/* SurferX Learn Hub — Course system (cards, modal, quiz, lessons) */

.sx-course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

.sx-course-card {
  position: relative;
  background: linear-gradient(145deg, rgba(12, 28, 44, 0.92), rgba(7, 18, 30, 0.88));
  border: 1px solid rgba(29, 233, 255, 0.14);
  border-radius: var(--r, 18px);
  padding: 22px 20px 18px;
  overflow: hidden;
  transition: transform 0.22s ease, border-color 0.22s ease, box-shadow 0.22s ease;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 100%;
}

.sx-course-card:hover {
  transform: translateY(-4px);
  border-color: rgba(29, 233, 255, 0.35);
  box-shadow: 0 12px 40px rgba(29, 233, 255, 0.08);
}

.sx-cc-glow {
  position: absolute;
  top: -40%;
  right: -30%;
  width: 180px;
  height: 180px;
  background: radial-gradient(circle, rgba(29, 233, 255, 0.12), transparent 70%);
  pointer-events: none;
}

.sx-cc-badge {
  display: inline-flex;
  align-self: flex-start;
  font-family: 'Space Mono', monospace;
  font-size: 0.58rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 3px 9px;
  border-radius: 999px;
  border: 1px solid;
}

.sx-cc-badge.level-beginner {
  color: var(--mint, #34d399);
  border-color: rgba(52, 211, 153, 0.35);
  background: rgba(52, 211, 153, 0.08);
}

.sx-cc-badge.level-essential {
  color: var(--cyan, #1de9ff);
  border-color: rgba(29, 233, 255, 0.3);
  background: rgba(29, 233, 255, 0.08);
}

.sx-cc-badge.level-advanced {
  color: var(--gold, #f5c842);
  border-color: rgba(245, 200, 66, 0.35);
  background: rgba(245, 200, 66, 0.08);
}

.sx-cc-badge.level-developer {
  color: var(--lav, #a77aff);
  border-color: rgba(167, 122, 255, 0.35);
  background: rgba(167, 122, 255, 0.08);
}

.sx-cc-num {
  font-family: 'Space Mono', monospace;
  font-size: 0.62rem;
  color: var(--cyan, #1de9ff);
  letter-spacing: 0.12em;
  opacity: 0.85;
}

.sx-cc-title {
  font-family: 'Syne', sans-serif;
  font-size: 1.05rem;
  font-weight: 700;
  margin: 0;
  line-height: 1.25;
}

.sx-cc-sub {
  font-size: 0.78rem;
  color: var(--muted, #8fb7c8);
  margin: 0;
  line-height: 1.45;
}

.sx-cc-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 10px;
  margin: 4px 0;
}

.sx-cc-meta-item {
  font-size: 0.7rem;
  color: var(--fog, #c4d9e2);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.06);
  padding: 3px 8px;
  border-radius: 8px;
}

.sx-cc-meta-item.quiz {
  color: var(--mint, #34d399);
  border-color: rgba(52, 211, 153, 0.2);
}

.sx-cc-meta-item.no-quiz {
  color: var(--teal, #0fa8c9);
}

.sx-cc-status-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  flex-wrap: wrap;
}

.sx-cc-status {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 4px 10px;
  border-radius: 999px;
}

.sx-cc-status.not-started {
  color: var(--muted);
  background: rgba(143, 183, 200, 0.1);
  border: 1px solid rgba(143, 183, 200, 0.2);
}

.sx-cc-status.in-progress {
  color: var(--cyan);
  background: rgba(29, 233, 255, 0.1);
  border: 1px solid rgba(29, 233, 255, 0.25);
}

.sx-cc-status.completed {
  color: var(--mint);
  background: rgba(52, 211, 153, 0.12);
  border: 1px solid rgba(52, 211, 153, 0.28);
}

.sx-cc-xp {
  font-size: 0.62rem;
  color: var(--gold, #f5c842);
  opacity: 0.75;
  font-style: italic;
}

.sx-course-btn {
  font-family: 'Syne', sans-serif;
  font-weight: 700;
  font-size: 0.78rem;
  padding: 10px 18px;
  border-radius: 999px;
  border: 1px solid rgba(29, 233, 255, 0.25);
  background: rgba(29, 233, 255, 0.06);
  color: var(--fog, #eaffff);
  cursor: pointer;
  transition: all 0.2s ease;
}

.sx-course-btn:hover:not(:disabled) {
  border-color: var(--cyan);
  background: rgba(29, 233, 255, 0.14);
  color: var(--cyan);
}

.sx-course-btn.primary {
  background: linear-gradient(135deg, var(--teal, #0fa8c9), var(--cyan, #1de9ff));
  border: none;
  color: #041018;
}

.sx-course-btn.primary:hover:not(:disabled) {
  filter: brightness(1.08);
  color: #041018;
}

.sx-course-btn.ghost {
  background: transparent;
}

.sx-course-btn.sm {
  padding: 6px 12px;
  font-size: 0.72rem;
}

.sx-course-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.sx-cc-cta {
  width: 100%;
  margin-top: auto;
}

/* Progress bar */
.sx-prog {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.sx-prog--compact {
  margin: 4px 0;
}

.sx-prog-track {
  height: 5px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 999px;
  overflow: hidden;
}

.sx-prog-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--teal), var(--cyan));
  border-radius: 999px;
  transition: width 0.35s ease;
}

.sx-prog-label {
  font-size: 0.65rem;
  color: var(--muted);
  font-family: 'Space Mono', monospace;
}

/* Modal overlay */
.sx-course-overlay {
  position: fixed;
  inset: 0;
  z-index: 12000;
  background: rgba(2, 8, 16, 0.88);
  backdrop-filter: blur(8px);
  display: none;
  align-items: flex-end;
  justify-content: center;
  padding: 0;
}

.sx-course-overlay.open {
  display: flex;
}

.sx-course-panel {
  position: relative;
  width: min(720px, 100%);
  max-height: 92vh;
  overflow-y: auto;
  background: linear-gradient(180deg, #0a1a2a 0%, #061018 100%);
  border: 1px solid rgba(29, 233, 255, 0.22);
  border-radius: 20px 20px 0 0;
  box-shadow: 0 -8px 60px rgba(0, 0, 0, 0.5);
  animation: sxDrawerUp 0.32s ease;
}

@media (min-width: 768px) {
  .sx-course-overlay {
    align-items: center;
    padding: 24px;
  }

  .sx-course-panel {
    border-radius: 20px;
    max-height: 88vh;
  }
}

@keyframes sxDrawerUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.sx-course-close {
  position: absolute;
  top: 12px;
  right: 12px;
  z-index: 5;
  width: 36px;
  height: 36px;
  border: none;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.45);
  color: var(--fog);
  font-size: 1.4rem;
  cursor: pointer;
  line-height: 1;
}

.sx-course-close:hover {
  background: rgba(255, 107, 91, 0.25);
  color: #ff6b7a;
}

.sx-course-hero {
  min-height: 160px;
  padding: 28px 24px 24px;
  background:
    linear-gradient(135deg, rgba(15, 168, 201, 0.25), rgba(29, 233, 255, 0.08)),
    repeating-linear-gradient(
      -45deg,
      rgba(255, 255, 255, 0.03),
      rgba(255, 255, 255, 0.03) 2px,
      transparent 2px,
      transparent 8px
    );
  border-bottom: 1px solid rgba(29, 233, 255, 0.15);
}

.sx-course-hero--violet {
  background: linear-gradient(135deg, rgba(167, 122, 255, 0.22), rgba(29, 233, 255, 0.06));
}

.sx-course-hero--gold {
  background: linear-gradient(135deg, rgba(245, 200, 66, 0.18), rgba(29, 233, 255, 0.06));
}

.sx-course-hero-badge {
  display: inline-block;
  font-size: 0.62rem;
  font-family: 'Space Mono', monospace;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 10px;
  opacity: 0.9;
}

.sx-course-hero h2 {
  font-family: 'Syne', sans-serif;
  font-size: 1.45rem;
  margin: 0 0 6px;
}

.sx-course-hero p {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.sx-course-body {
  padding: 20px 24px 28px;
}

.sx-course-meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 14px;
  align-items: center;
  font-size: 0.75rem;
  color: var(--muted);
  margin-bottom: 12px;
}

.sx-course-desc {
  font-size: 0.88rem;
  color: var(--fog);
  line-height: 1.6;
  margin: 14px 0;
}

.sx-course-future-note {
  font-size: 0.78rem;
  color: var(--gold);
  background: rgba(245, 200, 66, 0.08);
  border: 1px solid rgba(245, 200, 66, 0.2);
  padding: 10px 12px;
  border-radius: 10px;
  margin-bottom: 16px;
}

.sx-course-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 20px;
}

.sx-course-section-title {
  font-family: 'Syne', sans-serif;
  font-size: 0.95rem;
  margin: 0 0 12px;
}

.sx-lesson-list {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.sx-lesson-list li button {
  width: 100%;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  text-align: left;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  background: rgba(255, 255, 255, 0.03);
  color: inherit;
  cursor: pointer;
  transition: border-color 0.2s;
}

.sx-lesson-list li button:hover {
  border-color: rgba(29, 233, 255, 0.3);
}

.sx-lesson-list li.done button {
  border-color: rgba(52, 211, 153, 0.25);
}

.sx-lesson-ico {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: rgba(29, 233, 255, 0.1);
  display: grid;
  place-items: center;
  font-size: 0.75rem;
  flex-shrink: 0;
}

.sx-lesson-list li.done .sx-lesson-ico {
  background: rgba(52, 211, 153, 0.15);
  color: var(--mint);
}

.sx-lesson-list strong {
  display: block;
  font-size: 0.85rem;
}

.sx-lesson-list small {
  display: block;
  color: var(--muted);
  font-size: 0.72rem;
  margin-top: 2px;
}

.sx-related-links {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.sx-related-links h4 {
  font-size: 0.82rem;
  margin: 0 0 10px;
  color: var(--muted);
}

.sx-related-link {
  display: inline-flex;
  margin: 0 8px 8px 0;
  font-size: 0.74rem;
  color: var(--teal);
  background: rgba(15, 168, 201, 0.08);
  border: 1px solid rgba(15, 168, 201, 0.22);
  padding: 6px 12px;
  border-radius: 999px;
  cursor: pointer;
}

.sx-related-link:hover {
  color: var(--cyan);
  border-color: var(--cyan);
}

/* Lesson viewer */
.sx-lesson-view {
  padding: 20px 24px 28px;
}

.sx-lesson-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.sx-lesson-back {
  background: none;
  border: none;
  color: var(--cyan);
  font-family: 'Syne', sans-serif;
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
  padding: 0;
}

.sx-lesson-counter {
  font-size: 0.72rem;
  color: var(--muted);
  font-family: 'Space Mono', monospace;
}

.sx-lesson-title {
  font-family: 'Syne', sans-serif;
  font-size: 1.2rem;
  margin: 12px 0 6px;
}

.sx-lesson-short {
  color: var(--muted);
  font-size: 0.85rem;
  margin: 0 0 14px;
}

.sx-lesson-body {
  font-size: 0.88rem;
  line-height: 1.65;
  color: var(--fog);
}

.sx-lesson-body p {
  margin: 0 0 12px;
}

.sx-lesson-media {
  margin: 14px 0;
  border-radius: 14px;
  border: 1px dashed rgba(29, 233, 255, 0.2);
  background: rgba(0, 0, 0, 0.25);
  overflow: hidden;
}

.sx-lesson-media.hidden-video {
  display: none;
}

.sx-lesson-media-inner {
  padding: 16px;
  text-align: center;
}

.sx-lesson-media-badge {
  display: inline-block;
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--cyan);
  margin-bottom: 8px;
}

.sx-interactive-slot {
  margin-top: 10px;
  padding: 20px;
  border-radius: 10px;
  background: rgba(167, 122, 255, 0.08);
  border: 1px solid rgba(167, 122, 255, 0.2);
  font-size: 0.8rem;
  color: var(--muted);
}

.sx-lesson-glossary {
  margin-top: 14px;
  font-size: 0.78rem;
}

.sx-lesson-glo-link {
  color: var(--teal);
  margin-right: 8px;
}

.sx-lesson-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.sx-lesson-done-pill {
  font-size: 0.75rem;
  color: var(--mint);
  font-weight: 700;
}

/* Quiz */
.sx-quiz-wrap {
  padding: 20px 24px 28px;
}

.sx-quiz-head h4 {
  font-family: 'Syne', sans-serif;
  margin: 0 0 4px;
}

.sx-quiz-meta {
  font-size: 0.75rem;
  color: var(--muted);
  margin: 0 0 16px;
}

.sx-quiz-q {
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  padding: 14px;
  margin: 0 0 12px;
}

.sx-quiz-q legend {
  font-size: 0.88rem;
  font-weight: 600;
  padding: 0 4px;
  margin-bottom: 8px;
}

.sx-quiz-opt {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 8px 4px;
  font-size: 0.84rem;
  cursor: pointer;
}

.sx-quiz-results.passed h4 {
  color: var(--mint);
}

.sx-quiz-results.failed h4 {
  color: var(--gold);
}

.sx-quiz-score {
  font-family: 'Space Mono', monospace;
  font-size: 0.9rem;
  margin-bottom: 16px;
}

.sx-quiz-review {
  font-size: 0.82rem;
  padding: 10px 12px;
  border-radius: 10px;
  margin-bottom: 8px;
}

.sx-quiz-review.ok {
  background: rgba(52, 211, 153, 0.08);
  border: 1px solid rgba(52, 211, 153, 0.2);
}

.sx-quiz-review.bad {
  background: rgba(255, 107, 91, 0.08);
  border: 1px solid rgba(255, 107, 91, 0.2);
}

.sx-quiz-pass-badge {
  font-size: 0.75rem;
  color: var(--mint);
  align-self: center;
}

.sx-quiz-actions {
  display: flex;
  gap: 10px;
  margin-top: 16px;
  flex-wrap: wrap;
}

/* Knowledge checks */
.sx-knowledge {
  margin: 16px 0;
  padding: 14px;
  border-radius: 12px;
  background: rgba(15, 168, 201, 0.06);
  border: 1px solid rgba(15, 168, 201, 0.15);
}

.sx-knowledge-sub {
  font-size: 0.78rem;
  color: var(--muted);
  margin: 0 0 12px;
}

.sx-kc-item {
  margin-bottom: 14px;
  font-size: 0.82rem;
}

.sx-kc-item ul {
  margin: 6px 0;
  padding-left: 18px;
  color: var(--muted);
}

.sx-kc-answer {
  display: none;
  margin-top: 8px;
  padding: 10px;
  background: rgba(52, 211, 153, 0.08);
  border-radius: 8px;
  font-size: 0.78rem;
}

.sx-kc-answer.open {
  display: block;
}

.sx-path-empty {
  color: var(--muted);
  grid-column: 1 / -1;
}

@media (max-width: 600px) {
  .sx-course-card {
    padding: 18px 16px;
  }

  .sx-course-body,
  .sx-lesson-view,
  .sx-quiz-wrap {
    padding-left: 16px;
    padding-right: 16px;
  }
}