
}

.sidebar-logo .logo-icon {
  width: 36px; height: 36px;
  background: var(--accent);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 18px;
}

.sidebar-logo .logo-text {
  font-family: 'Playfair Display', serif;
  font-size: 22px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.5px;
}

.nav-section-label {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text-faint);
  padding: 0 12px;
  margin: 20px 0 8px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: 10px;
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s ease;
  margin-bottom: 2px;
  cursor: pointer;
}

.nav-item:hover, .nav-item.active {
  background: var(--accent-glow);
  color: var(--accent);
}

.nav-item .nav-icon { font-size: 18px; width: 20px; text-align: center; }

.sidebar-footer {
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

/* Theme Switcher in sidebar */
.theme-switcher-mini {
  padding: 12px;
  background: var(--bg-card);
  border-radius: 12px;
  border: 1px solid var(--border);
  margin-bottom: 12px;
}

.theme-switcher-mini p {
  font-size: 11px;
  color: var(--text-faint);
  margin-bottom: 8px;
  font-weight: 500;
}

.theme-dots {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.theme-dot {
  width: 22px; height: 22px;
  border-radius: 50%;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all 0.2s;
  position: relative;
}

.theme-dot:hover, .theme-dot.active {
  border-color: var(--accent);
  transform: scale(1.15);
}

.theme-dot[data-theme-target="noir"]     { background: linear-gradient(135deg,#fff,#000); }
.theme-dot[data-theme-target="forest"]   { background: linear-gradient(135deg,#2E3820,#7A9E4E); }
.theme-dot[data-theme-target="paper"]    { background: linear-gradient(135deg,#F4EDE1,#8B6B4A); }
.theme-dot[data-theme-target="midnight"] { background: linear-gradient(135deg,#111827,#4B7BE5); }
.theme-dot[data-theme-target="blush"]    { background: linear-gradient(135deg,#F7E8E8,#C26E7A); }
.theme-dot[data-theme-target="mocha"]    { background: linear-gradient(135deg,#E8DDD0,#9B7355); }

/* ── Main Content Area ─────────────────────────────────────── */
.main-content {
  margin-left: 240px;
  flex: 1;
  min-height: 100vh;
  padding: 32px 40px;
  background: var(--bg);
}

/* ── Top Bar ───────────────────────────────────────────────── */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 32px;
}

.topbar-title { font-size: 24px; font-weight: 700; color: var(--text); }
.topbar-subtitle { font-size: 13px; color: var(--text-muted); margin-top: 2px; }

.topbar-actions { display: flex; align-items: center; gap: 12px; }

/* ── Cards ─────────────────────────────────────────────────── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  box-shadow: var(--shadow);
  transition: all 0.3s ease;
}

.card:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); }
.card-sm { padding: 16px; border-radius: 12px; }

.card-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 16px;
}

/* ── Buttons ───────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 20px;
  border-radius: 10px;
  font-size: 14px; font-weight: 600;
  border: none; cursor: pointer;
  transition: all 0.2s ease;
  font-family: 'Inter', sans-serif;
}

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

.btn-secondary {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
}
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border: none;
}
.btn-ghost:hover { color: var(--accent); background: var(--accent-glow); }

.btn-lg { padding: 14px 28px; font-size: 15px; border-radius: 12px; }
.btn-sm { padding: 6px 14px; font-size: 12px; border-radius: 8px; }

.btn-accent {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 0 0 0 var(--accent-glow);
}
.btn-accent:hover {
  box-shadow: 0 0 20px var(--accent-glow);
  transform: translateY(-1px);
}

/* ── Badges ────────────────────────────────────────────────── */
.badge {
  display: inline-flex; align-items: center;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 11px; font-weight: 600;
  background: var(--tag-bg);
  color: var(--tag-text);
}

/* ── Form Elements ─────────────────────────────────────────── */
.form-group { margin-bottom: 20px; }
.form-label { display: block; font-size: 13px; font-weight: 600; color: var(--text-muted); margin-bottom: 6px; }

.form-control {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  font-size: 14px;
  font-family: 'Inter', sans-serif;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-control:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-control::placeholder { color: var(--text-faint); }

select.form-control {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23888' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 36px;
}

/* ── Grid layouts ──────────────────────────────────────────── */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.grid-auto { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 20px; }

/* ── Stats Widget ──────────────────────────────────────────── */
.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px;
  display: flex; align-items: center; gap: 16px;
}

.stat-icon {
  width: 48px; height: 48px;
  border-radius: 12px;
  background: var(--accent-glow);
  display: flex; align-items: center; justify-content: center;
  font-size: 22px;
}

.stat-value { font-size: 26px; font-weight: 800; color: var(--text); line-height: 1; }
.stat-label { font-size: 12px; color: var(--text-muted); margin-top: 3px; }

/* ── Progress Bar ──────────────────────────────────────────── */
.progress-bar-wrap {
  height: 6px;
  background: var(--bg-secondary);
  border-radius: 3px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 3px;
  transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Textbook Card ─────────────────────────────────────────── */
.book-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  transition: all 0.3s ease;
  cursor: pointer;
}

.book-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border-accent);
}

.book-cover {
  width: 100%; height: 180px;
  object-fit: cover;
  background: var(--gradient-card);
}

.book-cover-placeholder {
  width: 100%; height: 180px;
  background: var(--gradient-card);
  display: flex; align-items: center; justify-content: center;
  font-size: 48px;
}

.book-info { padding: 16px; }
.book-title { font-size: 14px; font-weight: 600; color: var(--text); margin-bottom: 6px; line-height: 1.4; }
.book-meta { font-size: 12px; color: var(--text-muted); }
.book-tags { display: flex; gap: 6px; margin-top: 10px; flex-wrap: wrap; }

/* ── Messages (Django) ─────────────────────────────────────── */
.messages-container { margin-bottom: 20px; }
.message {
  padding: 12px 16px;
  border-radius: 10px;
  font-size: 14px;
  margin-bottom: 8px;
  border-left: 3px solid;
}
.message.error   { background: rgba(220,38,38,0.1); border-color: var(--danger); color: var(--danger); }
.message.success { background: rgba(22,163,74,0.1); border-color: var(--success); color: var(--success); }
.message.info    { background: var(--accent-glow); border-color: var(--accent); color: var(--accent); }

/* ── Animations ────────────────────────────────────────────── */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}
@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 0 0 var(--accent-glow); }
  50%       { box-shadow: 0 0 20px 4px var(--accent-glow); }
}
@keyframes spin {
  to { transform: rotate(360deg); }
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(-8px); }
}

.animate-fadeInUp { animation: fadeInUp 0.5s ease both; }
.animate-fadeIn   { animation: fadeIn 0.4s ease both; }

/* Stagger children */
.stagger-children > *:nth-child(1) { animation-delay: 0.05s; }
.stagger-children > *:nth-child(2) { animation-delay: 0.10s; }
.stagger-children > *:nth-child(3) { animation-delay: 0.15s; }
.stagger-children > *:nth-child(4) { animation-delay: 0.20s; }
.stagger-children > *:nth-child(5) { animation-delay: 0.25s; }
.stagger-children > *:nth-child(6) { animation-delay: 0.30s; }

/* ── Chart container ───────────────────────────────────────── */
.chart-wrap { position: relative; height: 180px; }

/* ── Toast notifications ───────────────────────────────────── */
.toast-container {
  position: fixed; bottom: 24px; right: 24px;
  z-index: 9999; display: flex; flex-direction: column; gap: 8px;
}
.toast {
  padding: 12px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 14px;
  box-shadow: var(--shadow-lg);
  animation: fadeInUp 0.3s ease;
  min-width: 220px;
}

/* ── Utilities ─────────────────────────────────────────────── */
.text-muted  { color: var(--text-muted); }
.text-faint  { color: var(--text-faint); }
.text-accent { color: var(--accent); }
.text-sm     { font-size: 13px; }
.text-xs     { font-size: 11px; }
.font-bold   { font-weight: 700; }
.flex        { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between{ display: flex; align-items: center; justify-content: space-between; }
.gap-8  { gap: 8px; }
.gap-12 { gap: 12px; }
.gap-16 { gap: 16px; }
.gap-20 { gap: 20px; }
.mt-4  { margin-top: 4px; }
.mt-8  { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mb-8  { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.w-full { width: 100%; }
.hidden { display: none !important; }

/* ── Responsive ────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .sidebar { width: 200px; }
  .main-content { margin-left: 200px; padding: 24px; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .main-content { margin-left: 0; padding: 16px; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}