/* Base Styles */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700&display=swap');

:root {
    --primary: #f97316;
    --primary-light: #fb923c;
    --dark: #030712;
    --dark-light: #111827;
    --gray: #6b7280;
    --light: #f9fafb;
}

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

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--dark);
    color: var(--light);
    line-height: 1.6;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
}

/* Buttons */
.btn-primary {
    display: inline-flex;
    align-items: center;
    background: linear-gradient(to right, var(--primary), var(--primary-light));
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(249, 115, 22, 0.25);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    background: transparent;
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.2);
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.3s ease;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.3);
}

.btn-view {
    display: inline-flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.btn-view:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* Hero Section */
.hero {
    position: relative;
    overflow: hidden;
}

/* Branch Cards */
.branch-card {
    perspective: 1000px;
    height: 300px;
    position: relative;
    border-radius: 1rem;
    overflow: hidden;
    transition: transform 0.6s;
    transform-style: preserve-3d;
}

.branch-card:hover {
    transform: rotateY(10deg);
}

.branch-card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.6s;
    transform-style: preserve-3d;
}

.branch-card:hover .branch-card-inner {
    transform: rotateY(180deg);
}

.branch-card-front, .branch-card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 1rem;
    overflow: hidden;
}

.branch-card-front {
    background-color: var(--dark-light);
}

.branch-card-back {
    background: linear-gradient(135deg, var(--dark-light), #1f2937);
    transform: rotateY(180deg);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.branch-card-back h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: white;
}

.branch-card-back p {
    color: var(--gray);
    font-size: 0.9rem;
}

.branch-image {
    position: relative;
    height: 180px;
    overflow: hidden;
}

.branch-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.branch-card:hover .branch-image img {
    transform: scale(1.05);
}

.branch-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to top, rgba(3, 7, 18, 0.9), rgba(3, 7, 18, 0.4));
}

.branch-content {
    padding: 1.5rem;
}

.branch-content h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: white;
}

/* Feature Cards */
.feature-card {
    background: rgba(17, 24, 39, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 1rem;
    padding: 2rem;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
    border-color: rgba(249, 115, 22, 0.3);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(to right, var(--primary), var(--primary-light));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
    color: white;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: white;
}

.feature-card p {
    color: var(--gray);
    font-size: 0.95rem;
}

/* Semester Content */
.semester-card {
    background: rgba(17, 24, 39, 0.7);
    border-radius: 0.75rem;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: all 0.3s ease;
}

.semester-card:hover {
    border-color: rgba(249, 115, 22, 0.3);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.semester-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: white;
    display: flex;
    align-items: center;
}

.semester-card h3::before {
    content: "";
    display: inline-block;
    width: 8px;
    height: 8px;
    background: var(--primary);
    border-radius: 50%;
    margin-right: 0.75rem;
}

.subject {
    background: rgba(31, 41, 55, 0.5);
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    margin-bottom: 0.75rem;
    transition: all 0.3s ease;
}

.subject:hover {
    background: rgba(31, 41, 55, 0.8);
    transform: translateX(5px);
}

.subject p {
    color: white;
    font-weight: 500;
}

.download-link {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
}

.download-link:hover {
    color: var(--primary-light);
}

/* Back to Top Button */
#backToTop.visible {
    opacity: 1;
    visibility: visible;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    animation: fadeIn 0.6s ease forwards;
}

/* Responsive Styles */
@media (max-width: 768px) {
    .hero {
        padding-top: 6rem;
        padding-bottom: 4rem;
    }
    
    .branch-card {
        height: auto;
        perspective: none;
    }
    
    .branch-card-inner {
        transform: none !important;
    }
    
    .branch-card-front, .branch-card-back {
        position: relative;
        transform: none;
        backface-visibility: visible;
    }
    
    .branch-card-back {
        display: none;
    }
    
    .btn-primary, .btn-secondary {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--dark);
}

::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-light);
}

/* Contact Page Styles */
.social-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 50%;
    color: var(--gray);
    font-size: 1.1rem;
    transition: all 0.3s ease;
}

.social-icon:hover {
    background: var(--primary);
    color: white;
    transform: translateY(-3px);
}

/* About Page Styles */
.team-card {
    background: rgba(17, 24, 39, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 1rem;
    overflow: hidden;
    transition: all 0.3s ease;
}

.team-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.team-image {
    height: 250px;
    overflow: hidden;
}

.team-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.team-card:hover .team-image img {
    transform: scale(1.05);
}

.team-content {
    padding: 1.5rem;
}

.team-content h3 {
    font-size: 1.25rem;
    margin-bottom: 0.25rem;
    color: white;
}

/* Resources Page Styles */
.resource-card {
    background: rgba(17, 24, 39, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 1rem;
    padding: 2rem;
    transition: all 0.3s ease;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.resource-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
    border-color: rgba(249, 115, 22, 0.3);
}

.resource-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(to right, var(--primary), var(--primary-light));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
    color: white;
}

.resource-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: white;
}

.resource-link {
    margin-top: auto;
    display: inline-flex;
    align-items: center;
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
}

.resource-link:hover {
    color: var(--primary-light);
    transform: translateX(5px);
}

.popular-resource {
    background: rgba(17, 24, 39, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 1rem;
    padding: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s ease;
}

.popular-resource:hover {
    border-color: rgba(249, 115, 22, 0.3);
    transform: translateY(-3px);
}

.popular-resource h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: white;
}

.download-btn {
    background: rgba(249, 115, 22, 0.1);
    color: var(--primary);
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.3s ease;
    border: 1px solid rgba(249, 115, 22, 0.3);
    white-space: nowrap;
}

.download-btn:hover {
    background: rgba(249, 115, 22, 0.2);
    color: var(--primary-light);
}