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

:root {
    --primary-color: #667eea;
    --primary-dark: #5a6fd8;
    --secondary-color: #764ba2;
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --background: #f8fafc;
    --card-background: #ffffff;
    --border-color: #e5e7eb;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px 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);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    min-height: calc(100vh - 40px);
}

/* Header Styles */
.header {
    text-align: center;
    margin-bottom: 40px;
    color: white;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-bottom: 16px;
}

.logo i {
    font-size: 3rem;
    background: linear-gradient(45deg, #fff, #f0f9ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(45deg, #fff, #f0f9ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
    font-weight: 300;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 40px;
}

/* Card Styles */
.card {
    background: var(--card-background);
    border-radius: 16px;
    padding: 32px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
}

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

.card-header h2 {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.card-header h2 i {
    color: var(--primary-color);
}

.card-header p {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* Form Styles */
.form {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

/* Tab Styles */
.tabs {
    display: flex;
    background: var(--background);
    border-radius: 12px;
    padding: 4px;
    margin-bottom: 24px;
}

.tab-button {
    flex: 1;
    padding: 12px 20px;
    background: none;
    border: none;
    border-radius: 8px;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.tab-button.active {
    background: var(--card-background);
    color: var(--primary-color);
    box-shadow: var(--shadow);
}

.tab-button:hover:not(.active) {
    color: var(--text-primary);
}

.tab-content {
    position: relative;
}

.tab-pane {
    display: none;
}

.tab-pane.active {
    display: block;
}

/* Input Styles */
.label {
    display: block;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-icon {
    position: absolute;
    left: 16px;
    color: var(--text-secondary);
    z-index: 1;
}

.input {
    width: 100%;
    padding: 16px 16px 16px 48px;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-size: 1rem;
    transition: all 0.2s ease;
    background: var(--card-background);
}

.input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.input::placeholder {
    color: var(--text-secondary);
}

/* Button Styles */
.btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 16px 32px;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    box-shadow: var(--shadow);
}

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

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

.btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none !important;
}

/* Loading Spinner */
.loading-spinner {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top: 2px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    display: none;
}

.btn.loading .loading-spinner {
    display: block;
}

.btn.loading span {
    opacity: 0.7;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Result Styles */
.result-container {
    margin-top: 24px;
}

.result {
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 16px;
    animation: slideIn 0.3s ease;
}

.result.success {
    background: linear-gradient(135deg, #ecfdf5, #d1fae5);
    border: 1px solid #a7f3d0;
    color: #065f46;
}

.result.error {
    background: linear-gradient(135deg, #fef2f2, #fecaca);
    border: 1px solid #fca5a5;
    color: #991b1b;
}

.result.info {
    background: linear-gradient(135deg, #eff6ff, #dbeafe);
    border: 1px solid #93c5fd;
    color: #1e40af;
}

.result-header {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 600;
    margin-bottom: 12px;
    font-size: 1.1rem;
}

.result-body {
    margin-left: 28px;
}

.user-details {
    background: rgba(255, 255, 255, 0.5);
    padding: 16px;
    border-radius: 8px;
    margin-top: 12px;
}

.user-details h4 {
    margin-bottom: 8px;
    color: inherit;
}

.user-detail {
    display: flex;
    justify-content: space-between;
    padding: 4px 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.user-detail:last-child {
    border-bottom: none;
}

.user-detail strong {
    color: inherit;
}

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

/* Features Section */
.features {
    background: var(--card-background);
    border-radius: 16px;
    padding: 32px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
}

.features h3 {
    text-align: center;
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 32px;
    color: var(--text-primary);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
}

.feature-item {
    text-align: center;
    padding: 24px;
    border-radius: 12px;
    background: linear-gradient(135deg, #f8fafc, #f1f5f9);
    border: 1px solid var(--border-color);
    transition: transform 0.2s ease;
}

.feature-item:hover {
    transform: translateY(-4px);
}

.feature-item i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 16px;
}

.feature-item h4 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.feature-item p {
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Footer */
.footer {
    text-align: center;
    padding: 24px 0;
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.9rem;
    margin-top: 40px;
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding: 12px;
    }
    
    .container {
        min-height: calc(100vh - 24px);
    }
    
    .logo h1 {
        font-size: 2rem;
    }
    
    .logo i {
        font-size: 2.5rem;
    }
    
    .card {
        padding: 24px;
    }
    
    .tabs {
        flex-direction: column;
        gap: 4px;
    }
    
    .tab-button {
        padding: 16px;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
    }
    
    .logo {
        flex-direction: column;
        gap: 12px;
    }
}

@media (max-width: 480px) {
    .card-header h2 {
        font-size: 1.5rem;
        flex-direction: column;
        gap: 8px;
    }
    
    .input {
        padding: 14px 14px 14px 44px;
    }
    
    .btn {
        padding: 14px 24px;
    }
}