/* ============================================================
   eStudyIT — Courses Module Styles
   Designed to coexist with the existing TutorDesk base.css.
   All rules scoped under .courses-*, .course-*, .admin-courses, .portal,
   .checkout-*  — won't bleed into the rest of the app.
   ============================================================ */

:root {
  --c-bg:        #ffffff;
  --c-surface:   #fafafa;
  --c-border:    #e6e8eb;
  --c-text:      #0f121a;
  --c-muted:     #6b7280;
  --c-primary:   #E8000D;            /* eStudyIT red */
  --c-primary-d: #b30009;
  --c-accent:    #0f121a;
  --c-success:   #16a34a;
  --c-warn:      #f59e0b;
  --c-danger:    #dc2626;
  --c-info:      #2563eb;
  --radius:      10px;
  --shadow-sm:   0 1px 2px rgba(15,18,26,0.05);
  --shadow:      0 4px 12px rgba(15,18,26,0.08);
  --font:        'Outfit', system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

/* ---------- Buttons (only if base.css doesn't already provide) ---------- */
.courses-public .btn,
.course-detail .btn,
.admin-courses .btn,
.portal .btn,
.portal-course .btn,
.portal-lesson .btn,
.checkout-form-page .btn,
.checkout-success-page .btn {
  display: inline-block;
  padding: 0.65rem 1.2rem;
  border-radius: var(--radius);
  border: 1px solid var(--c-border);
  background: #fff;
  color: var(--c-text);
  font: 600 0.95rem/1 var(--font);
  cursor: pointer;
  text-decoration: none;
  transition: all 0.15s ease;
}
.btn-primary { background: var(--c-primary); border-color: var(--c-primary); color: #fff; }
.btn-primary:hover { background: var(--c-primary-d); border-color: var(--c-primary-d); }
.btn-outline { background: transparent; }
.btn-danger { background: var(--c-danger); border-color: var(--c-danger); color: #fff; }
.btn-lg { padding: 0.9rem 1.8rem; font-size: 1.05rem; }
.btn-sm { padding: 0.4rem 0.75rem; font-size: 0.85rem; }
.btn-block { display: block; width: 100%; text-align: center; }

.muted { color: var(--c-muted); }
.small { font-size: 0.85rem; }
.center { text-align: center; }
.num { text-align: right; font-variant-numeric: tabular-nums; }

/* ============================================================
   PUBLIC CATALOGUE
   ============================================================ */

.courses-hero {
  padding: 4rem 0 3rem;
  background: linear-gradient(135deg, #0f121a 0%, #1a1f2e 100%);
  color: #fff;
  text-align: center;
}
.courses-hero h1 { font-size: 2.5rem; margin: 0 0 0.5rem; font-weight: 700; }
.courses-hero .lead { font-size: 1.15rem; opacity: 0.85; margin: 0 0 2rem; }

.courses-search {
  max-width: 560px;
  margin: 0 auto;
  display: flex;
  gap: 0.5rem;
  background: #fff;
  padding: 0.4rem;
  border-radius: 999px;
  box-shadow: var(--shadow);
}
.courses-search input {
  flex: 1;
  border: 0;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  outline: 0;
  background: transparent;
}
.courses-search button {
  border: 0;
  background: var(--c-primary);
  color: #fff;
  padding: 0.75rem 1.5rem;
  border-radius: 999px;
  font-weight: 600;
  cursor: pointer;
}

.courses-grid-section { padding: 3rem 0; background: var(--c-bg); }
.courses-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 2.5rem;
}
@media (max-width: 820px) { .courses-layout { grid-template-columns: 1fr; } }

.courses-sidebar h3 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--c-muted);
  margin: 0 0 0.75rem;
}
.courses-filter-list { list-style: none; padding: 0; margin: 0; }
.courses-filter-list li { margin: 0.15rem 0; }
.courses-filter-list a {
  display: flex;
  justify-content: space-between;
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  color: var(--c-text);
  text-decoration: none;
  font-size: 0.95rem;
}
.courses-filter-list a:hover { background: var(--c-surface); }
.courses-filter-list a.active { background: var(--c-text); color: #fff; }
.courses-filter-list .count { color: var(--c-muted); font-size: 0.85em; }
.courses-filter-list a.active .count { color: rgba(255,255,255,0.7); }

.courses-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.course-card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.2s, box-shadow 0.2s;
  display: flex;
  flex-direction: column;
}
.course-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.course-card__media {
  display: block;
  position: relative;
  aspect-ratio: 16/10;
  background: #f3f4f6;
}
.course-card__media img { width: 100%; height: 100%; object-fit: cover; display: block; }
.course-card__placeholder {
  display: flex; align-items: center; justify-content: center;
  height: 100%;
  background: linear-gradient(135deg, #0f121a, #2d3447);
  color: rgba(255,255,255,0.7);
  font-weight: 600;
}
.course-card__level {
  position: absolute; top: 0.75rem; right: 0.75rem;
  background: rgba(15,18,26,0.85); color: #fff;
  padding: 0.25rem 0.6rem; border-radius: 999px;
  font-size: 0.75rem; font-weight: 600;
}
.course-card__body { padding: 1.25rem; display: flex; flex-direction: column; flex: 1; }
.course-card__cat {
  text-transform: uppercase; letter-spacing: 0.05em;
  font-size: 0.75rem; font-weight: 700; color: var(--c-primary);
  margin-bottom: 0.4rem;
}
.course-card h3 { margin: 0 0 0.5rem; font-size: 1.1rem; line-height: 1.35; }
.course-card h3 a { color: var(--c-text); text-decoration: none; }
.course-card h3 a:hover { color: var(--c-primary); }
.course-card__sub { color: var(--c-muted); margin: 0 0 0.75rem; font-size: 0.9rem; }
.course-card__meta {
  display: flex; gap: 1rem; color: var(--c-muted);
  font-size: 0.85rem; margin-bottom: 1rem;
}
.course-card__foot {
  margin-top: auto;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding-top: 1rem; border-top: 1px solid var(--c-border);
}
.course-card__price .was {
  text-decoration: line-through; color: var(--c-muted);
  font-size: 0.85rem; margin-right: 0.3rem;
}
.course-card__price .now { font-size: 1.25rem; font-weight: 700; color: var(--c-text); }

.courses-empty { text-align: center; padding: 3rem; color: var(--c-muted); }
.courses-pagination {
  display: flex; gap: 1rem; align-items: center; justify-content: center;
  margin-top: 2.5rem;
}
.courses-pagination a {
  padding: 0.5rem 1rem; border: 1px solid var(--c-border);
  border-radius: 6px; color: var(--c-text); text-decoration: none;
}

/* ============================================================
   COURSE DETAIL
   ============================================================ */

.course-detail__hero {
  padding: 4rem 0;
  background: linear-gradient(135deg, #0f121a, #1a1f2e);
  background-size: cover; background-position: center;
  color: #fff;
}
.course-detail__cat {
  display: inline-block;
  background: var(--c-primary); color: #fff;
  padding: 0.3rem 0.75rem; border-radius: 999px;
  font-size: 0.75rem; font-weight: 700; letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}
.course-detail h1 { font-size: 2.5rem; margin: 0 0 0.5rem; max-width: 800px; }
.course-detail .lead { font-size: 1.2rem; opacity: 0.85; max-width: 700px; margin: 0 0 1.5rem; }
.course-detail__meta { display: flex; gap: 1.5rem; flex-wrap: wrap; opacity: 0.9; }

.course-detail__body { padding: 3rem 0; }
.course-detail__layout {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 3rem;
}
@media (max-width: 900px) { .course-detail__layout { grid-template-columns: 1fr; } }

.course-detail__main h2 { font-size: 1.5rem; margin: 2rem 0 1rem; }
.course-detail__main h2:first-child { margin-top: 0; }
.course-detail__description { line-height: 1.7; }
.course-detail__description p { margin: 0 0 1rem; }

.course-detail__lessons { list-style: none; padding: 0; margin: 0; }
.course-detail__lessons li { border-bottom: 1px solid var(--c-border); }
.course-detail__lessons a {
  display: grid;
  grid-template-columns: auto 1fr auto auto;
  gap: 1rem; align-items: center;
  padding: 1rem 0;
  text-decoration: none; color: var(--c-text);
}
.course-detail__lessons .lesson-no {
  width: 32px; height: 32px;
  background: var(--c-surface); border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-weight: 600; color: var(--c-muted);
}
.course-detail__lessons .lesson-tag {
  background: var(--c-success); color: #fff;
  padding: 0.2rem 0.6rem; border-radius: 999px;
  font-size: 0.75rem; font-weight: 600;
}

.course-cta {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  position: sticky; top: 100px;
}
.course-cta__price { text-align: center; margin-bottom: 1rem; }
.course-cta__price .was { text-decoration: line-through; color: var(--c-muted); margin-right: 0.5rem; }
.course-cta__price .now { font-size: 2.5rem; font-weight: 700; color: var(--c-text); }
.course-cta__hint { text-align: center; color: var(--c-muted); font-size: 0.9rem; margin: 0 0 1.5rem; }
.course-cta__features { list-style: none; padding: 0; margin: 1.5rem 0 0; font-size: 0.9rem; }
.course-cta__features li { padding: 0.4rem 0; color: var(--c-muted); }

/* ============================================================
   CHECKOUT
   ============================================================ */

.checkout-form-page, .checkout-success-page { padding: 3rem 0; }
.checkout-grid {
  display: grid; grid-template-columns: 1fr 360px; gap: 2.5rem;
  max-width: 900px; margin: 0 auto;
}
@media (max-width: 720px) { .checkout-grid { grid-template-columns: 1fr; } }

.checkout-form, .checkout-summary {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 2rem;
}
.checkout-form h1 { margin-top: 0; }
.checkout-form label { display: block; margin: 1.25rem 0; }
.checkout-form label span { display: block; margin-bottom: 0.4rem; font-weight: 600; font-size: 0.9rem; }
.checkout-form input, .checkout-form textarea, .checkout-form select {
  width: 100%; padding: 0.65rem 0.85rem;
  border: 1px solid var(--c-border); border-radius: 6px;
  font: inherit;
}

.checkout-summary__course {
  display: flex; gap: 1rem; align-items: center;
  padding-bottom: 1rem; border-bottom: 1px solid var(--c-border); margin-bottom: 1rem;
}
.checkout-summary__course img {
  width: 64px; height: 64px; border-radius: 6px; object-fit: cover;
}
.checkout-summary__line {
  display: flex; justify-content: space-between; align-items: center;
  font-weight: 700;
}
.checkout-summary__price { font-size: 1.5rem; }

.checkout-success {
  max-width: 600px; margin: 3rem auto; text-align: center;
  background: #fff; border: 1px solid var(--c-border);
  border-radius: var(--radius); padding: 3rem 2rem;
}
.checkout-success__icon {
  width: 80px; height: 80px;
  background: var(--c-success); color: #fff;
  border-radius: 50%; font-size: 2.5rem; line-height: 80px;
  margin: 0 auto 1.5rem;
}
.checkout-success__actions {
  display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap;
  margin-top: 2rem;
}

/* ============================================================
   ADMIN
   ============================================================ */

.admin-courses { padding: 2rem 0; }
.admin-courses__header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 2rem; gap: 1rem; flex-wrap: wrap;
}
.admin-courses__actions { display: flex; gap: 0.5rem; }

.admin-stats {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem; margin-bottom: 2rem;
}
.admin-stat {
  background: #fff; border: 1px solid var(--c-border);
  border-radius: var(--radius); padding: 1.25rem;
}
.admin-stat__label {
  display: block; text-transform: uppercase; letter-spacing: 0.05em;
  font-size: 0.75rem; color: var(--c-muted); font-weight: 700;
}
.admin-stat__value {
  display: block; font-size: 2rem; font-weight: 700; margin: 0.3rem 0;
}
.admin-stat__sub { display: block; font-size: 0.85rem; color: var(--c-muted); }
.admin-stat--accent { background: var(--c-primary); border-color: var(--c-primary); color: #fff; }
.admin-stat--accent .admin-stat__label,
.admin-stat--accent .admin-stat__sub { color: rgba(255,255,255,0.85); }

.admin-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem;
}
@media (max-width: 820px) { .admin-grid { grid-template-columns: 1fr; } }

.admin-card {
  background: #fff; border: 1px solid var(--c-border);
  border-radius: var(--radius); overflow: hidden;
}
.admin-card > header {
  padding: 1rem 1.25rem; border-bottom: 1px solid var(--c-border);
}
.admin-card > header h2 { margin: 0; font-size: 1.1rem; }

.admin-filters {
  display: flex; gap: 0.5rem; margin-bottom: 1rem;
}
.admin-filters input, .admin-filters select {
  padding: 0.5rem 0.75rem; border: 1px solid var(--c-border); border-radius: 6px;
}

.admin-table {
  width: 100%; background: #fff;
  border: 1px solid var(--c-border); border-radius: var(--radius);
  border-collapse: separate; border-spacing: 0;
}
.admin-table th, .admin-table td {
  padding: 0.85rem 1rem; text-align: left; border-bottom: 1px solid var(--c-border);
}
.admin-table th {
  background: var(--c-surface);
  font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.05em;
  color: var(--c-muted);
}
.admin-table tr:last-child td { border-bottom: 0; }
.admin-table .actions a, .admin-table .actions button {
  margin-right: 0.5rem; font-size: 0.85rem;
}

.admin-feed { list-style: none; padding: 1rem 1.25rem; margin: 0; }
.admin-feed li { padding: 0.6rem 0; border-bottom: 1px solid var(--c-border); font-size: 0.95rem; }
.admin-feed li:last-child { border-bottom: 0; }

.badge {
  display: inline-block; padding: 0.2rem 0.55rem;
  border-radius: 999px; font-size: 0.75rem; font-weight: 600;
  text-transform: capitalize;
}
.badge--draft { background: #f3f4f6; color: #4b5563; }
.badge--published, .badge--active { background: #dcfce7; color: #166534; }
.badge--completed { background: #dbeafe; color: #1e40af; }
.badge--archived { background: #fef3c7; color: #92400e; }
.badge--pending { background: #fef3c7; color: #92400e; }
.badge--cancelled { background: #fee2e2; color: #991b1b; }
.badge--refunded { background: #f3e8ff; color: #6b21a8; }
.badge--preview { background: var(--c-success); color: #fff; }

.admin-form { padding: 1rem; }
.admin-form label { display: block; margin: 1rem 0; }
.admin-form label > span { display: block; font-weight: 600; margin-bottom: 0.35rem; font-size: 0.9rem; }
.admin-form input[type=text],
.admin-form input[type=url],
.admin-form input[type=email],
.admin-form input[type=tel],
.admin-form input[type=number],
.admin-form textarea, .admin-form select {
  width: 100%; padding: 0.6rem 0.85rem;
  border: 1px solid var(--c-border); border-radius: 6px;
  font: inherit;
}
.admin-form textarea { font-family: ui-monospace, monospace; font-size: 0.9rem; }
.admin-form__row {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem;
}
.admin-form__grid {
  display: grid; grid-template-columns: 1fr 280px; gap: 1.5rem; padding: 1.5rem;
}
@media (max-width: 900px) { .admin-form__grid { grid-template-columns: 1fr; } }
.admin-form fieldset {
  border: 1px solid var(--c-border); border-radius: var(--radius);
  padding: 1rem 1.5rem 1.5rem; margin-bottom: 1.5rem; background: #fff;
}
.admin-form legend { padding: 0 0.5rem; font-weight: 700; }
.admin-form__check input { margin-right: 0.5rem; }
.admin-form__actions { display: flex; gap: 0.5rem; margin-top: 1rem; }

.admin-lesson-list { list-style: none; padding: 0; margin: 0; }
.admin-lesson-list li {
  background: #fff; border: 1px solid var(--c-border);
  border-radius: var(--radius); margin-bottom: 0.5rem;
}
.admin-lesson-list summary {
  padding: 1rem 1.25rem; cursor: pointer;
  display: flex; align-items: center; gap: 0.75rem;
}
.admin-lesson-list summary .drag { color: var(--c-muted); cursor: grab; }
.admin-lesson-list details[open] summary { border-bottom: 1px solid var(--c-border); }
.admin-lesson-list details .admin-form { padding: 1.5rem; }

/* ============================================================
   STUDENT PORTAL
   ============================================================ */

.portal { padding: 2.5rem 0; }
.portal__header { margin-bottom: 2rem; }
.portal__header h1 { margin: 0 0 0.3rem; }
.portal__grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}
.portal__empty {
  background: #fff; border: 1px solid var(--c-border);
  border-radius: var(--radius); padding: 3rem; text-align: center;
}

.portal-card {
  background: #fff; border: 1px solid var(--c-border);
  border-radius: var(--radius); overflow: hidden;
}
.portal-card__media { display: block; aspect-ratio: 16/9; background: #f3f4f6; }
.portal-card__media img { width: 100%; height: 100%; object-fit: cover; }
.portal-card__placeholder {
  display: flex; align-items: center; justify-content: center; height: 100%;
  background: linear-gradient(135deg, #0f121a, #2d3447);
  color: rgba(255,255,255,0.7); font-weight: 600;
}
.portal-card__body { padding: 1.25rem; }
.portal-card__body h3 { margin: 0 0 0.75rem; font-size: 1.05rem; }
.portal-card__body h3 a { color: var(--c-text); text-decoration: none; }

.portal-card__progress { margin: 1rem 0; }
.portal-card__bar {
  height: 6px; background: #f3f4f6; border-radius: 999px; overflow: hidden;
}
.portal-card__bar span {
  display: block; height: 100%;
  background: var(--c-primary); transition: width 0.4s;
}
.portal-card__progress small { display: block; margin-top: 0.4rem; color: var(--c-muted); }

.portal-course { padding: 2rem 0; }
.portal-course__header { margin-bottom: 2rem; }
.portal-course__progress { margin-top: 1rem; max-width: 500px; }

.portal-lesson-list { list-style: none; padding: 0; margin: 0; }
.portal-lesson-list li { margin-bottom: 0.5rem; }
.portal-lesson-list a {
  display: grid; grid-template-columns: auto 1fr auto; gap: 1rem;
  align-items: center;
  padding: 1rem 1.25rem;
  background: #fff; border: 1px solid var(--c-border); border-radius: var(--radius);
  text-decoration: none; color: var(--c-text);
}
.portal-lesson-list a:hover { border-color: var(--c-primary); }
.portal-lesson-list .check {
  width: 32px; height: 32px; border-radius: 50%;
  background: var(--c-surface); color: var(--c-muted);
  display: flex; align-items: center; justify-content: center; font-weight: 600;
}
.portal-lesson-list .check--done { background: var(--c-success); color: #fff; }

.portal-lesson { padding: 2rem 0; max-width: 900px; }
.portal-lesson__header { margin-bottom: 1.5rem; }
.portal-lesson__header h1 { margin: 0.5rem 0 0; }
.portal-lesson__video {
  background: #000; border-radius: var(--radius); overflow: hidden;
  aspect-ratio: 16/9; margin-bottom: 1.5rem;
}
.portal-lesson__video iframe,
.portal-lesson__video video { width: 100%; height: 100%; display: block; }
.portal-lesson__content { line-height: 1.7; margin: 1.5rem 0; }
.portal-lesson__resource { margin: 1.5rem 0; }
.portal-lesson__nav {
  display: flex; justify-content: space-between; align-items: center;
  padding-top: 1.5rem; border-top: 1px solid var(--c-border); margin-top: 2rem;
}