/* Custom styles that complement Tailwind CSS */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

body {
    font-family: 'Inter', sans-serif;
    min-height: 100vh;
    transition: background-color 0.3s ease;
}

/* Theme-specific styles */
body.light-mode {
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #cbd5e1; /* 更深的边框色，提高对比度 */
    --card-bg: #ffffff;
    --button-primary: #3b82f6;
    --button-primary-hover: #2563eb;
    --button-secondary: #64748b; /* 调整为中等灰色，提高对比度 */
    --button-secondary-hover: #475569;
}

body.dark-mode {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --border-color: #334155;
    --card-bg: #1e293b;
    --button-primary: #3b82f6;
    --button-primary-hover: #2563eb;
    --button-secondary: #64748b;
    --button-secondary-hover: #94a3b8;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    border-radius: 1rem;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    background-color: var(--bg-primary);
}

.header {
    padding: 2rem;
    text-align: center;
    background: linear-gradient(135deg, #3b82f6, #8b5cf6);
    color: white;
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
    font-weight: 400;
}

.theme-toggle {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    background: rgba(255, 255, 255, 0.2);
    border: none;
    border-radius: 50%;
    width: 2.5rem;
    height: 2.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.theme-toggle:hover {
    transform: scale(1.1);
    background: rgba(255, 255, 255, 0.3);
}

body.dark-mode .theme-toggle {
    background: rgba(0, 0, 0, 0.2);
}

body.dark-mode .theme-toggle:hover {
    background: rgba(0, 0, 0, 0.3);
}

.main-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
    padding: 2rem;
}

.card {
    border-radius: 0.75rem;
    padding: 1.5rem;
    background-color: var(--card-bg);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    color: var(--text-primary);
}

.card h2 {
    margin-bottom: 1.25rem;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.25rem;
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.875rem;
}

.form-control {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border-radius: 0.375rem;
    font-size: 0.875rem;
    border: 2px solid var(--border-color);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    transition: all 0.3s;
}

/* Enhanced form control visibility in light mode */
body.light-mode .form-control {
    border-color: #cbd5e1; /* Darker border for better visibility */
}

body.light-mode .form-control:focus {
    border-color: #3b82f6;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-control:focus {
    outline: none;
    border-color: #3b82f6;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-control.error {
    border-color: #ef4444;
}

.btn-group {
    display: flex;
    gap: 0.75rem;
    margin-top: 1.25rem;
    flex-wrap: wrap;
}

.btn {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 0.375rem;
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 600;
    transition: all 0.3s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.btn-primary {
    background: linear-gradient(135deg, #3b82f6, #8b5cf6);
    color: white;
    box-shadow: 0 4px 6px -1px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 8px -1px rgba(59, 130, 246, 0.4);
}

.btn-secondary {
    background-color: var(--button-secondary);
    color: white;
}

.btn-secondary:hover {
    background-color: var(--button-secondary-hover);
    transform: translateY(-2px);
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.result-card {
    padding: 1rem;
    border-radius: 0.5rem;
    text-align: center;
    background-color: var(--bg-secondary);
    transition: all 0.3s ease;
}

.result-label {
    font-size: 0.75rem;
    margin-bottom: 0.25rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.result-value {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
}

.placeholder {
    font-style: italic;
    text-align: center;
    padding: 1.25rem;
    color: var(--text-secondary);
}

.warning {
    padding: 0.75rem;
    border-radius: 0.5rem;
    margin-top: 1rem;
    background-color: #fffbeb;
    color: #92400e;
    border: 1px solid #fbbf24;
}

body.dark-mode .warning {
    background-color: #451a03;
    color: #fde68a;
    border-color: #f59e0b;
}

.error {
    padding: 0.75rem;
    border-radius: 0.5rem;
    margin-top: 1rem;
    background-color: #fef2f2;
    color: #b91c1c;
    border: 1px solid #f87171;
}

body.dark-mode .error {
    background-color: #7f1d1d;
    color: #fecaca;
    border-color: #f87171;
}

.hidden {
    display: none !important;
}

.guidance-section ul {
    list-style-type: none;
    padding-left: 0;
}

.guidance-section li {
    margin-bottom: 0.5rem;
    padding: 0.5rem;
    border-radius: 0.5rem;
    background-color: var(--bg-secondary);
    font-size: 0.875rem;
}

.alert {
    position: fixed;
    top: 1.25rem;
    right: 1.25rem;
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    font-weight: 600;
    z-index: 1000;
    animation: slideIn 0.3s ease-out;
    transition: all 0.3s ease;
    color: white;
}

.alert-info {
    background: #0ea5e9;
}

.alert-success {
    background: #22c55e;
}

.alert-warning {
    background: #f59e0b;
}

.alert-error {
    background: #ef4444;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Responsive design */
@media (max-width: 768px) {
    .main-content {
        grid-template-columns: 1fr;
    }
    
    .header h1 {
        font-size: 2rem;
    }
    
    .btn-group {
        flex-direction: column;
    }
    
    .theme-toggle {
        top: 1rem;
        right: 1rem;
        width: 2rem;
        height: 2rem;
    }
    
    .results-grid {
        grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    }
}