:root {
    --primary: #6C63FF;
    --primary-dark: #5a52d5;
    --secondary: #FF6584;
    --dark: #2D3047;
    --light: #F8F9FA;
    --gray: #6C757D;
    --success: #28a745;
    --card-bg: #ffffff;
    --sidebar-bg: linear-gradient(180deg, #2D3047 0%, #3A3F5D 100%);
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    display: flex;
    min-height: 100vh;
    background: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
    color: var(--dark);
    overflow-x: hidden;
}

/* Sidebar Styles */
#sidebar {
    width: 280px;
    background: var(--sidebar-bg);
    color: white;
    transition: var(--transition);
    box-shadow: var(--shadow);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    transform: translateX(0);
}

.sidebar-header {
    padding: 25px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(0, 0, 0, 0.2);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.logo {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    object-fit: cover;
    border: 2px solid var(--primary);
}

.sidebar-header h2 {
    font-size: 1.8rem;
    font-weight: 700;
    color: white;
    margin: 0;
}

.sidebar-toggle {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
}

.sidebar-menu {
    list-style: none;
    padding: 20px 0;
    flex-grow: 1;
}

.menu-item {
    display: flex;
    align-items: center;
    padding: 15px 25px;
    color: white;
    text-decoration: none;
    transition: var(--transition);
    border-left: 4px solid transparent;
    margin: 5px 0;
}

.menu-item i {
    margin-right: 12px;
    font-size: 1.2rem;
    width: 24px;
    text-align: center;
}

.menu-item:hover {
    background: rgba(255, 255, 255, 0.1);
    border-left: 4px solid var(--primary);
    padding-left: 30px;
}

.menu-item.active {
    background: rgba(108, 99, 255, 0.2);
    border-left: 4px solid var(--primary);
    color: white;
}

.sidebar-footer {
    padding: 20px;
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.8rem;
    opacity: 0.7;
}

/* Main Content Styles */
#mainContent {
    flex: 1;
    padding: 30px;
    overflow-y: auto;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100" viewBox="0 0 100 100"><rect width="100" height="100" fill="%23f5f7fa"/><path d="M0 0L100 100M100 0L0 100" stroke="%23e4edf5" stroke-width="1"/></svg>');
    margin-left: 280px;
    min-height: 100vh;
}

.page {
    display: none;
    animation: fadeIn 0.5s ease;
    max-width: 1200px;
    margin: 0 auto;
}

.page.active {
    display: block;
}

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

.page-header {
    margin-bottom: 30px;
    text-align: center;
}

.page-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(to right, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 10px;
}

.page-header p {
    color: var(--gray);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* Search Section Styles */
.search-container {
    display: flex;
    margin-bottom: 30px;
    max-width: 600px;
    margin: 0 auto 40px;
    box-shadow: var(--shadow);
    border-radius: 50px;
    overflow: hidden;
}

#subjectCode {
    flex: 1;
    padding: 18px 25px;
    border: none;
    background: var(--card-bg);
    font-size: 1.1rem;
    outline: none;
}

#searchBtn {
    padding: 0 35px;
    background: linear-gradient(to right, var(--primary), var(--primary-dark));
    color: white;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
}

#searchBtn:hover {
    background: linear-gradient(to right, var(--primary-dark), var(--primary));
}

.result-container {
    max-width: 600px;
    margin: 0 auto;
}

.success-message {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 15px;
    box-shadow: var(--shadow);
    text-align: center;
    border-left: 5px solid var(--success);
}

.download-btn {
    display: inline-flex;
    align-items: center;
    padding: 15px 30px;
    background: linear-gradient(to right, var(--success), #20c997);
    color: white;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    margin-top: 20px;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(40, 167, 69, 0.3);
    gap: 8px;
}

.download-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(40, 167, 69, 0.4);
}

.error-message {
    color: #e74c3c;
    margin-top: 10px;
    padding: 20px;
    background: #ffeaea;
    border-radius: 10px;
    text-align: center;
    border-left: 5px solid #e74c3c;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

/* Groups Section Styles */
.groups-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 25px;
    margin-top: 30px;
}

/* Channel Card Container */
.channel-card-container {
    display: flex;
    justify-content: center;
    margin-bottom: 40px;
}

.channel-card {
    max-width: 400px;
    width: 100%;
    padding: 35px;
}

.channel-logo-container {
    margin-bottom: 25px;
    display: flex;
    justify-content: center;
}

.channel-logo-large {
    width: 120px;
    height: 120px;
    border-radius: 20px;
    object-fit: cover;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
    transition: var(--transition);
}

.channel-card:hover .channel-logo-large {
    transform: scale(1.05);
    box-shadow: 0 12px 35px rgba(0, 0, 0, 0.2);
}

.group-card {
    background: var(--card-bg);
    border-radius: 15px;
    padding: 25px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    cursor: pointer;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.group-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: linear-gradient(to right, var(--primary), var(--secondary));
}

.group-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.group-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: white;
    font-size: 1.8rem;
}

.group-card h3 {
    color: var(--dark);
    margin-bottom: 10px;
    font-size: 1.4rem;
}

.group-card p {
    color: var(--gray);
    margin-bottom: 20px;
}

.group-link {
    display: inline-flex;
    align-items: center;
    color: var(--primary);
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    gap: 5px;
}

.group-card:hover .group-link {
    gap: 8px;
}

/* About Section - Enhanced Styles */
.about-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 30px;
    margin-top: 30px;
}

/* Special Thanks Card - Premium Design */
.special-thanks-card {
    background: linear-gradient(135deg, var(--card-bg) 0%, #f8f9ff 100%);
    border-radius: 20px;
    padding: 0;
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(108, 99, 255, 0.1);
}

.special-thanks-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(to right, var(--primary), var(--secondary), #ff9a44);
}

.thanks-header {
    padding: 30px 30px 20px;
    text-align: center;
    background: linear-gradient(135deg, rgba(108, 99, 255, 0.05) 0%, rgba(255, 101, 132, 0.05) 100%);
}

.trophy-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, #FFD700, #FFA500);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 15px;
    color: white;
    font-size: 1.8rem;
    box-shadow: 0 8px 20px rgba(255, 165, 0, 0.3);
}

.thanks-header h2 {
    color: var(--dark);
    margin-bottom: 15px;
    font-size: 1.8rem;
    font-weight: 700;
}

.decoration-line {
    width: 60px;
    height: 3px;
    background: linear-gradient(to right, var(--primary), var(--secondary));
    margin: 0 auto;
    border-radius: 2px;
}

.thanks-content {
    padding: 0 30px 30px;
}

.person-highlight {
    margin: 25px 0;
}

.avatar-container {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 20px;
    background: rgba(108, 99, 255, 0.05);
    border-radius: 15px;
    border-left: 4px solid var(--primary);
}

.avatar {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    box-shadow: 0 5px 15px rgba(108, 99, 255, 0.3);
}

.person-info h3 {
    color: var(--dark);
    margin-bottom: 5px;
    font-size: 1.4rem;
}

.role {
    color: var(--primary);
    font-weight: 600;
    font-size: 0.9rem;
}

.contribution-details {
    margin: 25px 0;
}

.main-quote {
    font-style: italic;
    color: var(--gray);
    text-align: center;
    padding: 15px;
    background: rgba(108, 99, 255, 0.03);
    border-radius: 10px;
    margin-bottom: 20px;
    border-left: 3px solid var(--primary);
    font-size: 1.1rem;
}

.contribution-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.contribution-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 15px;
    background: rgba(40, 167, 69, 0.05);
    border-radius: 8px;
    border-left: 3px solid var(--success);
}

.contribution-item i {
    color: var(--success);
    font-size: 1.1rem;
}

.contribution-item span {
    color: var(--dark);
    font-weight: 500;
}

.impact-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
    margin-top: 25px;
    padding: 20px;
    background: linear-gradient(135deg, rgba(108, 99, 255, 0.05) 0%, rgba(255, 101, 132, 0.05) 100%);
    border-radius: 15px;
}

.stat {
    text-align: center;
    padding: 15px;
}

.stat-number {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 5px;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--gray);
    font-weight: 500;
}

/* Development Card - Enhanced */
.credit-card {
    background: linear-gradient(135deg, var(--card-bg) 0%, #f8f9ff 100%);
    border-radius: 20px;
    padding: 0;
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(108, 99, 255, 0.1);
}

.credit-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(to right, #ff9a44, var(--secondary), var(--primary));
}

.dev-header {
    padding: 30px 30px 20px;
    text-align: center;
    background: linear-gradient(135deg, rgba(255, 101, 132, 0.05) 0%, rgba(108, 99, 255, 0.05) 100%);
}

.heart-pulse {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--secondary), #ff6b9c);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 15px;
    color: white;
    font-size: 1.8rem;
    box-shadow: 0 8px 20px rgba(255, 101, 132, 0.3);
    animation: heartbeat 1.5s ease infinite;
}

.dev-header h2 {
    color: var(--dark);
    margin-bottom: 15px;
    font-size: 1.8rem;
    font-weight: 700;
}

.dev-content {
    padding: 0 30px 30px;
}

.developer-info {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 25px 20px;
    background: rgba(255, 101, 132, 0.05);
    border-radius: 15px;
    margin: 20px 0;
    border-left: 4px solid var(--secondary);
}

.dev-avatar {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--secondary), #ff6b9c);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    box-shadow: 0 5px 15px rgba(255, 101, 132, 0.3);
}

.dev-details h3 {
    color: var(--dark);
    margin-bottom: 5px;
    font-size: 1.4rem;
}

.dev-details p {
    color: var(--secondary);
    font-weight: 600;
    font-size: 0.9rem;
}

.contact-section {
    margin: 25px 0;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 15px 20px;
    margin-bottom: 12px;
    background: rgba(108, 99, 255, 0.05);
    border-radius: 10px;
    transition: var(--transition);
    border-left: 3px solid transparent;
}

.contact-item:hover {
    background: rgba(108, 99, 255, 0.08);
    border-left: 3px solid var(--primary);
    transform: translateX(5px);
}

.contact-item i {
    width: 20px;
    text-align: center;
    color: var(--primary);
    font-size: 1.2rem;
}

.contact-details {
    display: flex;
    flex-direction: column;
}

.contact-label {
    font-size: 0.8rem;
    color: var(--gray);
    margin-bottom: 2px;
}

.contact-value {
    font-weight: 600;
    color: var(--dark);
}

.support-text {
    text-align: center;
    color: var(--gray);
    font-style: italic;
    padding: 15px;
    background: rgba(108, 99, 255, 0.03);
    border-radius: 10px;
    margin-top: 20px;
}

/* Enhanced Animations */
@keyframes heartbeat {
    0% { transform: scale(1); }
    5% { transform: scale(1.1); }
    10% { transform: scale(1); }
    15% { transform: scale(1.1); }
    20% { transform: scale(1); }
    100% { transform: scale(1); }
}

/* Responsive Design */
@media (max-width: 1024px) {
    .groups-container {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    }
    
    .about-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    body {
        flex-direction: column;
    }
    
    #sidebar {
        width: 100%;
        height: auto;
        position: relative;
        transform: translateX(0);
    }
    
    .sidebar-toggle {
        display: block;
    }
    
    .sidebar-menu {
        display: none;
    }
    
    .sidebar-menu.active {
        display: block;
    }
    
    #mainContent {
        margin-left: 0;
        padding: 20px;
    }
    
    .page-header h1 {
        font-size: 2rem;
    }
    
    .search-container {
        flex-direction: column;
        border-radius: 15px;
    }
    
    #subjectCode {
        padding: 15px 20px;
        border-radius: 15px 15px 0 0;
    }
    
    #searchBtn {
        padding: 15px;
        border-radius: 0 0 15px 15px;
        justify-content: center;
    }
    
    .groups-container {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .channel-card {
        max-width: 100%;
        padding: 25px;
    }
    
    .channel-logo-large {
        width: 100px;
        height: 100px;
    }
    
    .about-container {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .special-thanks-card, .credit-card {
        margin: 0;
    }
    
    .thanks-header, .dev-header {
        padding: 25px 20px 15px;
    }
    
    .thanks-content, .dev-content {
        padding: 0 20px 25px;
    }
    
    .avatar-container, .developer-info {
        flex-direction: column;
        text-align: center;
        gap: 12px;
    }
    
    .impact-stats {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    
    .stat {
        padding: 10px;
    }
    
    .stat-number {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    #mainContent {
        padding: 15px;
    }
    
    .page-header h1 {
        font-size: 1.8rem;
    }
    
    .page-header p {
        font-size: 1rem;
    }
    
    .about-container {
        grid-template-columns: 1fr;
    }
    
    .trophy-icon, .heart-pulse {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
    }
    
    .thanks-header h2, .dev-header h2 {
        font-size: 1.5rem;
    }
    
    .avatar, .dev-avatar {
        width: 50px;
        height: 50px;
        font-size: 1.3rem;
    }
    
    .person-info h3, .dev-details h3 {
        font-size: 1.2rem;
    }
    
    .main-quote {
        font-size: 1rem;
    }
    
    .group-card {
        padding: 20px;
    }
    
    .group-icon {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
    }
    
    .channel-logo-large {
        width: 80px;
        height: 80px;
    }
    
    .group-card h3 {
        font-size: 1.2rem;
    }
    
    .success-message, .error-message {
        padding: 20px;
    }
    
    .download-btn {
        padding: 12px 25px;
        font-size: 0.9rem;
    }
}

/* Mobile Sidebar Toggle */
@media (max-width: 768px) {
    #sidebar {
        height: auto;
        min-height: auto;
    }
    
    .sidebar-header {
        padding: 15px 20px;
    }
    
    .sidebar-menu {
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
    }
    
    .sidebar-menu.active {
        max-height: 300px;
    }
    
    .sidebar-footer {
        display: none;
    }
}