:root {
    --primary-color: #4361ee;
    --secondary-color: #3f37c9;
    --accent-color: #4895ef;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    --success-color: #4bb543;
    --error-color: #ff3333;
    --border-radius: 8px;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #f5f7ff;
    color: var(--dark-color);
    line-height: 1.6;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    text-align: center;
    margin-bottom: 2rem;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.logo i {
    font-size: 2rem;
    color: var(--primary-color);
}

.logo h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

.tagline {
    color: #666;
    font-size: 1rem;
}

.url-form {
    background-color: white;
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    margin-bottom: 2rem;
}

.input-group {
    display: flex;
    margin-bottom: 1rem;
}

.input-group input {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 1px solid #ddd;
    border-radius: var(--border-radius) 0 0 var(--border-radius);
    font-size: 1rem;
    outline: none;
    transition: var(--transition);
}

.input-group input:focus {
    border-color: var(--primary-color);
}

.input-group button {
    padding: 0 1.5rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: var(--transition);
}

.input-group button:hover {
    background-color: var(--secondary-color);
}

.features {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    color: #666;
    font-size: 0.9rem;
}

.features span i {
    margin-right: 0.3rem;
    color: var(--primary-color);
}

.result-container {
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 1.5rem;
    margin-bottom: 2rem;
    transition: var(--transition);
}

.result-container.hidden {
    display: none;
}

.result-box {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.original-url {
    padding: 0.5rem;
    background-color: #f8f9fa;
    border-radius: var(--border-radius);
    font-size: 0.9rem;
    color: #555;
    word-break: break-all;
}

.shortened-url {
    display: flex;
    gap: 0.5rem;
}

.shortened-url input {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    font-size: 1rem;
    background-color: #f8f9fa;
    color: var(--primary-color);
    font-weight: 600;
}

.shortened-url button {
    padding: 0 1.5rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: var(--transition);
}

.shortened-url button:hover {
    background-color: var(--secondary-color);
}

.share-options {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 1rem;
}

.share-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: none;
    background-color: #f0f2f5;
    color: #555;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.share-btn:hover {
    transform: translateY(-2px);
}

.share-btn i {
    font-size: 1rem;
}

.qr-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.qr-modal.show {
    opacity: 1;
    visibility: visible;
}

.qr-content {
    background-color: white;
    padding: 2rem;
    border-radius: var(--border-radius);
    width: 90%;
    max-width: 400px;
    position: relative;
    text-align: center;
}

.close-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    font-size: 1.5rem;
    cursor: pointer;
    color: #666;
}

.qr-content h3 {
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

#qr-code {
    margin: 0 auto 1.5rem;
    padding: 1rem;
    background-color: white;
    border: 1px solid #eee;
    border-radius: var(--border-radius);
}

.qr-download {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
}

.qr-download button {
    padding: 0.5rem 1rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 0.9rem;
    transition: var(--transition);
}

.qr-download button:hover {
    background-color: var(--secondary-color);
}

footer {
    margin-top: auto;
    text-align: center;
    padding-top: 2rem;
    color: #666;
    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: #666;
    text-decoration: none;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--primary-color);
}

.notification {
    position: fixed;
    bottom: 20px;
    right: 20px;
    padding: 1rem 1.5rem;
    background-color: var(--success-color);
    color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transform: translateY(100px);
    opacity: 0;
    transition: var(--transition);
    z-index: 1000;
}

.notification.show {
    transform: translateY(0);
    opacity: 1;
}

.notification.error {
    background-color: var(--error-color);
}

@media (max-width: 600px) {
    .container {
        padding: 1rem;
    }

    .input-group {
        flex-direction: column;
    }

    .input-group input {
        border-radius: var(--border-radius);
        margin-bottom: 0.5rem;
    }

    .input-group button {
        border-radius: var(--border-radius);
        padding: 0.75rem;
    }

    .features {
        flex-direction: column;
        gap: 0.5rem;
        align-items: center;
    }
}