:root {
    --primary-color: #2563eb;
    --secondary-color: #64748b;
    --accent-color: #f59e0b;
    --success-color: #10b981;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
    min-height: 100vh;
}

.hero-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, #1d4ed8 100%);
    background-size: 400% 400%;
    animation: gradientShift 8s ease infinite;
    color: white;
    padding: 4rem 0 2rem;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg,
            rgba(37, 99, 235, 0.8) 0%,
            rgba(29, 78, 216, 0.9) 25%,
            rgba(59, 130, 246, 0.7) 50%,
            rgba(29, 78, 216, 0.9) 75%,
            rgba(37, 99, 235, 0.8) 100%);
    background-size: 400% 400%;
    animation: gradientFlow 12s ease infinite;
    z-index: 1;
}

.hero-section .container {
    position: relative;
    z-index: 2;
}

@keyframes gradientShift {
    0% {
        background-position: 0% 50%;
    }

    25% {
        background-position: 100% 50%;
    }

    50% {
        background-position: 100% 100%;
    }

    75% {
        background-position: 0% 100%;
    }

    100% {
        background-position: 0% 50%;
    }
}

@keyframes gradientFlow {
    0% {
        background-position: 0% 0%;
    }

    25% {
        background-position: 100% 0%;
    }

    50% {
        background-position: 100% 100%;
    }

    75% {
        background-position: 0% 100%;
    }

    100% {
        background-position: 0% 0%;
    }
}

.main-card {
    background: white;
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    padding: 2rem;
    margin-top: -2rem;
    position: relative;
    z-index: 2;
}

.form-control {
    border-radius: 10px;
    border: 2px solid #e5e7eb;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(37, 99, 235, 0.15);
}

.btn-primary {
    background-color: var(--primary-color);
    border: none;
    border-radius: 10px;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    background-color: #1d4ed8;
    transform: translateY(-1px);
}

.feature-box {
    background: white;
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease;
}

.feature-box:hover {
    transform: translateY(-3px);
}

.feature-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), #1d4ed8);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    color: white;
    font-size: 1.2rem;
}

.ad-space {
    background: linear-gradient(135deg, #fef3c7 0%, #fed7aa 100%);
    border: 2px dashed var(--accent-color);
    border-radius: 10px;
    padding: 1.5rem;
    text-align: center;
    color: #92400e;
    margin: 1.5rem 0;
}

.custom-url-section {
    background: #f8fafc;
    border-radius: 10px;
    padding: 1rem;
    margin: 1rem 0;
    border: 1px solid #e5e7eb;
}

.result-box {
    background: linear-gradient(135deg, #dcfce7 0%, #bbf7d0 100%);
    border: 1px solid var(--success-color);
    border-radius: 10px;
    padding: 1.5rem;
}

.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

.result-box {
    background: #f8f9fa;
    border: 1px solid #dee2e6;
    border-radius: 8px;
    padding: 1.5rem;
}

.error-box {
    background: #f8d7da;
    border: 1px solid #f5c6cb;
    border-radius: 8px;
    padding: 1.5rem;
}