/* ===== CRMoment Web App - Material Design 3 风格 ===== */

:root {
    --md-sys-color-primary: #6750a4;
    --md-sys-color-on-primary: #ffffff;
    --md-sys-color-primary-container: #eaddff;
    --md-sys-color-on-primary-container: #21005d;
    --md-sys-color-secondary: #625b71;
    --md-sys-color-surface: #fef7ff;
    --md-sys-color-surface-container-low: #f7f2fa;
    --md-sys-color-surface-container: #f3edf7;
    --md-sys-color-surface-container-high: #ece6f0;
    --md-sys-color-outline-variant: #cac4d0;
    --md-sys-color-on-surface: #1d1b20;
    --md-sys-color-on-surface-variant: #49454f;
    --md-sys-color-outline: #79747e;
    --md-sys-color-error: #b3261e;
    --md-elevation-level1: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.08);
    --md-elevation-level2: 0 3px 6px rgba(0,0,0,0.14), 0 2px 4px rgba(0,0,0,0.10);
    --md-elevation-level3: 0 6px 12px rgba(0,0,0,0.16), 0 3px 6px rgba(0,0,0,0.12);
    --content-max-width: 680px;
    /* 滚动条颜色（浅色） */
    --scrollbar-track: #f5f0fa;
    --scrollbar-thumb: #c4b5d0;
    --scrollbar-thumb-hover: #b09ec2;
}

/* ===== 深色模式 ===== */
[data-theme="dark"] {
    --md-sys-color-primary: #d0bcff;
    --md-sys-color-on-primary: #381e72;
    --md-sys-color-primary-container: #4f378b;
    --md-sys-color-on-primary-container: #eaddff;
    --md-sys-color-secondary: #ccc2dc;
    --md-sys-color-surface: #141218;
    --md-sys-color-surface-container-low: #1e1c22;
    --md-sys-color-surface-container: #211f26;
    --md-sys-color-surface-container-high: #2a2730;
    --md-sys-color-on-surface: #e6e0e9;
    --md-sys-color-on-surface-variant: #cac4d0;
    --md-sys-color-outline: #938f99;
    --md-sys-color-error: #f2b8b5;
    --md-elevation-level1: 0 1px 3px rgba(0,0,0,0.4), 0 1px 2px rgba(0,0,0,0.3);
    --md-elevation-level2: 0 3px 6px rgba(0,0,0,0.48), 0 2px 4px rgba(0,0,0,0.36);
    --md-elevation-level3: 0 6px 12px rgba(0,0,0,0.52), 0 3px 6px rgba(0,0,0,0.4);
    /* 滚动条颜色（深色） */
    --scrollbar-track: #2d2a33;
    --scrollbar-thumb: #6a6478;
    --scrollbar-thumb-hover: #7e7890;
}

[data-theme="dark"] body {
    background: #141218;
}

[data-theme="dark"] #app-bar {
    border-bottom: 1px solid #2d2a33;
}


[data-theme="dark"] .post-avatar {
    background: #333;
}

[data-theme="dark"] .post-actions {
    border-top-color: #2d2a33;
}

[data-theme="dark"] .post-actions .action-btn:hover {
    background: #2a2640;
}


[data-theme="dark"] .notif-item {
    border-bottom-color: #2d2a33;
}

[data-theme="dark"] .comment-item {
    border-bottom-color: #2d2a33;
}

[data-theme="dark"] .comment-item .comment-avatar {
    background: #333;
}

[data-theme="dark"] .comment-input {
    border-color: #3a3640;
    background: #1e1c22;
    color: var(--md-sys-color-on-surface, #e6e0e9);
}

[data-theme="dark"] .comment-input:focus {
    background: #1e1c22;
    color: var(--md-sys-color-on-surface, #e6e0e9);
    border-color: var(--md-sys-color-primary, #d0bcff);
}

[data-theme="dark"] .skeleton {
    background: linear-gradient(90deg, #2a2730 25%, #33303a 50%, #2a2730 75%);
    background-size: 200% 100%;
}

[data-theme="dark"] .app-title-light { display: none !important; }
[data-theme="dark"] .app-title-dark  { display: inline !important; }

[data-theme="dark"] md-dialog {
    --md-dialog-container-color: #1e1c22;
}

[data-theme="dark"] #composer-dialog .composer-field {
    border-color: #3a3640;
    background: #141218;
}

[data-theme="dark"] #composer-dialog .composer-field:focus {
    background: #141218;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

/* ===== 自定义滚动条 ===== */
/* Firefox */
* {
    scrollbar-color: var(--scrollbar-thumb, #c4b5d0) var(--scrollbar-track, #f5f0fa);
    scrollbar-width: thin;
}

/* WebKit (Chrome, Edge, Safari) */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: var(--scrollbar-track, #f5f0fa);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb, #c4b5d0);
    border-radius: 3px;
    transition: background 0.2s;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--scrollbar-thumb-hover, #b09ec2);
}

html, body {
    font-family: 'Roboto', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--md-sys-color-surface);
    color: var(--md-sys-color-on-surface);
    height: 100%;
    -webkit-font-smoothing: antialiased;
    transition: background 0.35s ease, color 0.35s ease;
}

/* ===== 顶部导航栏（粘性，始终可见） ===== */
#app-bar {
    position: sticky;
    top: 0;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 52px;
    padding: 0 16px;
    background: var(--md-sys-color-surface, #fef7ff);
    border-bottom: 1px solid #e0e0e0;
    box-shadow: 0 1px 2px rgba(0,0,0,0.06);
    transition: background 0.35s ease, border-color 0.35s ease;
}

/* 对话框打开时降低导航栏 z-index，使 MWC dialog shadow DOM 中的遮罩层盖过导航栏 */
body.dialog-open #app-bar {
    z-index: 0;
}

.top-bar-right {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* ===== Logo（图片） ===== */
.app-title {
    height: 48px;
    width: auto;
    display: block;
}

/* ===== 二级导航栏（正常放置，滚动时自然上移） ===== */
.sub-nav {
    display: flex;
    justify-content: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--md-sys-color-surface, #fffefb);
    /* border-bottom removed — 无黑色边线 */
}
.nav-btn { --md-text-button-label-text-color: var(--md-sys-color-on-surface-variant); }
.nav-btn.active { --md-text-button-label-text-color: var(--md-sys-color-primary); }
.nav-btn.active md-icon { color: var(--md-sys-color-primary); }

.nav-auth, .nav-user { display: flex; align-items: center; gap: 8px; }

.avatar-small {
    width: 32px; height: 32px; border-radius: 50%;
    object-fit: cover; background: #e0e0e0;
    border: 2px solid transparent;
    transition: border-color 0.2s;
}
md-icon-button:hover .avatar-small {
    border-color: var(--md-sys-color-primary);
}

/* ===== 主内容区 ===== */
.main-content {
    max-width: var(--content-max-width);
    margin: 0 auto;
    padding: 16px;
    padding-top: 72px;
    min-height: 100vh;
}

/* ===== 动态卡片 ===== */
.post-card {
    background: var(--md-sys-color-surface-container-low, #f7f2fa);
    border-radius: 16px;
    padding: 16px 20px;
    margin-bottom: 16px;
    box-shadow: var(--md-elevation-level1);
    transition: box-shadow 0.2s, background 0.35s ease;
    animation: fadeIn 0.3s ease;
}
.post-card:hover { box-shadow: var(--md-elevation-level2); }

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

.post-header {
    display: flex; align-items: center; gap: 12px;
    margin-bottom: 12px;
}

.post-avatar {
    width: 40px; height: 40px; border-radius: 50%;
    object-fit: cover; background: #e0e0e0;
    cursor: pointer;
    transition: background 0.35s ease;
}

.post-author {
    font-weight: 500; font-size: 15px; cursor: pointer;
}
.post-author:hover { color: var(--md-sys-color-primary); }

.post-badge {
    font-size: 11px; font-weight: 600;
    color: var(--md-sys-color-primary, #6750a4);
    background: color-mix(in srgb, var(--md-sys-color-primary, #6750a4) 12%, transparent);
    padding: 2px 8px; border-radius: 10px;
}

.post-time {
    font-size: 12px; color: var(--md-sys-color-on-surface-variant);
    margin-left: auto;
}

.post-content {
    font-size: 15px; line-height: 1.6;
    margin-bottom: 12px; white-space: pre-wrap;
    word-break: break-word;
}

.post-images {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 6px;
    margin-bottom: 12px;
}
.post-images:empty { display: none; }
.post-images img {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
    cursor: pointer;
    border-radius: 8px;
    transition: transform 0.2s;
}
.post-images img:hover { transform: scale(1.02); }
.post-images.single {
    grid-template-columns: 1fr;
    max-width: 300px;
}

.post-actions {
    display: flex; align-items: center; gap: 4px;
    padding-top: 8px; border-top: 1px solid #f0f0f0;
    transition: border-color 0.35s ease;
}
.post-actions .action-btn {
    display: flex; align-items: center; gap: 4px;
    padding: 4px 12px; border-radius: 20px;
    cursor: pointer; font-size: 13px; color: var(--md-sys-color-on-surface-variant);
    transition: background 0.2s;
    border: none; background: none;
    font-family: inherit;
}
.post-actions .action-btn:hover { background: #f0ebff; }
.post-actions .action-btn.liked { color: #e91e63; }
.post-actions .action-btn.liked md-icon { color: #e91e63; font-variation-settings: 'FILL' 1; }

/* ===== 动态加载提示 ===== */
.loading-indicator {
    text-align: center; padding: 40px 0; color: var(--md-sys-color-on-surface-variant);
}
.loading-indicator md-circular-progress { --md-circular-progress-size: 32px; }
.end-indicator {
    text-align: center; padding: 24px 0;
    color: var(--md-sys-color-on-surface-variant); font-size: 14px;
}

/* ===== 写动态区 ===== */
.composer-card {
    background: var(--md-sys-color-surface-container-low, #f7f2fa); border-radius: 16px;
    padding: 16px; margin-bottom: 20px;
    box-shadow: var(--md-elevation-level1);
    display: flex; align-items: center; gap: 12px;
    cursor: pointer;
    transition: box-shadow 0.2s, background 0.35s ease;
}
.composer-card:hover { box-shadow: var(--md-elevation-level2); }
.composer-card .composer-placeholder {
    flex: 1; color: var(--md-sys-color-on-surface-variant);
    font-size: 15px;
}

/* ===== 对话框通用 ===== */
md-dialog {
    --md-dialog-container-shape: 20px;
}

/* 对话框加宽，增大内容/按钮与边框的间距 */
md-dialog {
    max-width: min(640px, calc(100% - 32px)) !important;
}
/* headline 与 content/actions 的间距 */
md-dialog [slot="headline"] {
    padding-left: 24px !important;
    padding-top: 20px !important;
    padding-bottom: 8px !important;
}
/* content 区域左右内边距加大 */
md-dialog [slot="content"] {
    padding: 8px 24px !important;
}
/* 底部按钮区域：与左右边距及底部边距加大 */
md-dialog [slot="actions"] {
    padding: 12px 24px 20px !important;
    gap: 12px !important;
}

/* 所有按钮增加文字左右间距，避免中文按钮字紧贴边 */
/* 注意：MWC 对有图标和没图标的按钮使用不同的 CSS 变量 */
md-text-button,
md-filled-button,
md-outlined-button,
md-filled-tonal-button {
    /* 无图标：leading/trailing */
    --md-text-button-leading-space: 24px;
    --md-text-button-trailing-space: 24px;
    --md-filled-button-leading-space: 24px;
    --md-filled-button-trailing-space: 24px;
    --md-outlined-button-leading-space: 24px;
    --md-outlined-button-trailing-space: 24px;
    --md-filled-tonal-button-leading-space: 24px;
    --md-filled-tonal-button-trailing-space: 24px;
    /* 有图标（左侧图标） */
    --md-text-button-with-leading-icon-leading-space: 16px;
    --md-text-button-with-leading-icon-trailing-space: 24px;
    --md-filled-button-with-leading-icon-leading-space: 16px;
    --md-filled-button-with-leading-icon-trailing-space: 24px;
    --md-outlined-button-with-leading-icon-leading-space: 16px;
    --md-outlined-button-with-leading-icon-trailing-space: 24px;
    --md-filled-tonal-button-with-leading-icon-leading-space: 16px;
    --md-filled-tonal-button-with-leading-icon-trailing-space: 24px;
}
md-dialog::backdrop {
    background: rgba(0,0,0,0.3);
}
md-dialog form {
    display: flex;
    flex-direction: column;
    gap: 16px;
    min-width: unset;        /* 取消强制最小宽度，让内容自然撑开 */
    width: 100%;
}
/* 对话框内标签文本缩小 */
md-dialog md-outlined-text-field,
md-dialog md-outlined-textarea {
    --md-outlined-text-field-label-text-size: 14px;
    --md-outlined-text-field-input-text-size: 14px;
    --md-outlined-text-field-supporting-text-size: 12px;
    --md-outlined-textarea-label-text-size: 14px;
    --md-outlined-textarea-input-text-size: 14px;
    --md-outlined-textarea-supporting-text-size: 12px;
}
/* 对话框标题缩小并适当内缩 */
md-dialog [slot="headline"] {
    font-size: 18px;
    padding-left: 16px;
    padding-top: 8px;
}

/* ===== 登录对话框 ===== */
.auth-tabs { display: flex; gap: 0; margin-bottom: 8px; }
.auth-tab { flex: 1; --md-text-button-container-shape: 0; }
.auth-tab.active {
    --md-text-button-label-text-color: var(--md-sys-color-primary);
    border-bottom: 2px solid var(--md-sys-color-primary);
}
.auth-field { width: 100%; }
.error-message {
    color: var(--md-sys-color-error); font-size: 14px;
    padding: 8px 0;
}

/* ===== 发布对话框 ===== */
.composer-field {
    width: 100%;
    min-height: 120px;
    flex-shrink: 0;
    padding: 12px 16px;
    font-size: 15px;
    font-family: inherit;
    line-height: 1.5;
    border: 1px solid var(--md-sys-color-outline, #79747e);
    border-radius: 8px;
    outline: none;
    resize: vertical;
    background: transparent;
    color: var(--md-sys-color-on-surface, #1d1b20);
    box-sizing: border-box;
    transition: border-color 0.15s, box-shadow 0.15s;
}
.composer-field:focus {
    border-color: var(--md-sys-color-primary, #6750a4);
    border-width: 2px;
    padding: 11px 15px;  /* 保持总高度不变 */
}
.composer-field::placeholder {
    color: var(--md-sys-color-on-surface-variant, #49454f);
}
.composer-tools { display: flex; align-items: center; gap: 8px; }
.image-count { font-size: 13px; color: var(--md-sys-color-on-surface-variant); }
.image-preview {
    display: flex; flex-wrap: wrap; gap: 8px;
    margin-top: 8px;
}
.image-preview .preview-item {
    position: relative;
    width: 80px; height: 80px;
    cursor: pointer;
}
.image-preview .preview-item img {
    width: 100%; height: 100%; object-fit: cover;
    border-radius: 8px; border: 1px solid #e0e0e0;
}
.image-preview .preview-remove {
    position: absolute; top: -6px; right: -6px;
    width: 20px; height: 20px;
    background: var(--md-sys-color-error, #b3261e);
    color: #fff; border-radius: 50%;
    font-size: 14px; line-height: 20px;
    text-align: center;
    display: none;
    box-shadow: 0 1px 3px rgba(0,0,0,0.3);
}
.image-preview .preview-item:hover .preview-remove {
    display: block;
}

/* ===== 通知 ===== */
.notif-list { min-width: 320px; max-height: 400px; overflow-y: auto; }
.notif-item {
    display: flex; align-items: center; gap: 12px;
    padding: 12px 0; border-bottom: 1px solid #f0f0f0;
    transition: border-color 0.35s ease;
}
.notif-item:last-child { border-bottom: none; }
.notif-item .notif-text { flex: 1; font-size: 14px; line-height: 1.4; }
.notif-item .notif-time { font-size: 12px; color: var(--md-sys-color-on-surface-variant); }
.notif-item.unread { font-weight: 500; }
.notif-empty {
    text-align: center; padding: 40px 0;
    color: var(--md-sys-color-on-surface-variant);
}
.notif-section-title {
    font-size: 13px; font-weight: 600;
    color: var(--md-sys-color-primary, #6750a4);
    padding: 8px 0 4px;
    text-transform: uppercase; letter-spacing: 0.5px;
}
.notif-divider {
    height: 1px;
    background: var(--md-sys-color-outline, #cac4d0);
    margin: 8px 0;
}

/* ===== 评论 ===== */
.comment-list { min-width: 320px; max-height: 300px; overflow-y: auto; margin-bottom: 12px; }
.comment-item {
    display: flex; gap: 10px; padding: 10px 0;
    border-bottom: 1px solid #f5f5f5;
    transition: border-color 0.35s ease;
}
.comment-item:last-child { border-bottom: none; }
.comment-item .comment-avatar {
    width: 32px; height: 32px; border-radius: 50%;
    object-fit: cover; background: #e0e0e0;
    flex-shrink: 0; cursor: pointer;
    transition: background 0.35s ease;
}
.comment-item .comment-body { flex: 1; }
.comment-item .comment-author {
    font-weight: 500; font-size: 13px; cursor: pointer; display: inline-block;
}
.comment-item .comment-author:hover { color: var(--md-sys-color-primary); }
.comment-item .comment-text {
    font-size: 14px; line-height: 1.4;
    margin-top: 2px; white-space: pre-wrap;
}
.comment-item .comment-time {
    font-size: 11px; color: var(--md-sys-color-on-surface-variant);
    margin-top: 2px;
}
/* ===== 评论输入框（自定义 textarea） ===== */
.comment-input {
    width: 100%;
    min-height: 56px;
    resize: none;
    font-size: 14px;
    line-height: 1.6;
    padding: 12px 16px;
    border: 2px solid #d0d0d0;
    border-radius: 10px;
    outline: none;
    background: var(--md-sys-color-surface-container-low, #f7f2fa);
    color: var(--md-sys-color-on-surface, #1d1b20);
    transition: background 0.2s, border-color 0.2s, box-shadow 0.2s;
    box-sizing: border-box;
    font-family: inherit;
}
.comment-input:focus {
    background: #fff;
    color: var(--md-sys-color-on-surface, #1d1b20);
    border-color: var(--md-sys-color-primary, #6750a4);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--md-sys-color-primary, #6750a4) 20%, transparent);
}
.comment-empty {
    text-align: center; padding: 20px;
    color: var(--md-sys-color-on-surface-variant);
}

/* ===== 图片查看器 ===== */
.image-viewer-dialog {
    --md-dialog-container-shape: 8px;
}
.image-viewer-img {
    max-width: 80vw; max-height: 70vh;
    border-radius: 8px;
}

/* ===== 个人主页 ===== */
.user-profile-back {
    text-align: left; margin-bottom: 8px;
}
.user-profile-back md-text-button {
    --md-text-button-label-text-color: var(--md-sys-color-primary);
}
.profile-header {
    text-align: center; padding: 24px 0;
}
.profile-avatar {
    width: 80px; height: 80px; border-radius: 50%;
    object-fit: cover; background: #e0e0e0;
    margin-bottom: 12px; cursor: pointer;
}
.profile-nickname {
    font-size: 22px; font-weight: 600; margin-bottom: 2px;
}
.profile-username {
    font-size: 14px; color: var(--md-sys-color-on-surface-variant);
    margin-bottom: 4px;
}
.profile-bio {
    color: var(--md-sys-color-on-surface-variant);
    font-size: 14px; margin-bottom: 8px;
}
.profile-stats {
    display: flex; justify-content: center; gap: 24px;
    margin-top: 12px;
}
.profile-stats .stat {
    text-align: center;
}
.profile-stats .stat-num {
    font-size: 18px; font-weight: 600;
}
.profile-stats .stat-label {
    font-size: 12px; color: var(--md-sys-color-on-surface-variant);
}
.profile-edit-btn {
    margin-top: 16px;
}

/* ===== 发现页 ===== */
.section-title {
    font-size: 18px; font-weight: 600; margin-bottom: 16px;
    padding-top: 8px;
}

/* ===== 音乐广场 ===== */
.music-section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 24px;
    margin-bottom: 16px;
}
.music-section-header .section-title {
    margin-bottom: 0;
    padding-top: 0;
}
.music-header-actions {
    display: flex;
    gap: 6px;
}
.music-card {
    background: var(--md-sys-color-surface-container-low);
    border-radius: 16px;
    padding: 16px;
    box-shadow: var(--md-elevation-level1);
    transition: box-shadow 0.2s ease;
    cursor: pointer;
    margin-bottom: 12px;
}
.music-card:hover {
    box-shadow: var(--md-elevation-level2);
}
.music-card-title {
    font-size: 16px;
    font-weight: 500;
    color: var(--md-sys-color-on-surface);
    margin-bottom: 8px;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.music-card-meta {
    font-size: 13px;
    color: var(--md-sys-color-on-surface-variant);
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}
.music-card-author {
    color: var(--md-sys-color-primary);
    cursor: pointer;
    font-weight: 500;
}
.music-card-author:hover {
    text-decoration: underline;
}
.music-card-plays {
    font-size: 13px;
}
.music-actions {
    display: inline-flex;
    align-items: center;
    gap: 2px;
    margin-left: auto;
}
#music-list {
    transition: opacity 0.25s ease;
}
#music-list.music-loading {
    opacity: 0.4;
}

/* ===== 歌词位置单选按钮 ===== */
.lrc-pos-group {
    display: flex;
    gap: 0;
    border-radius: 28px;
    overflow: hidden;
    border: 1px solid var(--md-sys-color-outline);
    background: transparent;
    margin-top: 4px;
}
.lrc-pos-option {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    padding: 6px 12px;
    font-size: 14px;
    color: var(--md-sys-color-on-surface-variant);
    transition: background 0.2s, color 0.2s;
    user-select: none;
    border-right: 1px solid var(--md-sys-color-outline);
}
.lrc-pos-option:last-child {
    border-right: none;
}
.lrc-pos-radio {
    display: none;
}
.lrc-pos-option:has(.lrc-pos-radio:checked) {
    background: var(--md-sys-color-primary-container);
    color: var(--md-sys-color-on-primary-container);
    font-weight: 500;
}

/* ===== 错误提示 ===== */
.error-toast {
    position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
    background: #333; color: #fff; padding: 12px 24px;
    border-radius: 12px; font-size: 14px;
    box-shadow: var(--md-elevation-level3);
    z-index: 10000; animation: toastIn 0.3s ease;
    max-width: 90vw;
}
@keyframes toastIn {
    from { opacity: 0; transform: translateX(-50%) translateY(20px); }
    to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* ===== 加载骨架 ===== */
.skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e8e8e8 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: 8px;
}
@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ===== 响应式 ===== */
@media (max-width: 720px) {
    .main-content { padding: 12px; padding-top: 72px; }
    .nav-btn { --md-text-button-container-height: 36px; }
    .post-card { border-radius: 12px; padding: 14px 16px; }
}

@media (max-width: 480px) {
    .nav-btn { min-width: auto; }
    .nav-btn span { display: none; }
    .nav-btn md-icon { margin: 0; }
    .auth-btn span { display: none; }
}

/* ===== 发布对话框 - 加宽版 ===== */
#composer-dialog {
    max-width: min(800px, calc(100% - 32px)) !important;
}

#composer-dialog .composer-field {
    min-height: 140px;
    resize: none;
    font-size: 16px;
    line-height: 1.6;
    padding: 16px 20px;
    border: 2px solid #d0d0d0;
    border-radius: 12px;
    outline: none;
    background: var(--md-sys-color-surface-container-low, #f7f2fa);
    transition: background 0.2s, border-color 0.2s, box-shadow 0.2s;
}

#composer-dialog .composer-field:focus {
    background: #fff;
    border-color: var(--md-sys-color-primary, #6750a4);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--md-sys-color-primary, #6750a4) 20%, transparent);
}

/* ===== 聊天的间隙修正 ===== */
.main-content:has(.conv-list),
.main-content:has(.chat-detail) {
    display: flex;
    flex-direction: column;
    padding-top: 8px;
    height: 100vh;
    overflow: hidden;
    box-sizing: border-box;
}
.conv-list-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
}

.conv-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    cursor: pointer;
    border-radius: 16px;
    background: var(--md-sys-color-surface-container-low);
    box-shadow: var(--md-elevation-level1);
    transition: box-shadow 0.2s ease;
    margin-bottom: 8px;
}
.conv-item:hover {
    box-shadow: var(--md-elevation-level2);
}

.conv-avatar-wrap {
    position: relative;
    flex-shrink: 0;
}
.conv-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    object-fit: cover;
    background: var(--md-sys-color-surface-container-high);
}
.conv-avatar-group {
    background: var(--md-sys-color-primary-container);
    display: flex;
    align-items: center;
    justify-content: center;
}
.conv-avatar-group md-icon {
    font-size: 24px;
    color: var(--md-sys-color-on-primary-container);
}

.conv-info {
    flex: 1;
    min-width: 0;
}
.conv-name-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 2px;
}
.conv-name {
    font-weight: 500;
    font-size: 15px;
    color: var(--md-sys-color-on-surface);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.conv-time {
    font-size: 12px;
    color: var(--md-sys-color-on-surface-variant);
    flex-shrink: 0;
    margin-left: 8px;
}
.conv-preview {
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.conv-preview-text {
    font-size: 13px;
    color: var(--md-sys-color-on-surface-variant);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    flex: 1;
}
.conv-unread-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--md-sys-color-error, #b3261e);
    flex-shrink: 0;
    margin-left: 8px;
}

/* 聊天详情页 */
.chat-detail {
    display: flex;
    flex-direction: column;
    flex: 1;
    overflow-y: auto;
}
.chat-detail-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 0;
    flex-shrink: 0;
    position: sticky;
    top: 0;
    z-index: 1;
    background: var(--md-sys-color-surface);
}
.chat-detail-title {
    font-weight: 500;
    font-size: 16px;
}
.chat-detail-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    object-fit: cover;
    cursor: pointer;
    flex-shrink: 0;
}
.chat-detail-avatar:hover {
    opacity: 0.8;
}
.chat-messages {
    flex: 1;
    padding: 12px 0 80px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.chat-msg-row {
    display: flex;
    align-items: flex-end;
    gap: 8px;
    max-width: 85%;
}
.chat-msg-row.self {
    align-self: flex-end;
    flex-direction: row-reverse;
}
.chat-msg-row.other {
    align-self: flex-start;
}
.chat-msg-bubble {
    padding: 10px 14px;
    border-radius: 16px;
    font-size: 14px;
    line-height: 1.45;
    word-break: break-word;
    position: relative;
}
.chat-msg-row.self .chat-msg-bubble {
    background: var(--md-sys-color-primary);
    color: var(--md-sys-color-on-primary);
    border-bottom-right-radius: 4px;
}
.chat-msg-row.other .chat-msg-bubble {
    background: var(--md-sys-color-surface-container-high);
    color: var(--md-sys-color-on-surface);
    border-bottom-left-radius: 4px;
}
.chat-msg-time {
    font-size: 11px;
    opacity: 0.7;
    margin-top: 4px;
}
.chat-msg-row.self .chat-msg-time { text-align: right; }

.chat-input-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    max-width: var(--content-max-width);
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--md-sys-color-surface);
    z-index: 100;
    box-sizing: border-box;
}
.chat-input-bar textarea {
    flex: 1;
    border: none;
    outline: none;
    resize: none;
    padding: 10px 14px;
    border-radius: 24px;
    background: var(--md-sys-color-surface-container-high);
    color: var(--md-sys-color-on-surface);
    font-size: 14px;
    font-family: inherit;
    min-height: 20px;
    max-height: 100px;
    overflow-y: hidden;
    scrollbar-width: none;
    -ms-overflow-style: none;
}
.chat-input-bar textarea::-webkit-scrollbar {
    display: none;
}
.chat-input-bar textarea::placeholder {
    color: var(--md-sys-color-on-surface-variant);
}

/* 聊天图片消息 */
.chat-msg-image {
    max-width: 220px;
    max-height: 220px;
    border-radius: 8px;
    cursor: pointer;
    display: block;
}
.chat-msg-image:hover {
    opacity: 0.9;
}

/* 群聊成员选择 */
.group-member-list {
    max-height: 240px;
    overflow-y: auto;
    margin-top: 8px;
}
.group-member-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 4px;
    cursor: pointer;
    border-radius: 8px;
}
.group-member-item:hover {
    background: var(--md-sys-color-surface-container-high);
}
.group-member-item img {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    object-fit: cover;
}
.group-member-item .member-name {
    font-size: 14px;
    flex: 1;
}
.group-member-item md-checkbox {
    --md-checkbox-container-shape: 4px;
}

/* ===== 群聊消息 - 头像和名称 ===== */
.chat-msg-row.group {
    gap: 8px;
}
.chat-msg-row.group.self {
    align-items: flex-end;
}
.chat-msg-row.group.other {
    align-items: flex-start;
}
.chat-msg-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    object-fit: cover;
    flex-shrink: 0;
    background: var(--md-sys-color-surface-container-high);
}
.chat-msg-name {
    font-size: 12px;
    color: var(--md-sys-color-on-surface-variant);
    margin-bottom: 2px;
    padding-left: 2px;
    line-height: 1.3;
}