/* ========================================
   COURSES.CSS — Course Player & Quiz
   GaDev.it
   ======================================== */

/* --- Course Catalog Cards --- */
.courses-section { position: relative; z-index: 1; }
.courses-catalog { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(340px, 100%), 1fr)); gap: 28px; }

.course-catalog-card {
    background: var(--surface-card); border: 1px solid var(--border-card);
    border-radius: var(--border-radius-lg); overflow: hidden;
    transition: all var(--transition-base); backdrop-filter: blur(10px);
}
.course-catalog-card:hover {
    transform: translateY(-6px); border-color: var(--border-card-hover);
    box-shadow: var(--shadow-glow-cyan);
}

.course-card-header {
    padding: 28px 28px 0; position: relative;
}
.course-card-badge {
    display: inline-block; padding: 4px 14px; border-radius: 50px;
    background: rgba(0,255,136,0.1); color: var(--accent-green);
    font-family: var(--font-code); font-size: 0.75rem; font-weight: 600;
    letter-spacing: 1px; text-transform: uppercase;
    border: 1px solid rgba(0,255,136,0.25); margin-bottom: 16px;
}
.course-card-title {
    font-family: var(--font-heading); font-size: 1.4rem; font-weight: 700;
    margin-bottom: 12px;
}
.course-card-meta {
    display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 16px;
}
.course-meta-item {
    display: flex; align-items: center; gap: 6px;
    font-size: 0.85rem; color: var(--text-secondary);
}
.course-meta-item svg, .course-meta-item i { width: 16px; height: 16px; color: var(--accent-cyan); }

.course-card-body { padding: 0 28px 28px; }
.course-card-desc { color: var(--text-secondary); font-size: 0.92rem; line-height: 1.7; margin-bottom: 20px; }
.course-card-chapters {
    display: flex; flex-direction: column; gap: 8px; margin-bottom: 24px;
}
.chapter-preview {
    display: flex; align-items: center; gap: 10px;
    padding: 10px 14px; background: rgba(0,240,255,0.03);
    border-radius: var(--border-radius-sm); font-size: 0.88rem; color: var(--text-secondary);
}
.chapter-preview svg, .chapter-preview i { width: 16px; height: 16px; color: var(--accent-violet); min-width: 16px; }

/* --- Course Player (Full-screen) --- */
.course-player {
    position: fixed; inset: 0; z-index: 2000; background: var(--bg-primary);
    display: none; flex-direction: column;
}
.course-player.active { display: flex; }

.player-topbar {
    height: 56px; display: flex; align-items: center; padding: 0 20px;
    background: var(--bg-secondary); border-bottom: 1px solid var(--border-card);
    gap: 16px; flex-shrink: 0;
}
.player-sidebar-toggle, .player-close {
    width: 40px; height: 40px; display: flex; align-items: center; justify-content: center;
    border-radius: var(--border-radius-sm); transition: all var(--transition-fast);
    color: var(--text-secondary);
}
.player-sidebar-toggle:hover, .player-close:hover {
    background: var(--surface-card); color: var(--accent-cyan);
}
.player-sidebar-toggle svg, .player-sidebar-toggle i,
.player-close svg, .player-close i { width: 22px; height: 22px; }

.player-course-title {
    flex: 1; font-family: var(--font-heading); font-size: 1.1rem;
    font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}

.player-body {
    flex: 1; display: grid; grid-template-columns: 300px 1fr;
    overflow: hidden;
}

/* Sidebar */
.player-sidebar {
    background: var(--bg-secondary); border-right: 1px solid var(--border-card);
    overflow-y: auto; display: flex; flex-direction: column;
}
/* Desktop: hide mobile-only sidebar elements */
.sidebar-close-header { display: none; }
.player-sidebar-overlay { display: none; }
.sidebar-progress { padding: 20px; border-bottom: 1px solid var(--border-card); }

.progress-bar {
    height: 6px; background: rgba(0,240,255,0.1); border-radius: 3px;
    overflow: hidden; margin-bottom: 8px;
}
.progress-fill {
    height: 100%; background: var(--gradient-primary); border-radius: 3px;
    width: 0%; transition: width var(--transition-base);
}
.progress-text { font-family: var(--font-code); font-size: 0.8rem; color: var(--text-muted); }

.sidebar-chapters { flex: 1; overflow-y: auto; padding: 12px; }

.chapter-group { margin-bottom: 8px; }
.chapter-header {
    width: 100%; display: flex; align-items: center; justify-content: space-between;
    padding: 12px 14px; border-radius: var(--border-radius-sm);
    font-family: var(--font-heading); font-size: 0.95rem; font-weight: 600;
    color: var(--text-primary); cursor: pointer; transition: all var(--transition-fast);
    background: transparent;
}
.chapter-header:hover { background: var(--surface-card); }
.chapter-header svg, .chapter-header i {
    width: 16px; height: 16px; transition: transform var(--transition-fast);
}
.chapter-group.expanded .chapter-header svg,
.chapter-group.expanded .chapter-header i { transform: rotate(180deg); }

.chapter-modules { display: none; padding: 4px 0 4px 12px; }
.chapter-group.expanded .chapter-modules { display: block; }

.module-item {
    display: flex; align-items: center; gap: 10px;
    padding: 10px 14px; border-radius: var(--border-radius-sm);
    font-size: 0.88rem; color: var(--text-secondary);
    cursor: pointer; transition: all var(--transition-fast);
}
.module-item:hover { background: var(--surface-card); color: var(--text-primary); }
.module-item.active { background: rgba(0,240,255,0.08); color: var(--accent-cyan); }
.module-item.completed { color: var(--accent-green); }
.module-item.locked { opacity: 0.4; cursor: not-allowed; }

.module-status {
    width: 20px; height: 20px; min-width: 20px; border-radius: 50%;
    border: 2px solid var(--text-muted); display: flex; align-items: center;
    justify-content: center; font-size: 10px; transition: all var(--transition-fast);
}
.module-item.active .module-status { border-color: var(--accent-cyan); background: var(--accent-cyan); color: var(--bg-primary); }
.module-item.completed .module-status { border-color: var(--accent-green); background: var(--accent-green); color: var(--bg-primary); }
.module-item.locked .module-status { border-color: var(--text-muted); }

/* Main Content */
.player-content {
    overflow-y: auto; padding: 40px 60px;
    max-width: 900px;
}

.module-header { margin-bottom: 32px; }
.module-number { font-family: var(--font-code); font-size: 0.85rem; color: var(--accent-cyan); display: block; margin-bottom: 6px; }
.module-title { font-family: var(--font-heading); font-size: 2rem; font-weight: 700; margin-bottom: 8px; }
.module-reading-time { color: var(--text-muted); font-size: 0.85rem; display: flex; align-items: center; gap: 6px; }
.module-reading-time svg, .module-reading-time i { width: 14px; height: 14px; }

.module-body { line-height: 1.9; color: var(--text-secondary); }
.module-body h3 { font-family: var(--font-heading); font-size: 1.4rem; font-weight: 600; color: var(--text-primary); margin: 32px 0 12px; }
.module-body p { margin-bottom: 16px; font-size: 1rem; }
.module-body ul, .module-body ol { margin: 12px 0 16px 24px; }
.module-body li { margin-bottom: 8px; }

.module-body .info-box, .module-body .warning-box {
    padding: 16px 20px; border-radius: var(--border-radius);
    margin: 20px 0; font-size: 0.92rem; line-height: 1.7;
}
.module-body .info-box {
    background: rgba(0,240,255,0.05); border-left: 3px solid var(--accent-cyan);
    color: var(--text-secondary);
}
.module-body .warning-box {
    background: rgba(255,184,108,0.05); border-left: 3px solid #FFB86C;
    color: var(--text-secondary);
}
.module-body .code-block {
    background: var(--bg-secondary); border: 1px solid var(--border-card);
    border-radius: var(--border-radius); padding: 16px 20px;
    font-family: var(--font-code); font-size: 0.88rem; overflow-x: auto;
    margin: 16px 0; line-height: 1.6; color: var(--accent-green);
}

.complete-module-btn {
    margin-top: 40px; display: flex; align-items: center; justify-content: center;
    gap: 8px; padding: 14px 32px; width: 100%;
    font-family: var(--font-heading); font-size: 1.05rem; font-weight: 600;
    background: rgba(0,255,136,0.1); border: 1px solid rgba(0,255,136,0.3);
    color: var(--accent-green); border-radius: var(--border-radius);
    cursor: pointer; transition: all var(--transition-base);
}
.complete-module-btn:hover {
    background: rgba(0,255,136,0.15); box-shadow: var(--shadow-glow-green);
}
.complete-module-btn.completed {
    background: rgba(0,255,136,0.05); color: var(--text-muted);
    cursor: default; border-color: rgba(0,255,136,0.1);
}

/* Bottom Bar */
.player-bottombar {
    height: 56px; display: flex; align-items: center; justify-content: space-between;
    padding: 0 20px; background: var(--bg-secondary); border-top: 1px solid var(--border-card);
    flex-shrink: 0;
}
.module-indicator { font-family: var(--font-code); font-size: 0.85rem; color: var(--text-muted); }

/* --- Quiz Modal --- */
.quiz-modal {
    position: fixed; inset: 0; z-index: 3000; background: rgba(5,10,20,0.9);
    backdrop-filter: blur(10px); display: none; align-items: center; justify-content: center;
    padding: 20px;
}
.quiz-modal.active { display: flex; }

.quiz-container {
    background: var(--bg-secondary); border: 1px solid var(--border-card);
    border-radius: var(--border-radius-lg); max-width: 700px; width: 100%;
    max-height: 90vh; overflow-y: auto; animation: pop-in 0.3s ease;
}
.quiz-header {
    padding: 24px 28px; border-bottom: 1px solid var(--border-card);
    display: flex; justify-content: space-between; align-items: center;
}
.quiz-title { font-family: var(--font-heading); font-size: 1.2rem; font-weight: 600; }
.quiz-progress { font-family: var(--font-code); font-size: 0.85rem; color: var(--text-muted); }

.quiz-body { padding: 28px; }
.quiz-question-text { font-size: 1.1rem; font-weight: 500; margin-bottom: 20px; line-height: 1.6; }
.quiz-options { display: flex; flex-direction: column; gap: 10px; }

.quiz-option {
    display: flex; align-items: center; gap: 12px;
    padding: 14px 18px; border: 1px solid var(--border-card);
    border-radius: var(--border-radius); cursor: pointer;
    transition: all var(--transition-fast); font-size: 0.95rem;
    background: var(--surface-card);
}
.quiz-option:hover { border-color: var(--accent-cyan); background: rgba(0,240,255,0.04); }
.quiz-option.selected { border-color: var(--accent-cyan); background: rgba(0,240,255,0.08); }
.quiz-option.correct { border-color: var(--accent-green); background: rgba(0,255,136,0.1); color: var(--accent-green); }
.quiz-option.wrong { border-color: #FF6B6B; background: rgba(255,107,107,0.1); color: #FF6B6B; }

.quiz-option-letter {
    width: 28px; height: 28px; min-width: 28px; border-radius: 8px;
    background: rgba(0,240,255,0.06); border: 1px solid rgba(0,240,255,0.15);
    display: flex; align-items: center; justify-content: center;
    font-family: var(--font-code); font-size: 0.85rem; font-weight: 600;
}
.quiz-option.correct .quiz-option-letter { background: rgba(0,255,136,0.15); border-color: var(--accent-green); }
.quiz-option.wrong .quiz-option-letter { background: rgba(255,107,107,0.15); border-color: #FF6B6B; }

.quiz-explanation {
    margin-top: 16px; padding: 14px 18px;
    background: rgba(0,240,255,0.04); border-radius: var(--border-radius);
    font-size: 0.9rem; color: var(--text-secondary); line-height: 1.7;
    display: none;
}
.quiz-explanation.visible { display: block; animation: pop-in 0.3s ease; }

.quiz-footer {
    padding: 20px 28px; border-top: 1px solid var(--border-card);
    display: flex; justify-content: flex-end; gap: 12px;
}

/* Quiz Result */
.quiz-result {
    text-align: center; padding: 40px 20px;
}
.quiz-result-icon { font-size: 4rem; margin-bottom: 16px; }
.quiz-result-title { font-family: var(--font-heading); font-size: 1.5rem; font-weight: 700; margin-bottom: 8px; }
.quiz-result-score { font-family: var(--font-display); font-size: 2.5rem; font-weight: 800; margin: 16px 0; }
.quiz-result-score.passed { color: var(--accent-green); }
.quiz-result-score.failed { color: #FF6B6B; }
.quiz-result-message { color: var(--text-secondary); margin-bottom: 24px; font-size: 1rem; }
.quiz-result-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* --- Certificate Modal --- */
.certificate-modal {
    position: fixed; inset: 0; z-index: 3500; background: rgba(5,10,20,0.95);
    backdrop-filter: blur(15px); display: none; align-items: center;
    justify-content: center; padding: 20px;
}
.certificate-modal.active { display: flex; }

.certificate-container {
    background: linear-gradient(135deg,#0A1628,#0F1D35);
    border: 2px solid var(--accent-cyan); border-radius: var(--border-radius-lg);
    max-width: 700px; width: 100%; padding: 60px 40px; text-align: center;
    position: relative; overflow: hidden; animation: certificate-glow 3s ease infinite;
}
.certificate-container::before {
    content:''; position: absolute; inset: 0;
    background: repeating-linear-gradient(45deg,transparent,transparent 30px,rgba(0,240,255,0.02) 30px,rgba(0,240,255,0.02) 60px);
    pointer-events: none;
}

.certificate-badge { font-size: 4rem; margin-bottom: 16px; }
.certificate-title {
    font-family: var(--font-display); font-size: 1.8rem; font-weight: 700;
    background: var(--gradient-primary); -webkit-background-clip: text;
    -webkit-text-fill-color: transparent; background-clip: text; margin-bottom: 8px;
}
.certificate-subtitle { color: var(--text-secondary); font-size: 1.1rem; margin-bottom: 32px; }
.certificate-name {
    font-family: var(--font-display); font-size: 1.5rem; font-weight: 600;
    color: var(--accent-cyan); margin-bottom: 8px;
}
.certificate-course { font-family: var(--font-heading); font-size: 1.2rem; color: var(--text-primary); margin-bottom: 32px; }
.certificate-date { font-family: var(--font-code); font-size: 0.9rem; color: var(--text-muted); margin-bottom: 32px; }
.certificate-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* --- Premium Badge --- */
.course-card-badge.badge-premium {
    background: rgba(123,47,255,0.1);
    color: var(--accent-violet);
    border-color: rgba(123,47,255,0.25);
}

/* --- Courses Toggle Switch --- */
.courses-toggle-wrapper {
    display: flex;
    justify-content: center;
    margin-bottom: 48px;
}

.courses-toggle {
    display: flex;
    position: relative;
    background: var(--surface-card);
    border: 1px solid var(--border-card);
    border-radius: 60px;
    padding: 5px;
    backdrop-filter: blur(12px);
    box-shadow: 0 4px 24px rgba(0,0,0,0.3);
}

.courses-toggle-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 32px;
    border-radius: 55px;
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    position: relative;
    z-index: 2;
    transition: color 0.3s ease;
    background: transparent;
    border: none;
    white-space: nowrap;
}

.courses-toggle-btn:hover {
    color: var(--text-primary);
}

.courses-toggle-btn.active {
    color: var(--bg-primary);
}

.toggle-icon {
    font-size: 1.1rem;
    line-height: 1;
}

.toggle-label {
    line-height: 1;
}

.toggle-count {
    font-family: var(--font-code);
    font-size: 0.7rem;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 50px;
    background: rgba(255,255,255,0.08);
    line-height: 1.4;
    transition: background 0.3s ease, color 0.3s ease;
}

.courses-toggle-btn.active .toggle-count {
    background: rgba(0,0,0,0.2);
    color: var(--bg-primary);
}

/* Sliding indicator */
.toggle-slider {
    position: absolute;
    top: 5px;
    left: 5px;
    height: calc(100% - 10px);
    width: 50%;
    border-radius: 55px;
    background: var(--gradient-primary);
    z-index: 1;
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1),
                box-shadow 0.4s ease;
    box-shadow: 0 0 20px rgba(0,240,255,0.3);
}

.toggle-slider.right {
    transform: translateX(calc(100% - 10px));
    background: linear-gradient(135deg, var(--accent-violet), #9B59B6);
    box-shadow: 0 0 20px rgba(123,47,255,0.3);
}

/* Catalog transition */
.courses-catalog {
    animation: fadeInUp 0.4s ease;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(16px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Empty state */
.courses-empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.courses-empty-state .empty-icon {
    font-size: 3rem;
    margin-bottom: 16px;
    display: block;
}

.courses-empty-state p {
    font-size: 1rem;
    line-height: 1.7;
}

/* Responsive toggle */
@media (max-width: 600px) {
    .courses-toggle-btn {
        padding: 12px 18px;
        font-size: 0.88rem;
        gap: 6px;
    }
    .toggle-label {
        display: none;
    }
    .courses-toggle-btn::after {
        font-size: 0.85rem;
    }
    #toggleFree::after { content: 'Gratuiti'; }
    #togglePaid::after { content: 'Avanzati'; }
    .courses-toggle-wrapper {
        margin-bottom: 32px;
    }
}