/* ---- APP NAV ---- */
.app-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  height: 60px;
  background: rgba(10, 10, 12, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.nav-brand {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--fg-primary);
  text-decoration: none;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

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

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

.btn-accent-sm {
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--bg-primary);
  background: var(--accent);
  border-radius: 8px;
  padding: 0.45rem 1rem;
  text-decoration: none;
  transition: background 0.2s;
}

.btn-accent-sm:hover {
  background: var(--accent-dim);
}

/* ---- VIEWS ---- */
.view {
  min-height: 100vh;
  padding-top: 60px;
  position: relative;
  overflow: hidden;
}

/* ---- BUILDER VIEW ---- */
.builder-container {
  max-width: 760px;
  margin: 0 auto;
  padding: 5rem 2rem 4rem;
  position: relative;
  z-index: 2;
}

.builder-header {
  text-align: center;
  margin-bottom: 3rem;
}

.builder-header h1 {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
  margin-top: 1.5rem;
}

.builder-sub {
  font-size: 1.05rem;
  color: var(--fg-secondary);
  max-width: 540px;
  margin: 0 auto;
  line-height: 1.7;
}

.input-card {
  background: var(--bg-card);
  border: 1px solid rgba(255,255,255,0.07);
  border-radius: var(--radius);
  padding: 2rem;
}

.input-label {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--fg-primary);
  margin-bottom: 0.75rem;
}

.input-hint {
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 400;
  color: var(--fg-muted);
}

.expertise-textarea {
  width: 100%;
  background: var(--bg-secondary);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 8px;
  color: var(--fg-primary);
  font-family: var(--font-body);
  font-size: 0.95rem;
  line-height: 1.7;
  padding: 1rem 1.25rem;
  resize: vertical;
  transition: border-color 0.2s;
  outline: none;
}

.expertise-textarea:focus {
  border-color: var(--accent-dim);
}

.expertise-textarea::placeholder {
  color: var(--fg-muted);
}

.char-count {
  text-align: right;
  font-size: 0.78rem;
  color: var(--fg-muted);
  margin-top: 0.4rem;
  margin-bottom: 1rem;
}

.form-error {
  background: rgba(232, 84, 84, 0.1);
  border: 1px solid rgba(232, 84, 84, 0.3);
  border-radius: 8px;
  color: var(--negative);
  font-size: 0.88rem;
  padding: 0.7rem 1rem;
  margin-bottom: 1rem;
}

.btn-generate {
  width: 100%;
  background: var(--accent);
  color: var(--bg-primary);
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  border: none;
  border-radius: 10px;
  padding: 1rem 2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  transition: background 0.2s, transform 0.1s;
}

.btn-generate:hover {
  background: var(--accent-dim);
}

.btn-generate:active {
  transform: scale(0.99);
}

.btn-generate:disabled {
  background: var(--fg-muted);
  cursor: not-allowed;
  transform: none;
}

.btn-icon {
  font-size: 1.1rem;
}

/* ---- GENERATING VIEW ---- */
.generating-container {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 60px);
  padding: 4rem 2rem;
  position: relative;
  z-index: 2;
}

.generating-inner {
  max-width: 480px;
  text-align: center;
}

.generating-orb {
  width: 80px;
  height: 80px;
  margin: 0 auto 2rem;
  border-radius: 50%;
  background: radial-gradient(circle, var(--accent) 0%, var(--accent-dim) 60%, transparent 100%);
  animation: pulse 2s ease-in-out infinite;
  box-shadow: 0 0 40px var(--accent-glow);
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.1); opacity: 0.8; }
}

.generating-inner h2 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}

.generating-sub {
  font-size: 0.95rem;
  color: var(--fg-secondary);
  line-height: 1.65;
  margin-bottom: 2.5rem;
}

.progress-steps {
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.progress-step {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  font-size: 0.9rem;
  color: var(--fg-muted);
  transition: color 0.4s;
}

.progress-step.active {
  color: var(--fg-primary);
}

.progress-step.done {
  color: var(--positive);
}

.step-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--fg-muted);
  flex-shrink: 0;
  transition: background 0.4s;
}

.progress-step.active .step-dot {
  background: var(--accent);
  box-shadow: 0 0 6px var(--accent-glow);
  animation: blink 1s ease-in-out infinite;
}

.progress-step.done .step-dot {
  background: var(--positive);
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* ---- PREVIEW VIEW ---- */
.preview-container {
  max-width: 900px;
  margin: 0 auto;
  padding: 3rem 2rem 5rem;
  position: relative;
  z-index: 2;
}

.preview-header {
  margin-bottom: 3rem;
}

.preview-status {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

.status-badge {
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  border: 1px solid var(--accent-dim);
  border-radius: 100px;
  padding: 0.3rem 0.9rem;
}

.btn-back {
  background: none;
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 8px;
  color: var(--fg-secondary);
  font-size: 0.85rem;
  padding: 0.4rem 0.9rem;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
}

.btn-back:hover {
  border-color: rgba(255,255,255,0.25);
  color: var(--fg-primary);
}

.preview-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: 0.75rem;
}

.preview-tagline {
  font-size: 1.05rem;
  color: var(--fg-secondary);
  margin-bottom: 1.5rem;
  max-width: 620px;
}

.preview-meta {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.meta-chip {
  font-size: 0.82rem;
  color: var(--fg-secondary);
  background: var(--bg-card);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 100px;
  padding: 0.3rem 0.9rem;
}

/* ---- TABS ---- */
.preview-tabs {
  display: flex;
  gap: 0.5rem;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  margin-bottom: 2.5rem;
}

.tab {
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  padding: 0.75rem 1.25rem;
  font-family: var(--font-display);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--fg-muted);
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
  margin-bottom: -1px;
}

.tab:hover {
  color: var(--fg-secondary);
}

.tab.active {
  color: var(--fg-primary);
  border-bottom-color: var(--accent);
}

/* ---- CURRICULUM TREE ---- */
.curriculum-tree {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.module-block {
  background: var(--bg-card);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius);
  overflow: hidden;
}

.module-header {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.5rem;
  cursor: pointer;
  transition: background 0.2s;
  user-select: none;
}

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

.module-num {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.08em;
  min-width: 36px;
  padding-top: 0.15rem;
}

.module-info {
  flex: 1;
}

.module-title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.3rem;
}

.module-desc {
  font-size: 0.88rem;
  color: var(--fg-secondary);
  line-height: 1.55;
}

.module-toggle {
  font-size: 1rem;
  color: var(--fg-muted);
  transition: transform 0.2s;
  padding-top: 0.1rem;
}

.module-block.open .module-toggle {
  transform: rotate(90deg);
}

.module-lessons {
  border-top: 1px solid rgba(255,255,255,0.04);
  display: none;
}

.module-block.open .module-lessons {
  display: block;
}

.lesson-item {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid rgba(255,255,255,0.04);
}

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

.lesson-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
  cursor: pointer;
}

.lesson-num {
  font-family: var(--font-display);
  font-size: 0.72rem;
  color: var(--fg-muted);
  min-width: 28px;
}

.lesson-title {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
}

.lesson-type-badge {
  font-size: 0.7rem;
  color: var(--fg-muted);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 4px;
  padding: 0.1rem 0.5rem;
  margin-left: auto;
}

.lesson-content-block {
  display: none;
  padding-left: 1.1rem;
  border-left: 2px solid rgba(255,255,255,0.06);
  margin-left: 0.5rem;
  margin-top: 0.75rem;
}

.lesson-content-block.expanded {
  display: block;
}

.lesson-content-text {
  font-size: 0.9rem;
  color: var(--fg-secondary);
  line-height: 1.7;
  white-space: pre-wrap;
  margin-bottom: 1.25rem;
}

.quiz-block {
  background: var(--bg-secondary);
  border-radius: 8px;
  padding: 1rem 1.25rem;
}

.quiz-label {
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.quiz-question {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--fg-primary);
  margin-bottom: 0.6rem;
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 0.75rem;
}

.quiz-option {
  font-size: 0.85rem;
  color: var(--fg-secondary);
  padding: 0.4rem 0.75rem;
  border-radius: 6px;
  border: 1px solid rgba(255,255,255,0.05);
}

.quiz-option.correct {
  color: var(--positive);
  border-color: rgba(76, 232, 154, 0.25);
  background: rgba(76, 232, 154, 0.06);
}

.quiz-explanation {
  font-size: 0.82rem;
  color: var(--fg-muted);
  font-style: italic;
}

/* ---- SALES PAGE PREVIEW ---- */
.sales-preview {
  max-width: 680px;
}

.sales-headline {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--fg-primary);
  margin-bottom: 2rem;
}

.sales-body {
  font-size: 1rem;
  color: var(--fg-secondary);
  line-height: 1.8;
  white-space: pre-wrap;
}

/* ---- ABOUT ---- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.about-card {
  background: var(--bg-card);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius);
  padding: 1.75rem;
}

.about-card h4 {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.about-card p {
  font-size: 0.92rem;
  color: var(--fg-secondary);
  line-height: 1.7;
}

/* ---- COURSES LIST ---- */
.courses-container {
  max-width: 960px;
  margin: 0 auto;
  padding: 5rem 2rem 4rem;
}

.courses-header {
  margin-bottom: 3rem;
}

.courses-header h1 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}

.courses-sub {
  font-size: 1rem;
  color: var(--fg-secondary);
}

.courses-loading {
  color: var(--fg-muted);
  font-size: 0.95rem;
  padding: 3rem 0;
  text-align: center;
}

.courses-empty {
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  padding: 5rem 0;
  text-align: center;
  color: var(--fg-secondary);
}

.btn-accent {
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--bg-primary);
  background: var(--accent);
  border-radius: 10px;
  padding: 0.75rem 1.75rem;
  text-decoration: none;
  display: inline-block;
  transition: background 0.2s;
}

.btn-accent:hover {
  background: var(--accent-dim);
}

.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}

.course-card {
  background: var(--bg-card);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-decoration: none;
  color: var(--fg-primary);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: border-color 0.2s, transform 0.15s;
}

.course-card:hover {
  border-color: var(--accent-dim);
  transform: translateY(-2px);
}

.course-card-header {
  display: flex;
  justify-content: flex-end;
}

.course-status-badge {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border-radius: 100px;
  padding: 0.2rem 0.6rem;
  border: 1px solid;
}

.course-status-badge.draft {
  color: var(--fg-muted);
  border-color: var(--fg-muted);
}

.course-status-badge.published {
  color: var(--positive);
  border-color: var(--positive);
}

.course-card-title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.3;
}

.course-card-tagline {
  font-size: 0.87rem;
  color: var(--fg-secondary);
  line-height: 1.55;
  flex: 1;
}

.course-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 0.5rem;
  border-top: 1px solid rgba(255,255,255,0.04);
}

.course-date {
  font-size: 0.78rem;
  color: var(--fg-muted);
}

.course-arrow {
  color: var(--accent);
  font-size: 0.95rem;
}

/* ---- LANDING PAGE CTA BUTTON ---- */
.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--accent);
  color: var(--bg-primary);
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  border-radius: 10px;
  padding: 0.85rem 2rem;
  text-decoration: none;
  margin-top: 2.5rem;
  transition: background 0.2s;
}

.hero-cta:hover {
  background: var(--accent-dim);
}

/* ---- RESPONSIVE ---- */
@media (max-width: 640px) {
  .about-grid {
    grid-template-columns: 1fr;
  }

  .preview-tabs {
    overflow-x: auto;
  }

  .generating-inner h2 {
    font-size: 1.5rem;
  }
}