:root {
    --bg-primary: #0f1419;
    --bg-secondary: #1a1f2e;
    --bg-tertiary: #252a3a;
    --text-primary: #e6e8eb;
    --text-secondary: #9ca3af;
    --accent-blue: #00d4ff;
    --accent-purple: #8b5cf6;
    --border-color: #374151;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --glass-bg: rgba(26, 31, 46, 0.8);
}

[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #e2e8f0;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #cbd5e1;
    --glass-bg: rgba(248, 250, 252, 0.9);
}

* {
    box-sizing: border-box;
}

body {
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    color: var(--text-primary);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    min-height: 100vh;
    margin: 0;
    transition: all 0.3s ease;
}

.login-page {
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 50%, var(--bg-tertiary) 100%);
}

.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    transition: all 0.3s ease;
}

.glass-card:hover {
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
    transform: translateY(-2px);
}

/* Bootstrap overrides */
.btn-primary {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    border: none;
    border-radius: 12px;
    font-weight: 600;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 212, 255, 0.3);
    background: linear-gradient(135deg, #00b8e6, #7c3aed);
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.btn-primary:hover::before {
    left: 100%;
}

.form-control, .form-select {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 12px;
    transition: all 0.3s ease;
    padding: 12px 16px;
}

.form-control:focus, .form-select:focus {
    background: var(--bg-tertiary);
    border-color: var(--accent-blue);
    color: var(--text-primary);
    box-shadow: 0 0 0 0.2rem rgba(0, 212, 255, 0.25);
}

.form-control::placeholder {
    color: var(--text-secondary);
}

.input-group-text {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    border-radius: 12px 0 0 12px;
}

.navbar {
    background: var(--glass-bg) !important;
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
}

.navbar-brand {
    color: var(--text-primary) !important;
    font-size: 1.5rem;
}

.download-item {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

.download-item:hover {
    border-color: var(--accent-blue);
    transform: translateY(-4px);
    box-shadow: 0 12px 30px rgba(0, 212, 255, 0.15);
}

.download-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s ease;
}

.download-item:hover::before {
    transform: scaleX(1);
}

.category-section {
    position: relative;
}

.category-section::before {
    content: '';
    position: absolute;
    left: 0;
    top: 40px;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--accent-blue), transparent);
}

/* Theme toggle */
.theme-toggle-container {
    position: relative;
}

#themeToggle {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 50px;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

#themeToggle:hover {
    background: var(--accent-blue);
    color: white;
    transform: rotate(180deg);
}

/* Loading animations */
.loading-spinner {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Alerts */
.alert {
    border: none;
    border-radius: 12px;
    backdrop-filter: blur(10px);
}

.alert-success {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid var(--success);
    color: var(--success);
}

.alert-danger {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--danger);
    color: var(--danger);
}

.alert-info {
    background: rgba(0, 212, 255, 0.1);
    border: 1px solid var(--accent-blue);
    color: var(--accent-blue);
}

/* Dropdown customization */
.dropdown-menu {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.dropdown-item {
    color: var(--text-primary);
    transition: all 0.3s ease;
}

.dropdown-item:hover {
    background: var(--bg-tertiary);
    color: var(--accent-blue);
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .container {
        padding-left: 15px;
        padding-right: 15px;
    }
    
    .glass-card {
        margin: 10px;
    }
    
    .download-item {
        margin-bottom: 15px;
    }
    
    #clientSelector {
        width: 150px !important;
        font-size: 0.9rem;
    }
}

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

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

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

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-blue);
}