/* =====================================================
 * 🔐 AUTH.CSS - Trang Đăng nhập / Đăng ký
 * Giao diện hiện đại, mobile-first
 * ===================================================== */

.auth-wrapper {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    background: var(--bg-gradient);
    position: relative;
    overflow: hidden;
}

/* Hiệu ứng hình tròn trang trí nền */
.auth-wrapper::before {
    content: '';
    position: absolute;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.08);
    top: -80px;
    right: -80px;
    pointer-events: none;
}

.auth-wrapper::after {
    content: '';
    position: absolute;
    width: 200px;
    height: 200px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.05);
    bottom: -60px;
    left: -60px;
    pointer-events: none;
}

/* Logo & Tiêu đề */
.auth-brand {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    color: white;
    animation: slideDown 0.6s ease;
}

.auth-brand__icon {
    font-size: 48px;
    margin-bottom: var(--spacing-sm);
    display: block;
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.2));
}

.auth-brand__title {
    font-family: var(--font-display);
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-extrabold);
    letter-spacing: -0.5px;
}

.auth-brand__subtitle {
    font-size: var(--font-size-sm);
    opacity: 0.85;
    margin-top: var(--spacing-xs);
}

/* Card chứa form */
.auth-card {
    width: 100%;
    max-width: 400px;
    background: var(--bg-secondary);
    border-radius: var(--border-radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-xl);
    animation: scaleIn 0.5s ease;
    position: relative;
    z-index: 1;
}

.auth-card__title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.auth-card__desc {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

/* Form inputs đặc biệt cho auth */
.auth-input-group {
    position: relative;
    margin-bottom: var(--spacing-md);
}

.auth-input-group__icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-light);
    font-size: var(--font-size-sm);
    transition: color var(--transition-fast);
    z-index: 1;
}

.auth-input-group .form-input {
    padding-left: 44px;
}

.auth-input-group .form-input:focus+.auth-input-group__icon,
.auth-input-group .form-input:focus~.auth-input-group__icon {
    color: var(--primary);
}

/* Toggle password visibility */
.auth-toggle-password {
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-light);
    cursor: pointer;
    padding: 4px;
    font-size: var(--font-size-sm);
    z-index: 1;
}

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

/* Remember me / Forgot password */
.auth-options {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
    font-size: var(--font-size-sm);
}

.auth-checkbox {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-secondary);
    cursor: pointer;
}

.auth-checkbox input[type="checkbox"] {
    width: 18px;
    height: 18px;
    border-radius: 4px;
    accent-color: var(--primary);
    cursor: pointer;
}

.auth-forgot {
    color: var(--primary);
    font-weight: var(--font-weight-medium);
}

/* Nút đăng nhập chính */
.auth-submit {
    width: 100%;
    padding: 16px;
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-bold);
    border-radius: var(--border-radius);
    background: var(--bg-gradient);
    color: white;
    border: none;
    cursor: pointer;
    transition: all var(--transition);
    box-shadow: var(--shadow-primary);
    position: relative;
    overflow: hidden;
}

.auth-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(108, 92, 231, 0.4);
}

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

/* Loading state */
.auth-submit.loading {
    pointer-events: none;
    opacity: 0.8;
}

.auth-submit.loading::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
}

@keyframes spin {
    to {
        transform: translateY(-50%) rotate(360deg);
    }
}

/* Divider "hoặc" */
.auth-divider {
    display: flex;
    align-items: center;
    margin: var(--spacing-lg) 0;
    color: var(--text-light);
    font-size: var(--font-size-sm);
}

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

.auth-divider span {
    padding: 0 var(--spacing-md);
}

/* Link chuyển đổi login/register */
.auth-switch {
    text-align: center;
    margin-top: var(--spacing-lg);
    font-size: var(--font-size-sm);
    color: white;
}

.auth-switch a {
    color: white;
    font-weight: var(--font-weight-bold);
    text-decoration: underline;
    text-underline-offset: 2px;
}

/* Password strength indicator */
.password-strength {
    display: flex;
    gap: 4px;
    margin-top: var(--spacing-xs);
    margin-bottom: var(--spacing-xs);
}

.password-strength__bar {
    flex: 1;
    height: 4px;
    border-radius: 2px;
    background: var(--border-light);
    transition: background var(--transition-fast);
}

.password-strength__bar.active.weak {
    background: var(--danger);
}

.password-strength__bar.active.medium {
    background: var(--warning);
}

.password-strength__bar.active.strong {
    background: var(--success);
}

.password-strength__text {
    font-size: var(--font-size-xs);
    color: var(--text-light);
    margin-top: 2px;
}