/* ============================================================
   用户端 - 认证页面样式（登录 / 注册）
   包含：认证卡片布局、Tab 切换、表单控件、成功提示、Toast
   依赖：base.css（CSS 变量）
   ============================================================ */

/* ===== 认证页面整体布局 ===== */
.auth-page {
    min-height: 100vh;
    background: var(--color-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl);
}

.auth-card {
    width: 100%;
    max-width: 420px;
    background: var(--color-card);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

/* ===== 认证页头部（Logo + 副标题） ===== */
.auth-header {
    text-align: center;
    padding: var(--spacing-3xl) var(--spacing-2xl) var(--spacing-xl);
}

.auth-logo {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
}

.auth-logo .icon {
    color: var(--color-primary);
}

.auth-subtitle {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

/* ===== Tab 切换 ===== */
.auth-tabs {
    display: flex;
    border-bottom: 1px solid var(--color-border);
    padding: 0 var(--spacing-2xl);
}

.auth-tab {
    flex: 1;
    padding: var(--spacing-md) var(--spacing-lg);
    text-align: center;
    font-size: var(--font-size-md);
    font-weight: 500;
    color: var(--color-text-muted);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all var(--transition-fast);
    background: none;
    border-top: none;
    border-left: none;
    border-right: none;
}

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

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

/* ===== 认证页隐藏状态 ===== */
.auth-tabs-hidden {
    display: none;
}

.auth-footer-hidden {
    display: none;
}

/* ===== 表单区域 ===== */
.auth-body {
    padding: var(--spacing-2xl);
}

.auth-form {
    display: none;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.auth-form.active {
    display: flex;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.form-label {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
}

.form-input {
    width: 100%;
    height: 44px;
    padding: 0 var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    color: var(--color-text-primary);
    background: var(--color-card);
    transition: border-color var(--transition-fast);
    outline: none;
}

.form-input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

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

/* ===== 表单输入框错误状态 ===== */
.form-input.error {
    border-color: var(--color-danger);
}

.form-hint {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

.form-error {
    font-size: var(--font-size-xs);
    color: var(--color-danger);
    min-height: 18px;
}

/* ===== 提交按钮 ===== */
.auth-submit {
    width: 100%;
    height: 44px;
    border: none;
    border-radius: var(--radius-md);
    background: var(--color-primary);
    color: var(--color-text-white);
    font-size: var(--font-size-md);
    font-weight: 500;
    cursor: pointer;
    transition: background var(--transition-fast);
    margin-top: var(--spacing-sm);
}

.auth-submit:hover {
    background: var(--color-primary-hover);
}

.auth-submit:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* ===== 表单底部文字 ===== */
.auth-footer {
    text-align: center;
    padding: 0 var(--spacing-2xl) var(--spacing-2xl);
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.auth-footer a {
    color: var(--color-primary);
    cursor: pointer;
}

.auth-footer a:hover {
    text-decoration: underline;
}

/* ===== 成功提示面板 ===== */
.auth-success {
    display: none;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-lg);
    padding: var(--spacing-2xl) 0;
    text-align: center;
}

.auth-success.active {
    display: flex;
}

.auth-success .check-icon {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: var(--color-success-light);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-success);
}

.auth-success .success-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text-primary);
}

/* ===== Toast 提示容器 ===== */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 10000;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.toast {
    padding: 10px 16px;
    margin-bottom: 8px;
    border-radius: 6px;
    font-size: 13px;
    animation: fadeIn 0.3s ease;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.toast-error {
    background: #EF4444;
    color: #fff;
}

.toast-success {
    background: #10B981;
    color: #fff;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-8px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ===== 微信登录 ===== */
.wechat-login {
    margin-top: var(--spacing-lg);
}

.wechat-divider {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    color: var(--color-text-muted, #9CA3AF);
    font-size: var(--font-size-xs, 12px);
}

.wechat-divider::before,
.wechat-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--color-border, #E5E7EB);
}

.wechat-entry {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    width: 100%;
    padding: 11px 16px;
    border: 1px solid var(--color-border, #E5E7EB);
    border-radius: var(--radius-md, 8px);
    background: var(--color-card, #fff);
    color: #07C160;
    font-size: var(--font-size-sm, 14px);
    font-weight: 500;
    cursor: pointer;
    transition: border-color .2s ease, background-color .2s ease;
    user-select: none;
}

.wechat-entry:hover {
    border-color: #07C160;
    background: rgba(7, 193, 96, .06);
}

.wechat-entry:focus-visible {
    outline: 2px solid #07C160;
    outline-offset: 2px;
}

.wechat-entry.is-loading {
    opacity: .6;
    pointer-events: none;
}

.wechat-icon {
    flex-shrink: 0;
}

.wechat-hint {
    margin: var(--spacing-sm) 0 0;
    font-size: var(--font-size-xs, 12px);
    color: var(--color-text-muted, #9CA3AF);
    text-align: center;
}

/* ===== 微信扫码弹层 ===== */
.wechat-modal {
    position: fixed;
    inset: 0;
    z-index: 20000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.wechat-modal[hidden] {
    display: none;
}

.wechat-modal-mask {
    position: absolute;
    inset: 0;
    background: rgba(17, 24, 39, .55);
}

.wechat-modal-body {
    position: relative;
    width: 300px;
    max-width: calc(100vw - 32px);
    padding: var(--spacing-xl, 24px);
    background: var(--color-card, #fff);
    border-radius: var(--radius-lg, 12px);
    box-shadow: var(--shadow-lg, 0 10px 40px rgba(0,0,0,.2));
    text-align: center;
}

.wechat-modal-close {
    position: absolute;
    top: 6px;
    right: 10px;
    border: 0;
    background: transparent;
    font-size: 24px;
    line-height: 1;
    color: var(--color-text-muted, #9CA3AF);
    cursor: pointer;
}

.wechat-modal-close:hover {
    color: var(--color-text-primary, #111827);
}

.wechat-modal-title {
    margin-bottom: var(--spacing-md, 16px);
    font-size: var(--font-size-base, 15px);
    font-weight: 600;
    color: var(--color-text-primary, #111827);
}

.wechat-qr-frame {
    width: 200px;
    height: 200px;
    margin: 0 auto;
    border-radius: 8px;
    overflow: hidden;
    background: #F3F4F6;
    position: relative;
}

.wechat-qr-frame iframe {
    width: 200px;
    height: 200px;
    border: 0;
    display: block;
}

.wechat-qr-frame.is-loading::after {
    content: '加载中...';
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    color: var(--color-text-muted, #9CA3AF);
}

.wechat-qr-frame.is-error::after {
    content: '二维码加载失败，请稍后重试';
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 16px;
    font-size: 13px;
    line-height: 1.6;
    color: #EF4444;
    background: #FEF2F2;
}

.wechat-modal-tip {
    margin-top: var(--spacing-md, 16px);
    font-size: var(--font-size-xs, 12px);
    line-height: 1.6;
    color: var(--color-text-muted, #9CA3AF);
}