:root {
    /* Light Theme Tokens */
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --danger: #ef4444;
    --warning: #f59e0b;
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.5);
    --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.05);
    --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    --modal-overlay: rgba(0, 0, 0, 0.4);
}

[data-theme="dark"] {
    /* Dark Theme Tokens */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --accent: #60a5fa;
    --accent-hover: #93c5fd;
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.05);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
    --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.2);
    --modal-overlay: rgba(0, 0, 0, 0.7);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Vazirmatn', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
    overflow-x: hidden;
    position: relative;
    min-height: 100vh;
}

/* Background Animated Blobs */
.background-effects {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
}

.blob {
    position: absolute;
    filter: blur(80px);
    opacity: 0.5;
    border-radius: 50%;
    animation: float 20s infinite alternate;
}

.blob-1 {
    top: -10%;
    right: -10%;
    width: 50vw;
    height: 50vw;
    background: radial-gradient(circle, rgba(59,130,246,0.3) 0%, rgba(59,130,246,0) 70%);
}

.blob-2 {
    bottom: -10%;
    left: -10%;
    width: 60vw;
    height: 60vw;
    background: radial-gradient(circle, rgba(139,92,246,0.2) 0%, rgba(139,92,246,0) 70%);
    animation-delay: -10s;
}

@keyframes float {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(-50px, 50px) scale(1.1); }
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Glassmorphism Utilities */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
}

/* Header */
.glass-header {
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 15px 0;
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--glass-border);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo i {
    font-size: 2rem;
    color: var(--accent);
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
}

.subtitle {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.actions {
    display: flex;
    gap: 15px;
    align-items: center;
}

.icon-btn {
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    transition: all 0.2s ease;
}

.icon-btn:hover {
    background: var(--glass-border);
    transform: scale(1.1);
}

.github-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--text-primary);
    color: var(--bg-primary);
    padding: 8px 16px;
    border-radius: 20px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.github-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    opacity: 0.9;
}

/* Main Content */
main {
    padding: 40px 0;
}

.search-bar {
    display: flex;
    align-items: center;
    padding: 15px 25px;
    border-radius: 30px;
    margin-bottom: 40px;
    gap: 15px;
    transition: all 0.3s ease;
}

.search-bar:focus-within {
    box-shadow: 0 0 0 2px var(--accent);
}

.search-bar i {
    color: var(--text-secondary);
    font-size: 1.2rem;
}

.search-bar input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
}

.search-bar input::placeholder {
    color: var(--text-secondary);
}

/* Course Grid */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 30px;
}

.course-card {
    border-radius: 20px;
    padding: 25px;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.course-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.1);
    border-color: var(--accent);
}

[data-theme="dark"] .course-card:hover {
    box-shadow: 0 15px 30px rgba(0,0,0,0.4);
}

.course-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 15px;
}

.platform-badge {
    background: var(--bg-primary);
    color: var(--text-secondary);
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 600;
    border: 1px solid var(--glass-border);
}

.course-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 15px;
    line-height: 1.4;
}

.course-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
}

.tag {
    background: rgba(59, 130, 246, 0.1);
    color: var(--accent);
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 0.8rem;
}

.course-footer {
    margin-top: auto;
    border-top: 1px solid var(--glass-border);
    padding-top: 15px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.rating {
    display: flex;
    gap: 4px;
    color: var(--warning);
}

.rating i {
    font-size: 0.9rem;
}

.view-btn {
    color: var(--accent);
    font-weight: 600;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: gap 0.2s ease;
}

.course-card:hover .view-btn {
    gap: 10px;
}

/* Review Snippet */
.review-snippet {
    background: var(--bg-primary);
    padding: 12px;
    border-radius: 12px;
    margin-bottom: 15px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    border: 1px solid var(--glass-border);
    position: relative;
}
.review-snippet::before {
    content: '"';
    position: absolute;
    top: -5px;
    right: 10px;
    font-size: 2rem;
    color: var(--glass-border);
    font-family: serif;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--modal-overlay);
    z-index: 1000;
    backdrop-filter: blur(5px);
    opacity: 0;
    transition: opacity 0.3s ease;
    overflow-y: auto;
    padding: 20px;
}

.modal.show {
    opacity: 1;
}

.modal-content {
    background: var(--bg-secondary);
    margin: 40px auto;
    max-width: 800px;
    border-radius: 24px;
    position: relative;
    transform: translateY(20px);
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    overflow: hidden;
}

.modal.show .modal-content {
    transform: translateY(0);
}

.close-btn {
    position: absolute;
    top: 20px;
    left: 25px; /* RTL */
    font-size: 2rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: color 0.2s;
    z-index: 10;
    line-height: 1;
}

.close-btn:hover {
    color: var(--danger);
}

/* Modal Body Detail */
.modal-header-banner {
    padding: 40px 30px;
    background: linear-gradient(135deg, rgba(59,130,246,0.1) 0%, rgba(139,92,246,0.1) 100%);
    border-bottom: 1px solid var(--glass-border);
}

.modal-header-banner h2 {
    font-size: 1.8rem;
    margin-bottom: 10px;
}

.modal-header-banner .rating {
    font-size: 1.2rem;
    margin-bottom: 20px;
}

.modal-header-banner .rating i {
    font-size: 1.2rem;
}

.author-review-full {
    background: var(--glass-bg);
    padding: 20px;
    border-radius: 16px;
    border: 1px solid var(--glass-border);
    margin-top: 20px;
}

.author-review-full h4 {
    margin-bottom: 10px;
    color: var(--accent);
    display: flex;
    align-items: center;
    gap: 8px;
}

.giscus-section {
    padding: 30px;
}

.giscus-section h3 {
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.giscus-help {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 25px;
}

.setup-guide {
    margin-top: 40px;
    padding: 20px;
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.3);
    border-radius: 16px;
}

.setup-guide h4 {
    color: var(--warning);
    margin-bottom: 15px;
}

.setup-guide ol {
    margin-right: 20px;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.setup-guide li {
    margin-bottom: 8px;
}

.setup-guide a {
    color: var(--accent);
    text-decoration: none;
}

.setup-guide a:hover {
    text-decoration: underline;
}

/* Responsive */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 15px;
        align-items: flex-start;
    }
    .modal-content {
        margin: 10px auto;
        border-radius: 16px;
    }
    .modal-header-banner {
        padding: 30px 20px;
    }
}