/* ==========================================
   COURSE PAGE - PROFESSIONAL STYLES
   متجاوب بالكامل للجوال واللابتوب
   ========================================== */

.course-page {
    padding-top: 80px;
    min-height: calc(100vh - 200px);
}

/* --- Header Section --- */
.course-header {
    background: var(--gradient);
    color: var(--white);
    padding: 50px 0 60px;
    position: relative;
    overflow: hidden;
}

/* Decorative overlay */
.course-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        radial-gradient(circle at 20% 80%, rgba(255, 255, 255, 0.08) 0%, transparent 25%),
        radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.08) 0%, transparent 25%);
    pointer-events: none;
}

.course-header .container {
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: 40px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.course-header h1 {
    font-size: 2.2rem;
    font-weight: 800;
    margin: 12px 0 18px;
    line-height: 1.4;
}

.course-description {
    opacity: 0.92;
    margin-bottom: 24px;
    line-height: 1.8;
    font-size: 1rem;
    max-width: 95%;
}

.course-meta-info {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    background: rgba(255, 255, 255, 0.12);
    padding: 12px 20px;
    border-radius: var(--radius);
    backdrop-filter: blur(8px);
    width: fit-content;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.course-meta-info span {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
    font-size: 0.92rem;
}

/* --- Header Image / Player Container --- */
.course-header-image {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    background: #000;
    aspect-ratio: 4 / 3;
    display: flex;
    align-items: center;
    justify-content: center;
    max-width: 280px;
    transition: all 0.4s ease;
}

/* عند تشغيل الفيديو - توسيع الإطار */
.course-header-image.playing {
    max-width: 100%;
    aspect-ratio: 16 / 9;
    grid-column: 1 / -1;
}

.course-header-image:hover {
    transform: translateY(-4px);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.35);
}

.course-header-image.playing:hover {
    transform: none;
}

.course-header-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.course-header-image iframe,
.course-header-image video {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

/* Start Button inside image container */
.course-header-image .btn {
    position: absolute;
    bottom: 12px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.85rem;
    padding: 8px 18px;
    white-space: nowrap;
    backdrop-filter: blur(8px);
    background: rgba(99, 102, 241, 0.9);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

/* --- Main Content Layout --- */
.course-body {
    display: grid;
    grid-template-columns: 1fr 340px;
    gap: 35px;
    padding: 50px 20px;
    max-width: 1200px;
    margin: 0 auto;
}

/* --- Lessons List --- */
.course-content-section h2 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: var(--dark);
    font-weight: 700;
    border-right: 4px solid var(--primary);
    padding-right: 14px;
    position: relative;
}

.lessons-list {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-200);
}

.lesson-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 20px;
    border-bottom: 1px solid var(--gray-100);
    transition: var(--transition);
    background: var(--white);
}

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

.lesson-item:hover {
    background: var(--gray-100);
}

.lesson-item.active {
    background: #eff6ff;
}

/* RTL active border */
html[dir="rtl"] .lesson-item.active {
    border-left: none;
    border-right: 4px solid var(--primary);
}

.lesson-number {
    width: 36px;
    height: 36px;
    background: var(--gray-200);
    color: var(--gray-600);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.9rem;
    flex-shrink: 0;
    transition: var(--transition);
}

.lesson-item.active .lesson-number,
.lesson-item:hover .lesson-number {
    background: var(--primary);
    color: var(--white);
}

.lesson-info {
    flex: 1;
    min-width: 0;
}

.lesson-info h4 {
    font-size: 0.95rem;
    color: var(--dark);
    margin-bottom: 4px;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.lesson-type {
    font-size: 0.8rem;
    color: var(--gray-500);
    background: var(--gray-100);
    padding: 2px 8px;
    border-radius: 12px;
    display: inline-block;
}

.lesson-duration {
    color: var(--gray-500);
    font-size: 0.8rem;
    font-family: 'Cairo', monospace;
    background: var(--gray-100);
    padding: 3px 8px;
    border-radius: 6px;
    flex-shrink: 0;
}

.lesson-status-icon {
    font-size: 1.1rem;
    color: var(--gray-400);
}

.lesson-item.clickable {
    cursor: pointer;
}

/* --- Sidebar --- */
.course-sidebar {
    position: sticky;
    top: 100px;
    height: fit-content;
}

.price-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 30px;
    box-shadow: var(--shadow-lg);
    text-align: center;
    border: 1px solid var(--gray-100);
    position: relative;
    overflow: hidden;
}

/* Gradient top border */
.price-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: var(--gradient);
}

.price-value {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 20px;
    letter-spacing: -1px;
}

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

.price-card .btn {
    width: 100%;
    margin-bottom: 20px;
    padding: 14px;
    font-size: 1rem;
    transition: transform 0.2s, box-shadow 0.2s;
}

.price-card .btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(99, 102, 241, 0.25);
}

.course-includes {
    text-align: right;
    background: var(--gray-100);
    padding: 16px;
    border-radius: var(--radius);
}

.course-includes li {
    padding: 8px 0;
    color: var(--gray-600);
    border-bottom: 1px dashed var(--gray-300);
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.92rem;
}

.course-includes li:last-child {
    border-bottom: none;
}


/* ==========================================
   RESPONSIVE - TABLET (max-width: 992px)
   ========================================== */
@media (max-width: 992px) {
    .course-header .container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 30px;
    }

    .course-header-image {
        order: -1;
        max-width: 260px;
        margin: 0 auto;
        aspect-ratio: 4 / 3;
        box-shadow: 0 12px 30px rgba(0, 0, 0, 0.25);
    }

    .course-header h1 {
        font-size: 1.8rem;
    }

    .course-meta-info {
        margin: 0 auto;
        justify-content: center;
    }

    .course-description {
        margin-left: auto;
        margin-right: auto;
        max-width: 100%;
    }

    .course-body {
        grid-template-columns: 1fr;
        gap: 30px;
        padding: 40px 16px;
    }

    .course-sidebar {
        position: static;
        max-width: 500px;
        margin: 0 auto;
        order: 1;
    }
}

/* ==========================================
   RESPONSIVE - MOBILE (max-width: 768px)
   ========================================== */
@media (max-width: 768px) {
    .course-page {
        padding-top: 65px;
    }

    .course-header {
        padding: 30px 0 40px;
    }

    .course-header h1 {
        font-size: 1.5rem;
        margin: 8px 0 12px;
    }

    .course-description {
        font-size: 0.9rem;
        margin-bottom: 16px;
        line-height: 1.7;
    }

    .course-header-image {
        max-width: 200px;
        border-radius: var(--radius);
    }

    .course-header-image .btn {
        font-size: 0.78rem;
        padding: 6px 14px;
        bottom: 8px;
    }

    .course-meta-info {
        gap: 12px;
        padding: 10px 14px;
        font-size: 0.85rem;
    }

    .course-meta-info span {
        font-size: 0.82rem;
        gap: 5px;
    }

    .course-body {
        padding: 25px 12px;
        gap: 25px;
    }

    .course-content-section h2 {
        font-size: 1.25rem;
        margin-bottom: 16px;
    }

    .lesson-item {
        padding: 12px 14px;
        gap: 10px;
    }

    .lesson-number {
        width: 30px;
        height: 30px;
        font-size: 0.8rem;
    }

    .lesson-info h4 {
        font-size: 0.88rem;
    }

    .lesson-type {
        font-size: 0.72rem;
    }

    .lesson-duration {
        font-size: 0.72rem;
        padding: 2px 6px;
    }

    .price-card {
        padding: 20px;
    }

    .price-value {
        font-size: 2rem;
        margin-bottom: 16px;
    }

    .price-card .btn {
        padding: 12px;
        font-size: 0.95rem;
        margin-bottom: 16px;
    }

    .course-includes li {
        font-size: 0.85rem;
        padding: 6px 0;
    }
}

/* ==========================================
   RESPONSIVE - SMALL MOBILE (max-width: 480px)
   ========================================== */
@media (max-width: 480px) {
    .course-header h1 {
        font-size: 1.3rem;
    }

    .course-header-image {
        max-width: 180px;
    }

    .course-meta-info {
        flex-direction: column;
        gap: 8px;
        align-items: center;
    }

    .lesson-item {
        padding: 10px 12px;
        gap: 8px;
    }

    .lesson-number {
        width: 28px;
        height: 28px;
        font-size: 0.75rem;
    }

    .lesson-info h4 {
        font-size: 0.82rem;
    }

    .price-value {
        font-size: 1.8rem;
    }
}

/* ==========================================
   EXERCISE / PRACTICAL SECTION STYLES
   ========================================== */

.exercise-container {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    border: 1px solid var(--gray-200);
    animation: exerciseFadeIn 0.4s ease-out;
}

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

.exercise-header {
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);
    color: white;
    padding: 28px 32px;
    position: relative;
    overflow: hidden;
}

.exercise-header::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 200px;
    height: 200px;
    background: rgba(255,255,255,0.06);
    border-radius: 50%;
    pointer-events: none;
}

.exercise-header::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 150px;
    height: 150px;
    background: rgba(255,255,255,0.04);
    border-radius: 50%;
    pointer-events: none;
}

.exercise-header-icon {
    font-size: 2.2rem;
    margin-bottom: 8px;
    display: block;
}

.exercise-header h3 {
    font-size: 1.4rem;
    font-weight: 700;
    margin: 0;
    position: relative;
    z-index: 1;
}

.exercise-badge {
    display: inline-block;
    background: rgba(255,255,255,0.2);
    backdrop-filter: blur(4px);
    padding: 4px 14px;
    border-radius: 20px;
    font-size: 0.82rem;
    font-weight: 600;
    margin-top: 10px;
    border: 1px solid rgba(255,255,255,0.15);
    position: relative;
    z-index: 1;
}

.exercise-body {
    padding: 32px;
    color: var(--gray-700);
    background: var(--white);
}

/* Direct styling (not requiring .exercise-section wrapper) */
.exercise-body h1,
.exercise-body h2 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--primary);
    display: inline-block;
    line-height: 1.5;
}

.exercise-body h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--dark);
    margin: 16px 0 10px;
    line-height: 1.5;
}

.exercise-body p {
    color: var(--gray-700);
    line-height: 1.9;
    font-size: 0.95rem;
    margin-bottom: 10px;
}

.exercise-body ul,
.exercise-body ol {
    list-style: none;
    padding: 0;
    margin: 8px 0;
}

.exercise-body ul li,
.exercise-body ol li {
    position: relative;
    padding: 6px 20px 6px 0;
    color: var(--gray-700);
    font-size: 0.92rem;
    line-height: 1.7;
}

.exercise-body ul li::before {
    content: '•';
    color: var(--primary);
    font-weight: bold;
    position: absolute;
    right: 4px;
}

.exercise-body ol {
    counter-reset: exercise-counter;
}

.exercise-body ol li::before {
    content: counter(exercise-counter) '.';
    counter-increment: exercise-counter;
    color: var(--primary);
    font-weight: 700;
    position: absolute;
    right: 0;
}

.exercise-body code {
    background: #f1f5f9;
    color: #4338ca;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.88rem;
    font-family: 'Courier New', monospace;
    direction: ltr;
    display: inline-block;
}

.exercise-body pre {
    background: #1e1e2e;
    color: #e2e8f0;
    padding: 18px 24px;
    border-radius: 12px;
    overflow-x: auto;
    margin: 14px 0;
    direction: ltr;
    text-align: left;
}

.exercise-body pre code {
    background: transparent;
    color: inherit;
    padding: 0;
}

.exercise-body strong {
    color: var(--dark);
    font-weight: 700;
}

.exercise-body blockquote {
    border-right: 4px solid var(--primary);
    padding: 8px 16px;
    margin: 12px 0;
    background: #f8fafc;
    color: var(--gray-700);
    border-radius: 0 8px 8px 0;
}

/* Exercise mode: override the 16/9 aspect ratio from .playing */
.course-header-image.exercise-mode {
    aspect-ratio: unset;
    max-width: 100%;
    grid-column: 1 / -1;
    background: var(--white);
    display: block;
    align-items: unset;
    justify-content: unset;
}

.exercise-body .exercise-section {
    margin-bottom: 24px;
}

.exercise-body .exercise-section:last-child {
    margin-bottom: 0;
}

.exercise-body .exercise-section h2 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--primary);
    display: inline-block;
    border-right: none;
    padding-right: 0;
}

.exercise-body .exercise-section h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--dark);
    margin: 16px 0 10px;
}

.exercise-body .exercise-section p {
    color: var(--gray-700);
    line-height: 1.9;
    font-size: 0.95rem;
    margin-bottom: 10px;
}

.exercise-body .exercise-section ul {
    list-style: none;
    padding: 0;
    margin: 8px 0;
}

.exercise-body .exercise-section ul li {
    position: relative;
    padding: 6px 20px 6px 0;
    color: var(--gray-700);
    font-size: 0.92rem;
    line-height: 1.7;
}

.exercise-body .exercise-section ul li::before {
    content: '•';
    color: var(--primary);
    font-weight: bold;
    font-size: 1.2rem;
    position: absolute;
    right: 0;
    top: 5px;
}

.exercise-body .exercise-section ul li ul {
    margin-top: 4px;
    padding-right: 16px;
}

.exercise-body .exercise-section ul li ul li::before {
    content: '◦';
    color: #a855f7;
}

.exercise-code-block {
    background: #1e1e2e;
    border-radius: var(--radius);
    overflow: hidden;
    margin: 16px 0;
    box-shadow: 0 4px 16px rgba(0,0,0,0.15);
    border: 1px solid #313244;
}

.exercise-code-header {
    background: #313244;
    padding: 8px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.exercise-code-header span {
    color: #cdd6f4;
    font-size: 0.78rem;
    font-weight: 600;
    font-family: 'Cairo', sans-serif;
}

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

.exercise-code-dots span {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    display: inline-block;
}

.exercise-code-dots span:nth-child(1) { background: #f38ba8; }
.exercise-code-dots span:nth-child(2) { background: #f9e2af; }
.exercise-code-dots span:nth-child(3) { background: #a6e3a1; }

.exercise-code-block pre {
    margin: 0;
    padding: 16px 20px;
    overflow-x: auto;
}

.exercise-code-block code {
    color: #cdd6f4;
    font-family: 'Fira Code', 'Courier New', monospace;
    font-size: 0.88rem;
    line-height: 1.7;
}

.exercise-inline-code {
    background: #eef2ff;
    color: #4f46e5;
    padding: 2px 8px;
    border-radius: 4px;
    font-family: 'Fira Code', 'Courier New', monospace;
    font-size: 0.88rem;
    font-weight: 500;
    border: 1px solid #c7d2fe;
}

.exercise-hint-box {
    background: linear-gradient(135deg, #fef3c7, #fde68a);
    border: 1px solid #f59e0b;
    border-radius: var(--radius);
    padding: 18px 22px;
    margin: 16px 0;
}

.exercise-hint-box h3,
.exercise-hint-box strong {
    color: #92400e;
}

.exercise-hint-box p,
.exercise-hint-box ul li {
    color: #78350f;
}

.exercise-output-box {
    background: linear-gradient(135deg, #ecfdf5, #d1fae5);
    border: 1px solid #10b981;
    border-radius: var(--radius);
    padding: 18px 22px;
    margin: 16px 0;
}

.exercise-output-box h3,
.exercise-output-box strong {
    color: #065f46;
}

.exercise-output-box p,
.exercise-output-box ul li {
    color: #064e3b;
}

.exercise-footer {
    background: var(--gray-100);
    padding: 20px 32px;
    border-top: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.exercise-footer .btn {
    padding: 12px 32px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius);
    transition: all 0.25s ease;
}

.exercise-footer .btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(99, 102, 241, 0.3);
}

.lesson-item.is-exercise {
    background: linear-gradient(135deg, #faf5ff, #f3e8ff);
    border-right: 3px solid #a855f7;
}

.lesson-item.is-exercise:hover {
    background: linear-gradient(135deg, #f5f0ff, #ede5ff);
}

.lesson-item.is-exercise .lesson-number {
    background: linear-gradient(135deg, #8b5cf6, #a855f7);
    color: white;
    font-size: 0.8rem;
}

.exercise-type-badge {
    background: linear-gradient(135deg, #8b5cf6, #a855f7);
    color: white;
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 0.72rem;
    font-weight: 600;
    margin-right: 6px;
}

@media (max-width: 768px) {
    .exercise-header {
        padding: 20px 18px;
    }

    .exercise-header h3 {
        font-size: 1.1rem;
    }

    .exercise-body {
        padding: 20px 16px;
    }

    .exercise-body .exercise-section h2 {
        font-size: 1.05rem;
    }

    .exercise-code-block code {
        font-size: 0.8rem;
    }

    .exercise-footer {
        padding: 16px;
        flex-direction: column;
    }

    .exercise-footer .btn {
        width: 100%;
    }
}

/* ==========================================
   SUMMARY / PDF SECTION STYLES
   ========================================== */

.summary-container {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    border: 1px solid var(--gray-200);
    animation: summaryFadeIn 0.4s ease-out;
}

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

.summary-header {
    background: linear-gradient(135deg, #6366f1 0%, #3b82f6 50%, #06b6d4 100%);
    color: white;
    padding: 28px 32px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.summary-header::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 200px;
    height: 200px;
    background: rgba(255,255,255,0.06);
    border-radius: 50%;
    pointer-events: none;
}

.summary-header-icon {
    font-size: 2.5rem;
    display: block;
    margin-bottom: 8px;
}

.summary-header h3 {
    font-size: 1.4rem;
    font-weight: 700;
    margin: 0;
}

.summary-badge {
    display: inline-block;
    background: rgba(255,255,255,0.2);
    backdrop-filter: blur(4px);
    padding: 5px 16px;
    border-radius: 20px;
    font-size: 0.82rem;
    font-weight: 600;
    margin-top: 10px;
    border: 1px solid rgba(255,255,255,0.15);
}

.summary-body {
    padding: 0;
    background: #f8fafc;
}

.summary-iframe {
    width: 100%;
    height: 70vh;
    min-height: 500px;
    border: none;
    display: block;
}

.summary-actions {
    padding: 16px 32px;
    text-align: center;
    background: var(--white);
    border-top: 1px solid var(--gray-100);
}

.summary-footer {
    padding: 20px 32px;
    text-align: center;
    background: var(--gray-100);
    border-top: 1px solid var(--gray-200);
}

.lesson-item.is-summary {
    background: linear-gradient(135deg, #eff6ff, #dbeafe);
    border-right: 3px solid #3b82f6;
}

.lesson-item.is-summary:hover {
    background: linear-gradient(135deg, #dbeafe, #bfdbfe);
}

.lesson-item.is-summary .lesson-number {
    background: linear-gradient(135deg, #3b82f6, #06b6d4);
    color: white;
}

.summary-type-badge {
    background: linear-gradient(135deg, #3b82f6, #06b6d4);
    color: white;
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 0.72rem;
    font-weight: 600;
    margin-right: 6px;
}

@media (max-width: 768px) {
    .summary-header {
        padding: 20px 16px;
    }

    .summary-header h3 {
        font-size: 1.1rem;
    }

    .summary-iframe {
        height: 50vh;
        min-height: 350px;
    }

    .summary-actions {
        padding: 12px 16px;
    }

    .summary-footer {
        padding: 16px;
    }
}