/* ============================================================
   PE工具箱官网 前台样式
   蓝色科技风 · 与原站结构保持一致
   ============================================================ */
:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --primary-soft: #eff6ff;
    --grad: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    --ink: #0f172a;
    --text: #52525b;
    --muted: #94a3b8;
    --line: #e2e8f0;
    --bg: #f8fafc;
    --card: #ffffff;
    --radius: 14px;
    --shadow: 0 1px 3px rgba(15, 23, 42, .06), 0 8px 24px rgba(15, 23, 42, .05);
}

* { 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", Arial, sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.7;
    font-size: 15px;
}

img { max-width: 100%; height: auto; }
a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-dark); }

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* ---------- 顶部公告 ---------- */
.top-notice {
    background: var(--grad);
    color: #fff;
    text-align: center;
    font-size: 13px;
    padding: 9px 16px;
    border-radius: 0 0 12px 12px;
    letter-spacing: .3px;
}

/* ---------- 头部导航 ---------- */
.main-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 0;
    flex-wrap: wrap;
    gap: 12px;
}

.brand {
    font-size: 24px;
    font-weight: 800;
    color: var(--ink);
    letter-spacing: .5px;
    display: flex;
    align-items: center;
    gap: 10px;
}
.brand::before {
    content: "";
    width: 34px; height: 34px;
    background: var(--grad);
    border-radius: 10px;
    display: inline-block;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Crect x='3' y='11' width='10' height='11' rx='2'/%3E%3Cpath d='M7 11V7a5 5 0 0 1 10 0v4'/%3E%3Ccircle cx='8' cy='16.5' r='1' fill='white' stroke='none'/%3E%3C/svg%3E");
    background-size: 20px;
    background-position: center;
    background-repeat: no-repeat;
}

.nav-links { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; }
.nav-links a {
    color: var(--ink);
    font-size: 15px;
    font-weight: 500;
    padding: 8px 14px;
    border-radius: 10px;
    transition: all .2s;
}
.nav-links a:hover { color: var(--primary); background: var(--primary-soft); }
.nav-links a.active { color: #fff; background: var(--grad); }

/* 移动端菜单按钮 */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 10px;
    cursor: pointer;
}
.nav-toggle span { width: 20px; height: 2px; background: var(--ink); border-radius: 2px; transition: .3s; }
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero 首屏 ---------- */
.hero-section {
    display: grid;
    grid-template-columns: 1.1fr .9fr;
    gap: 40px;
    align-items: center;
    padding: 56px 0 64px;
    margin-top: 8px;
}
.hero-content h1 {
    font-size: 38px;
    line-height: 1.3;
    color: var(--ink);
    font-weight: 800;
    margin-bottom: 18px;
    background: linear-gradient(120deg, #0f172a 30%, var(--primary) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}
.hero-content p { font-size: 16px; color: var(--text); margin-bottom: 26px; max-width: 540px; }
.download-group { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.download-btn {
    display: inline-block;
    background: var(--grad);
    color: #fff;
    font-size: 16px;
    font-weight: 700;
    padding: 14px 34px;
    border-radius: 12px;
    box-shadow: 0 8px 20px rgba(37, 99, 235, .32);
    transition: all .25s;
}
.download-btn:hover { transform: translateY(-2px); box-shadow: 0 12px 26px rgba(37, 99, 235, .4); color: #fff; }
.download-btn-ghost { background: #fff; color: var(--primary); border: 1.5px solid var(--primary); box-shadow: none; }
.download-btn-ghost:hover { background: var(--primary-soft); color: var(--primary-dark); box-shadow: none; }
.version-info { font-size: 13px; color: var(--muted); }
.hero-image-box img {
    width: 100%;
    border-radius: 20px;
    box-shadow: var(--shadow);
    background: #fff;
}

/* ---------- 区块通用 ---------- */
.block-title {
    font-size: 28px;
    font-weight: 800;
    color: var(--ink);
    text-align: center;
    margin-bottom: 10px;
    position: relative;
}
.block-title::after {
    content: "";
    display: block;
    width: 56px; height: 4px;
    background: var(--grad);
    border-radius: 4px;
    margin: 14px auto 0;
}
.block-subtitle { text-align: center; color: var(--muted); margin-bottom: 34px; font-size: 14px; }
section { padding: 56px 0; }

/* ---------- 核心功能 ---------- */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-top: 30px;
}
.feature-card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 26px 22px;
    transition: all .25s;
    box-shadow: 0 1px 2px rgba(15,23,42,.04);
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: #c7d7fe; }
.feature-card h3 {
    font-size: 17px;
    color: var(--ink);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.feature-card h3::before {
    content: "";
    width: 10px; height: 10px;
    border-radius: 3px;
    background: var(--grad);
    flex: none;
}
.feature-card p { font-size: 14px; color: var(--text); }

/* ---------- 常用工具 ---------- */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 30px;
}
.tool-box {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 26px 24px;
    transition: all .25s;
}
.tool-box:hover { box-shadow: var(--shadow); transform: translateY(-4px); }
.tool-box h3 {
    font-size: 17px;
    color: var(--primary);
    margin-bottom: 14px;
    padding-bottom: 12px;
    border-bottom: 1px dashed var(--line);
}
.tool-box ul { list-style: none; }
.tool-box li {
    padding: 7px 0 7px 24px;
    position: relative;
    font-size: 14.5px;
}
.tool-box li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: 700;
}

/* ---------- 使用步骤 ---------- */
.steps-flow {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-top: 30px;
}
.step-item {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 28px 22px;
    text-align: center;
    transition: all .25s;
}
.step-item:hover { box-shadow: var(--shadow); transform: translateY(-4px); }
.step-number {
    width: 46px; height: 46px;
    margin: 0 auto 14px;
    background: var(--grad);
    color: #fff;
    font-size: 20px;
    font-weight: 800;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}
.step-item h3 { color: var(--ink); font-size: 16px; margin-bottom: 8px; }
.step-item p { font-size: 13.5px; color: var(--text); }

/* ---------- 资讯卡片 ---------- */
.article-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-top: 30px;
}
.article-card {
    display: block;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 22px;
    transition: all .25s;
}
.article-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: #c7d7fe; }
.article-card h3 {
    font-size: 18px;
    color: var(--ink);
    margin-bottom: 8px;
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.article-card p {
    font-size: 14px;
    color: var(--text);
    margin-top: 8px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.article-meta { display: flex; gap: 16px; font-size: 12.5px; color: var(--muted); }
.more-link { text-align: center; margin-top: 26px; }
.more-link a {
    display: inline-block;
    color: var(--primary);
    font-weight: 600;
    font-size: 14px;
    border: 1.5px solid var(--primary);
    padding: 8px 22px;
    border-radius: 999px;
    transition: all .2s;
}
.more-link a:hover { background: var(--primary-soft); }

/* ---------- 常见问题 ---------- */
.faq-list { max-width: 860px; margin: 30px auto 0; }
.faq-item {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 12px;
    margin-bottom: 12px;
    overflow: hidden;
    transition: border-color .2s;
}
.faq-item.open { border-color: #c7d7fe; }
.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    padding: 17px 20px;
    font-weight: 600;
    color: var(--ink);
    font-size: 15px;
    cursor: pointer;
    user-select: none;
}
.faq-question:hover { background: var(--primary-soft); }
.faq-icon {
    color: var(--primary);
    font-size: 14px;
    transition: transform .25s;
    flex: none;
}
.faq-item.open .faq-icon { transform: rotate(180deg); }
.faq-answer {
    display: none;
    padding: 0 20px 18px;
    font-size: 14.5px;
    color: var(--text);
}
.faq-item.open .faq-answer { display: block; }
.faq-answer p { margin-bottom: 8px; }
.faq-more { margin-top: 10px; font-size: 13px; }

/* ---------- 独立页面横幅 ---------- */
.page-banner {
    background: var(--grad);
    border-radius: 18px;
    color: #fff;
    padding: 46px 40px;
    margin: 24px 0 8px;
    text-align: center;
}
.page-banner h1 { font-size: 30px; font-weight: 800; margin-bottom: 8px; }
.page-banner p { opacity: .92; font-size: 15px; }

/* ---------- 内容双栏布局 ---------- */
.content-layout {
    display: flex;
    gap: 26px;
    align-items: flex-start;
    padding: 34px 0 50px;
}
.content-main { flex: 1; min-width: 0; }

/* ---------- 右侧栏 ---------- */
.sidebar { width: 320px; flex: none; display: flex; flex-direction: column; gap: 18px; }
.side-card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 20px;
}
.side-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--ink);
    margin-bottom: 14px;
    padding-left: 12px;
    border-left: 4px solid var(--primary);
    line-height: 1.3;
}
.side-list { list-style: none; }
.side-list li {
    display: flex;
    align-items: baseline;
    gap: 8px;
    padding: 8px 0;
    border-bottom: 1px dashed var(--line);
}
.side-list li:last-child { border-bottom: none; }
.side-list a {
    color: var(--ink);
    font-size: 14px;
    line-height: 1.5;
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.side-list a:hover { color: var(--primary); }
.side-date { font-size: 12px; color: var(--muted); flex: none; }
.side-rank {
    width: 20px; height: 20px;
    flex: none;
    background: var(--line);
    color: var(--text);
    font-size: 12px;
    font-weight: 700;
    border-radius: 6px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}
.side-rank.rank-1, .side-rank.rank-2, .side-rank.rank-3 { background: var(--grad); color: #fff; }
.side-cats li { display: block; }
.side-empty { color: var(--muted); font-size: 13.5px; }

/* ---------- 分类页签 ---------- */
.cat-tabs { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 22px; }
.cat-tabs a {
    color: var(--ink);
    background: var(--card);
    border: 1px solid var(--line);
    padding: 7px 16px;
    border-radius: 999px;
    font-size: 14px;
    transition: all .2s;
}
.cat-tabs a:hover { border-color: var(--primary); color: var(--primary); }
.cat-tabs a.active { background: var(--grad); color: #fff; border-color: transparent; }

/* ---------- 资讯列表页 ---------- */
.article-list { display: flex; flex-direction: column; gap: 16px; }
.article-list-item {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 24px;
    transition: all .25s;
}
.article-list-item:hover { box-shadow: var(--shadow); transform: translateY(-2px); }
.article-list-item h2 { font-size: 19px; margin-bottom: 10px; }
.article-list-item h2 a { color: var(--ink); }
.article-list-item h2 a:hover { color: var(--primary); }
.article-list-item p { font-size: 14.5px; margin-top: 10px; }

/* ---------- 面包屑 ---------- */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13.5px;
    color: var(--muted);
    padding: 26px 0 0;
    flex-wrap: wrap;
}
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb .current { color: var(--ink); max-width: 420px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ---------- 文章详情 ---------- */
.article-detail {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 36px 38px;
    margin-top: 14px;
}
.article-detail h1 {
    font-size: 28px;
    line-height: 1.45;
    color: var(--ink);
    font-weight: 800;
    margin-bottom: 14px;
}
.article-detail .article-meta { margin-bottom: 20px; padding-bottom: 18px; border-bottom: 1px solid var(--line); }
.article-cover { margin-bottom: 22px; border-radius: 12px; overflow: hidden; }
.article-cover img { display: block; width: 100%; }
.article-summary {
    background: var(--primary-soft);
    border-left: 4px solid var(--primary);
    padding: 14px 18px;
    border-radius: 0 10px 10px 0;
    font-size: 14.5px;
    color: #334155;
    margin-bottom: 22px;
}
.article-content { font-size: 15.5px; color: #334155; line-height: 1.9; word-wrap: break-word; }
.article-content h2 { font-size: 22px; color: var(--ink); margin: 28px 0 12px; }
.article-content h3 { font-size: 18px; color: var(--ink); margin: 22px 0 10px; }
.article-content p { margin-bottom: 14px; }
.article-content ul, .article-content ol { margin: 0 0 16px 24px; }
.article-content li { margin-bottom: 6px; }
.article-content a { text-decoration: underline; text-underline-offset: 3px; }
.article-content blockquote {
    border-left: 4px solid var(--primary-light);
    background: var(--primary-soft);
    padding: 12px 18px;
    border-radius: 0 10px 10px 0;
    color: #475569;
    margin: 16px 0;
}
.article-content img { border-radius: 10px; margin: 8px 0; }
.article-content table { border-collapse: collapse; width: 100%; margin: 14px 0; font-size: 14.5px; }
.article-content th, .article-content td { border: 1px solid var(--line); padding: 9px 12px; text-align: left; }
.article-content th { background: var(--primary-soft); color: var(--ink); font-weight: 600; }
.article-content code {
    background: #f1f5f9;
    border: 1px solid var(--line);
    border-radius: 5px;
    padding: 2px 6px;
    font-size: 13.5px;
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}
.article-content pre {
    background: #0f172a;
    color: #e2e8f0;
    padding: 16px 18px;
    border-radius: 10px;
    overflow-x: auto;
    margin: 14px 0;
    font-size: 13.5px;
}
.article-content pre code { background: none; border: none; color: inherit; padding: 0; }

.article-tags { margin-top: 26px; padding-top: 18px; border-top: 1px solid var(--line); display: flex; gap: 8px; flex-wrap: wrap; }
.tag {
    background: var(--primary-soft);
    color: var(--primary);
    font-size: 12.5px;
    padding: 4px 12px;
    border-radius: 999px;
}

/* 上下篇 */
.article-pager {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
    margin-top: 18px;
}
.pager-item {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 14px 18px;
}
.pager-item span { font-size: 12px; color: var(--muted); display: block; margin-bottom: 4px; }
.pager-item a {
    color: var(--ink);
    font-size: 14.5px;
    font-weight: 600;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.pager-item a:hover { color: var(--primary); }

/* ---------- 分页 ---------- */
.pagination { display: flex; gap: 8px; justify-content: center; margin: 34px 0 10px; flex-wrap: wrap; }
.pagination a, .pagination .current {
    min-width: 38px;
    height: 38px;
    padding: 0 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 10px;
    font-size: 14px;
    color: var(--ink);
    transition: all .2s;
}
.pagination a:hover { border-color: var(--primary); color: var(--primary); }
.pagination .current { background: var(--grad); color: #fff; border-color: transparent; }

/* ---------- 其他 ---------- */
.empty-tip { color: var(--muted); text-align: center; padding: 30px 0; }
.faq-list-page { max-width: none; }

/* ---------- 页脚 ---------- */
footer {
    border-top: 1px solid var(--line);
    padding: 30px 0 36px;
    margin-top: 20px;
    text-align: center;
    color: var(--muted);
    font-size: 13.5px;
}
.footer-icp { margin-top: 6px; }
.footer-icp a { color: var(--muted); }
.footer-icp a:hover { color: var(--primary); }

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
    .hero-section { grid-template-columns: 1fr; padding: 36px 0 40px; }
    .hero-image-box { order: -1; max-width: 480px; margin: 0 auto; }
    .feature-grid { grid-template-columns: repeat(2, 1fr); }
    .steps-flow { grid-template-columns: repeat(2, 1fr); }
    .sidebar { width: 260px; }
}
@media (max-width: 720px) {
    .nav-toggle { display: flex; }
    .nav-links {
        display: none;
        width: 100%;
        flex-direction: column;
        align-items: stretch;
        background: var(--card);
        border: 1px solid var(--line);
        border-radius: 14px;
        padding: 10px;
        box-shadow: var(--shadow);
    }
    .nav-links.open { display: flex; }
    .nav-links a { padding: 12px 16px; }
    .hero-content h1 { font-size: 28px; }
    .tools-grid, .article-grid, .feature-grid, .steps-flow { grid-template-columns: 1fr; }
    .content-layout { flex-direction: column; }
    .sidebar { width: 100%; }
    .article-detail { padding: 24px 20px; }
    .article-detail h1 { font-size: 23px; }
    .article-pager { grid-template-columns: 1fr; }
    .page-banner { padding: 34px 22px; }
    .block-title { font-size: 23px; }
}