body {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.main-container {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    margin: 20px auto;
    max-width: 1200px;
}

.header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 30px;
    border-radius: 20px 20px 0 0;
    text-align: center;
}

.logo-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 20px;
}

.logo-icon {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.3);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

.logo-icon i {
    font-size: 2.5rem;
    color: white;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.logo-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    text-align: left;
}

.brand-name {
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -1px;
    background: linear-gradient(45deg, #ffffff 0%, #f0f0f0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    line-height: 1;
}

.brand-subtitle {
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 3px;
    color: rgba(255, 255, 255, 0.8);
    margin-top: -5px;
    text-transform: uppercase;
}

@media (max-width: 768px) {
    .logo-container {
        flex-direction: column;
        gap: 10px;
    }
    
    .logo-text {
        align-items: center;
        text-align: center;
    }
    
    .brand-name {
        font-size: 2rem;
    }
    
    .logo-icon {
        width: 60px;
        height: 60px;
    }
    
    .logo-icon i {
        font-size: 2rem;
    }
}

.tool-card {
    background: white;
    border-radius: 15px;
    padding: 25px;
    margin: 15px 0;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.tool-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

.tool-icon {
    font-size: 2.5rem;
    margin-bottom: 15px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    border-radius: 10px;
    padding: 12px 30px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.form-control, .form-select {
    border-radius: 10px;
    border: 2px solid #e9ecef;
    padding: 12px 15px;
    transition: border-color 0.3s ease;
}

.form-control:focus, .form-select:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
}

.ad-space {
    background: #f8f9fa;
    border: 2px dashed #dee2e6;
    border-radius: 10px;
    padding: 20px;
    text-align: center;
    margin: 20px 0;
    min-height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #6c757d;
}

.result-box {
    background: #f8f9fa;
    border-radius: 10px;
    padding: 15px;
    margin-top: 15px;
    border-left: 4px solid #667eea;
}

.nav-tabs {
    border-bottom: none;
}

.nav-tabs .nav-link {
    border-radius: 10px 10px 0 0;
    border: none;
    color: #6c757d;
    font-weight: 600;
    margin-right: 5px;
}

.nav-tabs .nav-link.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.tab-content {
    background: white;
    border-radius: 0 10px 10px 10px;
    padding: 25px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
}

.copy-btn {
    position: relative;
    top: -2px;
    margin-left: 10px;
}

.footer {
    background: #343a40;
    color: white;
    padding: 20px;
    text-align: center;
    border-radius: 0 0 20px 20px;
}