.login-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: rgba(10,11,14,.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-6);
    z-index: 100;
}

.login-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--gray-900);
}

    .login-logo em {
        font-style: normal;
        color: var(--primary-900);
    }

.header-back {
    font-size: .875rem;
    color: var(--gray-500);
    text-decoration: none;
    transition: color .2s;
}

    .header-back:hover {
        color: var(--primary-900);
    }

.login-page {
    min-height: 100vh;
    padding-top: 60px;
    display: flex;
}

.login-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
}

/* 左侧品牌 */
.login-brand {
    background: linear-gradient(160deg,rgba(108,92,231,.12) 0%,var(--bg-secondary) 100%);
    padding: var(--spacing-16) var(--spacing-12);
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    margin-bottom: var(--spacing-6);
}

.brand-logo-icon {
    font-size: 2.5rem;
}

.brand-logo-text {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--gray-900);
}

.brand-logo-hl {
    color: var(--primary-900);
}

.brand-slogan {
    font-size: 1.1rem;
    color: var(--gray-500);
    margin-bottom: var(--spacing-8);
}

.brand-features {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
    margin-bottom: var(--spacing-8);
}

.bf-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    font-size: .95rem;
    color: var(--gray-600);
}

.bf-icon {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: rgba(108,92,231,.15);
    color: var(--primary-900);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: .75rem;
    font-weight: 700;
    flex-shrink: 0;
}

.brand-quote {
    border-left: 3px solid var(--primary-900);
    padding-left: var(--spacing-4);
    margin: 0;
}

    .brand-quote p {
        font-style: italic;
        color: var(--gray-600);
        margin-bottom: var(--spacing-2);
    }

    .brand-quote cite {
        font-size: .85rem;
        color: var(--gray-400);
        font-style: normal;
    }

/* 右侧表单 */
.login-form-area {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-8) var(--spacing-10);
    background: var(--bg-primary);
}

.auth-container {
    width: 100%;
    max-width: 400px;
}

.auth-card {
    background: var(--bg-tertiary);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-8);
}

.auth-brand {
    text-align: center;
    margin-bottom: var(--spacing-6);
}

    .auth-brand img {
        width: 200px;
        margin-bottom: 10px;
    }

.brand-icon {
    font-size: 2.5rem;
}

.brand-title {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--gray-900);
    margin: var(--spacing-2) 0 var(--spacing-1);
}

.brand-accent {
    color: var(--primary-900);
}

.brand-slogan2 {
    font-size: .875rem;
    color: var(--gray-500);
}

/* Steps */
.auth-steps {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
    margin-bottom: var(--spacing-6);
}

.auth-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.step-dot {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: 2px solid var(--gray-200);
    background: var(--bg-secondary);
    color: var(--gray-500);
    font-size: .8rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all .2s;
}

.auth-step.active .step-dot {
    border-color: var(--primary-900);
    background: var(--primary-900);
    color: #fff;
}

.auth-step.done .step-dot {
    border-color: var(--success);
    background: var(--success);
    color: #fff;
}

.step-label {
    font-size: .7rem;
    color: var(--gray-500);
    white-space: nowrap;
}

.auth-step.active .step-label {
    color: var(--primary-900);
}

.step-line {
    flex: 1;
    height: 2px;
    background: var(--gray-200);
    min-width: 24px;
    transition: background .2s;
}

    .step-line.active {
        background: var(--primary-900);
    }

/* Form panels */
.auth-step-panel {
    animation: fadeIn .25s ease;
}

@@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(6px)
    }

    to {
        opacity: 1;
        transform: none
    }
}

.form-group {
    margin-bottom: var(--spacing-4);
}

    .form-group label {
        display: block;
        font-size: .875rem;
        color: var(--gray-600);
        margin-bottom: var(--spacing-2);
        font-weight: 500;
    }

.input-icon-wrap {
    position: relative;
}

.input-icon {
    position: absolute;
    left: var(--spacing-4);
    top: 50%;
    transform: translateY(-50%);
    font-size: 1rem;
    pointer-events: none;
}

.input-icon-wrap input {
    padding-left: var(--spacing-10);
}

.form-error {
    font-size: .8rem;
    color: var(--error);
    margin-top: 4px;
    display: block;
}

.auth-tip {
    text-align: center;
    font-size: .8rem;
    color: var(--gray-500);
    margin-top: var(--spacing-3);
}

/* Captcha */
.captcha-title {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-3);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-4);
    margin-bottom: var(--spacing-4);
}

.captcha-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.captcha-heading {
    font-size: .95rem;
    font-weight: 600;
    color: var(--gray-900);
}

.captcha-sub {
    font-size: .8rem;
    color: var(--gray-500);
    margin-top: 2px;
}

.captcha-box {
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-5);
    margin-bottom: var(--spacing-5);
}

.captcha-question {
    font-size: .875rem;
    color: var(--gray-500);
    margin-bottom: var(--spacing-4);
}

.math-row {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
}

.math-display {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    background: var(--bg-elevated);
    padding: var(--spacing-3) var(--spacing-4);
    border-radius: var(--radius-lg);
}

.math-num {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-900);
}

.math-op {
    font-size: 1.25rem;
    color: var(--gray-500);
}

.math-q {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--gray-400);
}

.math-input {
    -moz-appearance: textfield;
    appearance: textfield;
    width: 90px;
    flex-shrink: 0;
    text-align: center;
    font-size: 1.2rem;
    font-weight: 700;
}

    .math-input::-webkit-inner-spin-button,
    .math-input::-webkit-outer-spin-button {
        -webkit-appearance: none;
        margin: 0;
    }

.step-actions {
    display: flex;
    gap: var(--spacing-3);
}

/* Code */
.code-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-4);
    margin-bottom: var(--spacing-5);
}

.code-info-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.code-info-text {
    font-size: .8rem;
    color: var(--gray-500);
}

.code-info-email {
    font-size: .9rem;
    font-weight: 600;
    color: var(--gray-900);
}

.btn-link {
    margin-left: auto;
    background: none;
    border: none;
    color: var(--primary-900);
    font-size: .8rem;
    cursor: pointer;
    font-family: inherit;
}

.code-input-row {
    display: flex;
    gap: var(--spacing-3);
}

    .code-input-row input {
        flex: 1;
    }

.resend-row {
    display: flex;
    justify-content: flex-end;
    margin-top: var(--spacing-2);
}

.btn-resend {
    background: none;
    border: none;
    color: var(--primary-900);
    font-size: .8rem;
    cursor: pointer;
    font-family: inherit;
}

    .btn-resend:disabled {
        color: var(--gray-400);
        cursor: default;
    }

.spinner {
    display: inline-block;
    width: 14px;
    height: 14px;
    border: 2px solid rgba(255,255,255,.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin .7s linear infinite;
}

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

@media (max-width:768px) {
    .login-inner {
        grid-template-columns: 1fr;
    }

    .login-brand {
        display: none;
    }

    .login-form-area {
        padding: var(--spacing-6);
    }
}