:root {
    --primary-color: #0d6efd;
    --secondary-color: #6c757d;
    --bg-color: #f8f9fa;
    --text-color: #212529;
    --card-bg: #ffffff;
    --glass-bg: rgba(255, 255, 255, 0.8);
    --border-color: #dee2e6;
    --transition-speed: 0.3s;
}

[data-theme="dark"] {
    --bg-color: #121212;
    --text-color: #e0e0e0;
    --card-bg: #1e1e1e;
    --glass-bg: rgba(30, 30, 30, 0.8);
    --border-color: #333333;
    --primary-color: #375a7f;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Inter', sans-serif;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

.premium-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 15px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    transition: transform var(--transition-speed);
}

.premium-card:hover {
    transform: translateY(-5px);
}

.glass-nav {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar-brand img {
    height: 40px;
}

.btn-primary {
    background-color: var(--primary-color);
    border: none;
    border-radius: 8px;
    padding: 10px 25px;
    font-weight: 600;
}

.hero-section {
    padding: 100px 0;
    background: linear-gradient(135deg, var(--primary-color), #00d2ff);
    color: white;
    text-align: center;
}

.hero-section h1 {
    font-size: 3.5rem;
    font-weight: 800;
}

.footer {
    padding: 50px 0;
    background: var(--card-bg);
    border-top: 1px solid var(--border-color);
}

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

.animate-fade {
    animation: fadeIn 0.8s ease-out forwards;
}

/* Global Loader Style */
#loader-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--glass-bg);
    backdrop-filter: blur(5px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 10000;
    visibility: hidden;
    opacity: 0;
    transition: all 0.3s ease-in-out;
}

#loader-overlay.show {
    visibility: visible;
    opacity: 1;
}

.loader-spinner {
    width: 50px;
    height: 50px;
    border: 5px solid rgba(13, 110, 253, 0.1);
    border-top: 5px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.loader-text {
    margin-top: 15px;
    font-weight: 600;
    color: var(--primary-color);
    letter-spacing: 1px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}