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

body {
    font-family: 'Inter', sans-serif;
    background: #03060b;
    color: #e0e0e0;
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px 30px;
}

/* Header */
.header {
    margin-bottom: 40px;
}

.nav-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
    border-bottom: 1px solid rgba(13, 110, 253, 0.2);
    margin-bottom: 25px;
    flex-wrap: wrap;
    gap: 15px;
}

.back-link {
    color: #0d6efd;
    text-decoration: none;
    font-weight: 500;
    transition: 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: rgba(13, 110, 253, 0.1);
    border-radius: 40px;
    border: 1px solid transparent;
}

.back-link:hover {
    background: rgba(13, 110, 253, 0.15);
    border-color: rgba(13, 110, 253, 0.4);
    transform: translateX(-3px);
}

.logo-small {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.02);
    padding: 6px 16px;
    border-radius: 40px;
    border: 1px solid rgba(13, 110, 253, 0.2);
}

.logo-small .logo-text {
    font-size: 1.1rem;
    font-weight: 700;
    background: linear-gradient(145deg, #fff, #6ea5ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-small .logo-badge {
    background: #0d6efd;
    color: #03060b;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: 30px;
    font-size: 0.75rem;
    letter-spacing: 0.5px;
}

.title-section {
    display: flex;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
}

.title-icon {
    font-size: 2.5rem;
    color: #0d6efd;
    background: rgba(13, 110, 253, 0.1);
    width: 70px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 25px;
    border: 1px solid rgba(13, 110, 253, 0.3);
}

.title-text h1 {
    font-size: 2.2rem;
    font-weight: 700;
    background: linear-gradient(to right, #fff, #a0c0ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 5px;
}

.subtitle {
    color: #b0b0b0;
    font-size: 1rem;
}

/* Language Grid */
.lang-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 25px;
    margin-bottom: 50px;
}

@media (max-width: 900px) {
    .lang-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 500px) {
    .lang-grid {
        grid-template-columns: 1fr;
    }
}

.lang-card {
    background: rgba(8, 18, 28, 0.7);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(13, 110, 253, 0.2);
    border-radius: 30px;
    padding: 30px 25px;
    text-decoration: none;
    color: inherit;
    position: relative;
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
}

.card-glow {
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at center, rgba(13, 110, 253, 0.2), transparent 70%);
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none;
}

.lang-card:hover {
    transform: translateY(-8px);
    border-color: #0d6efd;
    box-shadow: 0 20px 30px -10px rgba(13, 110, 253, 0.4);
}

.lang-card:hover .card-glow {
    opacity: 1;
}

.lang-icon {
    font-size: 3rem;
    margin-bottom: 20px;
    transition: all 0.3s;
}

.lang-card:hover .lang-icon {
    transform: scale(1.1) rotate(5deg);
}

.java-icon {
    color: #f89820;
}

.python-icon {
    color: #3776ab;
}

.c-icon {
    color: #555555;
}

.rust-icon {
    color: #dea584;
}

.lang-card h3 {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 10px;
    background: linear-gradient(135deg, #fff, #b0d0ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.lang-description {
    color: #b0b0b0;
    margin-bottom: 20px;
    font-size: 0.9rem;
    line-height: 1.6;
    flex: 1;
}

.lang-topics {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 15px;
}

.lang-topics span {
    background: rgba(13, 110, 253, 0.1);
    border: 1px solid rgba(13, 110, 253, 0.2);
    padding: 4px 12px;
    border-radius: 30px;
    font-size: 0.75rem;
    color: #0d6efd;
}

.lang-stats {
    display: flex;
    justify-content: space-between;
    margin-bottom: 20px;
    font-size: 0.8rem;
    color: #888;
}

.lang-stats i {
    margin-right: 5px;
    color: #0d6efd;
}

.lang-footer {
    display: flex;
    align-items: center;
    gap: 8px;
    color: #0d6efd;
    font-weight: 600;
    transition: all 0.2s;
    margin-top: auto;
}

.lang-card:hover .lang-footer {
    color: #fff;
    transform: translateX(5px);
}

/* Info Section */
.info-section {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 40px;
}

@media (max-width: 700px) {
    .info-section {
        grid-template-columns: 1fr;
    }
}

.info-card {
    background: rgba(13, 110, 253, 0.05);
    border: 1px solid rgba(13, 110, 253, 0.15);
    border-radius: 20px;
    padding: 25px 20px;
    display: flex;
    align-items: center;
    gap: 15px;
    transition: all 0.3s;
}

.info-card:hover {
    border-color: #0d6efd;
    transform: translateY(-3px);
    background: rgba(13, 110, 253, 0.1);
}

.info-card i {
    font-size: 2rem;
    color: #0d6efd;
}

.info-content h4 {
    color: #fff;
    font-size: 1rem;
    margin-bottom: 5px;
}

.info-content p {
    color: #b0b0b0;
    font-size: 0.85rem;
}

/* Footer */
.footer {
    text-align: center;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid rgba(13, 110, 253, 0.2);
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 25px;
    margin-bottom: 15px;
    flex-wrap: wrap;
}

.footer-link {
    color: #888;
    text-decoration: none;
    transition: all 0.2s;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 5px;
}

.footer-link:hover {
    color: #0d6efd;
    transform: translateY(-2px);
}

.copyright {
    color: #666;
    font-size: 0.85rem;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .title-section {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .title-text h1 {
        font-size: 1.8rem;
    }
    
    .lang-card h3 {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .nav-top {
        flex-direction: column;
    }
    
    .back-link {
        width: 100%;
        justify-content: center;
    }
    
    .logo-small {
        width: 100%;
        justify-content: center;
    }
}
/* Folder Structure */
.folder-structure {
    background: rgba(13, 110, 253, 0.05);
    border: 1px solid rgba(13, 110, 253, 0.15);
    border-radius: 20px;
    padding: 25px;
    margin: 40px 0;
}

.folder-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
    color: #0d6efd;
    font-size: 1.2rem;
}

.folder-header i {
    font-size: 1.5rem;
}

.folder-content {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
}

@media (max-width: 600px) {
    .folder-content {
        grid-template-columns: 1fr;
    }
}

.folder-item {
    background: rgba(13, 110, 253, 0.1);
    border: 1px solid rgba(13, 110, 253, 0.2);
    border-radius: 12px;
    padding: 12px 15px;
    color: #fff;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.95rem;
}

.folder-item i {
    color: #0d6efd;
}

.folder-path {
    color: #888;
    font-size: 0.8rem;
    margin-left: auto;
}