/* === Scolaia Study Console — Material Design 3 === */

/* --- Design Tokens --- */
:root {
  --md-sys-color-primary: #475537;
  --md-sys-color-on-primary: #ffffff;
  --md-sys-color-primary-container: #aab184;
  --md-sys-color-on-primary-container: #1b261f;
  --md-sys-color-secondary: #657a56;
  --md-sys-color-on-secondary: #ffffff;
  --md-sys-color-secondary-container: #e8e5d5;
  --md-sys-color-on-secondary-container: #1b261f;
  --md-sys-color-tertiary: #7b6d45;
  --md-sys-color-on-tertiary: #ffffff;
  --md-sys-color-tertiary-container: #d3a465;
  --md-sys-color-on-tertiary-container: #1b261f;
  --md-sys-color-error: #ba1a1a;
  --md-sys-color-on-error: #ffffff;
  --md-sys-color-error-container: #ffdad6;
  --md-sys-color-on-error-container: #410002;
  --md-sys-color-background: #faf7ee;
  --md-sys-color-on-background: #1b261f;
  --md-sys-color-surface: #faf7ee;
  --md-sys-color-on-surface: #1b261f;
  --md-sys-color-surface-container: #e8e5d5;
  --md-sys-color-surface-variant: #aab184;
  --md-sys-color-on-surface-variant: #5e4d42;
  --md-sys-color-outline: #657a56;
  --md-sys-color-outline-variant: #aab184;
  --md-ref-typeface: 'Inter', system-ui, -apple-system, sans-serif;
  --md-sys-shape-corner-md: 12px;
  --md-sys-shape-corner-sm: 8px;
  --md-sys-shape-corner-lg: 16px;
}

[data-theme="dark"] {
  --md-sys-color-primary: #aab184;
  --md-sys-color-on-primary: #1b261f;
  --md-sys-color-primary-container: #475537;
  --md-sys-color-on-primary-container: #f4f2e7;
  --md-sys-color-secondary: #d3a465;
  --md-sys-color-on-secondary: #1b261f;
  --md-sys-color-secondary-container: #5e4d42;
  --md-sys-color-on-secondary-container: #f4f2e7;
  --md-sys-color-tertiary: #6c7f2d;
  --md-sys-color-on-tertiary: #040803;
  --md-sys-color-tertiary-container: #363c2a;
  --md-sys-color-on-tertiary-container: #f4f2e7;
  --md-sys-color-error: #ffb4ab;
  --md-sys-color-on-error: #690005;
  --md-sys-color-error-container: #93000a;
  --md-sys-color-on-error-container: #ffdad6;
  --md-sys-color-background: #1b261f;
  --md-sys-color-on-background: #f4f2e7;
  --md-sys-color-surface: #1b261f;
  --md-sys-color-on-surface: #f4f2e7;
  --md-sys-color-surface-container: #2b4332;
  --md-sys-color-surface-container-high: #363c2a;
  --md-sys-color-surface-variant: #5e4d42;
  --md-sys-color-on-surface-variant: #aab184;
  --md-sys-color-outline: #aab184;
  --md-sys-color-outline-variant: #657a56;
}

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

body {
  font-family: var(--md-ref-typeface);
  background: var(--md-sys-color-background);
  color: var(--md-sys-color-on-background);
  line-height: 1.6;
  min-height: 100vh;
}

a { color: var(--md-sys-color-secondary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* --- Layout --- */
.app-layout { min-height: 100vh; display: flex; flex-direction: column; }

.navbar {
  background: var(--md-sys-color-surface-container);
  padding: 0 1.5rem;
  height: 64px;
  display: flex;
  align-items: center;
  gap: 2rem;
  border-bottom: 1px solid var(--md-sys-color-outline-variant);
}
.navbar-brand { display: flex; align-items: center; gap: 0.5rem; }
.navbar-logo { font-size: 1.5rem; }
.navbar-title { font-weight: 600; font-size: 1.1rem; color: var(--md-sys-color-on-surface); }
.navbar-nav { display: flex; gap: 0.25rem; flex: 1; }
.nav-link {
  padding: 0.5rem 1rem;
  border-radius: var(--md-sys-shape-corner-sm);
  color: var(--md-sys-color-on-surface-variant);
  font-weight: 500;
  font-size: 0.9rem;
  transition: all 0.2s;
}
.nav-link:hover { background: rgba(170,177,132,0.1); text-decoration: none; }
.nav-link.active {
  background: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
}
.navbar-user { display: flex; align-items: center; gap: 0.75rem; }
.user-name { font-size: 0.85rem; color: var(--md-sys-color-on-surface-variant); }

.main-content { flex: 1; padding: 2rem; max-width: 1200px; margin: 0 auto; width: 100%; }

/* --- Auth Pages --- */
.auth-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--md-sys-color-background);
}
.auth-card {
  background: var(--md-sys-color-surface-container);
  border-radius: var(--md-sys-shape-corner-lg);
  padding: 2.5rem;
  width: 100%;
  max-width: 420px;
  box-shadow: 0 2px 16px rgba(0,0,0,0.2);
}
.auth-header { text-align: center; margin-bottom: 2rem; }
.auth-header h1 { font-size: 1.5rem; font-weight: 700; color: var(--md-sys-color-on-surface); }
.auth-header p { color: var(--md-sys-color-on-surface-variant); margin-top: 0.5rem; font-size: 0.9rem; }
.auth-form { display: flex; flex-direction: column; gap: 1.25rem; }
.auth-footer { text-align: center; margin-top: 1.5rem; }
.auth-link { font-size: 0.85rem; color: var(--md-sys-color-secondary); }

/* --- Forms --- */
.form-group { display: flex; flex-direction: column; gap: 0.375rem; }
.form-group label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--md-sys-color-on-surface-variant);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.form-group input, .form-group select, .form-group textarea {
  padding: 0.75rem 1rem;
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--md-sys-shape-corner-sm);
  background: var(--md-sys-color-surface);
  color: var(--md-sys-color-on-surface);
  font-family: inherit;
  font-size: 0.95rem;
  transition: border-color 0.2s;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  outline: none;
  border-color: var(--md-sys-color-primary);
  box-shadow: 0 0 0 2px rgba(170,177,132,0.2);
}
.form-group input::placeholder { color: var(--md-sys-color-on-surface-variant); opacity: 0.6; }

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.5rem;
  border: none;
  border-radius: var(--md-sys-shape-corner-sm);
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
}
.btn:hover { text-decoration: none; }
.btn-primary {
  background: var(--md-sys-color-primary);
  color: var(--md-sys-color-on-primary);
}
.btn-primary:hover { opacity: 0.9; filter: brightness(1.1); }
.btn-secondary {
  background: var(--md-sys-color-secondary);
  color: var(--md-sys-color-on-secondary);
}
.btn-secondary:hover { opacity: 0.9; }
.btn-text {
  background: transparent;
  color: var(--md-sys-color-secondary);
  padding: 0.5rem 0.75rem;
}
.btn-text:hover { background: rgba(170,177,132,0.1); }
.btn-full { width: 100%; }
.btn-sm { padding: 0.375rem 0.75rem; font-size: 0.8rem; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* --- Alerts --- */
.alert {
  padding: 0.875rem 1.25rem;
  border-radius: var(--md-sys-shape-corner-sm);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}
.alert-error {
  background: var(--md-sys-color-error-container);
  color: var(--md-sys-color-on-error-container);
}
.alert-info {
  background: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
}
.alert-info a { color: inherit; font-weight: 600; text-decoration: underline; }

/* --- Page Header --- */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 2rem;
  flex-wrap: wrap;
  gap: 1rem;
}
.page-header h1 { font-size: 1.5rem; font-weight: 700; }
.page-header p { color: var(--md-sys-color-on-surface-variant); font-size: 0.9rem; width: 100%; }

/* --- Stats Grid --- */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1rem; margin-bottom: 2rem; }
.stat-card {
  background: var(--md-sys-color-surface-container);
  border-radius: var(--md-sys-shape-corner-md);
  padding: 1.5rem;
  text-align: center;
}
.stat-value { font-size: 2.5rem; font-weight: 700; color: var(--md-sys-color-primary); }
.stat-label { font-size: 0.85rem; color: var(--md-sys-color-on-surface-variant); margin-top: 0.25rem; }

/* --- Quick Actions --- */
.quick-actions { display: flex; gap: 1rem; flex-wrap: wrap; }

/* --- Tables --- */
.table-container { overflow-x: auto; }
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}
.data-table th {
  text-align: left;
  padding: 0.75rem 1rem;
  border-bottom: 2px solid var(--md-sys-color-outline-variant);
  color: var(--md-sys-color-on-surface-variant);
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.data-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--md-sys-color-outline-variant);
}
.data-table tbody tr:hover { background: rgba(170,177,132,0.05); }

/* --- Badges --- */
.badge {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.badge-draft { background: var(--md-sys-color-surface-variant); color: var(--md-sys-color-on-surface-variant); }
.badge-validated { background: var(--md-sys-color-tertiary-container); color: var(--md-sys-color-on-tertiary-container); }
.badge-published { background: var(--md-sys-color-primary-container); color: var(--md-sys-color-on-primary-container); }
.badge-archived { background: var(--md-sys-color-surface-variant); color: var(--md-sys-color-on-surface-variant); opacity: 0.7; }
.badge-info { background: var(--md-sys-color-secondary-container); color: var(--md-sys-color-on-secondary-container); }

/* --- Card Grid --- */
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1.25rem; }
.tdl-card {
  background: var(--md-sys-color-surface-container);
  border-radius: var(--md-sys-shape-corner-md);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  border: 1px solid var(--md-sys-color-outline-variant);
  transition: border-color 0.2s;
}
.tdl-card:hover { border-color: var(--md-sys-color-primary); }
.tdl-card-header { display: flex; justify-content: space-between; align-items: flex-start; gap: 0.5rem; }
.tdl-card-header h3 { font-size: 1.1rem; font-weight: 600; }
.tdl-card-subject { font-size: 0.85rem; color: var(--md-sys-color-secondary); font-weight: 500; }
.tdl-card-desc { font-size: 0.9rem; color: var(--md-sys-color-on-surface-variant); flex: 1; }
.tdl-card-meta { display: flex; gap: 1rem; font-size: 0.8rem; color: var(--md-sys-color-on-surface-variant); }

/* --- Empty State --- */
.empty-state {
  text-align: center;
  padding: 3rem;
  color: var(--md-sys-color-on-surface-variant);
}
.empty-state p { margin-bottom: 1rem; }

/* --- Responsive --- */
@media (max-width: 768px) {
  .navbar { padding: 0 1rem; gap: 1rem; }
  .navbar-nav { display: none; }
  .main-content { padding: 1rem; }
  .stats-grid { grid-template-columns: 1fr; }
  .card-grid { grid-template-columns: 1fr; }
}
/* ── Detail page ─────────────────────────────────── */
.detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}
@media (max-width: 768px) {
  .detail-grid { grid-template-columns: 1fr; }
}
.detail-card {
  background: var(--md-surface-container);
  border-radius: var(--md-shape-medium);
  padding: 1.5rem;
}
.detail-card h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--md-on-surface);
  margin: 0 0 1rem;
}
.detail-list {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.25rem 1rem;
}
.detail-list dt {
  color: var(--md-on-surface-variant);
  font-size: 0.85rem;
}
.detail-list dd {
  margin: 0;
  color: var(--md-on-surface);
  font-size: 0.85rem;
}
.detail-desc {
  margin-top: 1rem;
  font-size: 0.9rem;
  color: var(--md-on-surface-variant);
  line-height: 1.5;
}

/* ── File list ───────────────────────────────────── */
.file-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.file-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0;
  font-size: 0.85rem;
  color: var(--md-on-surface);
  border-bottom: 1px solid var(--md-outline-variant);
}
.file-item:last-child { border-bottom: none; }
.file-icon { font-size: 1rem; }

/* ── Status actions ──────────────────────────────── */
.status-actions { padding: 0.25rem 0; }
.action-buttons { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.header-actions { display: flex; gap: 0.5rem; }
.action-cell { white-space: nowrap; }

/* ── Validation report ───────────────────────────── */
.validation-report { padding: 0.25rem 0; }
.alert-warning {
  background: color-mix(in srgb, var(--md-tertiary) 15%, transparent);
  border: 1px solid var(--md-tertiary);
  border-radius: var(--md-shape-small);
  padding: 0.75rem 1rem;
  color: var(--md-on-surface);
  font-size: 0.85rem;
}

/* ── Form card ───────────────────────────────────── */
.form-card {
  background: var(--md-surface-container);
  border-radius: var(--md-shape-medium);
  padding: 2rem;
  max-width: 600px;
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.form-hint {
  display: block;
  margin-top: 0.25rem;
  font-size: 0.8rem;
  color: var(--md-on-surface-variant);
}
.form-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

/* ── Button variants ─────────────────────────────── */
.btn-outlined {
  background: transparent;
  border: 1px solid var(--md-outline);
  color: var(--md-primary);
}
.btn-outlined:hover {
  background: color-mix(in srgb, var(--md-primary) 8%, transparent);
}
.btn-sm {
  padding: 0.35rem 0.75rem;
  font-size: 0.8rem;
}

/* ── Badge variants ──────────────────────────────── */
.badge-draft { background: var(--md-surface-container-high); color: var(--md-on-surface-variant); }
.badge-validated { background: color-mix(in srgb, var(--md-tertiary) 20%, transparent); color: var(--md-tertiary); }
.badge-published { background: color-mix(in srgb, var(--md-primary) 20%, transparent); color: var(--md-primary); }
.badge-archived { background: color-mix(in srgb, var(--md-error) 15%, transparent); color: var(--md-error); }
.badge-Draft { background: var(--md-surface-container-high); color: var(--md-on-surface-variant); }
.badge-Validated { background: color-mix(in srgb, var(--md-tertiary) 20%, transparent); color: var(--md-tertiary); }
.badge-Published { background: color-mix(in srgb, var(--md-primary) 20%, transparent); color: var(--md-primary); }
.badge-Archived { background: color-mix(in srgb, var(--md-error) 15%, transparent); color: var(--md-error); }

.text-muted { color: var(--md-on-surface-variant); font-size: 0.85rem; }

/* ── Student components ──────────────────────────── */

/* Package grid */
.package-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}
.package-card {
  background: var(--md-surface-container);
  border-radius: var(--md-shape-medium);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
}
.package-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}
.package-card-header h3 {
  font-size: 1.1rem;
  margin: 0;
  color: var(--md-on-surface);
}
.package-desc {
  font-size: 0.85rem;
  color: var(--md-on-surface-variant);
  line-height: 1.5;
  flex: 1;
}
.package-meta {
  display: flex;
  gap: 1rem;
  font-size: 0.8rem;
  color: var(--md-on-surface-variant);
  margin-top: 0.5rem;
}
.package-card-actions {
  margin-top: 1rem;
}

/* Progress bar */
.progress-bar {
  background: var(--md-surface-container-high);
  border-radius: 999px;
  height: 1.5rem;
  position: relative;
  overflow: hidden;
}
.progress-fill {
  background: var(--md-primary);
  height: 100%;
  border-radius: 999px;
  transition: width 0.3s ease;
  min-width: 0;
}
.progress-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--md-on-surface);
}

/* Study navigation cards */
.study-nav {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}
.study-nav-card {
  background: var(--md-surface-container);
  border-radius: var(--md-shape-medium);
  padding: 1.5rem;
  text-decoration: none;
  color: var(--md-on-surface);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  transition: background 0.2s;
}
.study-nav-card:hover {
  background: var(--md-surface-container-high);
}
.study-nav-icon { font-size: 2rem; }
.study-nav-title {
  font-weight: 600;
  font-size: 1rem;
}
.study-nav-desc {
  font-size: 0.85rem;
  color: var(--md-on-surface-variant);
}

/* Lesson list */
.lesson-list { display: flex; flex-direction: column; gap: 0.25rem; }
.lesson-item { border-radius: var(--md-shape-small); }
.lesson-link {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem 1rem;
  text-decoration: none;
  color: var(--md-on-surface);
  border-radius: var(--md-shape-small);
  transition: background 0.15s;
}
.lesson-link:hover { background: var(--md-surface-container-high); }
.lesson-number {
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--md-primary);
  color: var(--md-on-primary);
  font-weight: 600;
  font-size: 0.85rem;
  flex-shrink: 0;
}
.lesson-title { flex: 1; }
.lesson-units { font-size: 0.8rem; color: var(--md-on-surface-variant); }

/* Guided study layout */
.guided-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 1.5rem;
  min-height: 60vh;
}
@media (max-width: 768px) {
  .guided-layout { grid-template-columns: 1fr; }
}
.guided-sidebar {
  background: var(--md-surface-container);
  border-radius: var(--md-shape-medium);
  padding: 1.25rem;
}
.guided-sidebar h3 {
  font-size: 0.9rem;
  margin: 0 0 1rem;
  color: var(--md-primary);
}
.lesson-nav { display: flex; flex-direction: column; gap: 0.25rem; }
.lesson-nav-item a {
  display: block;
  padding: 0.5rem 0.75rem;
  text-decoration: none;
  color: var(--md-on-surface-variant);
  font-size: 0.85rem;
  border-radius: var(--md-shape-small);
}
.lesson-nav-item.active a {
  color: var(--md-on-surface);
  background: var(--md-surface-container-high);
  font-weight: 500;
}
.unit-nav {
  list-style: none;
  padding: 0.25rem 0 0 1.5rem;
  margin: 0;
}
.unit-nav li {
  font-size: 0.8rem;
  padding: 0.25rem 0;
  color: var(--md-on-surface-variant);
}
.unit-nav li.current {
  color: var(--md-primary);
  font-weight: 500;
}
.guided-content {
  background: var(--md-surface-container);
  border-radius: var(--md-shape-medium);
  padding: 2rem;
}
.unit-header h2 {
  margin: 0 0 0.5rem;
  font-size: 1.3rem;
}
.unit-objectives {
  font-size: 0.85rem;
  color: var(--md-on-surface-variant);
  margin-bottom: 1rem;
}
.unit-objectives ul { margin: 0.25rem 0 0 1.5rem; padding: 0; }
.markdown-content {
  line-height: 1.7;
  font-size: 0.95rem;
  white-space: pre-wrap;
}
.content-area { min-height: 200px; }

/* Chat */
.chat-container {
  background: var(--md-surface-container);
  border-radius: var(--md-shape-medium);
  display: flex;
  flex-direction: column;
  height: 60vh;
}
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.chat-message { display: flex; }
.chat-message.user { justify-content: flex-end; }
.chat-bubble {
  max-width: 70%;
  padding: 0.75rem 1rem;
  border-radius: var(--md-shape-medium);
  font-size: 0.9rem;
  line-height: 1.5;
}
.chat-message.assistant .chat-bubble {
  background: var(--md-surface-container-high);
  color: var(--md-on-surface);
}
.chat-message.user .chat-bubble {
  background: var(--md-primary);
  color: var(--md-on-primary);
}
.chat-input-area {
  display: flex;
  gap: 0.75rem;
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--md-outline-variant);
}

/* Materials grid */
.materials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}
.material-card {
  background: var(--md-surface-container);
  border-radius: var(--md-shape-medium);
  padding: 1.5rem;
  text-align: center;
}
.material-icon { font-size: 2.5rem; display: block; margin-bottom: 0.75rem; }
.material-card h3 { margin: 0 0 0.5rem; font-size: 1rem; }
.material-card p { font-size: 0.85rem; color: var(--md-on-surface-variant); margin: 0 0 1rem; }

/* Alert info */
.alert-info {
  background: color-mix(in srgb, var(--md-primary) 12%, transparent);
  border: 1px solid var(--md-primary);
  border-radius: var(--md-shape-small);
  padding: 0.75rem 1rem;
  color: var(--md-on-surface);
  font-size: 0.9rem;
}