:root {
    --bg-color: #f0f4f8;
    --card-bg: #ffffff;
    --text-primary: #1a202c;
    --text-secondary: #718096;
    --brand-blue: #2563eb;
    --brand-blue-hover: #1d4ed8;
    --border-color: #e2e8f0;
    --input-bg: #ffffff;
    --input-border: #e2e8f0;
    --input-focus-border: #94a3b8;
    --input-focus-shadow: rgba(37, 99, 235, 0.12);
    --error-color: #ef4444;
    --success-color: #10b981;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 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);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

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

html, body {
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.5;
}

.account-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.account-card {
    width: 100%;
    max-width: 440px;
    background: var(--card-bg);
    border-radius: 16px;
    box-shadow: var(--shadow-xl);
    padding: 40px;
    position: relative;
}

.form-title {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    text-align: center;
}

.form-subtitle {
    font-size: 14px;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 32px;
}

.account-form {
    width: 100%;
}

.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.label-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

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

.input-icon {
    position: absolute;
    left: 12px;
    color: var(--text-secondary);
    pointer-events: none;
    z-index: 1;
}

.form-input {
    width: 100%;
    padding: 12px 12px 12px 40px;
    font-size: 14px;
    color: var(--text-primary);
    background-color: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: 10px;
    outline: none;
    transition: all 0.2s ease;
}

.form-input:focus {
    border-color: var(--input-focus-border);
    box-shadow: 0 0 0 4px var(--input-focus-shadow);
}

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

.toggle-password {
    position: absolute;
    right: 12px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: color 0.2s ease;
}

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

.eye-icon,
.eye-off-icon {
    width: 16px;
    height: 16px;
}

.forgot-link {
    font-size: 14px;
    color: var(--brand-blue);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
}

.forgot-link:hover {
    color: var(--brand-blue-hover);
    text-decoration: underline;
}

.btn-primary {
    width: 100%;
    padding: 12px 16px;
    font-size: 16px;
    font-weight: 600;
    color: #ffffff;
    background-color: var(--brand-blue);
    border: none;
    border-radius: 10px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all 0.2s ease;
    margin-top: 8px;
}

.btn-primary:hover {
    background-color: var(--brand-blue-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

.divider {
    display: flex;
    align-items: center;
    text-align: center;
    margin: 24px 0;
    color: var(--text-secondary);
    font-size: 14px;
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    border-bottom: 1px solid var(--border-color);
}

.divider span {
    padding: 0 16px;
}

.btn-social {
    width: 100%;
    padding: 12px 16px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    text-decoration: none;
    transition: all 0.2s ease;
    margin-bottom: 24px;
}

.btn-social:hover {
    background-color: #f7fafc;
    border-color: var(--input-focus-border);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

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

.btn-google {
    border-color: var(--border-color);
    margin-top: 0;
}

.btn-google:hover {
    background-color: #f8f9fa;
    border-color: #dadce0;
}

.btn-google-primary {
    background-color: #4285F4;
    border: none;
}

.btn-google-primary:hover {
    background-color: #357ae8;
}

.form-footer {
    text-align: center;
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: 24px;
}

.form-footer a {
    color: var(--brand-blue);
    text-decoration: none;
    font-weight: 500;
    margin-left: 4px;
    transition: color 0.2s ease;
}

.form-footer a:hover {
    color: var(--brand-blue-hover);
    text-decoration: underline;
}

.alert {
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 14px;
    line-height: 1.5;
}

.alert-error {
    background-color: #fee2e2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

.alert-success {
    background-color: #d1fae5;
    color: #065f46;
    border: 1px solid #a7f3d0;
}

.text-danger {
    color: var(--error-color);
    font-size: 12px;
    margin-top: 4px;
    display: block;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-size: 14px;
    color: var(--text-primary);
}

.checkbox-label input[type="checkbox"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
    accent-color: var(--brand-blue);
}

/* Mobile Responsive */
@media (max-width: 640px) {
    .account-container {
        padding: 16px;
    }

    .account-card {
        padding: 32px 24px;
        border-radius: 12px;
    }

    .form-title {
        font-size: 22px;
    }

    .form-subtitle {
        font-size: 13px;
    }

    .btn-primary,
    .btn-social {
        padding: 14px 16px;
        font-size: 15px;
    }
}

@media (max-width: 480px) {
    .account-card {
        padding: 24px 20px;
    }

    .form-title {
        font-size: 20px;
    }

    .form-group {
        margin-bottom: 18px;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus visible for keyboard navigation */
.btn-primary:focus-visible,
.btn-social:focus-visible,
.form-input:focus-visible,
.toggle-password:focus-visible {
    outline: 2px solid var(--brand-blue);
    outline-offset: 2px;
}