/* app.css — course hub and admin styles for CodeWithAltin */

/* ── Navigation ──────────────────────────────────────────────────────────── */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 15, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1100px;
  margin: 0 auto;
  padding: 16px 24px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 4px;
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

.nav-brand-mono {
  color: var(--accent);
  font-weight: 700;
  font-family: var(--font-mono);
}

.nav-brand-sep {
  color: var(--fg-dim);
  margin: 0 2px;
}

.nav-brand-name {
  color: var(--fg-secondary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-link {
  color: var(--fg-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-link:hover {
  color: var(--fg-primary);
}

.nav-cta {
  background: var(--accent);
  color: #000;
  padding: 8px 18px;
  border-radius: 8px;
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 700;
  font-family: var(--font-mono);
  transition: opacity 0.2s, transform 0.15s;
}

.nav-cta:hover {
  opacity: 0.85;
  transform: translateY(-1px);
}

/* ── Shared app layout ────────────────────────────────────────────────────── */
.app-main {
  min-height: calc(100vh - 120px);
}

/* ── Buttons ─────────────────────────────────────────────────────────────── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  background: var(--accent);
  color: #000;
  padding: 10px 22px;
  border-radius: 8px;
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 700;
  font-family: var(--font-mono);
  border: none;
  cursor: pointer;
  transition: opacity 0.2s;
}

.btn-primary:hover {
  opacity: 0.85;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  background: transparent;
  color: var(--fg-secondary);
  padding: 10px 20px;
  border-radius: 8px;
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  border: 1px solid var(--border);
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
}

.btn-secondary:hover {
  border-color: var(--fg-secondary);
  color: var(--fg-primary);
}

/* ── Hero CTA ─────────────────────────────────────────────────────────────── */
.hero-actions {
  position: relative;
  z-index: 1;
  display: flex;
  gap: 16px;
  margin-top: 36px;
  flex-wrap: wrap;
  justify-content: center;
}

.hero-cta-primary {
  background: var(--accent);
  color: #000;
  padding: 14px 32px;
  border-radius: 10px;
  text-decoration: none;
  font-size: 1rem;
  font-weight: 700;
  font-family: var(--font-mono);
  transition: opacity 0.2s, transform 0.15s;
}

.hero-cta-primary:hover {
  opacity: 0.85;
  transform: translateY(-2px);
}

.hero-cta-secondary {
  background: transparent;
  color: var(--fg-secondary);
  padding: 14px 32px;
  border-radius: 10px;
  text-decoration: none;
  font-size: 1rem;
  font-weight: 600;
  border: 1px solid var(--border);
  transition: border-color 0.2s, color 0.2s;
}

.hero-cta-secondary:hover {
  border-color: var(--fg-secondary);
  color: var(--fg-primary);
}

/* ── Course listing ──────────────────────────────────────────────────────── */
.courses-header {
  padding: 60px 24px 32px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.courses-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 500px;
  height: 300px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  pointer-events: none;
}

.courses-header-inner {
  position: relative;
  z-index: 1;
}

.courses-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
}

.courses-lede {
  color: var(--fg-secondary);
  max-width: 520px;
  margin: 0 auto;
  line-height: 1.7;
  font-size: 1.05rem;
}

/* ── Filter bar ──────────────────────────────────────────────────────────── */
.filter-bar {
  padding: 24px 24px 0;
}

.filter-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  max-width: 1100px;
  margin: 0 auto;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

.filter-pill {
  display: inline-flex;
  align-items: center;
  padding: 6px 16px;
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 600;
  font-family: var(--font-mono);
  text-decoration: none;
  border: 1px solid var(--border);
  color: var(--fg-secondary);
  background: transparent;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}

.filter-pill:hover,
.filter-pill.active {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-glow);
}

/* ── Course grid ─────────────────────────────────────────────────────────── */
.courses-grid-section {
  padding: 40px 24px 80px;
}

.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
  max-width: 1100px;
  margin: 0 auto;
}

.course-card {
  display: flex;
  flex-direction: column;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  text-decoration: none;
  color: inherit;
  transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
  position: relative;
}

.course-card:hover {
  transform: translateY(-3px);
  border-color: rgba(0, 229, 153, 0.25);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.course-card.featured {
  border-color: rgba(0, 229, 153, 0.2);
}

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

.course-cat-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-glow);
  border: 1px solid rgba(0, 229, 153, 0.2);
  padding: 4px 10px;
  border-radius: 100px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.featured-badge {
  font-size: 0.7rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--accent-secondary);
  background: rgba(124, 92, 255, 0.1);
  border: 1px solid rgba(124, 92, 255, 0.25);
  padding: 3px 8px;
  border-radius: 100px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.course-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}

.course-card-tagline {
  font-size: 0.875rem;
  color: var(--fg-secondary);
  line-height: 1.6;
  flex: 1;
  margin-bottom: 20px;
}

.course-card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-bottom: 20px;
}

.level-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 100px;
}

.level-badge.level-beginner {
  color: #28c840;
  background: rgba(40, 200, 64, 0.1);
  border: 1px solid rgba(40, 200, 64, 0.25);
}

.level-badge.level-intermediate {
  color: #febc2e;
  background: rgba(254, 188, 46, 0.1);
  border: 1px solid rgba(254, 188, 46, 0.25);
}

.level-badge.level-advanced {
  color: #ff5f57;
  background: rgba(255, 95, 87, 0.1);
  border: 1px solid rgba(255, 95, 87, 0.25);
}

.meta-item {
  font-size: 0.8rem;
  color: var(--fg-dim);
  font-family: var(--font-mono);
}

.course-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border);
  padding-top: 16px;
  margin-top: auto;
}

.course-price {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--fg-primary);
}

.price-free {
  color: var(--accent);
}

.course-cta {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  font-weight: 600;
}

.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 60px 24px;
}

/* ── Course detail ────────────────────────────────────────────────────────── */
.detail-hero {
  padding: 60px 24px 48px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.detail-hero-inner {
  max-width: 1100px;
  margin: 0 auto;
}

.detail-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--fg-dim);
  margin-bottom: 32px;
}

.detail-breadcrumb a {
  color: var(--fg-secondary);
  text-decoration: none;
  transition: color 0.2s;
}

.detail-breadcrumb a:hover {
  color: var(--accent);
}

.breadcrumb-sep {
  opacity: 0.4;
}

.detail-hero-content {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 48px;
  align-items: start;
}

.detail-title {
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
}

.detail-tagline {
  font-size: 1.1rem;
  color: var(--fg-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
}

.detail-meta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

/* Enroll card */
.enroll-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  position: sticky;
  top: 80px;
}

.enroll-price {
  margin-bottom: 20px;
}

.price-amount {
  font-family: var(--font-mono);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--fg-primary);
}

.price-free-lg {
  font-family: var(--font-mono);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--accent);
}

.enroll-btn {
  display: block;
  width: 100%;
  background: var(--accent);
  color: #000;
  padding: 14px;
  border: none;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 700;
  font-family: var(--font-mono);
  cursor: pointer;
  text-align: center;
  transition: opacity 0.2s, transform 0.15s;
}

.enroll-btn:hover {
  opacity: 0.85;
  transform: translateY(-1px);
}

.enroll-note {
  font-size: 0.8rem;
  color: var(--fg-dim);
  text-align: center;
  margin-top: 12px;
}

.enroll-includes {
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

.includes-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--fg-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 10px;
  font-family: var(--font-mono);
}

.includes-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.includes-list li {
  font-size: 0.875rem;
  color: var(--fg-secondary);
  padding-left: 12px;
  position: relative;
}

.includes-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-size: 0.75rem;
}

/* Detail sections */
.detail-section {
  padding: 56px 24px;
  border-bottom: 1px solid var(--border);
}

.detail-section-inner {
  max-width: 1100px;
  margin: 0 auto;
}

.section-heading {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
}

.detail-description {
  font-size: 1rem;
  color: var(--fg-secondary);
  line-height: 1.8;
  max-width: 680px;
}

/* Curriculum */
.curriculum-meta {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--fg-dim);
  margin-bottom: 24px;
}

.curriculum-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-width: 760px;
}

.module-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.module-item[open] {
  border-color: rgba(0, 229, 153, 0.15);
}

.module-summary {
  cursor: pointer;
  list-style: none;
  padding: 0;
}

.module-summary::-webkit-details-marker {
  display: none;
}

.module-summary-inner {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 18px 20px;
  transition: background 0.15s;
}

.module-summary:hover .module-summary-inner {
  background: rgba(255, 255, 255, 0.02);
}

.module-number {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent);
  min-width: 28px;
}

.module-title {
  flex: 1;
  font-weight: 600;
  font-size: 0.95rem;
}

.module-count {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--fg-dim);
}

.module-chevron {
  font-size: 1.1rem;
  color: var(--fg-dim);
  transition: transform 0.2s;
  font-family: var(--font-mono);
}

.module-desc {
  font-size: 0.875rem;
  color: var(--fg-secondary);
  padding: 0 20px 16px 60px;
  line-height: 1.6;
}

.lessons-list {
  list-style: none;
  border-top: 1px solid var(--border);
}

.lesson-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 20px;
  border-bottom: 1px solid var(--border);
  transition: background 0.15s;
}

.lesson-item:last-child {
  border-bottom: none;
}

.lesson-item:hover {
  background: rgba(255, 255, 255, 0.02);
}

.lesson-icon {
  font-size: 0.75rem;
  width: 24px;
  text-align: center;
}

.lesson-title {
  flex: 1;
  font-size: 0.875rem;
  color: var(--fg-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.preview-badge {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--accent);
  background: var(--accent-glow);
  border: 1px solid rgba(0, 229, 153, 0.2);
  padding: 2px 7px;
  border-radius: 100px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.lesson-duration {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--fg-dim);
}

/* Bottom CTA */
.detail-cta-section {
  padding: 80px 24px;
  text-align: center;
}

.detail-cta-inner {
  max-width: 480px;
  margin: 0 auto;
}

.detail-cta-inner h2 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.detail-cta-inner p {
  color: var(--fg-secondary);
  line-height: 1.6;
}

/* ── Error page ───────────────────────────────────────────────────────────── */
.error-page {
  padding: 100px 24px;
  text-align: center;
}

/* ── Admin styles ─────────────────────────────────────────────────────────── */
.admin-login-wrap {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 24px;
  background: var(--bg-primary);
}

.admin-login-form {
  width: 100%;
  max-width: 360px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 24px;
}

.admin-wrap {
  min-height: 100vh;
  background: var(--bg-primary);
}

.admin-header {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: 14px 24px;
}

.admin-header-inner {
  display: flex;
  align-items: center;
  gap: 10px;
  max-width: 1100px;
  margin: 0 auto;
}

.admin-nav-link {
  color: var(--fg-secondary);
  font-size: 0.85rem;
  text-decoration: none;
  font-family: var(--font-mono);
  transition: color 0.2s;
}

.admin-nav-link:hover {
  color: var(--fg-primary);
}

.admin-main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 40px 24px 80px;
}

.admin-flash {
  background: var(--accent-glow);
  border: 1px solid rgba(0, 229, 153, 0.3);
  color: var(--accent);
  padding: 12px 16px;
  border-radius: 8px;
  font-size: 0.875rem;
  font-family: var(--font-mono);
  margin-bottom: 24px;
}

.admin-flash.error {
  background: rgba(255, 95, 87, 0.1);
  border-color: rgba(255, 95, 87, 0.3);
  color: #ff5f57;
}

.admin-section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 28px;
}

.admin-page-title {
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.admin-empty {
  color: var(--fg-dim);
  font-size: 0.95rem;
}

.admin-empty a {
  color: var(--accent);
}

.admin-table-wrap {
  overflow-x: auto;
}

.admin-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.admin-table th {
  text-align: left;
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--fg-dim);
  border-bottom: 1px solid var(--border);
}

.admin-table td {
  padding: 14px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
  color: var(--fg-secondary);
}

.admin-table tr:hover td {
  background: rgba(255, 255, 255, 0.02);
}

.admin-course-title a {
  color: var(--fg-primary);
  text-decoration: none;
  font-weight: 500;
}

.admin-course-title a:hover {
  color: var(--accent);
}

.status-pill {
  display: inline-flex;
  padding: 3px 10px;
  border-radius: 100px;
  font-size: 0.7rem;
  font-weight: 700;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-right: 4px;
}

.status-pill.published {
  color: #28c840;
  background: rgba(40, 200, 64, 0.1);
  border: 1px solid rgba(40, 200, 64, 0.25);
}

.status-pill.draft {
  color: var(--fg-dim);
  background: rgba(85, 85, 106, 0.1);
  border: 1px solid var(--border);
}

.status-pill.featured-pill {
  color: var(--accent-secondary);
  background: rgba(124, 92, 255, 0.1);
  border: 1px solid rgba(124, 92, 255, 0.25);
}

.admin-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  white-space: nowrap;
}

.admin-action-link {
  color: var(--accent);
  font-size: 0.8rem;
  text-decoration: none;
  font-family: var(--font-mono);
  font-weight: 600;
}

.admin-action-link:hover {
  text-decoration: underline;
}

.admin-delete-btn {
  background: transparent;
  border: 1px solid rgba(255, 95, 87, 0.3);
  color: #ff5f57;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  padding: 3px 10px;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.2s;
}

.admin-delete-btn:hover {
  background: rgba(255, 95, 87, 0.1);
}

/* Admin forms */
.admin-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
  max-width: 680px;
}

.form-row {
  display: flex;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
}

.form-label {
  font-size: 0.8rem;
  font-weight: 600;
  font-family: var(--font-mono);
  color: var(--fg-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.required {
  color: #ff5f57;
}

.form-input {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 14px;
  color: var(--fg-primary);
  font-family: var(--font-body);
  font-size: 0.9rem;
  transition: border-color 0.2s;
  width: 100%;
}

.form-input:focus {
  outline: none;
  border-color: var(--accent);
}

.form-input::placeholder {
  color: var(--fg-dim);
}

.form-textarea {
  resize: vertical;
  min-height: 100px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.6;
}

select.form-input {
  cursor: pointer;
}

.form-hint {
  font-size: 0.75rem;
  color: var(--fg-dim);
  font-family: var(--font-mono);
}

.form-checkbox {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 0.875rem;
  color: var(--fg-secondary);
}

.form-checkbox input {
  accent-color: var(--accent);
  width: 16px;
  height: 16px;
  cursor: pointer;
}

.form-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  padding-top: 8px;
}

/* Module/lesson management in structure view */
.admin-module-block {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 16px;
  overflow: hidden;
}

.admin-module-header {
  display: flex;
  align-items: center;
  padding: 16px 20px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  gap: 8px;
}

.admin-lesson-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 20px;
  border-bottom: 1px solid var(--border);
  font-size: 0.875rem;
}

.admin-lesson-row:last-of-type {
  border-bottom: none;
}

.admin-add-form {
  border-top: 1px solid var(--border);
}

.admin-add-toggle {
  cursor: pointer;
  list-style: none;
  padding: 10px 20px;
  font-size: 0.8rem;
  font-family: var(--font-mono);
  color: var(--accent);
  font-weight: 600;
  transition: background 0.15s;
}

.admin-add-toggle:hover {
  background: rgba(255, 255, 255, 0.02);
}

.admin-add-toggle::-webkit-details-marker {
  display: none;
}

.admin-inline-form {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 14px 20px 16px;
  border-top: 1px solid var(--border);
}

.admin-add-module-section {
  margin-top: 40px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}

.admin-section-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 20px;
  letter-spacing: -0.01em;
}

/* ── Responsive ───────────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .detail-hero-content {
    grid-template-columns: 1fr;
  }

  .enroll-card {
    position: static;
  }

  .form-row {
    flex-direction: column;
  }

  .nav-link {
    display: none;
  }

  .courses-grid {
    grid-template-columns: 1fr;
  }

  .admin-table th:nth-child(3),
  .admin-table td:nth-child(3) {
    display: none;
  }
}