/* ==========================================================================
   BT Auth 登录/注册页面样式（bt-auth- 前缀）
   ========================================================================== */

/* --- 页面容器 --- */
.bt-auth-page {
    min-height: calc(100vh - var(--bt-header-height) - 200px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--bt-space-3xl) var(--bt-space-md);
    background: var(--bt-bg-secondary);
}

/* --- 卡片 --- */
.bt-auth-card {
    width: 100%;
    max-width: 420px;
    background: var(--bt-bg-primary);
    border-radius: var(--bt-radius-xl);
    box-shadow: var(--bt-shadow-lg);
    padding: var(--bt-space-2xl) var(--bt-space-xl);
    position: relative;
}

/* --- Logo 区域 --- */
.bt-auth-logo {
    text-align: center;
    margin-bottom: var(--bt-space-xl);
}

.bt-auth-logo-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--bt-space-md);
}

.bt-auth-logo-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--bt-text-primary);
    margin: 0 0 var(--bt-space-xs);
    letter-spacing: -0.02em;
}

.bt-auth-logo-tagline {
    font-size: 0.875rem;
    color: var(--bt-text-secondary);
    margin: 0;
}

/* --- Tab 切换 --- */
.bt-auth-tabs {
    display: flex;
    border-bottom: 2px solid var(--bt-bg-tertiary);
    margin-bottom: var(--bt-space-lg);
    gap: 0;
}

.bt-auth-tab {
    flex: 1;
    padding: var(--bt-space-md) 0;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    font-size: 0.938rem;
    font-weight: 500;
    color: var(--bt-text-muted);
    cursor: pointer;
    transition: var(--bt-transition-fast);
    font-family: var(--bt-font-family);
    text-align: center;
}

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

.bt-auth-tab.active {
    background: var(--bt-primary);
    color: #ffffff;
    border-bottom-color: var(--bt-primary);
    font-weight: 600;
    border-radius: 6px 6px 0 0;
}

/* --- 面板（登录/注册内容区） --- */
.bt-auth-panel {
    display: none;
    animation: btAuthFadeIn 0.3s ease;
}

.bt-auth-panel.active {
    display: block;
}

@keyframes btAuthFadeIn {
    from {
        opacity: 0;
        transform: translateY(6px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* --- 表单通用 --- */
.bt-auth-form {
    position: relative;
}

.bt-auth-field {
    margin-bottom: var(--bt-space-md);
}

/* --- 输入框容器 --- */
.bt-auth-input-wrap {
    position: relative;
    display: flex;
    align-items: center;
}

.bt-auth-input-icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    align-items: center;
    color: var(--bt-text-muted);
    pointer-events: none;
    transition: var(--bt-transition-fast);
    z-index: 1;
    width: 18px;
    flex-shrink: 0;
}

.bt-auth-input {
    width: 100%;
    height: 48px;
    padding: 0 14px 0 52px;
    border: 1.5px solid var(--bt-border);
    border-radius: var(--bt-radius-md);
    background: #f5f7fa;
    font-size: 0.938rem;
    color: var(--bt-text-primary);
    font-family: var(--bt-font-family);
    transition: var(--bt-transition-fast);
    outline: none;
    box-sizing: border-box;
}

.bt-auth-input::placeholder {
    color: var(--bt-text-muted);
}

.bt-auth-input:hover {
    border-color: var(--bt-text-muted);
}

.bt-auth-input:focus {
    border-color: var(--bt-primary);
    background: var(--bt-bg-primary);
    box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.1);
}

.bt-auth-input:focus ~ .bt-auth-input-icon,
.bt-auth-input:focus + .bt-auth-input-icon {
    color: var(--bt-primary);
}

/* 当输入框有密码切换按钮时，右侧留出空间 */
.bt-auth-input-wrap .bt-auth-toggle-pwd + .bt-auth-input,
.bt-auth-input-wrap .bt-auth-input:has(+ .bt-auth-toggle-pwd) {
    padding-right: 48px;
}

/* 修正：input 在 icon 之后，toggle 在 input 之后 */
.bt-auth-input-wrap .bt-auth-input {
    padding-right: 14px;
}

.bt-auth-input-wrap:has(.bt-auth-toggle-pwd) .bt-auth-input {
    padding-right: 48px;
}

/* --- 密码显示/隐藏按钮 --- */
.bt-auth-toggle-pwd {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: none;
    border: none;
    border-radius: var(--bt-radius-sm);
    color: var(--bt-text-muted);
    cursor: pointer;
    transition: var(--bt-transition-fast);
    padding: 0;
    z-index: 1;
}

.bt-auth-toggle-pwd:hover {
    color: var(--bt-text-secondary);
    background: var(--bt-bg-tertiary);
}

/* --- 记住我 + 忘记密码 --- */
.bt-auth-options {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--bt-space-lg);
}

.bt-auth-remember {
    display: flex;
    align-items: center;
    gap: var(--bt-space-sm);
    cursor: pointer;
    font-size: 0.875rem;
    color: var(--bt-text-secondary);
    user-select: none;
}

.bt-auth-remember input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--bt-primary);
    cursor: pointer;
}

.bt-auth-forgot {
    font-size: 0.875rem;
    color: var(--bt-primary);
    text-decoration: none;
    transition: var(--bt-transition-fast);
}

.bt-auth-forgot:hover {
    color: var(--bt-primary-dark);
    text-decoration: underline;
}

/* --- 按钮 --- */
.bt-auth-btn {
    width: 100%;
    height: 48px;
    border: none;
    border-radius: var(--bt-radius-md);
    font-size: 1rem;
    font-weight: 600;
    font-family: var(--bt-font-family);
    cursor: pointer;
    transition: var(--bt-transition);
    display: flex;
    align-items: center;
    justify-content: center;
    outline: none;
}

.bt-auth-btn-primary {
    background: var(--bt-primary);
    color: #ffffff;
}

.bt-auth-btn-primary:hover {
    background: var(--bt-primary-dark);
    box-shadow: 0 4px 12px rgba(26, 115, 232, 0.3);
    transform: translateY(-1px);
}

.bt-auth-btn-primary:active {
    transform: translateY(0);
    box-shadow: none;
}

.bt-auth-btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* --- 消息提示 --- */
.bt-auth-alert {
    display: flex;
    align-items: center;
    gap: var(--bt-space-sm);
    padding: var(--bt-space-md);
    border-radius: var(--bt-radius-md);
    margin-bottom: var(--bt-space-md);
    font-size: 0.875rem;
    line-height: 1.5;
    animation: btAuthFadeIn 0.3s ease;
}

.bt-auth-alert svg {
    flex-shrink: 0;
}

.bt-auth-alert-error {
    background: #fff5f5;
    color: #c62828;
    border: 1px solid #ffcdd2;
}

.bt-auth-alert-success {
    background: #f1fff4;
    color: #2e7d32;
    border: 1px solid #c8e6c9;
}

/* --- 密码强度指示器 --- */
.bt-auth-pwd-strength {
    margin-top: var(--bt-space-sm);
}

.bt-auth-pwd-strength-bar {
    width: 100%;
    height: 4px;
    background: var(--bt-bg-tertiary);
    border-radius: var(--bt-radius-full);
    overflow: hidden;
}

.bt-auth-pwd-strength-fill {
    height: 100%;
    width: 0%;
    border-radius: var(--bt-radius-full);
    background: transparent;
    transition: width 0.3s ease, background-color 0.3s ease;
}

.bt-auth-pwd-strength-text {
    font-size: 0.75rem;
    margin-top: var(--bt-space-xs);
    min-height: 1em;
}

/* --- 密码需求列表 --- */
.bt-auth-pwd-requirements {
    list-style: none;
    padding: 0;
    margin: var(--bt-space-sm) 0 0;
    display: flex;
    flex-wrap: wrap;
    gap: var(--bt-space-sm) var(--bt-space-md);
}

.bt-auth-pwd-requirements li {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 0.75rem;
    color: var(--bt-text-muted);
    transition: var(--bt-transition-fast);
}

.bt-auth-pwd-requirements li svg {
    opacity: 0.3;
    transition: var(--bt-transition-fast);
}

.bt-auth-pwd-requirements li.met {
    color: var(--bt-success);
}

.bt-auth-pwd-requirements li.met svg {
    opacity: 1;
    stroke: var(--bt-success);
}

/* --- 确认密码错误提示 --- */
.bt-auth-field-error {
    font-size: 0.813rem;
    color: #c62828;
    margin-top: var(--bt-space-xs);
    padding-left: 2px;
}

/* --- 用户协议复选框 --- */
.bt-auth-agreement {
    display: flex;
    align-items: flex-start;
    gap: var(--bt-space-sm);
    cursor: pointer;
    user-select: none;
    font-size: 0.813rem;
    line-height: 1.5;
}

.bt-auth-agreement input[type="checkbox"] {
    display: none;
}

.bt-auth-agreement-check {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    min-width: 18px;
    border: 1.5px solid var(--bt-border);
    border-radius: 4px;
    background: #f5f7fa;
    transition: var(--bt-transition-fast);
    margin-top: 1px;
}

.bt-auth-agreement-check svg {
    opacity: 0;
    transform: scale(0.5);
    transition: var(--bt-transition-fast);
    stroke: #ffffff;
}

.bt-auth-agreement input[type="checkbox"]:checked + .bt-auth-agreement-check {
    background: var(--bt-primary);
    border-color: var(--bt-primary);
}

.bt-auth-agreement input[type="checkbox"]:checked + .bt-auth-agreement-check svg {
    opacity: 1;
    transform: scale(1);
}

.bt-auth-agreement-text {
    color: var(--bt-text-secondary);
}

.bt-auth-agreement-text a {
    color: var(--bt-primary);
    text-decoration: none;
    transition: var(--bt-transition-fast);
}

.bt-auth-agreement-text a:hover {
    text-decoration: underline;
    color: var(--bt-primary-dark);
}

/* --- 注册禁用提示 --- */
.bt-auth-register-disabled {
    text-align: center;
    padding: var(--bt-space-2xl) var(--bt-space-md);
}

.bt-auth-register-disabled svg {
    margin-bottom: var(--bt-space-md);
    opacity: 0.5;
}

.bt-auth-register-disabled p {
    color: var(--bt-text-secondary);
    font-size: 0.938rem;
    margin: 0;
}

/* --- 响应式 --- */
@media (max-width: 480px) {
    .bt-auth-page {
        padding: var(--bt-space-lg) var(--bt-space-md);
        align-items: flex-start;
        padding-top: var(--bt-space-xl);
    }

    .bt-auth-card {
        padding: var(--bt-space-xl) var(--bt-space-lg);
        border-radius: var(--bt-radius-lg);
    }

    .bt-auth-logo-title {
        font-size: 1.5rem;
    }

    .bt-auth-tab {
        font-size: 0.875rem;
    }
}

@media (max-width: 360px) {
    .bt-auth-card {
        padding: var(--bt-space-lg) var(--bt-space-md);
    }

    .bt-auth-options {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--bt-space-sm);
    }

    .bt-auth-pwd-requirements {
        flex-direction: column;
        gap: var(--bt-space-xs);
    }
}

/* --- 暗色模式适配 --- */
[data-theme="dark"] .bt-auth-input {
    background: var(--bt-bg-secondary);
    border-color: var(--bt-border);
    color: var(--bt-text-primary);
}

[data-theme="dark"] .bt-auth-input:focus {
    background: var(--bt-bg-secondary);
    box-shadow: 0 0 0 3px rgba(74, 158, 255, 0.15);
}

[data-theme="dark"] .bt-auth-agreement-check {
    background: var(--bt-bg-secondary);
    border-color: var(--bt-border);
}

[data-theme="dark"] .bt-auth-alert-error {
    background: rgba(255, 23, 68, 0.1);
    border-color: rgba(255, 23, 68, 0.2);
    color: #ff5252;
}

[data-theme="dark"] .bt-auth-alert-success {
    background: rgba(0, 200, 83, 0.1);
    border-color: rgba(0, 200, 83, 0.2);
    color: #69f0ae;
}

[data-theme="dark"] .bt-auth-toggle-pwd:hover {
    background: var(--bt-bg-tertiary);
}

/* ==========================================================================
   BT Auth Phone SMS & Invite Code Fields
   ========================================================================== */
.bt-auth-label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--bt-text-secondary);
    margin-bottom: 6px;
}

.bt-auth-phone-wrap {
    display: flex;
    gap: 8px;
    align-items: stretch;
}
.bt-auth-phone-wrap .bt-auth-input {
    flex: 1;
}
.bt-auth-sms-btn {
    flex-shrink: 0;
    padding: 0 16px;
    background: var(--bt-primary, #1a73e8);
    color: #fff;
    border: none;
    border-radius: 6px;
    font-size: 13px;
    cursor: pointer;
    white-space: nowrap;
    transition: opacity 0.2s;
    min-width: 100px;
    text-align: center;
    height: 48px;
    line-height: 48px;
    box-sizing: border-box;
}
.bt-auth-sms-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}
.bt-auth-sms-btn:hover:not(:disabled) {
    opacity: 0.9;
}
.bt-auth-optional {
    font-size: 12px;
    color: #94a3b8;
    font-weight: normal;
}

[data-theme="dark"] .bt-auth-sms-btn {
    background: var(--bt-primary);
}
[data-theme="dark"] .bt-auth-optional {
    color: var(--bt-text-muted);
}

/* ==========================================================================
   移动端导航面板样式（bt-mobile-nav）
   ========================================================================== */
.bt-mobile-nav {
    position: fixed;
    top: var(--bt-header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bt-bg-primary);
    z-index: 999;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    box-shadow: var(--bt-shadow-lg);
}

.bt-mobile-nav-inner {
    padding: var(--bt-space-md);
}

.bt-mobile-nav-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.bt-mobile-nav-list li {
    border-bottom: 1px solid var(--bt-border);
}

.bt-mobile-nav-list li:last-child {
    border-bottom: none;
}

.bt-mobile-nav-list a {
    display: block;
    padding: var(--bt-space-md) var(--bt-space-lg);
    color: var(--bt-text-primary);
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    transition: var(--bt-transition-fast);
    border-radius: var(--bt-radius-md);
}

.bt-mobile-nav-list a:hover,
.bt-mobile-nav-list a:focus {
    background: var(--bt-bg-secondary);
    color: var(--bt-primary);
}

.bt-mobile-nav-list .current-menu-item > a,
.bt-mobile-nav-list .current_page_item > a {
    color: var(--bt-primary);
    background: var(--bt-primary-bg);
    font-weight: 600;
}

/* 移动端导航 - 子菜单 */
.bt-mobile-nav-list .sub-menu {
    list-style: none;
    padding: 0;
    margin: 0;
    background: var(--bt-bg-secondary);
    border-radius: var(--bt-radius-md);
    margin-bottom: var(--bt-space-sm);
}

.bt-mobile-nav-list .sub-menu li {
    border-bottom: 1px solid var(--bt-border);
}

.bt-mobile-nav-list .sub-menu li:last-child {
    border-bottom: none;
}

.bt-mobile-nav-list .sub-menu a {
    padding: var(--bt-space-sm) var(--bt-space-xl);
    font-size: 0.875rem;
    color: var(--bt-text-secondary);
}

.bt-mobile-nav-list .sub-menu a:hover {
    color: var(--bt-primary);
    background: transparent;
}

/* 汉堡菜单动画 - 打开状态 */
.bt-mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.bt-mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.bt-mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* --- 忘记密码面板 --- */
.bt-auth-forgot-desc {
    text-align: center;
    color: var(--bt-text-muted, #999);
    font-size: 0.875rem;
    margin: 0 0 20px;
    line-height: 1.5;
}

.bt-auth-back-link {
    text-align: center;
    margin-top: 16px;
}

.bt-auth-back-link a {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    color: var(--bt-text-muted, #999);
    font-size: 0.813rem;
    text-decoration: none;
    transition: color 0.15s;
}

.bt-auth-back-link a:hover {
    color: var(--bt-accent, #6366f1);
}