/* ========================================
   Login Page - 登录页面样式
   ======================================== */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #f5f7fb;
    padding: var(--spacing-lg);
}

.login-container {
    width: 480px;
    max-width: 100%;
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
    overflow: hidden;
    position: relative;
    animation: fadeInUp 0.4s ease;
    display: grid;
    grid-template-columns: 1fr;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-header {
    padding: var(--spacing-2xl) var(--spacing-2xl) var(--spacing-md);
    text-align: center;
}

.login-logo {
    width: 52px;
    height: 52px;
    background: linear-gradient(135deg, #6366f1, #818cf8);
    border-radius: var(--radius-lg);
    margin: 0 auto var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: #fff;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.login-header h1 {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.login-header p {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    margin: 0;
}

.login-tabs {
    display: flex;
    padding: 0 var(--spacing-2xl);
    border-bottom: 1px solid var(--border-color);
}

.login-tab {
    flex: 1;
    padding: var(--spacing-md) var(--spacing-lg);
    text-align: center;
    font-weight: 600;
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    cursor: pointer;
    transition: all var(--transition-fast);
    border-bottom: 2px solid transparent;
    background: none;
    border-top: none;
    border-left: none;
    border-right: none;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.login-tab:hover {
    color: var(--text-secondary);
}

.login-tab.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.login-tab i {
    font-size: 15px;
}

.login-form-container {
    padding: var(--spacing-xl) var(--spacing-2xl) var(--spacing-2xl);
    min-width: 0;
    overflow: hidden;
}

.login-form {
    display: none;
    min-width: 0;
    max-width: 100%;
}

.login-form.active {
    display: block;
    animation: fadeIn 0.25s ease;
}

.login-form * {
    max-width: 100%;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

#loginForm {
    padding-top: var(--spacing-md);
}

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

.login-form .form-label {
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 6px;
    display: block;
}

.login-form .input-group {
    position: relative;
    width: 100%;
}

.login-form .form-input {
    width: 100%;
    box-sizing: border-box;
}

.login-form .input-group > i:first-child:not(.input-action) {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 16px;
    z-index: 1;
    pointer-events: none;
}

.login-form .input-group .form-input {
    padding-left: 40px;
    height: 44px;
    font-size: var(--font-size-sm);
}

.login-form .input-group.has-action .form-input {
    padding-right: 40px;
}

.input-action {
    position: absolute;
    right: 4px;
    top: 50%;
    transform: translateY(-50%);
    width: 34px;
    height: 34px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    transition: color var(--transition-fast);
    z-index: 2;
    border-radius: var(--radius-md);
}

.input-action:hover {
    color: var(--text-secondary);
    background: var(--bg-tertiary);
}

.input-feedback {
    font-size: var(--font-size-xs);
    margin-top: 4px;
    display: flex;
    align-items: center;
    gap: 4px;
    min-height: 16px;
    transition: all var(--transition-fast);
}

.input-feedback.checking {
    color: var(--primary-color);
}

.input-feedback.success {
    color: var(--success-color);
}

.input-feedback.error {
    color: var(--danger-color);
}

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

.login-form .input-group .form-input.error {
    border-color: var(--danger-color);
}

.login-form .btn-lg {
    height: 46px;
    font-size: var(--font-size-md);
    margin-top: var(--spacing-md);
}

.captcha-row {
    display: flex;
    gap: var(--spacing-sm);
    align-items: stretch;
}

.captcha-row .input-group {
    flex: 1;
    min-width: 0;
}

.captcha-row .form-input {
    width: 100%;
}

.captcha-btn {
    padding: 0 16px;
    background: var(--primary-gradient);
    color: var(--text-white);
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-xs);
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
    height: 44px;
    transition: all var(--transition-fast);
}

.captcha-btn:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

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

.forgot-password {
    text-align: right;
    margin-top: var(--spacing-sm);
}

.forgot-password a {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

.slider-captcha {
    margin-bottom: var(--spacing-md);
    display: none;
}

.slider-captcha.show {
    display: block;
    animation: fadeIn 0.3s ease;
}

.slider-captcha-label {
    display: block;
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.slider-container {
    position: relative;
    width: 100%;
    height: 40px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
    border: 2px solid var(--border-color);
    transition: border-color var(--transition-fast);
}

.slider-container.success {
    border-color: var(--success-color);
    background: rgba(16, 185, 129, 0.05);
}

.slider-container.fail {
    border-color: var(--danger-color);
    background: rgba(239, 68, 68, 0.05);
}

.slider-track {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    background: var(--primary-gradient);
    border-radius: var(--radius-full);
    width: 0;
    transition: width 0.1s;
}

.slider-container.success .slider-track {
    background: linear-gradient(135deg, #10b981 0%, #34d399 100%);
}

.slider-thumb {
    position: absolute;
    top: 2px;
    left: 2px;
    width: 36px;
    height: 36px;
    background: var(--bg-primary);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
    transition: left 0.1s;
    z-index: 2;
    user-select: none;
}

.slider-thumb i {
    font-size: 16px;
    color: var(--primary-color);
    transition: color var(--transition-fast);
}

.slider-container.success .slider-thumb i {
    color: var(--success-color);
}

.slider-text {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    pointer-events: none;
    user-select: none;
}

.slider-container.success .slider-text {
    color: var(--success-color);
}

.slider-container.fail .slider-text {
    color: var(--danger-color);
}

.slider-tip {
    font-size: var(--font-size-xs);
    margin-top: 4px;
    display: none;
}

.slider-tip.show {
    display: block;
}

.slider-tip.success {
    color: var(--success-color);
}

.slider-tip.fail {
    color: var(--danger-color);
}

.login-footer {
    padding: var(--spacing-md) var(--spacing-xl);
    text-align: center;
    border-top: 1px solid var(--border-color);
}

.login-footer p {
    font-size: 11px;
    color: var(--text-muted);
    margin: 0;
}

.login-features {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-top: 6px;
    flex-wrap: wrap;
}

.login-feature {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 11px;
    color: var(--text-muted);
}

.login-feature i {
    color: var(--primary-color);
    font-size: 11px;
}

.error-message {
    font-size: var(--font-size-xs);
    color: var(--danger-color);
    margin-top: var(--spacing-xs);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

@media (max-width: 480px) {
    .login-page {
        padding: 0;
        align-items: flex-start;
    }

    .login-container {
        max-width: 100%;
        border-radius: 0;
        min-height: 100vh;
        box-shadow: none;
    }

    .login-header {
        padding: var(--spacing-2xl) var(--spacing-lg) var(--spacing-md);
    }

    .login-form-container {
        padding: var(--spacing-md) var(--spacing-lg) var(--spacing-lg);
    }

    .login-features {
        flex-direction: column;
        gap: 4px;
    }
}