:root {
    --gz-header-max: 720px;
}

.gz-courses-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-3xl, 4rem) var(--space-lg, 1.5rem);
}

.gz-classroom-header {
    text-align: center;
    margin-bottom: var(--space-3xl, 4rem);
    position: relative;
    overflow: hidden;
}

.gz-header-background {
    position: absolute;
    top: -50px;
    left: 50%;
    width: 220px;
    height: 220px;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--color-accent, #6366f1) 0%, var(--color-accent-light, #818cf8) 100%);
    border-radius: 50%;
    opacity: 0.09;
    filter: blur(5px);
    z-index: -1;
}

.gz-header-icon {
    font-size: clamp(3rem, 6vw, 4.5rem);
    margin-bottom: var(--space-lg, 1.5rem);
    background: linear-gradient(135deg, var(--color-accent, #6366f1), var(--color-accent-light, #818cf8));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.gz-page-title {
    font-family: var(--font-display, 'Poppins', sans-serif);
    font-size: clamp(2.5rem, 6vw, 3.5rem);
    font-weight: 800;
    margin-bottom: var(--space-sm, 0.5rem);
    background: linear-gradient(135deg, var(--color-text-primary, #1f2937), var(--color-accent, #6366f1));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.gz-page-subtitle {
    color: var(--color-text-secondary, #6b7280);
    font-size: 1.125rem;
    margin: 0 auto var(--space-2xl, 3rem);
    max-width: var(--gz-header-max);
}

.gz-stats-bar {
    display: flex;
    justify-content: center;
    gap: var(--space-2xl, 3rem);
    flex-wrap: wrap;
}

.gz-stat-item {
    min-width: 160px;
    padding: var(--space-md, 1rem) var(--space-xl, 2rem);
    border-radius: var(--radius-xl, 1rem);
    text-align: center;
    background: var(--color-white, #fff);
    box-shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
    border: 1px solid var(--color-border-light, #f3f4f6);
}

.gz-stat-item--accent .gz-stat-number { color: var(--color-accent, #6366f1); }
.gz-stat-item--success .gz-stat-number { color: var(--color-success, #10b981); }
.gz-stat-item--warning .gz-stat-number { color: var(--color-warning, #f59e0b); }

.gz-stat-number {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.gz-stat-label {
    font-size: 0.875rem;
    color: var(--color-text-secondary, #6b7280);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.gz-tabs-wrapper {
    background: var(--color-white, #fff);
    border-radius: var(--radius-xl, 1rem);
    padding: var(--space-xs, 0.5rem);
    margin-bottom: var(--space-2xl, 3rem);
    box-shadow: 0 10px 25px rgba(15, 23, 42, 0.08);
}

.gz-tabs {
    position: relative;
    display: flex;
    gap: var(--space-xs, 0.5rem);
}

.gz-tab-indicator {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--color-accent, #6366f1), var(--color-accent-light, #818cf8));
    border-radius: var(--radius-lg, 0.75rem);
    transition: transform 0.4s ease, width 0.4s ease;
    pointer-events: none;
}

.gz-tab-btn {
    flex: 1;
    padding: var(--space-md, 1rem);
    border: none;
    background: none;
    position: relative;
    z-index: 1;
    border-radius: var(--radius-lg, 0.75rem);
    font-weight: 600;
    color: var(--color-text-secondary, #6b7280);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    cursor: pointer;
    transition: color 0.2s ease;
}

.gz-tab-btn.active {
    color: var(--color-white, #fff);
}

.gz-tab-btn:not(.active):focus-visible,
.gz-tab-btn:not(.active):hover {
    color: var(--color-accent, #6366f1);
}

.gz-tab-icon {
    flex-shrink: 0;
}

.gz-courses-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: var(--space-2xl, 3rem);
}

.loading-state,
.error-state,
.gz-empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: var(--space-3xl, 4rem) var(--space-lg, 1.5rem);
    background: var(--color-white, #fff);
    border-radius: var(--radius-2xl, 1.5rem);
    box-shadow: 0 15px 35px rgba(15, 23, 42, 0.08);
    color: var(--color-text-secondary, #6b7280);
}

.gz-loading-animation {
    font-size: 4rem;
    margin-bottom: var(--space-lg, 1.5rem);
    animation: pulse 2s infinite ease-in-out;
}

.gz-loading-dots {
    display: flex;
    justify-content: center;
    gap: 6px;
}

.gz-loading-dots span {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--color-accent, #6366f1);
    animation: bounce 1.4s infinite both;
}

.gz-loading-dots span:nth-child(2) { animation-delay: 0.2s; }
.gz-loading-dots span:nth-child(3) { animation-delay: 0.4s; }

.gz-course-card {
    background: var(--color-white, #fff);
    border-radius: var(--radius-xl, 1rem);
    border: 1px solid var(--color-border-light, #f3f4f6);
    overflow: hidden;
    position: relative;
    box-shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1),
        box-shadow 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    opacity: 0;
    transform: translateY(30px);
}

.gz-course-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-accent, #6366f1), var(--color-accent-light, #818cf8));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.35s ease;
}

.gz-course-card.animated {
    opacity: 1;
    transform: translateY(0);
    animation: slideInUp 0.6s ease forwards;
}

.gz-course-card:hover {
    transform: translateY(-8px) scale(1.01);
    box-shadow: 0 25px 50px rgba(15, 23, 42, 0.15);
}

.gz-course-card:hover::before {
    transform: scaleX(1);
}

.gz-course-thumbnail {
    position: relative;
    width: 100%;
    height: 240px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea, #764ba2);
    overflow: hidden;
}

.gz-course-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.gz-course-card:hover .gz-course-thumbnail img {
    transform: scale(1.05);
}

.gz-course-thumbnail::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent, rgba(15, 23, 42, 0.4));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.gz-course-card:hover .gz-course-thumbnail::after {
    opacity: 1;
}

.gz-placeholder {
    font-size: 4.5rem;
    color: rgb(255 255 255 / 0.85);
    transition: transform 0.3s ease;
}

.gz-course-card:hover .gz-placeholder {
    transform: scale(1.08);
}

.gz-status-badge {
    position: absolute;
    top: 16px;
    right: 16px;
    padding: 6px 16px;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
    background: rgba(255, 255, 255, 0.95);
    color: var(--color-text-primary, #1f2937);
    border: 2px solid transparent;
    backdrop-filter: blur(10px);
    box-shadow: 0 8px 20px rgba(15, 23, 42, 0.12);
    transition: transform 0.3s ease;
}

.gz-status-badge.enrolled {
    background: linear-gradient(135deg, var(--color-success, #10b981), #059669);
    color: #fff;
    border-color: rgb(255 255 255 / 0.2);
}

.gz-course-card:hover .gz-status-badge {
    transform: translateY(-2px) scale(1.03);
}

.gz-course-content {
    padding: var(--space-xl, 2rem);
}

.gz-course-header {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.gz-category,
.gz-level {
    display: inline-flex;
    align-items: center;
    padding: 6px 14px;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
    background: var(--color-accent-subtle, #eef2ff);
    border: 1px solid var(--color-accent-light, #818cf8);
    color: var(--color-accent, #6366f1);
    letter-spacing: 0.04em;
}

.gz-course-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin: 1rem 0 0.5rem;
    color: var(--color-text-primary, #1f2937);
    transition: color 0.2s ease;
}

.gz-course-card:hover .gz-course-title {
    color: var(--color-accent, #6366f1);
}

.gz-course-description {
    color: var(--color-text-secondary, #6b7280);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 1.5rem;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    line-clamp: 3;
    overflow: hidden;
}

.gz-course-meta {
    display: flex;
    gap: 1.25rem;
    flex-wrap: wrap;
    margin-bottom: 1.25rem;
}

.gz-meta-item {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--color-text-secondary, #6b7280);
    font-size: 0.85rem;
    font-weight: 500;
}

.gz-meta-item svg {
    color: var(--color-accent, #6366f1);
}

.gz-progress-bar {
    height: 8px;
    background: var(--color-border-light, #f3f4f6);
    border-radius: 999px;
    overflow: hidden;
    margin-bottom: 0.75rem;
    position: relative;
}

.gz-progress-bar::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, transparent, rgb(255 255 255 / 0.4), transparent);
    animation: shimmer 2s infinite;
}

.gz-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-accent, #6366f1), var(--color-accent-light, #818cf8));
    transition: width 0.4s ease;
}

.gz-progress-text {
    font-size: 0.85rem;
    color: var(--color-text-secondary, #6b7280);
    font-weight: 500;
    margin-bottom: 1rem;
}

.gz-course-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--color-border-light, #f3f4f6);
}

.gz-instructor {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.gz-instructor-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-accent, #6366f1), var(--color-accent-light, #818cf8));
    color: #fff;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 10px 20px rgba(99, 102, 241, 0.25);
}

.gz-instructor-name {
    font-weight: 600;
    color: var(--color-text-primary, #1f2937);
}

.gz-view-btn {
    position: relative;
    padding: 0.85rem 1.75rem;
    border: none;
    border-radius: 0.85rem;
    font-weight: 600;
    font-size: 0.95rem;
    color: #fff;
    background: linear-gradient(135deg, var(--color-accent, #6366f1), var(--color-accent-light, #818cf8));
    cursor: pointer;
    overflow: hidden;
    box-shadow: 0 15px 30px rgba(99, 102, 241, 0.35);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.gz-view-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, transparent, rgb(255 255 255 / 0.35), transparent);
    transform: translateX(-100%);
    transition: transform 0.5s ease;
}

.gz-view-btn:hover::before {
    transform: translateX(100%);
}

.gz-view-btn:hover {
    transform: translateY(-3px) translateX(3px);
    box-shadow: 0 25px 40px rgba(99, 102, 241, 0.45);
}

.gz-empty-state .empty-icon {
    font-size: 4rem;
    opacity: 0.8;
    margin-bottom: 1rem;
}

.gz-empty-state h3 {
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
    color: var(--color-text-primary, #1f2937);
}

.gz-empty-state p {
    max-width: 420px;
    margin: 0 auto;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.05); opacity: 0.8; }
}

@keyframes bounce {
    0%, 80%, 100% { transform: scale(0); }
    40% { transform: scale(1); }
}

@keyframes slideInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

@media (max-width: 1024px) {
    .gz-courses-list {
        grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    }
}

@media (max-width: 768px) {
    .gz-courses-container {
        padding: var(--space-2xl, 3rem) var(--space-md, 1rem);
    }

    .gz-stats-bar {
        gap: var(--space-lg, 1.5rem);
    }

    .gz-tabs {
        overflow-x: auto;
        padding-bottom: 0.25rem;
    }

    .gz-tab-btn {
        flex: none;
        min-width: 200px;
    }

    .gz-courses-list {
        grid-template-columns: 1fr;
        gap: var(--space-xl, 2rem);
    }

    .gz-course-thumbnail { height: 200px; }

    .gz-course-footer {
        flex-direction: column;
        align-items: stretch;
    }

    .gz-view-btn { width: 100%; }
}

@media (max-width: 480px) {
    .gz-page-title { font-size: 2.25rem; }
    .gz-stats-bar { gap: var(--space-md, 1rem); }
    .gz-stat-number { font-size: 1.5rem; }
}