:root {
    --primary-color: #4361ee;
    --secondary-color: #3f37c9;
    --accent-color: #4cc9f0;
    --dark-color: #2b2d42;
    --light-color: #f8f9fa;
    --success-color: #4CAF50;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f8f9fa;
    color: var(--dark-color);
    line-height: 1.6;
}

.navbar {
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 1rem 2rem;
    background: white;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--primary-color);
}

.navbar-brand i {
    margin-right: 8px;
}

.nav-link {
    font-weight: 500;
    color: var(--dark-color);
    transition: color 0.3s ease;
    margin: 0 10px;
}

.nav-link:hover {
    color: var(--primary-color);
}

.nav-btn {
    border-radius: 50px;
    padding: 0.5rem 1.5rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    transition: all 0.3s ease;
}

.main-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 3rem 1rem;
}

.hero-section {
    text-align: center;
    margin-bottom: 3rem;
    padding: 1rem;
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.hero-subtitle {
    font-size: 1.1rem;
    color: #6c757d;
    margin-bottom: 2rem;
}

.url-card {
    background: white;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    padding: 2.5rem;
    margin-bottom: 2rem;
    transition: transform 0.3s ease;
}

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

.url-form input {
    border-radius: 50px;
    padding: 12px 20px;
    font-size: 1rem;
    border: 2px solid #e9ecef;
    transition: all 0.3s ease;
}

.url-form input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(67, 97, 238, 0.25);
}

.btn-shorten {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50px;
    padding: 12px 30px;
    font-weight: 600;
    letter-spacing: 0.5px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(67, 97, 238, 0.3);
}

.btn-shorten:hover {
    background-color: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(67, 97, 238, 0.4);
}

.result-box {
    background-color: #f8f9fa;
    border-radius: 15px;
    padding: 1.5rem;
    margin-top: 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: all 0.3s ease;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeIn 0.5s ease forwards;
}

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

.shortened-url {
    font-weight: 600;
    color: var(--primary-color);
    margin: 0;
    word-break: break-all;
    font-size: 1.1rem;
}

.copy-btn {
    background-color: var(--light-color);
    color: var(--dark-color);
    border: none;
    border-radius: 50px;
    padding: 8px 20px;
    font-weight: 600;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.copy-btn:hover {
    background-color: var(--accent-color);
    color: white;
}

.ad-space {
    background: linear-gradient(135deg, #f5f7fa 0%, #e4e7eb 100%);
    border-radius: 15px;
    padding: 2rem;
    margin-bottom: 2rem;
    text-align: center;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.03);
}

.ad-label {
    text-transform: uppercase;
    letter-spacing: 2px;
    font-size: 0.8rem;
    font-weight: 600;
    color: #adb5bd;
    margin-bottom: 1rem;
}

.features-section {
    margin-top: 4rem;
    text-align: center;
}

.features-title {
    font-weight: 700;
    margin-bottom: 2rem;
    color: var(--dark-color);
}

.feature-card {
    background: white;
    border-radius: 15px;
    padding: 2rem;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
    height: 100%;
    transition: transform 0.3s ease;
}

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

.feature-icon {
    width: 60px;
    height: 60px;
    background-color: rgba(67, 97, 238, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: var(--primary-color);
    font-size: 1.5rem;
}

.feature-title {
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--dark-color);
}

.feature-text {
    color: #6c757d;
    font-size: 0.95rem;
}

.alert {
    border-radius: 15px;
    padding: 1rem 1.5rem;
    margin-bottom: 1.5rem;
    border: none;
    font-weight: 500;
}

.modal-content {
    border-radius: 15px;
    border: none;
    box-shadow: 0 15px 50px rgba(0, 0, 0, 0.1);
}

.modal-header {
    border-bottom: none;
    padding: 1.5rem 1.5rem 0;
}

.modal-body {
    padding: 1.5rem;
}

.modal-title {
    font-weight: 700;
    color: var(--dark-color);
}

.form-label {
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--dark-color);
}

.form-control {
    border-radius: 10px;
    padding: 12px 15px;
    font-size: 1rem;
    border: 2px solid #e9ecef;
    transition: all 0.3s ease;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(67, 97, 238, 0.15);
}

.form-check-input:checked {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-modal {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50px;
    padding: 12px 30px;
    font-weight: 600;
    letter-spacing: 0.5px;
    transition: all 0.3s ease;
    width: 100%;
    margin-top: 1rem;
}

.btn-modal:hover {
    background-color: var(--secondary-color);
}

footer {
    background-color: white;
    padding: 2rem 0;
    box-shadow: 0 -5px 20px rgba(0, 0, 0, 0.02);
    margin-top: 4rem;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 800px;
    margin: 0 auto;
    padding: 0 1rem;
}

.footer-copyright {
    color: #6c757d;
    font-size: 0.9rem;
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: #f8f9fa;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--dark-color);
    transition: all 0.3s ease;
}

.social-icon:hover {
    background-color: var(--primary-color);
    color: white;
    transform: translateY(-3px);
}

/* Media queries for responsiveness */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .main-container {
        padding: 2rem 1rem;
    }
    
    .url-card, .feature-card {
        padding: 1.5rem;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}

/* Alert animations */
.alert {
    animation: slideDown 0.5s ease forwards;
}

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

.toggle-password {
z-index: 10;
}
.progress-bar {
transition: width 0.3s ease-in-out;
}