/* Modern Authentication Styles */

:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --primary-dark: #3730a3;
    --primary-light: #eef2ff;
    --success-color: #10b981;
    --error-color: #ef4444;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
    --background: #f9fafb;
    --card-background: #ffffff;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
}

* {
    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: 1rem;
    color: var(--text-primary);
    line-height: 1.6;
}

.auth-container {
    width: 100%;
    max-width: 480px;
    animation: fadeIn 0.5s ease-in-out;
}

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

.auth-card {
    background: var(--card-background);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 2.5rem;
    margin: 0 auto;
}

.auth-header {
    text-align: center;
    margin-bottom: 2rem;
}

.logo {
    width: 64px;
    height: 64px;
    margin-bottom: 1rem;
    border-radius: var(--radius-md);
}

.auth-header h1 {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

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

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"] {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 0.875rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
    background: var(--card-background);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.form-group input::placeholder {
    color: #9ca3af;
}

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

.password-input-wrapper input {
    padding-right: 3rem;
}

.toggle-password {
    position: absolute;
    right: 0.75rem;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 0.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.2s ease;
}

.toggle-password:hover {
    color: var(--primary-color);
}

.eye-icon {
    stroke-width: 2;
}

.form-help {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.form-options {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: -0.5rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-primary);
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: 1rem;
    height: 1rem;
    cursor: pointer;
    accent-color: var(--primary-color);
}

.error-message {
    padding: 0.75rem 1rem;
    background-color: #fee2e2;
    border: 1px solid #fecaca;
    border-radius: var(--radius-md);
    color: #991b1b;
    font-size: 0.875rem;
    animation: slideDown 0.3s ease;
}

.success-message {
    padding: 0.75rem 1rem;
    background-color: #d1fae5;
    border: 1px solid #a7f3d0;
    border-radius: var(--radius-md);
    color: #065f46;
    font-size: 0.875rem;
    animation: slideDown 0.3s ease;
}

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

.btn-primary {
    width: 100%;
    padding: 0.75rem 1.5rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: white;
    background-color: var(--primary-color);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-loader {
    display: inline-flex;
    align-items: center;
}

.spinner {
    animation: spin 1s linear infinite;
}

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

.auth-footer {
    text-align: center;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.auth-footer p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
}

.link:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 640px) {
    .auth-card {
        padding: 1.5rem;
    }

    .auth-header h1 {
        font-size: 1.5rem;
    }

    .logo {
        width: 48px;
        height: 48px;
    }
}

/* Password strength indicator */
.password-strength {
    display: flex;
    gap: 0.25rem;
    margin-top: 0.5rem;
}

.strength-bar {
    height: 4px;
    flex: 1;
    background-color: var(--border-color);
    border-radius: 2px;
    transition: background-color 0.3s ease;
}

.strength-bar.active {
    background-color: var(--error-color);
}

.strength-bar.active.medium {
    background-color: #f59e0b;
}

.strength-bar.active.strong {
    background-color: var(--success-color);
}

/* Input validation states */
.form-group input.invalid {
    border-color: var(--error-color);
}

.form-group input.valid {
    border-color: var(--success-color);
}

.validation-message {
    font-size: 0.75rem;
    margin-top: 0.25rem;
}

.validation-message.error {
    color: var(--error-color);
}

.validation-message.success {
    color: var(--success-color);
}