:root {
    --primary-color: #ffd600;
    --primary-hover: #ffb300;
    --secondary-color: #222222;
    --background-color: #111827;
    --card-background: #1f2937;
    --text-color: #f9fafb;
    --text-light: #d1d5db;
    --border-color: #374151;
    --success-color: #10b981;
    --error-color: #ef4444;
    --border-radius: 12px;
    --box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --transition: all 0.3s ease;
}

body {
    font-family: 'Montserrat', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: var(--transition);
}

[data-theme="dark"] body,
body {
    background-color: var(--background-color);
    color: var(--text-color);
}

.theme-toggle {
    display: none;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.navbar {
    background-color: var(--card-background);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--box-shadow);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 625;
    color: var(--primary-color);
}

.main-content {
    flex: 1;
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.hero-section {
    text-align: center;
    margin-bottom: 3rem;
    animation: fadeIn 1s cubic-bezier(0.4,0,0.2,1);
}

.hero-section h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(to right, var(--primary-color), var(--primary-hover));
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-section p {
    color: var(--text-light);
    font-size: 1.1rem;
}

.url-form-container {
    background-color: var(--card-background);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    margin-bottom: 3rem;
    animation: fadeIn 1.2s cubic-bezier(0.4,0,0.2,1);
}

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

.input-wrapper {
    flex: 1;
    position: relative;
}

.input-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-light);
}

input[type="url"],
input[type="text"] {
    width: 100%;
    padding: 1rem 1rem 1rem 3rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
    background-color: var(--card-background);
    color: var(--text-color);
}

input[type="url"]:focus,
input[type="text"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.primary-btn {
    background-color: var(--primary-color);
    color: #222222; /* Dark text for yellow button */
    border: none;
    padding: 1rem 2rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.primary-btn:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    color: #222222;
}

.primary-btn:active {
    transform: translateY(0);
}

.features-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.feature-card {
    background-color: var(--card-background);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    text-align: center;
    transition: var(--transition);
    animation: popIn 0.7s cubic-bezier(0.4,0,0.2,1);
}

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

.feature-card i {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.feature-card h3 {
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.feature-card p {
    color: var(--text-light);
}

.history-section {
    background-color: var(--card-background);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.section-header h2 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-color);
}

.clear-btn {
    background: none;
    border: none;
    color: var(--error-color);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.clear-btn:hover {
    background-color: rgba(239, 68, 68, 0.1);
}

.url-history {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.url-item {
    background-color: var(--background-color);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
    animation: fadeIn 0.7s cubic-bezier(0.4,0,0.2,1);
}

.url-item:hover {
    transform: translateX(5px);
}

.url-info {
    flex: 1;
}

.original-url {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
    word-break: break-all;
}

.shortened-url {
    color: var(--primary-color);
    font-weight: 500;
    word-break: break-all;
}

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

.action-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: var(--transition);
    color: var(--text-light);
}

.action-btn:hover {
    background-color: var(--border-color);
    color: var(--text-color);
}

.notification {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background-color: var(--success-color);
    color: white;
    padding: 1rem 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transform: translateY(100px);
    opacity: 0;
    transition: var(--transition);
}

.notification.show {
    transform: translateY(0);
    opacity: 1;
    animation: popIn 0.4s cubic-bezier(0.4,0,0.2,1);
}

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

.qr-code-container {
    text-align: center;
    margin-top: 1rem;
    padding: 1rem;
    background-color: var(--background-color);
    border-radius: var(--border-radius);
}

.qr-code-image {
    max-width: 200px;
    height: auto;
    margin: 0 auto;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.qr-code-actions {
    margin-top: 1rem;
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.qr-code-actions .action-btn {
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    background-color: var(--primary-color);
    color: #222222 !important;
    transition: var(--transition);
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: 'Montserrat', Arial, Helvetica, sans-serif !important;
}

.qr-code-actions .action-btn:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
}

.custom-url-section {
    margin-top: 1rem;
    display: none;
}

.custom-url-section.show {
    display: block;
    animation: slideDown 0.3s ease;
}

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

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

@keyframes popIn {
    0% { opacity: 0; transform: scale(0.95); }
    100% { opacity: 1; transform: scale(1); }
}

/* Responsive Design */
@media (max-width: 768px) {
    .main-content {
        padding: 1rem;
    }

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

    .primary-btn {
        width: 100%;
        justify-content: center;
    }

    .features-section {
        grid-template-columns: 1fr;
    }
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.nav-btn {
    background: none;
    border: none;
    color: var(--text-color);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.nav-btn:hover {
    background-color: var(--border-color);
}

.history-actions {
    display: flex;
    gap: 1rem;
}