/* public/css/courses.css — Light redesign */

/* ── Переменные ──────────────────────────────────────────────── */
:root {
  --blue:        #2563eb;
  --blue-light:  #eff6ff;
  --blue-mid:    #bfdbfe;
  --blue-dark:   #1d4ed8;
  --text-head:   #0f172a;
  --text-body:   #334155;
  --text-muted:  #64748b;
  --surface:     #ffffff;
  --surface-2:   #f8fafc;
  --border:      #e2e8f0;
  --shadow-sm:   0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.04);
  --shadow-md:   0 4px 16px rgba(0,0,0,.08);
  --shadow-lg:   0 12px 32px rgba(0,0,0,.12);
  --radius-sm:   8px;
  --radius-md:   14px;
  --radius-lg:   20px;
  --navbar-h:    64px;
  --transition:  0.25s ease;
}

/* ── Базовые стили ───────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }

body {
  margin: 0;
  padding: 0;
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--surface-2);
  color: var(--text-body);
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

/* ── Layout ──────────────────────────────────────────────────── */
.page-container {
  min-height: calc(100vh - var(--navbar-h));
  padding-bottom: 4rem;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ── Hero-шапка ──────────────────────────────────────────────── */
.section-header {
  background: linear-gradient(135deg, #1e40af 0%, #2563eb 50%, #3b82f6 100%);
  padding: 4rem 1.5rem 5rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.section-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 50%, rgba(255,255,255,.07) 0%, transparent 55%),
    radial-gradient(circle at 80% 20%, rgba(255,255,255,.05) 0%, transparent 45%);
  pointer-events: none;
}

.section-header .container {
  position: relative;
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 800;
  color: #ffffff;
  margin: 0 0 .75rem;
  letter-spacing: -.02em;
  line-height: 1.15;
}

.section-subtitle {
  font-size: 1.05rem;
  color: rgba(255,255,255,.82);
  max-width: 540px;
  margin: 0 auto;
  line-height: 1.6;
}

/* ── Фильтры ─────────────────────────────────────────────────── */
.filters-section {
  max-width: 1200px;
  margin: -2rem auto 2rem;
  padding: 0 1.5rem;
  position: relative;
  z-index: 10;
}

.filters-form {
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 1.5rem;
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 1rem;
  align-items: end;
}

.form-group { position: relative; }

.form-label {
  display: block;
  margin-bottom: .4rem;
  font-size: .82rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: .05em;
}

.input-icon-wrapper { position: relative; }

.input-icon {
  position: absolute;
  left: .9rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: .9rem;
  pointer-events: none;
}

.input {
  width: 100%;
  padding: .75rem 1rem .75rem 2.5rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: .95rem;
  color: var(--text-body);
  background: var(--surface);
  transition: border-color var(--transition), box-shadow var(--transition);
  -webkit-appearance: none;
  appearance: none;
}

.input:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(37,99,235,.12);
}

.input-select { cursor: pointer; }

/* Кнопка поиска */
.filters-form .btn-search {
  padding: .75rem 1.5rem;
  background: var(--blue);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: .95rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  white-space: nowrap;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  box-shadow: 0 4px 12px rgba(37,99,235,.3);
}

.filters-form .btn-search:hover {
  background: var(--blue-dark);
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(37,99,235,.35);
}

/* ── Счётчик результатов ─────────────────────────────────────── */
.results-count {
  padding: 0 1.5rem;
  max-width: 1200px;
  margin: 0 auto 1rem;
  font-size: .9rem;
  color: var(--text-muted);
}

.results-count strong { color: var(--text-body); }

/* ── Сетка карточек ──────────────────────────────────────────── */
.grid-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
  padding: 0 1.5rem;
  max-width: 1200px;
  margin: 0 auto;
}

/* ── Карточка курса ──────────────────────────────────────────── */
.course-card {
  background: var(--surface);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition), box-shadow var(--transition);
}

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

/* Изображение */
.course-image {
  position: relative;
  padding-top: 52%;
  overflow: hidden;
  background: linear-gradient(135deg, #dbeafe 0%, #eff6ff 100%);
}

/* Заглушка когда нет картинки — иконка */
.course-image::before {
  content: '\f19d';
  font-family: 'Font Awesome 6 Free';
  font-weight: 900;
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  color: var(--blue-mid);
  z-index: 1;
}

.img-cover {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 2;
  transition: transform .5s ease;
}

.course-card:hover .img-cover { transform: scale(1.05); }

/* Бейдж уровня */
.course-overlay {
  position: absolute;
  top: .85rem;
  right: .85rem;
  z-index: 3;
}

.course-level {
  background: rgba(37,99,235,.88);
  backdrop-filter: blur(4px);
  color: #fff;
  font-size: .72rem;
  font-weight: 700;
  padding: .3rem .75rem;
  border-radius: 999px;
  letter-spacing: .04em;
  text-transform: uppercase;
}

/* Тег категории */
.course-category-tag {
  position: absolute;
  top: .85rem;
  left: .85rem;
  z-index: 3;
  background: rgba(255,255,255,.9);
  color: var(--blue);
  font-size: .7rem;
  font-weight: 700;
  padding: .28rem .7rem;
  border-radius: 999px;
  letter-spacing: .04em;
  text-transform: uppercase;
  border: 1px solid var(--blue-mid);
}

/* Тело карточки */
.course-content {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.course-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-head);
  margin: 0 0 .5rem;
  line-height: 1.45;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.course-description {
  font-size: .875rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 1rem;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Метаданные */
.course-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
  padding: .6rem .75rem;
  background: var(--surface-2);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.course-tests,
.course-progress {
  font-size: .8rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: .3rem;
}

.course-tests i { color: var(--blue); }

/* Прогресс-бар */
.progress-bar-wrapper {
  margin-bottom: 1rem;
}

.progress-label {
  display: flex;
  justify-content: space-between;
  font-size: .75rem;
  color: var(--text-muted);
  margin-bottom: .35rem;
}

.progress-track {
  height: 5px;
  background: var(--border);
  border-radius: 999px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--blue) 0%, #60a5fa 100%);
  border-radius: 999px;
  transition: width .6s ease;
  min-width: 0;
}

/* Кнопка карточки */
.btn-card {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: .45rem;
  padding: .7rem 1rem;
  background: var(--blue-light);
  color: var(--blue);
  border-radius: var(--radius-sm);
  font-size: .9rem;
  font-weight: 600;
  border: 1.5px solid var(--blue-mid);
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition), box-shadow var(--transition);
  margin-top: auto;
}

.btn-card:hover {
  background: var(--blue);
  color: #fff;
  border-color: var(--blue);
  box-shadow: 0 4px 14px rgba(37,99,235,.25);
  text-decoration: none;
}

/* ── Алерты ──────────────────────────────────────────────────── */
.alerts-wrapper {
  position: fixed;
  top: calc(var(--navbar-h) + .75rem);
  right: 1rem;
  z-index: 1100;
  display: flex;
  flex-direction: column;
  gap: .5rem;
  max-width: 360px;
}

.alert {
  display: flex;
  align-items: flex-start;
  gap: .6rem;
  padding: .9rem 1.2rem;
  border-radius: var(--radius-sm);
  font-size: .9rem;
  box-shadow: var(--shadow-md);
  animation: slideIn .3s ease forwards;
}

.alert-success { background: #f0fdf4; color: #166534; border: 1px solid #bbf7d0; }
.alert-danger  { background: #fef2f2; color: #991b1b; border: 1px solid #fecaca; }

.alert-close {
  margin-left: auto;
  background: none;
  border: none;
  cursor: pointer;
  color: inherit;
  opacity: .6;
  padding: 0;
  font-size: .85rem;
  flex-shrink: 0;
}
.alert-close:hover { opacity: 1; }

@keyframes slideIn {
  from { opacity: 0; transform: translateX(20px); }
  to   { opacity: 1; transform: translateX(0); }
}

.animate-fadeOut { animation: slideOut .3s ease forwards; }

@keyframes slideOut {
  from { opacity: 1; transform: translateX(0); }
  to   { opacity: 0; transform: translateX(20px); }
}

/* ── Пустое состояние ────────────────────────────────────────── */
.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 5rem 2rem;
  background: var(--surface);
  border-radius: var(--radius-md);
  border: 1.5px dashed var(--border);
  color: var(--text-muted);
}

.empty-state i {
  font-size: 3rem;
  color: var(--blue-mid);
  margin-bottom: 1rem;
  display: block;
}

.empty-state p { font-size: 1rem; margin: 0; }

/* ── Пагинация ───────────────────────────────────────────────── */
.pagination-wrapper {
  margin-top: 3rem;
  padding: 0 1.5rem;
}

.pagination {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: .4rem;
}

.pagination-item {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 38px;
  height: 38px;
  padding: 0 .5rem;
  border-radius: var(--radius-sm);
  font-size: .9rem;
  font-weight: 500;
  color: var(--text-body);
  background: var(--surface);
  border: 1.5px solid var(--border);
  transition: all var(--transition);
}

.pagination-item:hover {
  border-color: var(--blue);
  color: var(--blue);
  background: var(--blue-light);
}

.pagination-item.active {
  background: var(--blue);
  color: #fff;
  border-color: var(--blue);
  box-shadow: 0 4px 12px rgba(37,99,235,.3);
}

/* ── Утилиты ─────────────────────────────────────────────────── */
.text-center { text-align: center; }
.mb-5 { margin-bottom: 3rem; }
.mt-5 { margin-top: 3rem; }
.me-1 { margin-right: .25rem; }
.me-2 { margin-right: .5rem; }

/* ── Адаптивность ────────────────────────────────────────────── */
@media (max-width: 900px) {
  .filters-form {
    grid-template-columns: 1fr 1fr;
  }
  .filters-form .btn-search {
    grid-column: 1 / -1;
    justify-content: center;
  }
}

@media (max-width: 640px) {
  .section-header { padding: 3rem 1rem 4rem; }

  .filters-form {
    grid-template-columns: 1fr;
    padding: 1.25rem;
  }

  .grid-container {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .course-image { padding-top: 48%; }
}