:root {
    --primary-color: #007AFF;
    --background-light: #ffffff;
    --text-light: #000000;
    --background-dark: #1a1a1a;
    --text-dark: #ffffff;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    transition: background-color 0.3s, color 0.3s;
    background: linear-gradient(135deg, #f5f7fa 0%, #e4e8eb 100%);
    min-height: 100vh;
}

body.dark-mode {
    background-color: var(--background-dark);
    color: var(--text-dark);
    background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
}

.navbar {
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.8);
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.05);
}

.dark-mode .navbar {
    background-color: rgba(26, 26, 26, 0.8);
}

.card {
    border: none;
    transition: transform 0.3s, box-shadow 0.3s;
    background-color: rgba(255, 255, 255, 0.9);
    border-radius: 15px;
    box-shadow: 0 4px 25px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
}

.dark-mode .card {
    background-color: rgba(40, 40, 40, 0.9);
    background-color: #2d2d2d;
    border: 1px solid #3d3d3d;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
}

.current-time {
    font-size: 1.2rem;
}

.badge {
    font-size: 1.1rem;
    padding: 0.5rem 1rem;
}

.result-container {
    background-color: rgba(0, 0, 0, 0.05);
    padding: 1rem;
    border-radius: 0.5rem;
    margin-top: 1rem;
}

.dark-mode .result-container {
    background-color: rgba(255, 255, 255, 0.1);
}

.code-examples {
    background-color: rgba(0, 0, 0, 0.05);
    padding: 1rem;
    border-radius: 0.5rem;
}

.dark-mode .code-examples {
    background-color: rgba(255, 255, 255, 0.1);
}

pre {
    margin: 0;
    white-space: pre-wrap;
}

.nav-tabs .nav-link {
    color: var(--text-light);
}

.dark-mode .nav-tabs .nav-link {
    color: var(--text-dark);
}

.nav-tabs .nav-link.active {
    background-color: transparent;
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.table {
    background-color: transparent;
    border-radius: 10px;
    overflow: hidden;
}

.dark-mode .table {
    color: var(--text-dark);
    color: #e4e8eb;
}

.table thead th {
    background-color: rgba(0, 122, 255, 0.05);
    border-bottom: none;
    font-weight: 600;
}

.dark-mode .table thead th {
    background-color: rgba(255, 255, 255, 0.05);
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    background: linear-gradient(45deg, #007AFF, #1a8cff);
    border: none;
}

.btn-primary:hover {
    background: linear-gradient(45deg, #0066cc, #007AFF);
    transform: translateY(-1px);
}

.footer {
    background-color: rgba(255, 255, 255, 0.8) !important;
}

.dark-mode .footer {
    background-color: rgba(26, 26, 26, 0.8) !important;
    color: var(--text-dark);
}

.footer a {
    color: var(--primary-color);
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

.btn {
    border-radius: 8px;
    padding: 0.6rem 1.5rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.form-control {
    border-radius: 8px;
    border: 2px solid #e9ecef;
    padding: 0.7rem 1rem;
    transition: all 0.3s ease;
}

.form-control:focus {
    border-color: #007AFF;
    box-shadow: 0 0 0 0.2rem rgba(0, 122, 255, 0.15);
}

.navbar-brand {
    font-weight: 600;
    font-size: 1.3rem;
}

.breadcrumb {
    background: transparent;
    padding: 0.5rem 0;
}

.breadcrumb-item a {
    color: #007AFF;
    text-decoration: none;
}

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

.card, .result-container {
    animation: fadeIn 0.5s ease-out;
}

@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }
    
    .card {
        margin-bottom: 1rem;
    }
}