/* ==========================================================================
   COURSE PAGE & SLIDE DECK PLAYER STYLES
   ========================================================================== */

.course-main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 30px 24px 80px 24px;
    min-height: 75vh;
}

.course-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 0;
}

.loader-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid rgba(192, 132, 252, 0.2);
    border-top-color: #c026d3;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ---- Course Hero Section ---- */
.course-hero {
    display: flex;
    align-items: center;
    gap: 30px;
    background: var(--course-bg, rgba(15, 2, 18, 0.85));
    border: 1px solid var(--course-border, rgba(192, 132, 252, 0.25));
    border-radius: 20px;
    padding: 36px 40px;
    margin-bottom: 40px;
    box-shadow: 0 12px 35px rgba(0, 0, 0, 0.7);
    flex-wrap: wrap;
}

.course-hero-icon {
    font-size: 3.5rem;
    width: 90px;
    height: 90px;
    min-width: 90px;
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--course-icon-bg, rgba(192, 38, 211, 0.15));
    border: 1px solid var(--course-border, rgba(192, 132, 252, 0.3));
    color: var(--course-color, #e879f9);
    box-shadow: 0 0 30px var(--course-glow, rgba(192, 38, 211, 0.3));
}

.course-hero-info {
    flex: 1;
    min-width: 280px;
}

.course-tag {
    display: inline-block;
    font-size: 0.78rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    background: var(--course-tag-bg, rgba(192, 38, 211, 0.2));
    border: 1px solid var(--course-border, rgba(192, 132, 252, 0.3));
    color: #f5d0fe;
    padding: 4px 12px;
    border-radius: 6px;
    margin-bottom: 12px;
}

.course-title {
    font-size: 2.2rem;
    font-weight: 800;
    color: #ffffff;
    margin: 0 0 12px 0;
    line-height: 1.25;
}

.course-desc {
    color: #cbd5e1;
    font-size: 1.05rem;
    line-height: 1.6;
    margin: 0;
}

.course-stats {
    width: 280px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    background: rgba(8, 1, 13, 0.7);
    border: 1px solid var(--course-border, rgba(192, 132, 252, 0.2));
    border-radius: 14px;
    padding: 20px;
}

.course-progress-block {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.stats-label {
    font-size: 0.78rem;
    text-transform: uppercase;
    color: #94a3b8;
    letter-spacing: 0.5px;
    font-weight: 600;
}

.progress-track {
    width: 100%;
    height: 8px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--course-progress-gradient, linear-gradient(90deg, #c026d3, #f43f5e));
    border-radius: 4px;
    width: 0%;
    transition: width 0.4s ease;
}

.progress-count {
    font-size: 0.85rem;
    font-weight: 700;
    color: #f3e8ff;
    text-align: right;
}

.course-xp-block {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.xp-value {
    font-size: 0.95rem;
    font-weight: 700;
    color: #facc15;
}

.course-cta-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    background: linear-gradient(135deg, #c026d3, #9f1239);
    color: #ffffff;
    font-weight: 700;
    font-size: 0.98rem;
    padding: 12px 20px;
    border-radius: 10px;
    text-decoration: none;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    box-shadow: 0 4px 16px rgba(159, 18, 57, 0.4);
    text-align: center;
}

.course-cta-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(192, 38, 211, 0.5);
}

.course-cta-btn.completed {
    background: linear-gradient(135deg, #059669, #10b981);
    box-shadow: 0 4px 16px rgba(16, 185, 129, 0.4);
}

.course-cert-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    background: rgba(250, 204, 21, 0.15);
    border: 1px solid rgba(250, 204, 21, 0.4);
    color: #facc15;
    font-weight: 700;
    font-size: 0.92rem;
    padding: 10px;
    border-radius: 8px;
    text-decoration: none;
    transition: background 0.2s ease;
}

.course-cert-btn:hover {
    background: rgba(250, 204, 21, 0.25);
}

/* ---- Course Chapters & Lessons ---- */
.course-chapters {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.chapter-block {
    background: rgba(15, 2, 18, 0.7);
    border: 1px solid var(--course-border, rgba(192, 132, 252, 0.2));
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
}

.chapter-head {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px 24px;
    background: rgba(21, 4, 32, 0.8);
    border-bottom: 1px solid var(--course-border, rgba(192, 132, 252, 0.15));
}

.chapter-index {
    font-size: 0.85rem;
    font-weight: 800;
    color: var(--course-color, #f43f5e);
    background: var(--course-tag-bg, rgba(244, 63, 94, 0.15));
    padding: 4px 10px;
    border-radius: 6px;
}

.chapter-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: #ffffff;
    margin: 0;
    flex: 1;
}

.chapter-lesson-count {
    font-size: 0.85rem;
    color: #94a3b8;
    font-weight: 600;
}

.lesson-list {
    display: flex;
    flex-direction: column;
}

.lesson-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 24px;
    color: #e2e8f0;
    text-decoration: none;
    border-bottom: 1px solid rgba(192, 132, 252, 0.08);
    transition: background 0.18s ease, color 0.18s ease;
}

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

.lesson-item:hover {
    background: var(--course-tag-bg, rgba(192, 132, 252, 0.08));
    color: #ffffff;
}

.lesson-item.done .lesson-check,
.sidebar-lesson.done .sidebar-lesson-check {
    background: #10b981 !important;
    border-color: #10b981 !important;
    color: #ffffff !important;
}

.lesson-check,
.sidebar-lesson-check {
    width: 24px;
    height: 24px;
    min-width: 24px;
    border-radius: 50%;
    border: 2px solid var(--course-border, rgba(192, 132, 252, 0.35));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    color: transparent;
}

.sidebar-lesson-check {
    width: 16px;
    height: 16px;
    min-width: 16px;
    font-size: 0.55rem;
}

.lesson-index {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--course-color, #a855f7);
    min-width: 24px;
}

.lesson-item-title {
    flex: 1;
    font-size: 1rem;
    font-weight: 600;
}

.lesson-quiz-mark {
    color: var(--course-color, #c084fc);
    font-size: 0.9rem;
    opacity: 0.8;
}

/* ---- Course Coming Soon ---- */
.course-empty {
    text-align: center;
    padding: 70px 20px;
    background: rgba(15, 2, 18, 0.7);
    border: 1px solid rgba(192, 132, 252, 0.2);
    border-radius: 16px;
}

.course-empty i {
    font-size: 3.5rem;
    color: var(--course-color, #c084fc);
    margin-bottom: 16px;
}

.course-empty h2 {
    color: #ffffff;
    font-size: 1.8rem;
    margin: 0 0 10px 0;
}

.course-empty p {
    color: #94a3b8;
    margin-bottom: 24px;
    font-size: 1.05rem;
}

/* ==========================================================================
   SLIDE DECK PLAYER STYLES
   ========================================================================== */

.slide-deck-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--course-border, rgba(192, 132, 252, 0.2));
}

.slide-counter {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--course-color, #e879f9);
}

.slide-type-tag {
    background: var(--course-tag-bg, rgba(192, 38, 211, 0.25));
    color: #f3e8ff;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
}

.slide-dots {
    display: flex;
    gap: 6px;
}

.slide-dot {
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: rgba(192, 132, 252, 0.25);
    cursor: pointer;
    transition: all 0.2s ease;
}

.slide-dot.active {
    background: var(--course-color, #f43f5e) !important;
    box-shadow: 0 0 8px var(--course-color, #f43f5e) !important;
}

.slide-dot.unlocked {
    background: #10b981;
}

/* Extended vertically (~2x its previous vertical size) */
.slide-card {
    background: var(--course-bg, rgba(15, 2, 18, 0.85));
    border: 1px solid var(--course-border, rgba(192, 132, 252, 0.25));
    border-radius: 18px;
    padding: 60px 50px !important;
    min-height: 650px !important;
    margin-bottom: 28px;
    box-shadow: 0 16px 45px rgba(0, 0, 0, 0.7);
}

.slide-title {
    font-size: 1.8rem;
    color: #ffffff;
    margin-top: 0;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.slide-title i {
    color: var(--course-color, #c084fc);
}

.slide-text {
    color: #d1d5db;
    font-size: 1.15rem;
    line-height: 1.85;
}

.slide-q-badge {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 800;
    text-transform: uppercase;
    color: var(--course-color, #f43f5e);
    background: var(--course-tag-bg, rgba(244, 63, 94, 0.15));
    padding: 6px 12px;
    border-radius: 6px;
    margin-bottom: 16px;
}

.slide-q-text {
    font-size: 1.25rem;
    color: #ffffff;
    margin-bottom: 30px;
    line-height: 1.6;
}

.slide-code-wrap pre {
    background: #08010d;
    padding: 24px;
    border-radius: 10px;
    border: 1px solid var(--course-border, rgba(192, 132, 252, 0.3));
    font-family: monospace;
    font-size: 1.05rem;
    color: #e2e8f0;
    overflow-x: auto;
}

.slide-code-wrap input.blank-input {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--course-color, #c084fc);
    color: #ffffff;
    padding: 6px 12px;
    border-radius: 6px;
    font-family: monospace;
    font-size: 1rem;
    outline: none;
    width: 150px;
}

.slide-code-wrap input.blank-input:focus {
    border-color: var(--course-color, #f43f5e);
    box-shadow: 0 0 8px var(--course-glow, rgba(244, 63, 94, 0.4));
}

/* MCQ Options (Strictly Vertical Stack & Solid Grey Selected Box) */
.mcq-options-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 14px;
}

.mcq-option-btn {
    display: flex !important;
    align-items: center !important;
    gap: 18px !important;
    background: rgba(20, 3, 26, 0.9);
    border: 1px solid var(--course-border, rgba(192, 132, 252, 0.25));
    padding: 18px 24px !important;
    border-radius: 12px;
    color: #e2e8f0;
    cursor: pointer;
    text-align: left;
    width: 100% !important;
    transition: all 0.2s ease;
}

.mcq-option-btn:hover:not(:disabled) {
    border-color: var(--course-color, #c026d3);
    background: var(--course-tag-bg, rgba(192, 38, 211, 0.15));
}

.mcq-option-btn.selected {
    border-color: #94a3b8;
    background: rgba(148, 163, 184, 0.28);
    color: #ffffff;
    box-shadow: 0 0 14px rgba(148, 163, 184, 0.2);
}

.mcq-option-btn:disabled {
    cursor: default;
}

.mcq-option-btn.answer-correct {
    border-color: #10b981;
    background: rgba(16, 185, 129, 0.2);
    color: #d1fae5;
    box-shadow: 0 0 14px rgba(16, 185, 129, 0.3);
}

.mcq-option-btn.answer-wrong {
    border-color: #ef4444;
    background: rgba(239, 68, 68, 0.2);
    color: #fee2e2;
    box-shadow: 0 0 14px rgba(239, 68, 68, 0.3);
}

.option-badge {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    min-width: 34px;
    border-radius: 50%;
    background: var(--course-tag-bg, rgba(192, 132, 252, 0.2));
    font-weight: 700;
    color: var(--course-color, #e879f9);
    font-size: 0.95rem;
}

.mcq-option-btn.selected .option-badge {
    background: #64748b;
    color: #ffffff;
}

.mcq-option-btn.answer-correct .option-badge {
    background: #059669;
    color: #ffffff;
}

.mcq-option-btn.answer-wrong .option-badge {
    background: #dc2626;
    color: #ffffff;
}

/* Feedback Banner */
.slide-feedback-banner {
    padding: 16px 22px;
    border-radius: 10px;
    margin-bottom: 24px;
    font-weight: 600;
    font-size: 1.05rem;
    display: none;
}

.slide-feedback-banner.error {
    display: block;
    background: rgba(239, 68, 68, 0.2);
    border: 1px solid rgba(239, 68, 68, 0.5);
    color: #fca5a5;
}

.slide-feedback-banner.success {
    display: block;
    background: rgba(16, 185, 129, 0.2);
    border: 1px solid rgba(16, 185, 129, 0.5);
    color: #6ee7b7;
}

/* Slide Navigation Footer */
.slide-nav-footer {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    margin-top: 30px;
}

.slide-btn {
    background: #08010d !important;
    border: 1px solid rgba(255, 255, 255, 0.2) !important;
    color: #ffffff !important;
    padding: 14px 28px !important;
    border-radius: 10px !important;
    cursor: pointer;
    font-weight: 600;
    font-size: 1rem !important;
    transition: all 0.2s ease;
}

.slide-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.slide-btn:hover:not(:disabled) {
    background: #150420 !important;
    border-color: rgba(255, 255, 255, 0.4) !important;
}

.slide-btn.primary {
    background: #10b981 !important;
    border: none !important;
    color: #ffffff !important;
    box-shadow: 0 4px 16px rgba(16, 185, 129, 0.4) !important;
}

.slide-btn.primary:hover {
    background: #059669 !important;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(16, 185, 129, 0.5);
}

.lesson-complete-card {
    text-align: center;
    padding: 60px 20px;
    background: rgba(15, 2, 18, 0.8);
    border: 1px solid rgba(16, 185, 129, 0.4);
    border-radius: 16px;
}

.complete-trophy {
    font-size: 4.5rem;
    color: #facc15;
    margin-bottom: 18px;
}

/* Visual XP Toast Popup Animation */
.xp-toast-popup {
    position: fixed;
    bottom: 40px;
    right: 40px;
    background: linear-gradient(135deg, #10b981, #059669);
    color: #ffffff;
    font-weight: 800;
    font-size: 1.2rem;
    padding: 16px 28px;
    border-radius: 14px;
    box-shadow: 0 10px 30px rgba(16, 185, 129, 0.5);
    display: flex;
    align-items: center;
    gap: 12px;
    z-index: 9999;
    transform: translateY(100px);
    opacity: 0;
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275), opacity 0.3s ease;
}

.xp-toast-popup.show {
    transform: translateY(0);
    opacity: 1;
}

.xp-toast-popup i {
    color: #facc15;
    font-size: 1.4rem;
}

@media (max-width: 650px) {
    .slide-card {
        padding: 30px 20px !important;
        min-height: 500px !important;
    }
    .xp-toast-popup {
        bottom: 20px;
        right: 20px;
        left: 20px;
        justify-content: center;
    }
}