:root {
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] {
    --bg-primary: #1f2937;
    --bg-secondary: #111827;
    --text-primary: #f9fafb;
    --text-secondary: #9ca3af;
    --border-color: #374151;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    color: var(--text-primary);
}

.container {
    width: 100%;
    max-width: 640px;
    animation: fadeIn 0.5s ease-in;
}

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

.header {
    background: var(--bg-primary);
    padding: 16px 20px;
    border-radius: 12px 12px 0 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow);
}

.api-badge {
    background: var(--bg-secondary);
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 600;
}

.status-info {
    display: flex;
    gap: 16px;
    font-size: 14px;
    color: var(--text-secondary);
}

.theme-toggle {
    background: var(--bg-secondary);
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 20px;
    transition: all 0.3s ease;
}

.theme-toggle:hover {
    transform: scale(1.1);
}

.nav-tabs {
    background: var(--bg-primary);
    display: flex;
    border-bottom: 2px solid var(--border-color);
}

.tab {
    flex: 1;
    padding: 16px;
    border: none;
    background: transparent;
    cursor: pointer;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all 0.3s ease;
    position: relative;
}

.tab.active {
    color: var(--primary-color);
}

.tab.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary-color);
}

.tab:hover {
    background: var(--bg-secondary);
}

.tab-content {
    background: var(--bg-primary);
    padding: 32px 24px;
    border-radius: 0 0 12px 12px;
    box-shadow: var(--shadow-lg);
}

.tab-content.hidden {
    display: none;
}

.card {
    width: 100%;
}

.card-header {
    text-align: center;
    margin-bottom: 32px;
}

.card-header h2 {
    font-size: 28px;
    margin-bottom: 8px;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 12px;
}

.api-status {
    display: inline-block;
    background: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
}

.form {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-size: 14px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 6px;
}

.icon {
    font-size: 16px;
}

.info-icon {
    cursor: help;
    opacity: 0.6;
    font-size: 14px;
}

.form-group input[type="text"],
.form-group input[type="password"],
.form-group input[type="number"] {
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 15px;
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: all 0.3s ease;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.slider {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--border-color);
    outline: none;
    -webkit-appearance: none;
    margin: 8px 0;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    transition: all 0.3s ease;
}

.slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 0 0 8px rgba(59, 130, 246, 0.2);
}

.slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    border: none;
}

.range-labels {
    display: flex;
    justify-content: space-between;
    font-size: 13px;
    color: var(--text-secondary);
}

#currentSteps {
    font-weight: 700;
    color: var(--primary-color);
}

.submit-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 14px 24px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all 0.3s ease;
    margin-top: 8px;
}

.submit-btn:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.submit-btn:disabled {
    background: var(--border-color);
    cursor: not-allowed;
    transform: none;
}

.submit-btn.loading .btn-icon {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

.result {
    margin-top: 24px;
    padding: 16px;
    border-radius: 8px;
    display: none;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.result.show {
    display: block;
}

.result.success {
    background: rgba(16, 185, 129, 0.1);
    border-left: 4px solid var(--success-color);
    color: var(--success-color);
}

.result.error {
    background: rgba(239, 68, 68, 0.1);
    border-left: 4px solid var(--error-color);
    color: var(--error-color);
}

.about-content {
    line-height: 1.6;
}

.about-content h2 {
    margin-bottom: 24px;
    font-size: 24px;
}

.info-section {
    margin-bottom: 24px;
}

.info-section h3 {
    font-size: 18px;
    margin-bottom: 12px;
}

.info-section p,
.info-section ul {
    color: var(--text-secondary);
    font-size: 15px;
}

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

.info-section li {
    padding: 8px 0;
    padding-left: 24px;
    position: relative;
}

.info-section li::before {
    content: '•';
    position: absolute;
    left: 8px;
    color: var(--primary-color);
    font-weight: bold;
}

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

.info-section a:hover {
    text-decoration: underline;
}

.footer {
    text-align: center;
    padding: 20px;
    color: white;
    font-size: 14px;
}

.footer a {
    color: white;
    text-decoration: none;
    font-weight: 600;
}

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

@media (max-width: 640px) {
    .status-info {
        flex-direction: column;
        gap: 4px;
        font-size: 12px;
    }

    .header {
        flex-wrap: wrap;
    }

    .card-header h2 {
        font-size: 24px;
    }

    .tab-content {
        padding: 24px 16px;
    }
}