/* ============================================================
   aipaoxue 导航主题 for Typecho
   卡片式 AI 工具导航 / SEO 友好 / 响应式
   ============================================================ */

:root {
    --primary: #0066ff;
    --primary-dark: #0052cc;
    --primary-light: rgba(0, 102, 255, .08);
    --text: #1d2129;
    --text-2: #4e5969;
    --text-3: #86909c;
    --bg: #f7f9fa;
    --card: #ffffff;
    --border: #eef0f3;
    --radius: 12px;
    --radius-s: 8px;
    --shadow: 0 2px 8px rgba(29, 33, 41, .04);
    --shadow-hover: 0 12px 32px rgba(0, 102, 255, .12);
    --header-h: 64px;
}

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

html {
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    font-size: 15px;
    line-height: 1.6;
    color: var(--text);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--text);
    text-decoration: none;
    transition: color .2s;
}
a:hover {
    color: var(--primary);
}
img {
    max-width: 100%;
    height: auto;
    vertical-align: middle;
}
ul,
ol {
    list-style: none;
}
button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}
input,
textarea {
    font-family: inherit;
    font-size: 14px;
    outline: none;
}

.wrapper {
    width: 1200px;
    max-width: calc(100% - 32px);
    margin: 0 auto;
}

/* ============ 头部 & 导航栏 ============ */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--header-h);
    background: rgba(255, 255, 255, .92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}
.header-inner {
    display: flex;
    align-items: center;
    height: var(--header-h);
    gap: 24px;
}

.logo {
    display: flex;
    align-items: center;
    flex-shrink: 1;
    min-width: 0;
    font-size: 24px;
    font-weight: 800;
    letter-spacing: -.5px;
}
.logo img {
    display: block;
    height: 36px;
    width: auto;
}
.logo-ai {
    color: var(--primary);
    margin-right: 2px;
    flex-shrink: 0;
}
.logo-hub {
    color: var(--text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 300px;
    font-size: 19px;
}

/* ---- 导航栏 ---- */
.main-nav {
    flex: 1;
    min-width: 0;
    overflow: visible;
}
.main-nav>ul {
    display: flex;
    gap: 6px;
    flex-wrap: nowrap;
    overflow-x: auto;
    scrollbar-width: none;
    position: relative;
}
.main-nav>ul::-webkit-scrollbar {
    display: none;
}

.main-nav>ul>li {
    position: relative;
    flex-shrink: 0;
}

.main-nav a {
    display: block;
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-2);
    white-space: nowrap;
    transition: all 0.2s ease;
}
.main-nav a:hover {
    color: var(--primary);
    background: var(--primary-light);
}
.main-nav .current a {
    color: var(--primary);
    font-weight: 600;
    background: var(--primary-light);
}

/* ★ 下拉菜单容器 ★ */
.main-nav .dropdown {
    display: none;
    position: absolute;
    top: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%);
    min-width: 180px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 12px;
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.10);
    padding: 8px 0;
    z-index: 200;
}
.main-nav .dropdown li {
    display: block;
}
.main-nav .dropdown a {
    padding: 8px 20px;
    font-size: 14px;
    font-weight: 400;
    color: var(--text-2);
    border-radius: 0;
    white-space: nowrap;
    background: transparent;
}
.main-nav .dropdown a:hover {
    background: var(--primary-light);
    color: var(--primary);
}
.main-nav .dropdown .current a {
    color: var(--primary);
    font-weight: 600;
    background: var(--primary-light);
}

/* ★ PC端：悬停展开（增加 !important 确保生效） ★ */
@media (min-width: 641px) {
    .main-nav li.has-dropdown:hover>a::after {
        transform: rotate(180deg);
    }
}

/* ★ 下拉菜单小三角指示器 ★ */
.main-nav li.has-dropdown>a::after {
    content: "▾";
    font-size: 10px;
    margin-left: 4px;
    opacity: .6;
    display: inline-block;
    transition: transform .25s;
}

/* ★ 下拉菜单的切换按钮（PC端隐藏） ★ */
.main-nav .dropdown-toggle {
    display: none;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}
.header-user .user-avatar {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--bg);
    border: 1px solid var(--border);
    overflow: hidden;
    transition: border-color .2s;
}
.header-user .user-avatar:hover {
    border-color: var(--primary);
}
.header-user .user-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.header-search {
    display: flex;
    align-items: center;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 2px 4px 2px 14px;
    transition: border-color .2s, box-shadow .2s;
}
.header-search:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
    background: #fff;
}
.header-search input {
    border: none;
    background: none;
    width: 140px;
    height: 30px;
    color: var(--text);
}
.header-search button {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    transition: background .2s;
}
.header-search button:hover {
    background: var(--primary-dark);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
}
.nav-toggle span {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: transform .25s, opacity .25s;
}
.nav-toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}
.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}
.nav-toggle.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ============ Hero ============ */
.hero {
    position: relative;
    overflow: hidden;
    padding: 72px 0 56px;
    background: #fff;
    border-bottom: 1px solid var(--border);
}
.hero-bg {
    position: absolute;
    inset: 0;
    pointer-events: none;
}
.blob {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: .5;
}
.blob.b1 {
    width: 420px;
    height: 420px;
    background: #dbeafe;
    top: -160px;
    left: -80px;
}
.blob.b2 {
    width: 380px;
    height: 380px;
    background: #ede9fe;
    top: -100px;
    right: 5%;
}
.blob.b3 {
    width: 300px;
    height: 300px;
    background: #cffafe;
    bottom: -160px;
    left: 40%;
}

.hero-inner {
    position: relative;
    text-align: center;
}
.hero-title {
    font-size: 44px;
    font-weight: 800;
    letter-spacing: -1px;
    line-height: 1.25;
    background: linear-gradient(120deg, #0066ff 10%, #7c3aed 55%, #00b8d9 90%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin-bottom: 16px;
}
.hero-desc {
    font-size: 17px;
    color: var(--text-2);
    margin-bottom: 32px;
}

.hero-search {
    display: flex;
    align-items: center;
    gap: 8px;
    max-width: 560px;
    margin: 0 auto 24px;
    background: #fff;
    border: 1.5px solid var(--border);
    border-radius: 999px;
    padding: 6px 6px 6px 20px;
    color: var(--text-3);
    box-shadow: var(--shadow);
    transition: border-color .2s, box-shadow .2s;
}
.hero-search:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px var(--primary-light);
}
.hero-search input {
    flex: 1;
    border: none;
    background: none;
    height: 38px;
    font-size: 15px;
    color: var(--text);
    min-width: 0;
}
.hero-search button {
    flex-shrink: 0;
    background: linear-gradient(135deg, var(--primary), #3385ff);
    color: #fff;
    font-size: 15px;
    font-weight: 600;
    height: 38px;
    padding: 0 28px;
    border-radius: 999px;
    transition: transform .2s, box-shadow .2s;
}
.hero-search button:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(0, 102, 255, .35);
}

.hero-tags {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
}
.hero-tags a {
    font-size: 13px;
    color: var(--text-2);
    background: var(--bg);
    border: 1px solid var(--border);
    padding: 5px 14px;
    border-radius: 999px;
    transition: all .2s;
}
.hero-tags a:hover {
    color: var(--primary);
    border-color: var(--primary);
    background: var(--primary-light);
}

/* ============ 分类区块 ============ */
.cat-section {
    padding: 40px 0 8px;
}

.cat-head {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    margin-bottom: 20px;
    gap: 16px;
}
.cat-title {
    display: flex;
    align-items: center;
    font-size: 22px;
    font-weight: 700;
}
.cat-dot {
    width: 6px;
    height: 22px;
    border-radius: 3px;
    margin-right: 10px;
    background: linear-gradient(180deg, var(--primary), #00b8d9);
}
.cat-count {
    font-style: normal;
    font-size: 12px;
    font-weight: 600;
    color: var(--primary);
    background: var(--primary-light);
    border-radius: 999px;
    padding: 2px 10px;
    margin-left: 10px;
}
.cat-desc {
    font-size: 13px;
    color: var(--text-3);
    margin-top: 6px;
}
.cat-more {
    display: flex;
    align-items: center;
    gap: 2px;
    font-size: 14px;
    color: var(--text-3);
    white-space: nowrap;
}
.cat-more:hover {
    color: var(--primary);
}

/* ============ AI工具 4栏大图卡片 ============ */
.tool-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}
.tool-card {
    position: relative;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: transform .25s, box-shadow .25s, border-color .25s;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}
.tool-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: rgba(0, 102, 255, .35);
}

.tool-thumb {
    width: 100%;
    height: 160px;
    background: #f5f6fa;
    border-bottom: 1px solid var(--border);
    overflow: hidden;
    flex-shrink: 0;
}
.tool-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform .3s ease;
}
.tool-card:hover .tool-thumb img {
    transform: scale(1.05);
}
.tool-icon-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg);
    color: #ccc;
    font-size: 40px;
    font-weight: bold;
}

.tool-body {
    padding: 18px;
    flex: 1;
    display: flex;
    flex-direction: column;
}
.tool-meta {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 8px;
    margin-bottom: 8px;
}
.tool-name {
    font-size: 15.5px;
    font-weight: 600;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    word-break: break-all;
    overflow-wrap: anywhere;
    flex: 1;
}
.tool-date {
    font-size: 12px;
    color: var(--text-3);
    white-space: nowrap;
    flex-shrink: 0;
    margin-top: 2px;
}

.tool-badge {
    position: absolute;
    top: 12px;
    right: 12px;
    font-size: 11px;
    font-weight: 600;
    color: var(--primary);
    background: rgba(255, 255, 255, .9);
    border: 1px solid var(--primary-light);
    border-radius: 4px;
    padding: 2px 8px;
}
.tool-desc {
    font-size: 13px;
    color: var(--text-2);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    word-break: break-all;
    overflow-wrap: anywhere;
    flex: 1;
    margin-bottom: 14px;
    min-height: 2.6em;
}
.tool-foot {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    border-top: 1px dashed var(--border);
    padding-top: 12px;
}
.tool-catname {
    font-size: 12px;
    color: var(--text-3);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    min-width: 0;
}
.tool-go {
    display: inline-flex;
    align-items: center;
    gap: 3px;
    font-size: 13px;
    font-weight: 600;
    color: var(--primary);
    transition: gap .2s;
    flex-shrink: 0;
}
.tool-go:hover {
    gap: 6px;
    color: var(--primary-dark);
}

/* ============ AI教程/资讯卡片加粗双栏 ============ */
.post-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}
.post-card {
    display: flex;
    flex-direction: column;
    background: var(--card);
    border: 2px solid #eaeaea;
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
    transition: transform .25s, box-shadow .25s, border-color .25s;
}
.post-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
    border-color: rgba(0, 102, 255, .3);
    background: #fafcff;
}

.post-card-thumb {
    position: relative;
    width: 100%;
    height: 180px;
    border-radius: var(--radius-s);
    overflow: hidden;
    background: var(--bg);
    margin-bottom: 14px;
    flex-shrink: 0;
}
.post-card-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform .3s;
}
.post-card:hover .post-card-thumb img {
    transform: scale(1.05);
}

/* ★ 占位符修复 ★ */
.post-card-thumb img+.post-card-placeholder {
    display: none !important;
}
.post-card-thumb img[src=""],
.post-card-thumb img:not([src]) {
    display: none;
}
.post-card-thumb img[src=""]+.post-card-placeholder,
.post-card-thumb img:not([src])+.post-card-placeholder {
    display: flex !important;
}

.post-card-main {
    flex: 1;
    display: flex;
    flex-direction: column;
}
.post-card-title {
    font-size: 18px;
    font-weight: 700;
    line-height: 1.45;
    margin-bottom: 10px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    word-break: break-all;
    overflow-wrap: anywhere;
}
.post-card-title a {
    color: var(--text);
}
.post-card-title a:hover {
    color: var(--primary);
}
.post-card-desc {
    font-size: 13.5px;
    color: var(--text-2);
    line-height: 1.7;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    word-break: break-all;
    overflow-wrap: anywhere;
    flex: 1;
    margin-bottom: 12px;
}
.post-card-foot {
    font-size: 12.5px;
    color: var(--text-3);
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: auto;
    border-top: 1px dashed var(--border);
    padding-top: 12px;
}
.post-card-foot .sep {
    color: var(--border);
}
.post-card-cat {
    color: var(--primary);
}

/* ============ 面包屑 ============ */
.page-body {
    padding: 28px 0 56px;
}
.breadcrumb {
    font-size: 13px;
    color: var(--text-3);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 6px;
}
.breadcrumb a {
    color: var(--text-3);
}
.breadcrumb a:hover {
    color: var(--primary);
}
.crumb-current {
    color: var(--text-2);
}

/* ============ 归档页 ============ */
.archive-head {
    margin-bottom: 24px;
}
.archive-title {
    font-size: 28px;
    font-weight: 800;
}
.archive-desc {
    color: var(--text-2);
    margin-top: 8px;
    font-size: 14px;
}

/* ============ 文章详情 ============ */
.post-detail {
    max-width: 860px;
    margin: 0 auto;
}

.post-header-card {
    display: flex;
    align-items: center;
    gap: 18px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
    flex-wrap: wrap;
}
.post-header-card .post-ico,
.post-header-card .tool-ico {
    width: 72px;
    height: 72px;
    border-radius: 18px;
}
.post-header-card .tool-ico-letter {
    font-size: 34px;
}
.post-header-card .tool-ico-emoji {
    font-size: 38px;
}
.post-header-info {
    flex: 1;
    min-width: 200px;
}
.post-title {
    font-size: 26px;
    font-weight: 800;
    line-height: 1.35;
    margin-bottom: 8px;
    word-break: break-all;
    overflow-wrap: anywhere;
}
.post-sub {
    font-size: 13px;
    color: var(--text-3);
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}
.post-sub .sep {
    color: var(--border);
}
.post-sub a {
    color: var(--primary);
}

.visit-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: linear-gradient(135deg, var(--primary), #3385ff);
    color: #fff !important;
    font-size: 15px;
    font-weight: 600;
    padding: 12px 28px;
    border-radius: 999px;
    box-shadow: 0 6px 16px rgba(0, 102, 255, .3);
    transition: transform .2s, box-shadow .2s;
}
.visit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 24px rgba(0, 102, 255, .4);
}

.page-header-card {
    justify-content: center;
    text-align: center;
}

.post-content {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 36px;
    box-shadow: var(--shadow);
    font-size: 15.5px;
    line-height: 1.9;
    color: var(--text);
    word-wrap: break-word;
}
.post-content h1,
.post-content h2,
.post-content h3,
.post-content h4 {
    margin: 1.4em 0 .6em;
    line-height: 1.4;
    font-weight: 700;
}
.post-content h2 {
    font-size: 22px;
    padding-left: 12px;
    border-left: 4px solid var(--primary);
}
.post-content h3 {
    font-size: 18px;
}
.post-content p {
    margin-bottom: 1em;
}
.post-content a {
    color: var(--primary);
    text-decoration: underline;
    text-underline-offset: 3px;
}
.post-content img {
    border-radius: var(--radius-s);
    margin: 8px 0;
}
.post-content ul,
.post-content ol {
    padding-left: 1.6em;
    margin-bottom: 1em;
}
.post-content ul li {
    list-style: disc;
}
.post-content ol li {
    list-style: decimal;
}
.post-content blockquote {
    margin: 1em 0;
    padding: 14px 18px;
    background: var(--primary-light);
    border-left: 4px solid var(--primary);
    border-radius: 0 var(--radius-s) var(--radius-s) 0;
    color: var(--text-2);
}
.post-content code {
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    font-size: 13.5px;
    background: #f2f3f5;
    padding: 2px 6px;
    border-radius: 4px;
}
.post-content pre {
    background: #282c34;
    color: #abb2bf;
    padding: 16px 18px;
    border-radius: var(--radius-s);
    overflow-x: auto;
    margin-bottom: 1em;
}
.post-content pre code {
    background: none;
    padding: 0;
    color: inherit;
}
.post-content table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1em;
    font-size: 14px;
}
.post-content th,
.post-content td {
    border: 1px solid var(--border);
    padding: 8px 12px;
    text-align: left;
}
.post-content th {
    background: var(--bg);
}
.post-content hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 2em 0;
}

.post-footer {
    margin-top: 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
}
.post-tags a {
    display: inline-block;
    font-size: 12.5px;
    color: var(--text-2);
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 4px 14px;
    margin-right: 8px;
    transition: all .2s;
}
.post-tags a:hover {
    color: var(--primary);
    border-color: var(--primary);
}
.post-update {
    font-size: 12.5px;
    color: var(--text-3);
}

/* ============ 相关推荐 ============ */
.related-section {
    margin-top: 48px;
}
.related-title {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
}
.related-title::before {
    content: "";
    width: 6px;
    height: 20px;
    border-radius: 3px;
    margin-right: 10px;
    background: linear-gradient(180deg, var(--primary), #00b8d9);
}
.related-section .tool-grid {
    grid-template-columns: repeat(3, 1fr);
}

/* ============ 评论 ============ */
.comments-area {
    max-width: 860px;
    margin: 48px auto 0;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    box-shadow: var(--shadow);
}
.comments-title,
.respond-title {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 20px;
}
.comment-list {
    list-style: none;
}
.comment-item {
    display: flex;
    gap: 12px;
    padding: 16px 0;
}
.comment-avatar img {
    width: 44px;
    height: 44px;
    border-radius: 50%;
}
.comment-main {
    flex: 1;
    min-width: 0;
}
.comment-meta {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 6px;
    font-size: 13px;
}
.comment-author {
    font-weight: 600;
    font-size: 14px;
}
.comment-by-author .comment-author::after {
    content: "作者";
    font-size: 11px;
    color: #fff;
    background: var(--primary);
    border-radius: 4px;
    padding: 1px 6px;
    margin-left: 6px;
    font-weight: 400;
}
.comment-date {
    color: var(--text-3);
}
.comment-reply a {
    color: var(--primary);
    font-size: 13px;
}
.comment-text {
    font-size: 14.5px;
    color: var(--text);
    line-height: 1.7;
}
.comment-text p {
    margin-bottom: .5em;
}
.comment-awaiting {
    color: #f97316;
    font-size: 13px;
}
.comment-children {
    margin-left: 56px;
    border-left: 2px solid var(--border);
    padding-left: 16px;
}
.comment-pagination {
    margin-top: 8px;
}

.respond {
    margin-top: 28px;
    border-top: 1px solid var(--border);
    padding-top: 24px;
}
.cancel-comment-reply {
    text-align: right;
    font-size: 13px;
}
.cancel-comment-reply a {
    color: #ef4444;
}
.comment-fields {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 12px;
}
.comment-fields input,
.respond textarea {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: var(--radius-s);
    background: var(--bg);
    padding: 10px 14px;
    transition: border-color .2s, box-shadow .2s, background .2s;
}
.comment-fields input:focus,
.respond textarea:focus {
    border-color: var(--primary);
    background: #fff;
    box-shadow: 0 0 0 3px var(--primary-light);
}
.respond textarea {
    resize: vertical;
    margin-bottom: 14px;
}
.submit {
    background: linear-gradient(135deg, var(--primary), #3385ff);
    color: #fff;
    font-size: 14.5px;
    font-weight: 600;
    padding: 10px 32px;
    border-radius: 999px;
    transition: transform .2s, box-shadow .2s;
}
.submit:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(0, 102, 255, .35);
}
.comment-login {
    font-size: 13.5px;
    color: var(--text-2);
    margin-bottom: 12px;
}
.comment-login a {
    color: var(--primary);
}
.comment-closed {
    color: var(--text-3);
    font-size: 14px;
}

/* ============ 分页 ============ */
.pagination {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin: 36px 0 12px;
    flex-wrap: wrap;
}
.pagination li {
    display: inline-block;
}
.pagination a,
.pagination span {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 38px;
    height: 38px;
    padding: 0 12px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius-s);
    font-size: 14px;
    color: var(--text-2);
    transition: all .2s;
}
.pagination a:hover {
    color: var(--primary);
    border-color: var(--primary);
}
.pagination .current {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
    font-weight: 600;
}

/* ============ 空状态 / 404 ============ */
.empty-box {
    text-align: center;
    padding: 64px 0;
}
.empty-box>p {
    color: var(--text-3);
    margin-bottom: 24px;
}
.nf-code {
    font-size: 88px !important;
    font-weight: 800;
    line-height: 1;
    background: linear-gradient(120deg, var(--primary), #7c3aed);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent !important;
    margin-bottom: 8px !important;
}
.nf-text {
    font-size: 17px;
    color: var(--text-2) !important;
}
.nf-home {
    display: inline-block;
    margin-top: 20px;
    color: var(--primary);
    font-weight: 600;
}
.empty-box .hero-search {
    margin-bottom: 0;
}

/* ============ 页脚 ============ */
.site-footer {
    background: #161b26;
    color: #9aa4b8;
    margin-top: 48px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 1.6fr 1fr 1fr 1fr;
    gap: 40px;
    padding: 48px 0 36px;
}
.footer-logo {
    font-size: 22px;
    margin-bottom: 12px;
}
.footer-logo .logo-hub {
    color: #fff;
}
.footer-desc {
    font-size: 13.5px;
    line-height: 1.7;
}
.footer-col h4 {
    color: #fff;
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 16px;
}
.footer-col ul li {
    margin-bottom: 10px;
}
.footer-col a {
    color: #9aa4b8;
    font-size: 13.5px;
    transition: color .2s;
    display: inline-block;
    max-width: 100%;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.footer-col a:hover {
    color: #fff;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, .08);
    padding: 18px 0;
}
.footer-bottom-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px;
    font-size: 13px;
}
.footer-bottom a {
    color: #9aa4b8;
}
.footer-bottom a:hover {
    color: #fff;
}
.footer-bottom .sep {
    margin: 0 8px;
    opacity: .4;
}

/* ============ 返回顶部 ============ */
.back-top {
    position: fixed;
    right: 24px;
    bottom: 32px;
    z-index: 90;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: #fff;
    color: var(--text-2);
    border: 1px solid var(--border);
    box-shadow: 0 4px 16px rgba(29, 33, 41, .12);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(12px);
    transition: all .3s;
}
.back-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.back-top:hover {
    color: var(--primary);
    border-color: var(--primary);
}

/* ============ 入场动画 ============ */
@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}
.tool-card {
    animation: fadeUp .5s ease both;
}
.tool-grid>.tool-card:nth-child(2) {
    animation-delay: .05s;
}
.tool-grid>.tool-card:nth-child(3) {
    animation-delay: .1s;
}
.tool-grid>.tool-card:nth-child(4) {
    animation-delay: .15s;
}
@media (prefers-reduced-motion: reduce) {
    .tool-card {
        animation: none;
    }
    html {
        scroll-behavior: auto;
    }
}

/* ============ 响应式 ============ */
@media (max-width: 1200px) {
    .tool-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    .related-section .tool-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}
@media (max-width: 1080px) {
    .post-list {
        grid-template-columns: 1fr;
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 28px;
    }
}
@media (max-width: 860px) {
    .tool-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .related-section .tool-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .hero {
        padding: 52px 0 44px;
    }
    .hero-title {
        font-size: 32px;
    }
    .hero-desc {
        font-size: 15px;
    }
    .header-search input {
        width: 100px;
    }
    .post-content {
        padding: 24px 20px;
    }
    .logo-hub {
        max-width: 200px;
    }
}
@media (max-width: 640px) {
    /* ★ 通用修复：防止右侧空白溢出 ★ */
    html,
    body {
        overflow-x: hidden;
        max-width: 100%;
    }
    .wrapper {
        max-width: 100%;
        padding-left: 16px;
        padding-right: 16px;
        overflow: hidden;
        box-sizing: border-box;
    }
    .hero {
        overflow: hidden;
    }
    .hero-inner {
        padding: 0;
        overflow: hidden;
    }
    img {
        max-width: 100% !important;
        height: auto !important;
    }

    /* ★ 移动端导航栏折叠 ★ */
    .header-search {
        display: none;
    }
    .nav-toggle {
        display: flex;
        flex-shrink: 0;
    }
    .main-nav {
        position: absolute;
        top: var(--header-h);
        left: 0;
        right: 0;
        background: #fff;
        border-bottom: 1px solid var(--border);
        box-shadow: 0 12px 24px rgba(29, 33, 41, .08);
        max-height: 0;
        overflow: hidden;
        transition: max-height .3s ease;
        z-index: 150;
    }
    .main-nav.open {
        max-height: 480px;
        overflow-y: auto;
    }
    .main-nav>ul {
        flex-direction: column;
        padding: 12px 16px 16px;
        gap: 2px;
        overflow: visible;
    }
    .main-nav>ul>li {
        flex-shrink: 1;
    }
    .main-nav a {
        padding: 10px 14px;
        white-space: normal;
    }

    /* ★ 移动端下拉菜单展开式（点击） ★ */
    .main-nav li.has-dropdown {
        display: flex;
        flex-wrap: wrap;
        align-items: center;
    }
    .main-nav li.has-dropdown>a {
        flex: 1;
    }
    .main-nav .dropdown-toggle {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 44px;
        height: 44px;
        font-size: 14px;
        color: var(--text-3);
        background: transparent;
        border: none;
        border-radius: 6px;
        transition: transform 0.25s;
        cursor: pointer;
        flex-shrink: 0;
    }
    .main-nav li.has-dropdown.open>.dropdown-toggle {
        transform: rotate(180deg);
    }

    .main-nav .dropdown {
        position: static;
        display: none;
        width: 100%;
        box-shadow: none;
        border: none;
        border-left: 2px solid var(--border);
        border-radius: 0;
        padding: 0 0 0 16px;
        margin: 4px 0 4px 8px;
        background: transparent;
        transform: none;
    }
    .main-nav li.has-dropdown.open>.dropdown {
        display: block !important;
    }

    /* ★ 移动端工具卡片：双列，但强制宽度100%防止溢出 ★ */
    .tool-grid {
        grid-template-columns: 1fr 1fr;
        gap: 12px;
        width: 100%;
    }
    .tool-card {
        width: 100%;
        box-sizing: border-box;
        min-width: 0;
    }
    .tool-thumb {
        height: 110px;
    }
    .tool-body {
        padding: 10px 12px 12px;
    }
    .tool-name {
        font-size: 13px;
        -webkit-line-clamp: 2;
    }
    .tool-date {
        font-size: 10px;
    }
    .tool-desc {
        font-size: 11.5px;
        -webkit-line-clamp: 1;
        min-height: 1.2em;
        margin-bottom: 8px;
    }
    .tool-foot {
        flex-wrap: wrap;
        gap: 4px;
        padding-top: 8px;
    }
    .tool-catname {
        font-size: 10px;
    }
    .tool-go {
        font-size: 11px;
    }

    /* ★ 移动端文章卡片 ★ */
    .post-list {
        grid-template-columns: 1fr;
        gap: 16px;
        width: 100%;
    }
    .post-card {
        padding: 16px;
        width: 100%;
        box-sizing: border-box;
    }
    .post-card-thumb {
        height: 160px;
    }
    .post-card-title {
        font-size: 15.5px;
        -webkit-line-clamp: 2;
    }
    .post-card-desc {
        font-size: 13px;
        -webkit-line-clamp: 2;
    }

    /* ★ 相关推荐在移动端也强制双列并防止溢出 ★ */
    .related-section .tool-grid {
        grid-template-columns: 1fr 1fr;
        gap: 12px;
        width: 100%;
    }

    /* ★ 文章内容区表格、代码块防止溢出 ★ */
    .post-content table,
    .post-content pre,
    .post-content code {
        max-width: 100%;
        overflow-x: auto;
        display: block;
        word-wrap: break-word;
        white-space: pre-wrap;
        box-sizing: border-box;
    }

    /* 其他移动端样式 */
    .hero-title {
        font-size: 26px;
    }
    .hero-search button {
        padding: 0 18px;
    }
    .post-header-card {
        padding: 20px;
        gap: 14px;
    }
    .post-header-card .post-ico,
    .post-header-card .tool-ico {
        width: 56px;
        height: 56px;
        border-radius: 14px;
    }
    .post-title {
        font-size: 20px;
        word-break: break-all;
        overflow-wrap: anywhere;
    }
    .visit-btn {
        width: 100%;
        justify-content: center;
    }
    .comment-fields {
        grid-template-columns: 1fr;
    }
    .comment-children {
        margin-left: 20px;
    }
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 24px;
        padding: 36px 0 24px;
    }
    .footer-bottom-inner {
        justify-content: center;
        text-align: center;
    }
    .cat-title {
        font-size: 19px;
    }
    .archive-title {
        font-size: 23px;
        word-break: break-all;
        overflow-wrap: anywhere;
    }
    .logo-hub {
        max-width: 150px;
        font-size: 17px;
    }
}

/* ============ 无图占位符 ============ */
.tool-icon-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #f0f3f7, #e5e8ef);
    color: #cdd2d9;
    font-size: 42px;
    font-weight: bold;
}
.post-card-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #eef2f7;
    color: #b0b7c5;
    font-size: 38px;
    font-weight: bold;
    position: absolute;
    inset: 0;
}

/* ---------- 上一篇/下一篇样式 ---------- */
.post-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 30px 0 20px;
    padding-top: 20px;
    border-top: 1px solid var(--border, #eef0f3);
    gap: 16px;
}

.post-nav .prev,
.post-nav .next {
    flex: 1;
    min-width: 0;
    font-size: 14px;
    color: var(--text-2, #4e5969);
}

.post-nav .prev {
    text-align: left;
}

.post-nav .next {
    text-align: right;
}

.post-nav a {
    display: inline-block;
    color: var(--primary, #0066ff);
    text-decoration: none;
    transition: color 0.2s;
    max-width: 100%;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.post-nav a:hover {
    color: var(--primary-dark, #0052cc);
}

.post-nav span {
    color: var(--text-3, #86909c);
}

/* 移动端适配 */
@media (max-width: 640px) {
    .post-nav {
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
    }
    .post-nav .prev,
    .post-nav .next {
        text-align: center;
    }
    .post-nav a {
        white-space: normal;
        overflow: visible;
        text-overflow: clip;
    }
}

/* ============ Footer 响应式优化 ============ */
.footer-grid {
    display: grid;
    grid-template-columns: 1.6fr 1fr 1fr 1fr;
    gap: 40px;
    padding: 48px 0 36px;
}
.footer-col {
    min-width: 0; /* 防止内容溢出 */
}
.footer-col ul li {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.footer-col ul li a {
    display: block;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
/* 品牌列特殊处理 */
.footer-brand .footer-logo {
    display: inline-block;
    margin-bottom: 12px;
}
.footer-brand .footer-desc {
    font-size: 13.5px;
    line-height: 1.7;
    color: #9aa4b8;
}

/* 平板适配 */
@media (max-width: 1080px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 28px;
    }
    .footer-brand {
        grid-column: 1 / -1; /* 品牌列占满一行 */
    }
}

/* 手机适配 */
@media (max-width: 640px) {
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 24px;
        padding: 36px 0 24px;
    }
    .footer-col {
        text-align: center;
    }
    .footer-col ul li {
        display: inline-block;
        margin: 0 6px 6px 0;
        white-space: normal; /* 允许换行 */
        overflow: visible;
        text-overflow: clip;
    }
    .footer-col ul li a {
        white-space: normal;
        display: inline;
    }
    .footer-brand .footer-desc {
        text-align: center;
    }
    .footer-bottom-inner {
        flex-direction: column;
        text-align: center;
        gap: 4px;
    }
}

/* ★ PC端：隐藏下拉菜单相关元素 ★ */
@media (min-width: 641px) {
    /* 隐藏下拉菜单切换按钮 */
    .main-nav .dropdown-toggle {
        display: none !important;
    }
    /* 隐藏下拉菜单本身 */
    .main-nav .dropdown {
        display: none !important;
    }
    /* 移除小三角指示器 */
    .main-nav li.has-dropdown > a::after {
        content: none !important;
    }
}

/* ============ 工具分类导航 ============ */
.tool-cat-nav {
    margin-bottom: 24px;
    padding: 16px 20px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}
.tool-cat-nav-inner {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px 12px;
}
.tool-cat-nav .nav-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-2);
}
.tool-cat-nav a {
    padding: 4px 14px;
    border-radius: 20px;
    font-size: 13px;
    color: var(--text-2);
    background: var(--bg);
    border: 1px solid var(--border);
    transition: all 0.2s;
}
.tool-cat-nav a:hover {
    color: var(--primary);
    border-color: var(--primary);
    background: var(--primary-light);
}
.tool-cat-nav a.current {
    color: #fff;
    background: var(--primary);
    border-color: var(--primary);
}
.tool-cat-nav .tag-link {
    margin-left: auto;
    color: var(--primary);
    background: transparent;
    border: none;
    font-weight: 600;
}
.tool-cat-nav .tag-link:hover {
    background: transparent;
    text-decoration: underline;
}
@media (max-width: 640px) {
    .tool-cat-nav-inner {
        gap: 6px 8px;
    }
    .tool-cat-nav a {
        padding: 3px 10px;
        font-size: 12px;
    }
    .tool-cat-nav .tag-link {
        margin-left: 0;
        width: 100%;
        text-align: center;
    }
}

/* ============ 工具卡片：标题 + 小标题 ============ */
.tool-title-group {
    flex: 1;
    min-width: 0;
}
.tool-name {
    font-size: 15.5px;
    font-weight: 600;
    line-height: 1.3;
    margin: 0 0 2px 0;
}
.tool-name a {
    color: var(--text);
}
.tool-name a:hover {
    color: var(--primary);
}
.tool-subtitle {
    font-size: 13px;
    color: var(--text-3);
    margin: 0;
    line-height: 1.4;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* ============ 文章详情页小标题 ============ */
.post-subtitle {
    font-size: 16px;
    color: var(--text-3);
    margin: 4px 0 8px 0;
    font-weight: 400;
}