/* ================================================
   GEM COURSE DETAIL - Standalone Stylesheet
   Prefix: .gcd- (Gem Course Detail)
   Created: 2026-02-11
   NO dependency on other CSS files
   ================================================ */

/* ===== Variables ===== */
.gcd-page {
    --gcd-primary: #4632da;
    --gcd-primary-light: #6558e8;
    --gcd-primary-dark: #3425a8;
    --gcd-secondary: #107de7;
    --gcd-accent: #ffc100;
    --gcd-accent-light: #fff3cc;
    --gcd-success: #10B981;
    --gcd-warning: #F59E0B;
    --gcd-error: #EF4444;
    --gcd-white: #FFFFFF;
    --gcd-gray-50: #F9FAFB;
    --gcd-gray-100: #F3F4F6;
    --gcd-gray-200: #E5E7EB;
    --gcd-gray-300: #D1D5DB;
    --gcd-gray-400: #9CA3AF;
    --gcd-gray-500: #6B7280;
    --gcd-gray-600: #4B5563;
    --gcd-gray-700: #374151;
    --gcd-gray-800: #1F2937;
    --gcd-gray-900: #111827;
    --gcd-font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --gcd-radius-sm: 6px;
    --gcd-radius: 10px;
    --gcd-radius-md: 14px;
    --gcd-radius-lg: 20px;
    --gcd-radius-xl: 28px;
    --gcd-shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
    --gcd-shadow: 0 4px 16px rgba(70,50,218,0.08);
    --gcd-shadow-md: 0 8px 30px rgba(70,50,218,0.12);
    --gcd-shadow-lg: 0 16px 48px rgba(70,50,218,0.15);
    --gcd-transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --gcd-container: 1200px;
}

/* ===== Reset within scope ===== */
.gcd-page {
    margin: 0;
    padding: 0;
    font-family: var(--gcd-font);
    color: var(--gcd-gray-800);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    background: var(--gcd-gray-50);
}

.gcd-page *, .gcd-page *::before, .gcd-page *::after {
    box-sizing: border-box;
}

.gcd-page img {
    max-width: 100%;
    height: auto;
    display: block;
}

.gcd-page a {
    text-decoration: none;
    color: inherit;
}

/* ===== Container ===== */
.gcd-container {
    max-width: var(--gcd-container);
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== Breadcrumb ===== */
.gcd-breadcrumb {
    background: var(--gcd-white);
    border-bottom: 1px solid var(--gcd-gray-100);
    padding: 16px 0;
}

.gcd-breadcrumb-list {
    list-style: none;
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 0;
    padding: 0;
    font-size: 14px;
    flex-wrap: wrap;
}

.gcd-breadcrumb-list li {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--gcd-gray-500);
}

.gcd-breadcrumb-list li:not(:last-child)::after {
    content: '\f054';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    font-size: 9px;
    color: var(--gcd-gray-300);
}

.gcd-breadcrumb-list li a {
    color: var(--gcd-gray-500);
    transition: color var(--gcd-transition);
}

.gcd-breadcrumb-list li a:hover {
    color: var(--gcd-primary);
}

.gcd-breadcrumb-list li:last-child {
    color: var(--gcd-primary);
    font-weight: 600;
}

/* ===== Hero Section ===== */
.gcd-hero {
    background: linear-gradient(135deg, #1a0e5e 0%, var(--gcd-primary) 40%, var(--gcd-secondary) 100%);
    padding: 48px 0 56px;
    position: relative;
    overflow: hidden;
}

.gcd-hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(255,193,0,0.12) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.gcd-hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(16,125,231,0.15) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.gcd-hero-grid {
    display: grid;
    grid-template-columns: 1fr 380px;
    gap: 48px;
    align-items: start;
    position: relative;
    z-index: 1;
}

.gcd-hero-content {
    color: var(--gcd-white);
}

.gcd-category-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: rgba(255,193,0,0.2);
    color: var(--gcd-accent);
    padding: 6px 16px;
    border-radius: 50px;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.3px;
    border: 1px solid rgba(255,193,0,0.3);
    margin-bottom: 20px;
}

.gcd-hero-title {
    font-size: 36px;
    font-weight: 800;
    line-height: 1.25;
    margin-bottom: 20px;
    letter-spacing: -0.3px;
}

.gcd-hero-desc {
    font-size: 16px;
    line-height: 1.7;
    color: rgba(255,255,255,0.85);
    margin-bottom: 28px;
    max-width: 600px;
}

.gcd-hero-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 24px;
}

.gcd-meta-chip {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(255,255,255,0.12);
    backdrop-filter: blur(8px);
    padding: 8px 16px;
    border-radius: 50px;
    font-size: 14px;
    color: rgba(255,255,255,0.95);
    border: 1px solid rgba(255,255,255,0.1);
}

.gcd-meta-chip i {
    font-size: 13px;
    color: var(--gcd-accent);
}

.gcd-rating-stars {
    display: inline-flex;
    gap: 2px;
}

.gcd-rating-stars i {
    color: var(--gcd-accent) !important;
    font-size: 13px;
}

/* ===== Sticky Price Card (sidebar) ===== */
.gcd-sidebar-wrap {
    position: relative;
}

.gcd-price-card {
    background: var(--gcd-white);
    border-radius: var(--gcd-radius-lg);
    overflow: hidden;
    box-shadow: var(--gcd-shadow-lg);
    position: sticky;
    top: 24px;
}

.gcd-price-card-img {
    width: 100%;
    height: 220px;
    object-fit: cover;
}

.gcd-price-card-body {
    padding: 28px 24px;
}

.gcd-price-row {
    display: flex;
    align-items: baseline;
    gap: 12px;
    margin-bottom: 8px;
    flex-wrap: wrap;
}

.gcd-price-current {
    font-size: 32px;
    font-weight: 800;
    color: var(--gcd-primary);
    letter-spacing: -0.5px;
}

.gcd-price-original {
    font-size: 18px;
    color: var(--gcd-gray-400);
    text-decoration: line-through;
}

.gcd-discount-tag {
    display: inline-flex;
    align-items: center;
    background: linear-gradient(135deg, #ff6b6b, var(--gcd-error));
    color: var(--gcd-white);
    padding: 4px 12px;
    border-radius: 50px;
    font-size: 13px;
    font-weight: 700;
}

.gcd-price-free {
    font-size: 32px;
    font-weight: 800;
    color: var(--gcd-success);
}

.gcd-price-note {
    font-size: 13px;
    color: var(--gcd-gray-500);
    margin-bottom: 24px;
}

.gcd-enroll-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    padding: 16px 24px;
    border: none;
    border-radius: var(--gcd-radius-md);
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--gcd-transition);
    text-align: center;
    letter-spacing: 0.2px;
}

.gcd-enroll-btn--primary {
    background: linear-gradient(135deg, var(--gcd-primary) 0%, var(--gcd-primary-light) 100%);
    color: var(--gcd-white);
    box-shadow: 0 4px 20px rgba(70,50,218,0.35);
}

.gcd-enroll-btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(70,50,218,0.45);
}

.gcd-enroll-btn--success {
    background: linear-gradient(135deg, var(--gcd-success) 0%, #059669 100%);
    color: var(--gcd-white);
    box-shadow: 0 4px 20px rgba(16,185,129,0.35);
}

.gcd-enroll-btn--success:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(16,185,129,0.45);
}

.gcd-features-list {
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--gcd-gray-100);
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.gcd-feature-row {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
    color: var(--gcd-gray-600);
}

.gcd-feature-row i {
    width: 20px;
    text-align: center;
    color: var(--gcd-primary);
    font-size: 14px;
}

/* ===== Main Content Area ===== */
.gcd-main {
    padding: 48px 0 64px;
}

.gcd-main-grid {
    display: grid;
    grid-template-columns: 1fr 380px;
    gap: 48px;
    align-items: start;
}

.gcd-content-col {
    min-width: 0;
}

/* ===== Content Sections (cards) ===== */
.gcd-card {
    background: var(--gcd-white);
    border-radius: var(--gcd-radius-lg);
    padding: 36px 32px;
    margin-bottom: 28px;
    box-shadow: var(--gcd-shadow);
    border: 1px solid var(--gcd-gray-100);
    transition: box-shadow var(--gcd-transition);
}

.gcd-card:hover {
    box-shadow: var(--gcd-shadow-md);
}

.gcd-card-title {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 22px;
    font-weight: 700;
    color: var(--gcd-gray-900);
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 2px solid var(--gcd-gray-100);
}

.gcd-card-title i {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--gcd-radius);
    font-size: 16px;
    flex-shrink: 0;
}

.gcd-card-title .gcd-icon-green {
    background: linear-gradient(135deg, #d1fae5, #a7f3d0);
    color: #059669;
}

.gcd-card-title .gcd-icon-blue {
    background: linear-gradient(135deg, #dbeafe, #bfdbfe);
    color: #2563eb;
}

.gcd-card-title .gcd-icon-purple {
    background: linear-gradient(135deg, #ede9fe, #ddd6fe);
    color: var(--gcd-primary);
}

.gcd-card-title .gcd-icon-yellow {
    background: linear-gradient(135deg, #fef3c7, #fde68a);
    color: #d97706;
}

.gcd-card-title .gcd-icon-red {
    background: linear-gradient(135deg, #fee2e2, #fecaca);
    color: #dc2626;
}

/* ===== "What you'll learn" grid ===== */
.gcd-learn-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}

.gcd-learn-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 12px 16px;
    border-radius: var(--gcd-radius);
    background: var(--gcd-gray-50);
    transition: all var(--gcd-transition);
}

.gcd-learn-item:hover {
    background: #eef2ff;
    transform: translateX(4px);
}

.gcd-learn-item i {
    color: var(--gcd-success);
    margin-top: 3px;
    flex-shrink: 0;
    font-size: 14px;
}

.gcd-learn-item span {
    font-size: 14px;
    color: var(--gcd-gray-700);
    line-height: 1.5;
}

/* ===== Course Description ===== */
.gcd-description-body {
    font-size: 15px;
    color: var(--gcd-gray-700);
    line-height: 1.8;
}

.gcd-description-body p {
    margin-bottom: 16px;
}

/* ===== Curriculum / Lessons ===== */
.gcd-curriculum-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.gcd-lesson-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 20px;
    border-radius: var(--gcd-radius);
    background: var(--gcd-gray-50);
    border: 1px solid transparent;
    transition: all var(--gcd-transition);
}

.gcd-lesson-item:hover {
    border-color: var(--gcd-primary);
    background: #f5f3ff;
    transform: translateX(4px);
}

.gcd-lesson-num {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--gcd-primary), var(--gcd-primary-light));
    color: var(--gcd-white);
    border-radius: 50%;
    font-size: 14px;
    font-weight: 700;
    flex-shrink: 0;
}

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

.gcd-lesson-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--gcd-gray-800);
    margin-bottom: 2px;
}

.gcd-lesson-desc {
    font-size: 13px;
    color: var(--gcd-gray-500);
}

.gcd-lesson-duration {
    font-size: 13px;
    color: var(--gcd-gray-500);
    display: flex;
    align-items: center;
    gap: 6px;
    flex-shrink: 0;
    background: var(--gcd-white);
    padding: 4px 12px;
    border-radius: 50px;
}

.gcd-lesson-duration i {
    color: var(--gcd-primary);
    font-size: 12px;
}

/* ===== Reviews Section ===== */
.gcd-rating-overview {
    display: flex;
    align-items: center;
    gap: 24px;
    padding: 24px;
    background: linear-gradient(135deg, #fef3c7 0%, #fff7ed 100%);
    border-radius: var(--gcd-radius-md);
    margin-bottom: 28px;
}

.gcd-rating-big-num {
    font-size: 56px;
    font-weight: 800;
    color: var(--gcd-gray-900);
    line-height: 1;
}

.gcd-rating-big-stars {
    display: flex;
    gap: 3px;
    margin-bottom: 4px;
}

.gcd-rating-big-stars i {
    color: var(--gcd-warning);
    font-size: 18px;
}

.gcd-rating-big-count {
    font-size: 14px;
    color: var(--gcd-gray-500);
}

.gcd-review-item {
    padding: 20px 0;
    border-bottom: 1px solid var(--gcd-gray-100);
}

.gcd-review-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.gcd-review-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}

.gcd-reviewer-info {
    display: flex;
    align-items: center;
    gap: 14px;
}

.gcd-reviewer-avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--gcd-gray-100);
}

.gcd-reviewer-name {
    font-size: 15px;
    font-weight: 600;
    color: var(--gcd-gray-800);
    margin-bottom: 2px;
}

.gcd-reviewer-stars {
    display: flex;
    gap: 2px;
}

.gcd-reviewer-stars i {
    font-size: 12px;
}

.gcd-review-date {
    font-size: 13px;
    color: var(--gcd-gray-400);
}

.gcd-review-text {
    font-size: 14px;
    color: var(--gcd-gray-600);
    line-height: 1.7;
}

.gcd-no-reviews {
    text-align: center;
    padding: 40px 20px;
    color: var(--gcd-gray-400);
    font-size: 15px;
}

.gcd-no-reviews i {
    font-size: 40px;
    margin-bottom: 12px;
    display: block;
    color: var(--gcd-gray-300);
}

/* ===== Related Courses ===== */
.gcd-related {
    padding: 0 0 64px;
}

.gcd-related-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--gcd-gray-900);
    margin-bottom: 28px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.gcd-related-title i {
    color: var(--gcd-primary);
}

.gcd-related-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.gcd-related-card {
    background: var(--gcd-white);
    border-radius: var(--gcd-radius-md);
    overflow: hidden;
    box-shadow: var(--gcd-shadow);
    border: 1px solid var(--gcd-gray-100);
    transition: all var(--gcd-transition);
    display: block;
}

.gcd-related-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--gcd-shadow-lg);
}

.gcd-related-card-img {
    width: 100%;
    height: 160px;
    object-fit: cover;
}

.gcd-related-card-body {
    padding: 16px;
}

.gcd-related-card-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--gcd-gray-800);
    margin-bottom: 10px;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.gcd-related-card-price {
    font-size: 16px;
    font-weight: 700;
    color: var(--gcd-primary);
}

/* ===== Animations ===== */
@keyframes gcdFadeInUp {
    from {
        opacity: 0;
        transform: translateY(24px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.gcd-animate {
    animation: gcdFadeInUp 0.6s ease forwards;
}

.gcd-animate-delay-1 { animation-delay: 0.1s; }
.gcd-animate-delay-2 { animation-delay: 0.2s; }
.gcd-animate-delay-3 { animation-delay: 0.3s; }

/* ===== Responsive ===== */

/* Tablet */
@media (max-width: 1024px) {
    .gcd-hero-grid {
        grid-template-columns: 1fr 340px;
        gap: 32px;
    }

    .gcd-main-grid {
        grid-template-columns: 1fr 340px;
        gap: 32px;
    }

    .gcd-hero-title {
        font-size: 30px;
    }

    .gcd-related-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Small Tablet */
@media (max-width: 868px) {
    .gcd-hero-grid {
        grid-template-columns: 1fr;
        gap: 28px;
    }

    .gcd-main-grid {
        grid-template-columns: 1fr;
    }

    .gcd-price-card {
        position: relative;
        top: 0;
    }

    .gcd-price-card-img {
        height: 260px;
    }

    .gcd-hero-title {
        font-size: 28px;
    }

    .gcd-card {
        padding: 28px 24px;
    }

    .gcd-learn-grid {
        grid-template-columns: 1fr;
    }

    .gcd-related-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .gcd-sidebar-wrap {
        order: -1;
    }
}

/* Mobile */
@media (max-width: 576px) {
    .gcd-container {
        padding: 0 16px;
    }

    .gcd-hero {
        padding: 32px 0 40px;
    }

    .gcd-hero-title {
        font-size: 24px;
    }

    .gcd-hero-desc {
        font-size: 15px;
    }

    .gcd-hero-meta {
        gap: 10px;
    }

    .gcd-meta-chip {
        padding: 6px 12px;
        font-size: 13px;
    }

    .gcd-price-card-img {
        height: 200px;
    }

    .gcd-price-card-body {
        padding: 20px 16px;
    }

    .gcd-price-current, .gcd-price-free {
        font-size: 28px;
    }

    .gcd-card {
        padding: 24px 18px;
        margin-bottom: 20px;
        border-radius: var(--gcd-radius-md);
    }

    .gcd-card-title {
        font-size: 19px;
        gap: 10px;
    }

    .gcd-card-title i {
        width: 34px;
        height: 34px;
        font-size: 14px;
    }

    .gcd-main {
        padding: 32px 0 48px;
    }

    .gcd-lesson-item {
        padding: 14px 16px;
        gap: 12px;
    }

    .gcd-lesson-num {
        width: 32px;
        height: 32px;
        font-size: 13px;
    }

    .gcd-rating-overview {
        flex-direction: column;
        text-align: center;
        gap: 12px;
        padding: 20px;
    }

    .gcd-rating-big-num {
        font-size: 44px;
    }

    .gcd-related-grid {
        grid-template-columns: 1fr 1fr;
        gap: 14px;
    }

    .gcd-related-card-img {
        height: 120px;
    }

    .gcd-related-card-body {
        padding: 12px;
    }

    .gcd-related-card-title {
        font-size: 14px;
    }

    .gcd-related-card-price {
        font-size: 14px;
    }

    .gcd-related-title {
        font-size: 20px;
    }
}

/* Extra Small */
@media (max-width: 400px) {
    .gcd-related-grid {
        grid-template-columns: 1fr;
    }

    .gcd-related-card {
        display: grid;
        grid-template-columns: 120px 1fr;
    }

    .gcd-related-card-img {
        height: 100%;
        border-radius: 0;
    }

    .gcd-related-card-body {
        display: flex;
        flex-direction: column;
        justify-content: center;
    }
}