/* ===== CSS 变量（浅色主题 · 暖纸） ===== */
:root {
    --z-dropdown: 1000;

    /* 展示字体：宋体衬线（系统内置，零加载成本） */
    --font-display: "Songti SC", "STSong", "Noto Serif SC", "SimSun", serif;

    /* 主色：藏蓝 × 烛金 */
    --color-primary: #3d6a9f;
    --color-primary-hover: #2f5684;
    --color-primary-alpha10: rgba(61, 106, 159, 0.1);
    --color-primary-shadow: rgba(61, 106, 159, 0.28);
    --color-accent: #b58a35;
    --color-accent-soft: rgba(181, 138, 53, 0.12);
    --color-glow: rgba(181, 138, 53, 0.1);

    --color-bg: #f4f1e9;
    --color-card: #fffdf9;
    --color-card-border: #e9e2d2;
    --color-card-shadow: rgba(82, 64, 32, 0.07);
    --color-card-shadow-hover: rgba(82, 64, 32, 0.12);
    --color-list-shadow: rgba(82, 64, 32, 0.05);
    --color-list-shadow-hover: rgba(82, 64, 32, 0.1);
    --color-login-shadow: rgba(82, 64, 32, 0.1);

    --color-text: #35322b;
    --color-text-secondary: #5b574c;
    --color-text-muted: #97907e;
    --color-text-heading: #211f19;
    --color-text-muted-light: #8f8877;
    --color-text-placeholder: #c6bfae;

    --color-border: #ddd5c2;
    --color-border-nav: #e7e0cf;

    --color-btn-secondary-bg: #ece6d6;
    --color-btn-secondary-hover: #e0d8c3;
    --color-danger: #c0442e;
    --color-danger-hover: #a03824;
    --color-success: #3f8f5f;

    --color-input-bg: #fffdf9;
    --color-textarea-bg: #fffdf9;

    --color-code-bg: #f0ebdc;
    --color-code-text: #a63d57;
    --color-blockquote-bg: #f7f3e7;
}

/* ===== 深色主题 =====
   说明：页面加载时的内联脚本会立即给 <html> 加上 dark 或 light class
   （跟随系统偏好或用户手动设置），因此这里只需定义 :root.dark 一套变量。 */
:root.dark {
    --color-primary: #7ba7dc;
    --color-primary-hover: #9dc0e8;
    --color-primary-alpha10: rgba(123, 167, 220, 0.14);
    --color-primary-shadow: rgba(123, 167, 220, 0.2);
    --color-accent: #e3b869;
    --color-accent-soft: rgba(227, 184, 105, 0.13);
    --color-glow: rgba(227, 184, 105, 0.07);

    --color-bg: #131728;
    --color-card: #1d2338;
    --color-card-border: #2c3452;
    --color-card-shadow: rgba(0, 0, 0, 0.3);
    --color-card-shadow-hover: rgba(0, 0, 0, 0.42);
    --color-list-shadow: rgba(0, 0, 0, 0.25);
    --color-list-shadow-hover: rgba(0, 0, 0, 0.38);
    --color-login-shadow: rgba(0, 0, 0, 0.35);

    --color-text: #d8dae6;
    --color-text-secondary: #a6abc2;
    --color-text-muted: #787f9a;
    --color-text-heading: #eef0f8;
    --color-text-muted-light: #8b91ab;
    --color-text-placeholder: #4a5068;

    --color-border: #333b5e;
    --color-border-nav: #2c3452;

    --color-btn-secondary-bg: #2a3252;
    --color-btn-secondary-hover: #354066;
    --color-danger: #e05a48;
    --color-danger-hover: #f0705f;
    --color-success: #4cc38a;

    --color-input-bg: #181e32;
    --color-textarea-bg: #181e32;

    --color-code-bg: #141930;
    --color-code-text: #f0a8c0;
    --color-blockquote-bg: #1a2138;
}

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

body {
    font-family:
        -apple-system, BlinkMacSystemFont, "PingFang SC", "Segoe UI", Roboto,
        "Helvetica Neue", "Microsoft YaHei", sans-serif;
    background-color: var(--color-bg);
    /* 氛围背景：顶部烛光晕染 + 细噪点纹理 */
    background-image:
        radial-gradient(
            ellipse 90% 55% at 50% -12%,
            var(--color-glow),
            transparent 70%
        ),
        url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.04'/%3E%3C/svg%3E");
    background-attachment: fixed;
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    transition:
        background-color 0.3s,
        color 0.3s;
}

/* ===== 展示字体：品牌与页面大标题用宋体衬线 ===== */
.navbar-brand,
.login-card h1,
.posts-header h2,
.new-post-title,
.profile-page h2 {
    font-family: var(--font-display);
}

/* ===== 登录页 ===== */
.login-page {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.login-card {
    position: relative;
    overflow: hidden;
    background: var(--color-card);
    border-radius: 12px;
    box-shadow: 0 2px 12px var(--color-login-shadow);
    padding: 40px;
    width: 100%;
    max-width: 400px;
    border: 1px solid var(--color-card-border);
    animation: rise 0.5s cubic-bezier(0.22, 1, 0.36, 1) backwards;
    transition:
        background-color 0.3s,
        box-shadow 0.3s,
        border-color 0.3s;
}

/* 顶部烛金装饰线 */
.login-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(
        90deg,
        transparent,
        var(--color-accent) 30%,
        var(--color-accent) 70%,
        transparent
    );
    opacity: 0.85;
}

.login-card h1 {
    text-align: center;
    margin-bottom: 8px;
    font-size: 26px;
    font-weight: 700;
    letter-spacing: 0.06em;
    color: var(--color-text-heading);
}

/* 标题下的金色分隔短线 */
.login-card h1::after {
    content: "";
    display: block;
    width: 36px;
    height: 2px;
    margin: 12px auto 0;
    border-radius: 2px;
    background: var(--color-accent);
}

.login-card .btn-primary {
    width: 100%;
}

.login-card p {
    text-align: center;
    color: var(--color-text-muted);
    font-size: 14px;
    margin-bottom: 24px;
}

/* ===== 表单 ===== */
.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-secondary);
}

.form-input {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    font-size: 15px;
    transition: border-color 0.2s;
    outline: none;
    background-color: var(--color-input-bg);
    color: var(--color-text);
}

.form-input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-alpha10);
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition:
        background-color 0.2s,
        box-shadow 0.2s,
        transform 0.15s;
}

.btn:active {
    transform: scale(0.97);
}

.btn-primary {
    background-color: var(--color-primary);
    background-image: linear-gradient(
        180deg,
        var(--color-primary),
        var(--color-primary-hover)
    );
    box-shadow: 0 2px 10px var(--color-primary-shadow);
    color: #fff;
}

.btn-primary:hover {
    background-color: var(--color-primary-hover);
    box-shadow: 0 4px 14px var(--color-primary-shadow);
}

.btn-secondary {
    background-color: var(--color-btn-secondary-bg);
    color: var(--color-text);
}

.btn-secondary:hover {
    background-color: var(--color-btn-secondary-hover);
}

.btn-danger {
    background-color: var(--color-danger);
    color: #fff;
}

.btn-danger:hover {
    background-color: var(--color-danger-hover);
}

.btn-small {
    padding: 6px 14px;
    font-size: 13px;
}

/* ===== 导航栏 ===== */
.navbar {
    background: color-mix(in srgb, var(--color-card) 82%, transparent);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border-nav);
    padding: 12px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition:
        background-color 0.3s,
        border-color 0.3s;
    position: sticky;
    top: 0;
    z-index: 100;
    transform: translateZ(0);
}

.navbar-left {
    display: flex;
    align-items: center;
    gap: 20px;
}

.navbar-right {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
}

.navbar-brand {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: 0.05em;
    color: var(--color-text-heading);
    cursor: pointer;
    transition: color 0.2s;
}

/* 品牌名前的金色星标 */
.navbar-brand::before {
    content: "✦";
    margin-right: 6px;
    font-size: 0.75em;
    color: var(--color-accent);
}

.navbar-brand:hover {
    color: var(--color-primary);
}

.navbar-link {
    font-size: 14px;
    color: var(--color-text-secondary);
    cursor: pointer;
    padding: 4px 0;
    transition: color 0.2s;
}

.navbar-link:hover {
    color: var(--color-primary);
}

/* ===== 导航栏搜索 ===== */
.navbar-search {
    display: flex;
    align-items: center;
}

.search-input {
    padding: 5px 12px;
    border: 1px solid var(--color-border);
    border-radius: 16px;
    font-size: 13px;
    width: 160px;
    outline: none;
    transition:
        border-color 0.2s,
        width 0.2s;
    background-color: var(--color-input-bg);
    color: var(--color-text);
}

.search-input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 2px var(--color-primary-alpha10);
    width: 200px;
}

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

.navbar-right .nickname {
    color: var(--color-primary);
    font-weight: 500;
    cursor: pointer;
    transition: color 0.2s;
}

.navbar-right .nickname:hover {
    color: var(--color-primary-hover);
}

/* ===== 个人中心 ===== */
.profile-page {
    max-width: 600px;
    margin: 0 auto;
    padding: 20px 0;
}

.profile-page h2 {
    font-size: 22px;
    margin-bottom: 24px;
    color: var(--color-text);
}

/* ===== 统计概览 ===== */
.stats-section {
    background: var(--color-card);
    border-radius: 10px;
    padding: 24px;
    border: 1px solid var(--color-border);
    margin-bottom: 20px;
}

.stats-section h3 {
    font-size: 16px;
    margin: 0 0 16px 0;
    color: var(--color-text);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}

.stat-item {
    text-align: center;
    padding: 16px 8px;
    background: var(--color-bg);
    border-radius: 8px;
    border: 1px solid var(--color-card-border);
}

.stat-number {
    display: block;
    font-size: 28px;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1.2;
}

.stat-label {
    display: block;
    font-size: 12px;
    color: var(--color-text-muted);
    margin-top: 4px;
}

.settings-section {
    background: var(--color-card);
    border-radius: 10px;
    padding: 24px;
    border: 1px solid var(--color-border);
}

.settings-section h3 {
    font-size: 16px;
    margin: 0 0 8px 0;
    color: var(--color-text);
}

.logout-section {
    text-align: center;
}

.logout-section .btn-danger {
    width: 200px;
}

.profile-page hr {
    border: none;
    border-top: 1px solid var(--color-card-border);
    margin: 24px 0;
}

.settings-desc {
    font-size: 13px;
    color: var(--color-text-secondary);
    margin: 0 0 16px 0;
}

.settings-subtitle {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-text);
    margin: 0 0 12px 0;
}

.settings-subtitle:not(:first-of-type) {
    margin-top: 20px;
}

.category-checkbox-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
}

.checkbox-item {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: 8px;
    border: 1px solid var(--color-border);
    cursor: pointer;
    font-size: 13px;
    color: var(--color-text);
    background: var(--color-bg);
    transition:
        border-color 0.15s,
        background 0.15s;
    user-select: none;
}

.checkbox-item:hover {
    border-color: var(--color-primary);
}

.checkbox-item.is-checked,
.checkbox-item:has(input:checked) {
    border-color: var(--color-primary);
    background: var(--color-primary-alpha10);
}

.checkbox-item input[type="checkbox"] {
    accent-color: var(--color-primary);
}

/* ===== 随机模式切换 ===== */
.random-mode-options {
    display: flex;
    flex-direction: row;
    gap: 10px;
    margin-bottom: 4px;
}

.radio-item {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 16px;
    border-radius: 8px;
    border: 1px solid var(--color-border);
    cursor: pointer;
    font-size: 13px;
    color: var(--color-text);
    background: var(--color-bg);
    transition:
        border-color 0.15s,
        background 0.15s;
    user-select: none;
    line-height: 1.5;
    flex: 1;
}

.radio-item:hover {
    border-color: var(--color-primary);
    background: var(--color-primary-alpha10);
}

.radio-item input[type="radio"] {
    accent-color: var(--color-primary);
    flex-shrink: 0;
}

.radio-label {
    color: var(--color-text);
    white-space: nowrap;
}

.info-icon {
    position: relative;
    cursor: help;
    font-size: 14px;
    line-height: 1;
    color: var(--color-text-muted);
    flex-shrink: 0;
    transition: color 0.15s;
}

.info-icon:hover {
    color: var(--color-primary);
}

.info-icon::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-text);
    color: var(--color-card);
    font-size: 12px;
    font-weight: 400;
    padding: 6px 10px;
    border-radius: 6px;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.15s;
    z-index: 10;
    max-width: 260px;
    width: max-content;
    white-space: normal;
    line-height: 1.4;
    text-align: center;
}

.info-icon:hover::after {
    opacity: 1;
}

#random-mode-result {
    font-size: 13px;
    margin-top: 4px;
}

#random-mode-result.success {
    color: var(--color-success);
}

#random-mode-result.error {
    color: var(--color-danger);
}

/* ===== 主题切换按钮 ===== */
.theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 18px;
    padding: 4px 8px;
    min-width: 32px;
    min-height: 32px;
    border-radius: 6px;
}

.theme-toggle:hover {
    background-color: var(--color-btn-secondary-bg);
}

/* ===== 内容区 ===== */
.container {
    max-width: 720px;
    margin: 0 auto;
    padding: 24px 20px;
}

/* ===== 无帖子提示 ===== */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--color-text-muted);
}

.empty-state p {
    margin-bottom: 20px;
    font-size: 16px;
}

/* ===== 帖子卡片 ===== */
.post-card {
    background: var(--color-card);
    border-radius: 12px;
    box-shadow: 0 2px 12px var(--color-card-shadow);
    padding: 28px 28px 20px;
    margin-bottom: 20px;
    border: 1px solid var(--color-card-border);
    animation: rise 0.45s cubic-bezier(0.22, 1, 0.36, 1) backwards;
    transition:
        background-color 0.3s,
        border-color 0.3s,
        box-shadow 0.3s;
}

.post-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 12px;
    font-size: 13px;
    color: var(--color-text-muted);
}

.post-meta .left {
    display: flex;
    align-items: center;
    gap: 8px;
}

.post-meta .right {
    margin-left: auto;
}

.post-meta .author {
    font-weight: 500;
    color: var(--color-primary);
}

.post-meta .time {
    color: var(--color-text-muted);
}

.shuffle-link {
    font-size: 13px;
    color: var(--color-primary);
    cursor: pointer;
    user-select: none;
}

.shuffle-link:hover {
    color: var(--color-primary-hover);
}

.edit-link {
    font-size: 12px;
    color: var(--color-primary);
    cursor: pointer;
    margin-left: 8px;
    user-select: none;
}

.edit-link:hover {
    color: var(--color-primary-hover);
}

.delete-link {
    font-size: 12px;
    color: var(--color-danger);
    cursor: pointer;
    margin-left: 8px;
    user-select: none;
}

.delete-link:hover {
    color: var(--color-danger-hover);
}

.post-edit-area {
    margin-top: 12px;
}

.post-edit-area textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    font-size: 15px;
    resize: vertical;
    min-height: 200px;
    font-family: inherit;
    outline: none;
    background-color: var(--color-textarea-bg);
    color: var(--color-text);
}

.post-edit-area textarea:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-alpha10);
}

.reply-item .post-edit-area textarea {
    min-height: 80px;
}

.edit-meta-actions {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-left: 4px;
    vertical-align: middle;
}
.edit-meta-actions .btn {
    background: none;
    color: var(--color-primary);
    border: none;
    padding: 0 4px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: normal;
    cursor: pointer;
    transition: color 0.15s;
}
.edit-meta-actions .btn:hover {
    color: var(--color-primary-hover);
}
.edit-meta-actions .btn:disabled {
    opacity: 0.4;
    cursor: default;
}
.edit-meta-actions .reply-edit-cancel {
    font-size: 12px;
}

.post-edit-area .edit-footer {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 10px;
}

.post-edit-area .edit-footer .form-input {
    flex: 1;
    min-width: 0;
    padding: 8px 10px;
    font-size: 14px;
}

.cancel-text {
    font-size: 13px;
    color: var(--color-text-muted);
    cursor: pointer;
}

.cancel-text:hover {
    color: var(--color-danger);
}

.post-content {
    font-size: 16px;
    line-height: 1.8;
    word-break: break-word;
    color: var(--color-text);
}

.post-content p {
    margin-bottom: 8px;
}

.post-content p:last-child {
    margin-bottom: 0;
}

/* ===== 回复区域 ===== */
.replies-section {
    margin-top: 20px;
    padding-top: 4px;
}

.replies-section h3 {
    font-size: 13px;
    color: var(--color-text-muted-light);
    margin-bottom: 12px;
    font-weight: 500;
    letter-spacing: 0.02em;
}

.reply-item {
    background: var(--color-card);
    border-radius: 10px;
    box-shadow: 0 1px 6px var(--color-card-shadow);
    border: 1px solid var(--color-card-border);
    padding: 16px 20px;
    margin-bottom: 10px;
    animation: rise 0.4s cubic-bezier(0.22, 1, 0.36, 1) backwards;
    transition:
        box-shadow 0.2s,
        transform 0.2s,
        background-color 0.3s,
        border-color 0.3s;
}

.reply-item:hover {
    box-shadow: 0 2px 10px var(--color-card-shadow-hover);
    transform: translateY(-1px);
}

.reply-item:last-child {
    margin-bottom: 0;
}

.reply-meta {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    color: var(--color-text-muted);
    margin-bottom: 6px;
}

.reply-meta .left {
    display: flex;
    align-items: center;
    gap: 6px;
}

.reply-meta .right {
    margin-left: auto;
}

.reply-meta .author {
    font-weight: 500;
    color: var(--color-primary);
}

.reply-meta .time {
    color: var(--color-text-muted);
}

.reply-actions {
    position: relative;
    margin-left: auto;
    display: flex;
    align-items: center;
}

.post-actions {
    position: relative;
    display: flex;
    align-items: center;
}

.kebab-btn {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 18px;
    line-height: 1;
    color: var(--color-text-muted);
    padding: 2px 4px;
    border-radius: 4px;
    transition:
        color 0.15s,
        background-color 0.15s;
    letter-spacing: 2px;
}

.kebab-btn:hover {
    color: var(--color-text);
    background-color: var(--color-btn-secondary-bg);
}

.kebab-menu {
    position: absolute;
    right: 0;
    top: calc(100% + 4px);
    min-width: 100px;
    background: var(--color-card);
    border: 1px solid var(--color-card-border);
    border-radius: 8px;
    box-shadow: 0 4px 16px var(--color-card-shadow-hover);
    z-index: var(--z-dropdown);
    overflow: hidden;
    display: none;
}

.kebab-menu.open {
    display: block;
    animation: pop-in 0.16s cubic-bezier(0.22, 1, 0.36, 1);
    transform-origin: top right;
}

.kebab-menu-item {
    padding: 10px 16px;
    font-size: 13px;
    cursor: pointer;
    white-space: nowrap;
    transition: background-color 0.15s;
    user-select: none;
}

.kebab-menu-item:hover {
    background-color: var(--color-btn-secondary-bg);
}

.kebab-menu-item[data-action="delete"] {
    color: var(--color-danger);
}

.kebab-menu-item[data-action="delete"]:hover {
    color: var(--color-danger-hover);
    background-color: rgba(231, 76, 60, 0.08);
}

.reply-content {
    font-size: 15px;
    line-height: 1.6;
    word-break: break-word;
    color: var(--color-text);
}

.reply-content p {
    margin-bottom: 6px;
}

.reply-content p:last-child {
    margin-bottom: 0;
}

/* ===== 回复表单 ===== */
.reply-form {
    margin-top: 16px;
}

.reply-form textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    font-size: 14px;
    resize: vertical;
    min-height: 80px;
    font-family: inherit;
    outline: none;
    transition: border-color 0.2s;
    background-color: var(--color-textarea-bg);
    color: var(--color-text);
}

.reply-form textarea:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-alpha10);
}

.reply-form .btn-wrap {
    display: flex;
    justify-content: flex-end;
    margin-top: 8px;
}

/* ===== 帖子列表页 ===== */
.posts-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.posts-header h2 {
    font-size: 22px;
    font-weight: 700;
    letter-spacing: 0.03em;
    color: var(--color-text-heading);
}

/* 标题后的金色渐隐短线 */
.posts-header h2::after {
    content: "";
    display: inline-block;
    width: 28px;
    height: 3px;
    margin-left: 10px;
    vertical-align: middle;
    border-radius: 2px;
    background: linear-gradient(90deg, var(--color-accent), transparent);
}

.post-list-item {
    background: var(--color-card);
    border-radius: 10px;
    padding: 16px 20px;
    margin-bottom: 10px;
    box-shadow: 0 1px 4px var(--color-list-shadow);
    border: 1px solid var(--color-card-border);
    cursor: pointer;
    animation: rise 0.4s cubic-bezier(0.22, 1, 0.36, 1) backwards;
    transition:
        box-shadow 0.2s,
        transform 0.2s,
        border-color 0.2s,
        background-color 0.3s;
}

.post-list-item:hover {
    box-shadow: 0 3px 12px var(--color-list-shadow-hover);
    border-color: var(--color-accent);
    transform: translateY(-2px);
}

/* 列表错峰入场 */
.post-list-item:nth-child(2),
.reply-item:nth-child(2) {
    animation-delay: 0.05s;
}
.post-list-item:nth-child(3),
.reply-item:nth-child(3) {
    animation-delay: 0.1s;
}
.post-list-item:nth-child(4),
.reply-item:nth-child(4) {
    animation-delay: 0.15s;
}
.post-list-item:nth-child(5),
.reply-item:nth-child(5) {
    animation-delay: 0.2s;
}
.post-list-item:nth-child(n + 6),
.reply-item:nth-child(n + 6) {
    animation-delay: 0.25s;
}

.post-list-item .preview {
    font-size: 15px;
    line-height: 1.5;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 6px;
    color: var(--color-text);
}

.post-list-item .meta {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: var(--color-text-muted);
}

/* ===== ID 徽章（帖子/回复） ===== */
.id-badge {
    font-size: 11px;
    font-weight: 600;
    font-family: ui-monospace, "SF Mono", Menlo, monospace;
    color: var(--color-text-muted-light);
    background: var(--color-primary-alpha10);
    padding: 1px 7px;
    border-radius: 8px;
    letter-spacing: 0.02em;
    user-select: text;
}

/* ===== 分类标签（烛金徽章） ===== */
.category-badge {
    display: inline-block;
    font-size: 11px;
    font-weight: 500;
    color: var(--color-accent);
    background: var(--color-accent-soft);
    padding: 1px 8px;
    border-radius: 10px;
    letter-spacing: 0.02em;
    line-height: 1.6;
    vertical-align: middle;
}

.post-meta .category-badge {
    background: var(--color-accent-soft);
    color: var(--color-accent);
    padding: 2px 8px;
}

/* ===== 分类筛选 ===== */
.category-filter {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
}

.filter-label {
    font-size: 13px;
    color: var(--color-text-secondary);
    white-space: nowrap;
    flex-shrink: 0;
}

.filter-select {
    padding: 6px 28px 6px 10px;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    font-size: 13px;
    color: var(--color-text);
    background-color: var(--color-input-bg);
    cursor: pointer;
    outline: none;
    appearance: auto;
    -webkit-appearance: auto;
    min-width: 120px;
    max-width: 260px;
    transition: border-color 0.2s;
}

.filter-select:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-alpha10);
}

.filter-select option {
    color: var(--color-text);
    background-color: var(--color-input-bg);
}

.filter-btn {
    display: inline-block;
    font-size: 12px;
    padding: 4px 12px;
    border-radius: 14px;
    background: var(--color-btn-secondary-bg);
    color: var(--color-text-secondary);
    cursor: pointer;
    user-select: none;
    transition:
        background-color 0.2s,
        color 0.2s;
    border: 1px solid transparent;
}

.filter-btn:hover {
    background: var(--color-btn-secondary-hover);
    color: var(--color-primary);
}

.filter-btn.active {
    background: var(--color-primary);
    color: #fff;
}

/* ===== 分页控件 ===== */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
    margin-top: 24px;
    padding: 12px 0;
}

.page-btn {
    display: inline-block;
    padding: 6px 16px;
    border-radius: 6px;
    font-size: 13px;
    cursor: pointer;
    background: var(--color-btn-secondary-bg);
    color: var(--color-text-secondary);
    user-select: none;
    transition:
        background-color 0.2s,
        color 0.2s;
}

.page-btn:hover {
    background: var(--color-primary);
    color: #fff;
}

.page-btn.active {
    background: var(--color-primary);
    color: #fff;
    cursor: default;
    font-weight: 600;
}

.page-btn.disabled {
    opacity: 0.3;
    cursor: default;
    pointer-events: none;
}

.page-ellipsis {
    font-size: 13px;
    color: var(--color-text-muted);
    padding: 0 4px;
    user-select: none;
}

.page-info {
    font-size: 13px;
    color: var(--color-text-muted);
}

/* ===== 发帖页 ===== */
.new-post-page textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    font-size: 15px;
    resize: vertical;
    min-height: 150px;
    font-family: inherit;
    outline: none;
    transition: border-color 0.2s;
    background-color: var(--color-textarea-bg);
    color: var(--color-text);
    margin-bottom: 16px;
}

.new-post-page textarea:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-alpha10);
}

.new-post-footer {
    display: flex;
    align-items: center;
    gap: 12px;
}

.new-post-footer .category-input {
    flex: 1;
    min-width: 0;
}

.new-post-footer .form-actions {
    display: flex;
    gap: 10px;
    flex-shrink: 0;
}

/* ===== 工具类 ===== */
.hidden {
    display: none !important;
}

.error-msg {
    color: var(--color-danger);
    font-size: 13px;
    margin-top: 8px;
}

.success-msg {
    color: var(--color-success);
    font-size: 13px;
    margin-top: 8px;
}

/* ===== 页面头部 ===== */
.page-header {
    margin-bottom: 16px;
}

/* ===== 操作栏 ===== */
.action-bar {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

/* ===== 内联样式替代类 ===== */
.loading-text {
    color: var(--color-text-muted);
    text-align: center;
    padding: 40px 0;
}

.error-text {
    color: var(--color-danger);
    text-align: center;
    padding: 40px 0;
}

.empty-reply-hint {
    color: var(--color-text-placeholder);
    font-size: 14px;
}

.new-post-card {
    padding: 32px;
}

.new-post-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--color-text-heading);
    margin: 0 0 20px 0;
    line-height: 1.3;
}

/* ===== Markdown 内容样式 ===== */
.post-content h1,
.post-content h2,
.post-content h3,
.post-content h4,
.post-content h5,
.post-content h6,
.reply-content h1,
.reply-content h2,
.reply-content h3,
.reply-content h4,
.reply-content h5,
.reply-content h6 {
    margin-top: 16px;
    margin-bottom: 8px;
    font-weight: 600;
    line-height: 1.4;
    color: var(--color-text-heading);
}

.post-content h1:first-child,
.post-content h2:first-child,
.post-content h3:first-child,
.reply-content h1:first-child,
.reply-content h2:first-child,
.reply-content h3:first-child {
    margin-top: 0;
}

.post-content h1,
.reply-content h1 {
    font-size: 1.5em;
}
.post-content h2,
.reply-content h2 {
    font-size: 1.3em;
}
.post-content h3,
.reply-content h3 {
    font-size: 1.15em;
}
.post-content h4,
.reply-content h4 {
    font-size: 1.05em;
}
.post-content h5,
.reply-content h5 {
    font-size: 1em;
}
.post-content h6,
.reply-content h6 {
    font-size: 0.9em;
    color: var(--color-text-muted);
}

.post-content a,
.reply-content a {
    color: var(--color-primary);
    text-decoration: none;
}

.post-content a:hover,
.reply-content a:hover {
    text-decoration: underline;
}

.post-content code,
.reply-content code {
    background: var(--color-code-bg);
    color: var(--color-code-text);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9em;
    font-family:
        "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

.post-content pre,
.reply-content pre {
    background: var(--color-code-bg);
    border-radius: 6px;
    padding: 12px 16px;
    overflow-x: auto;
    margin: 10px 0;
    line-height: 1.5;
}

.post-content pre code,
.reply-content pre code {
    background: none;
    padding: 0;
    border-radius: 0;
    font-size: 0.88em;
}

.post-content blockquote,
.reply-content blockquote {
    margin: 10px 0;
    padding: 4px 16px;
    border-left: 4px solid var(--color-accent);
    color: var(--color-text-muted);
    background: var(--color-blockquote-bg);
    border-radius: 0 6px 6px 0;
}

.post-content blockquote p:last-child,
.reply-content blockquote p:last-child {
    margin-bottom: 0;
}

.post-content ul,
.post-content ol,
.reply-content ul,
.reply-content ol {
    margin: 8px 0;
    padding-left: 24px;
}

.post-content li,
.reply-content li {
    margin-bottom: 4px;
}

.post-content li:last-child,
.reply-content li:last-child {
    margin-bottom: 0;
}

.post-content table,
.reply-content table {
    border-collapse: collapse;
    margin: 10px 0;
    width: 100%;
    font-size: 0.95em;
}

.post-content th,
.post-content td,
.reply-content th,
.reply-content td {
    border: 1px solid var(--color-card-border);
    padding: 6px 12px;
    text-align: left;
}

.post-content th,
.reply-content th {
    background: var(--color-code-bg);
    font-weight: 600;
}

.post-content hr,
.reply-content hr {
    border: none;
    border-top: 1px solid var(--color-card-border);
    margin: 16px 0;
}

.post-content img,
.reply-content img {
    max-width: 100%;
    border-radius: 6px;
    margin: 8px 0;
}

/* ===== 表单错误反馈 ===== */
.input-error {
    border-color: var(--color-danger) !important;
    box-shadow: 0 0 0 3px
        color-mix(in srgb, var(--color-danger) 16%, transparent) !important;
    animation: shake 0.35s cubic-bezier(0.36, 0.07, 0.19, 0.97);
}

@keyframes shake {
    10%,
    90% {
        transform: translateX(-1px);
    }
    20%,
    80% {
        transform: translateX(2px);
    }
    30%,
    50%,
    70% {
        transform: translateX(-3px);
    }
    40%,
    60% {
        transform: translateX(3px);
    }
}

.error-msg:not(.hidden) {
    animation: rise 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}

/* ===== Toast 通知 ===== */
#toast-host {
    position: fixed;
    bottom: 24px;
    right: 24px;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 10px;
    z-index: 2000;
    pointer-events: none;
}

.toast {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 18px;
    border-radius: 10px;
    background: var(--color-card);
    border: 1px solid var(--color-card-border);
    border-left: 3px solid var(--color-accent);
    box-shadow: 0 6px 20px var(--color-card-shadow-hover);
    font-size: 14px;
    color: var(--color-text);
    max-width: min(360px, calc(100vw - 48px));
    animation: toast-in 0.28s cubic-bezier(0.22, 1, 0.36, 1);
    transition:
        background-color 0.3s,
        border-color 0.3s;
}

.toast-success {
    border-left-color: var(--color-success);
}

.toast-error {
    border-left-color: var(--color-danger);
}

.toast-icon {
    font-weight: 700;
    flex-shrink: 0;
    line-height: 1;
}

.toast-info .toast-icon {
    color: var(--color-accent);
}

.toast-success .toast-icon {
    color: var(--color-success);
}

.toast-error .toast-icon {
    color: var(--color-danger);
}

.toast-msg {
    word-break: break-all;
    line-height: 1.45;
}

.toast-out {
    animation: toast-out 0.25s ease forwards;
}

@keyframes toast-in {
    from {
        opacity: 0;
        transform: translateY(12px) scale(0.96);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@keyframes toast-out {
    to {
        opacity: 0;
        transform: translateY(8px) scale(0.97);
    }
}

/* ===== 骨架屏 ===== */
.skeleton-line {
    display: block;
    position: relative;
    overflow: hidden;
    border-radius: 6px;
    background-color: var(--color-btn-secondary-bg);
}

.skeleton-line::after {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent 0%,
        var(--color-card-border) 50%,
        transparent 100%
    );
    transform: translateX(-100%);
    animation: shimmer 1.4s ease-in-out infinite;
    will-change: transform;
}

.skeleton-card,
.skeleton-row {
    pointer-events: none;
    animation: none;
}

.skeleton-item {
    pointer-events: none;
}

.sk-meta {
    height: 12px;
    width: 45%;
    margin-bottom: 16px;
}

.sk-title {
    height: 20px;
    width: 82%;
    margin-bottom: 18px;
}

.sk-text {
    height: 14px;
    width: 100%;
    margin-bottom: 10px;
}

.sk-short {
    width: 58%;
}

.sk-preview {
    height: 15px;
    width: 88%;
    margin-bottom: 8px;
}

.sk-rowmeta {
    height: 11px;
    width: 46%;
}

.sk-number {
    height: 26px;
    width: 56px;
    margin: 0 auto 8px;
}

.sk-label {
    height: 12px;
    width: 44px;
    margin: 0 auto;
}

.sk-chip {
    height: 13px;
    width: 52px;
}

@keyframes shimmer {
    0% {
        transform: translateX(-100%);
    }
    100% {
        transform: translateX(100%);
    }
}

/* ===== 空状态装饰 ===== */
.empty-state-icon {
    font-size: 36px;
    color: var(--color-accent);
    opacity: 0.65;
    margin-bottom: 10px;
    animation: rise 0.5s cubic-bezier(0.22, 1, 0.36, 1) backwards;
}

.empty-reply-hint::before {
    content: "✦ ";
    color: var(--color-accent);
    opacity: 0.6;
}

/* ===== 响应式：平板与窄屏（≤900px） ===== */
@media (max-width: 900px) {
    .navbar {
        padding: 12px 16px;
    }

    .navbar-left {
        gap: 14px;
    }

    .search-input {
        width: 130px;
    }

    .search-input:focus {
        width: 160px;
    }

    .container {
        padding: 20px 16px;
    }
}

/* ===== 响应式：移动端（≤768px） ===== */
@media (max-width: 768px) {
    /* 导航栏折行：第一行 品牌+链接+右侧，搜索框独占第二行通栏 */
    .navbar {
        flex-wrap: wrap;
        padding: 10px 14px;
        gap: 8px 12px;
    }

    .navbar-left {
        flex-wrap: wrap;
        gap: 6px 14px;
        min-width: 0;
    }

    .navbar-search {
        flex-basis: 100%;
        order: 10;
    }

    .search-input {
        width: 100%;
    }

    .search-input:focus {
        width: 100%;
    }

    .navbar-right {
        margin-left: auto;
        gap: 8px;
    }

    /* 内容区与卡片收窄 */
    .container {
        padding: 16px 12px;
    }

    .post-card {
        padding: 20px 18px 16px;
        margin-bottom: 16px;
        border-radius: 10px;
    }

    .new-post-card {
        padding: 24px 20px;
    }

    .post-meta {
        flex-wrap: wrap;
        row-gap: 6px;
    }

    .reply-item {
        padding: 14px 16px;
    }

    /* 登录卡片 */
    .login-card {
        padding: 32px 24px;
        max-width: 380px;
    }

    /* 个人中心 */
    .stats-section,
    .settings-section {
        padding: 18px;
    }

    .stat-number {
        font-size: 24px;
    }

    /* 分页与筛选 */
    .pagination {
        flex-wrap: wrap;
        gap: 8px;
    }

    .category-filter {
        flex-wrap: wrap;
    }

    .filter-select {
        flex: 1;
        min-width: 140px;
    }

    .empty-state {
        padding: 40px 16px;
    }

    /* Toast 靠底部通栏 */
    #toast-host {
        bottom: 16px;
        left: 12px;
        right: 12px;
        align-items: stretch;
    }

    .toast {
        max-width: none;
    }
}

/* ===== 响应式：小屏手机（≤480px） ===== */
@media (max-width: 480px) {
    .navbar {
        padding: 8px 12px;
    }

    .navbar-brand {
        font-size: 18px;
    }

    .navbar-link {
        font-size: 13px;
    }

    .navbar-right .nickname {
        max-width: 96px;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
        display: inline-block;
        vertical-align: bottom;
    }

    .container {
        padding: 14px 10px;
    }

    .post-card {
        padding: 16px 14px 14px;
    }

    .new-post-card {
        padding: 20px 16px;
    }

    .posts-header h2 {
        font-size: 19px;
    }

    .post-list-item {
        padding: 12px 14px;
    }

    .post-list-item .preview {
        font-size: 14px;
    }

    /* 发帖页底部操作区改纵向 */
    .new-post-footer {
        flex-direction: column;
        align-items: stretch;
        gap: 10px;
    }

    .new-post-footer .form-actions {
        width: 100%;
    }

    .new-post-footer .form-actions .btn {
        flex: 1;
    }

    /* 随机模式选项纵向排列 */
    .random-mode-options {
        flex-direction: column;
    }

    /* 个人中心 */
    .profile-page h2 {
        font-size: 19px;
    }

    .stats-grid {
        gap: 8px;
    }

    .stat-item {
        padding: 12px 4px;
    }

    .stat-number {
        font-size: 20px;
    }

    .logout-section .btn-danger {
        width: 100%;
        max-width: 280px;
    }

    /* 登录卡片 */
    .login-card {
        padding: 28px 18px;
    }

    .login-card h1 {
        font-size: 24px;
    }

    /* 表单与按钮触控友好化 */
    .page-btn {
        padding: 8px 14px;
    }

    .edit-meta-actions {
        flex-wrap: wrap;
    }
}

/* ===== 动效关键帧 ===== */
@keyframes rise {
    from {
        opacity: 0;
        transform: translateY(14px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pop-in {
    from {
        opacity: 0;
        transform: translateY(-4px) scale(0.97);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* ===== 键盘焦点环（可访问性） ===== */
:where(
    button,
    a,
    input,
    select,
    textarea,
    [tabindex]
):focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* ===== 滚动条 ===== */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 6px;
    border: 2px solid var(--color-bg);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-muted);
}

/* ===== 减弱动效偏好 ===== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}