/* ============================================================
 * CoreUI.cn - 编程新知  主题扩展样式（营销长页 + 下拉导航）
 * 与 style.css 协同，沿用 白/浅黄/深灰/金 视觉体系
 * ============================================================ */

/* ========== 顶部下拉导航 ========== */
.nav-container { position: relative; }
.nav-menu > li { position: relative; }

.nav-menu a .caret {
    display: inline-block;
    width: 0; height: 0;
    margin-left: 5px;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-top: 5px solid var(--color-medium-gray);
    vertical-align: middle;
    transition: transform .3s;
}
.nav-menu > li:hover > a .caret { border-top-color: var(--color-accent); transform: rotate(180deg); }

.sub-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(12px);
    min-width: 240px;
    background: #fff;
    border-radius: 14px;
    box-shadow: 0 18px 50px rgba(0,0,0,.14);
    padding: 12px;
    opacity: 0;
    visibility: hidden;
    transition: all .28s cubic-bezier(.4,0,.2,1);
    z-index: 1001;
    border: 1px solid var(--color-light-gray);
}
.nav-menu > li.has-sub:hover .sub-menu,
.nav-menu > li.has-sub:focus-within .sub-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(6px);
}
.sub-menu a {
    display: block;
    padding: 10px 14px;
    border-radius: 9px;
    font-size: 14px;
    color: var(--color-dark-gray) !important;
    white-space: nowrap;
}
.sub-menu a::after { display: none; }
.sub-menu a:hover { background: var(--color-light-yellow); color: var(--color-dark-gray) !important; padding-left: 18px; }
.sub-menu a.sub-active { color: var(--color-accent) !important; font-weight: 600; }

/* 宽子菜单（网站建设 等大分组）两列 */
.nav-menu > li.has-sub.wide .sub-menu {
    min-width: 460px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2px;
}

/* ========== 次级页 Hero ========== */
.sub-hero {
    padding: 150px 0 70px;
    background: linear-gradient(135deg, var(--color-light-yellow) 0%, #fff 55%, var(--color-pale-yellow) 100%);
    position: relative;
    overflow: hidden;
}
.sub-hero::before {
    content: '';
    position: absolute;
    right: -12%; top: -30%;
    width: 560px; height: 560px;
    background: radial-gradient(circle, rgba(255,215,0,.12), transparent 68%);
    border-radius: 50%;
}
.crumb {
    font-size: 13px;
    color: var(--color-medium-gray);
    margin-bottom: 26px;
    display: flex;
    gap: 8px;
    align-items: center;
    flex-wrap: wrap;
}
.crumb a { color: var(--color-medium-gray); }
.crumb a:hover { color: var(--color-accent); }
.crumb b { font-weight: 400; }
.sub-hero-grid {
    display: grid;
    grid-template-columns: 1.15fr .85fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 2;
}
.sub-hero-copy h1 {
    font-size: 46px;
    font-weight: 800;
    line-height: 1.18;
    margin-bottom: 18px;
    color: var(--color-dark-gray);
}
.sub-hero-desc { font-size: 17px; color: var(--color-medium-gray); line-height: 1.85; margin-bottom: 28px; }
.sub-hero-btns { display: flex; gap: 16px; flex-wrap: wrap; }
.sub-hero-stats {
    display: flex;
    gap: 34px;
    margin-top: 34px;
    flex-wrap: wrap;
}
.hero-stat b { font-size: 30px; font-weight: 800; color: var(--color-accent); display: block; }
.hero-stat span { font-size: 13px; color: var(--color-medium-gray); }
.sub-hero-media img {
    width: 100%;
    border-radius: 20px;
    box-shadow: 0 24px 60px rgba(0,0,0,.16);
    aspect-ratio: 4/3;
    object-fit: cover;
}
.sub-hero-media { position: relative; z-index: 2; }
.sub-hero-media::after {
    content: '';
    position: absolute;
    inset: 18px -18px -18px 18px;
    border: 2px solid var(--color-accent);
    border-radius: 20px;
    z-index: -1;
    opacity: .35;
}

/* ========== 通用区块 ========== */
.section { padding: 78px 0; }
.section.sec-alt { background: var(--color-light-yellow); }
.sec-head { text-align: center; max-width: 760px; margin: 0 auto 48px; }
.sec-eyebrow {
    display: inline-block;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 2px;
    color: var(--color-accent);
    margin-bottom: 10px;
    text-transform: uppercase;
}
.sec-title { font-size: 32px; font-weight: 800; color: var(--color-dark-gray); position: relative; padding-bottom: 16px; }
.sec-title::after {
    content: '';
    position: absolute;
    bottom: 0; left: 50%;
    transform: translateX(-50%);
    width: 52px; height: 3px;
    background: var(--color-accent);
    border-radius: 3px;
}
.sec-intro { margin-top: 14px; font-size: 15px; color: var(--color-medium-gray); line-height: 1.8; }
.sec-head.left { text-align: left; margin: 0 0 36px; }
.sec-head.left .sec-title::after { left: 0; transform: none; }

/* ========== 分栏 ========== */
.split-section { padding: 70px 0; }
.split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 56px;
    align-items: center;
    margin-bottom: 30px;
}
.split.reverse { direction: rtl; }
.split.reverse > * { direction: ltr; }
.split-media img {
    width: 100%;
    border-radius: 18px;
    box-shadow: var(--shadow-hover);
    aspect-ratio: 4/3;
    object-fit: cover;
}
.split-media.media-16 img { aspect-ratio: 16/10; }
.split-body h3 { font-size: 26px; font-weight: 700; margin-bottom: 16px; color: var(--color-dark-gray); }
.split-body p { font-size: 15px; color: var(--color-medium-gray); line-height: 1.9; margin-bottom: 14px; }
.feat-list { margin-top: 6px; }
.feat-list li {
    position: relative;
    padding: 8px 0 8px 30px;
    font-size: 15px;
    color: var(--color-dark-gray);
    border-bottom: 1px dashed var(--color-light-gray);
}
.feat-list li:last-child { border-bottom: none; }
.feat-list li::before {
    content: '✓';
    position: absolute; left: 0; top: 8px;
    width: 20px; height: 20px;
    background: var(--color-accent);
    color: #fff;
    border-radius: 50%;
    font-size: 12px;
    line-height: 20px;
    text-align: center;
    font-weight: 700;
}
.block-note {
    margin-top: 12px;
    padding: 12px 16px;
    background: var(--color-pale-yellow);
    border-left: 4px solid var(--color-accent);
    border-radius: 0 10px 10px 0;
    font-size: 14px;
    color: var(--color-dark-gray);
}

/* ========== 卡片网格 ========== */
.mgrid { display: grid; gap: 26px; }
.mgrid-3 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.mgrid-4 { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
.m-card {
    display: block;
    background: #fff;
    border-radius: 16px;
    padding: 30px 26px;
    box-shadow: var(--shadow-soft);
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
    border: 1px solid transparent;
}
.m-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 4px;
    background: linear-gradient(90deg, var(--color-accent), transparent);
    opacity: 0;
    transition: opacity .3s;
}
.m-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-hover); border-color: var(--color-accent); }
.m-card:hover::before { opacity: 1; }
.card-ico {
    display: inline-flex;
    align-items: center; justify-content: center;
    width: 52px; height: 52px;
    background: var(--color-light-yellow);
    border-radius: 14px;
    font-size: 24px;
    margin-bottom: 16px;
}
.m-card h4 { font-size: 18px; font-weight: 700; margin-bottom: 10px; color: var(--color-dark-gray); }
.m-card p { font-size: 14px; color: var(--color-medium-gray); line-height: 1.8; }
.m-card-more { display: inline-block; margin-top: 12px; font-size: 13px; font-weight: 700; color: var(--color-accent); }

/* ========== 步骤 ========== */
.steps { list-style: none; counter-reset: step; max-width: 900px; margin: 0 auto; }
.step {
    display: flex;
    gap: 22px;
    align-items: flex-start;
    padding: 22px 0;
    position: relative;
}
.step:not(:last-child)::after {
    content: '';
    position: absolute;
    left: 25px; top: 74px; bottom: -2px;
    width: 2px;
    background: linear-gradient(var(--color-accent), transparent);
}
.step-num {
    flex: 0 0 52px;
    width: 52px; height: 52px;
    background: #fff;
    border: 2px solid var(--color-accent);
    color: var(--color-accent);
    font-weight: 800;
    font-size: 18px;
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    box-shadow: var(--shadow-soft);
    position: relative; z-index: 2;
}
.step-body h4 { font-size: 19px; font-weight: 700; margin-bottom: 8px; color: var(--color-dark-gray); }
.step-body p { font-size: 15px; color: var(--color-medium-gray); line-height: 1.85; }

/* ========== 表格 ========== */
.table-wrap { overflow-x: auto; border-radius: 14px; box-shadow: var(--shadow-soft); }
.m-table { width: 100%; border-collapse: collapse; background: #fff; min-width: 640px; }
.m-table th {
    background: var(--color-dark-gray);
    color: #fff;
    padding: 15px 18px;
    font-size: 14px;
    text-align: left;
    white-space: nowrap;
}
.m-table td { padding: 14px 18px; font-size: 14px; color: var(--color-dark-gray); border-bottom: 1px solid var(--color-light-gray); }
.m-table tbody tr:nth-child(even) { background: var(--color-light-yellow); }
.m-table tbody tr:hover { background: var(--color-pale-yellow); }

/* ========== FAQ ========== */
.faq-list { max-width: 860px; margin: 0 auto; display: grid; gap: 14px; }
.faq-item {
    background: #fff;
    border-radius: 14px;
    box-shadow: var(--shadow-soft);
    overflow: hidden;
}
.faq-item summary {
    list-style: none;
    cursor: pointer;
    padding: 20px 24px;
    font-size: 16px;
    font-weight: 600;
    color: var(--color-dark-gray);
    position: relative;
    padding-right: 46px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
    content: '+';
    position: absolute;
    right: 22px; top: 50%;
    transform: translateY(-50%);
    width: 26px; height: 26px;
    background: var(--color-light-yellow);
    border-radius: 50%;
    color: var(--color-accent);
    font-size: 18px;
    display: flex; align-items: center; justify-content: center;
    transition: transform .3s;
}
.faq-item[open] summary::after { transform: translateY(-50%) rotate(45deg); }
.faq-body { padding: 0 24px 22px; }
.faq-body p { font-size: 15px; color: var(--color-medium-gray); line-height: 1.9; }

/* ========== 长文段落 ========== */
.rich-p {
    max-width: 860px;
    margin: 0 auto 22px;
    font-size: 15.5px;
    line-height: 2;
    color: #3d3d3d;
    text-align: justify;
}
.rich-p:first-child::first-letter { font-size: 30px; font-weight: 800; color: var(--color-accent); }

/* ========== 观点墙 ========== */
.quotes { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 26px; }
.quote-card {
    background: #fff;
    padding: 30px 28px;
    border-radius: 16px;
    box-shadow: var(--shadow-soft);
    border-top: 4px solid var(--color-accent);
}
.quote-card p { font-size: 15px; line-height: 1.9; color: var(--color-dark-gray); margin-bottom: 16px; }
.quote-card span { font-size: 13px; color: var(--color-accent); font-weight: 700; }

/* ========== CTA ========== */
.cta-band { padding: 84px 0; background: linear-gradient(135deg, var(--color-dark-gray), #3a3a3a); }
.cta-inner {
    display: grid;
    grid-template-columns: .9fr 1.1fr;
    gap: 50px;
    align-items: center;
}
.cta-media img { width: 100%; border-radius: 18px; aspect-ratio: 4/3; object-fit: cover; box-shadow: 0 20px 50px rgba(0,0,0,.35); }
.cta-copy h2 { color: #fff; font-size: 34px; font-weight: 800; margin-bottom: 16px; }
.cta-copy p { color: rgba(255,255,255,.82); font-size: 16px; line-height: 1.9; margin-bottom: 28px; }
.cta-btns { display: flex; gap: 16px; flex-wrap: wrap; }
.btn-ghost { background: transparent; border: 2px solid rgba(255,255,255,.6); color: #fff; }
.btn-ghost:hover { background: rgba(255,255,255,.12); border-color: var(--color-accent); color: var(--color-accent); }

/* ========== 案例卡 ========== */
.case-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 28px; }
.case-card {
    display: block;
    background: #fff;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-soft);
    transition: var(--transition-smooth);
}
.case-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-hover); }
.case-media { position: relative; }
.case-media img { width: 100%; aspect-ratio: 16/10; object-fit: cover; }
.case-tag {
    position: absolute;
    left: 14px; top: 14px;
    background: var(--color-accent);
    color: var(--color-dark-gray);
    font-size: 12px;
    font-weight: 700;
    padding: 4px 12px;
    border-radius: 20px;
}
.case-body { padding: 22px 24px 26px; }
.case-body h4 { font-size: 18px; font-weight: 700; margin-bottom: 10px; color: var(--color-dark-gray); }
.case-body p { font-size: 14px; color: var(--color-medium-gray); line-height: 1.8; margin-bottom: 12px; }
.case-more { font-size: 13px; font-weight: 700; color: var(--color-accent); }

/* ========== 数据条 ========== */
.stat-chips { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 22px; }
.stat-chip { background: #fff; text-align: center; padding: 30px 20px; border-radius: 16px; box-shadow: var(--shadow-soft); }
.stat-chip b { font-size: 34px; font-weight: 800; color: var(--color-accent); display: block; margin-bottom: 6px; }
.stat-chip span { font-size: 14px; color: var(--color-medium-gray); }

/* ========== 文章列表 ========== */
.art-list { max-width: 960px; margin: 0 auto; display: grid; gap: 14px; }
.art-row {
    display: grid;
    grid-template-columns: 1fr 1.4fr auto;
    gap: 20px;
    align-items: center;
    background: #fff;
    padding: 20px 26px;
    border-radius: 14px;
    box-shadow: var(--shadow-soft);
    transition: var(--transition-smooth);
}
.art-row:hover { transform: translateX(6px); box-shadow: var(--shadow-hover); }
.art-title { font-size: 16px; font-weight: 700; color: var(--color-dark-gray); }
.art-desc { font-size: 14px; color: var(--color-medium-gray); line-height: 1.7; }
.art-go { color: var(--color-accent); font-size: 20px; }

/* ========== 页脚微调 ========== */
.footer-about p { line-height: 1.9; }
.footer-contact { display: flex; flex-direction: column; gap: 4px; margin-top: 12px; }
.footer-contact span { color: var(--color-accent); font-size: 14px; }
.footer-note { margin-top: 12px; font-size: 13px; opacity: .7; }
.footer-icp a { color: var(--color-accent); margin-left: 4px; }

/* ========== 模板页（首页/资讯/详情） ========== */
.photo-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.photo-card {
    display: block;
    background: #fff;
    border-radius: 18px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,.07);
    border: 1px solid var(--color-light-gray);
    transition: transform .3s, box-shadow .3s;
    text-decoration: none;
}
.photo-card:hover { transform: translateY(-6px); box-shadow: 0 22px 46px rgba(0,0,0,.13); }
.photo-card img { width: 100%; aspect-ratio: 16/10; object-fit: cover; display: block; }
.photo-card-body { padding: 22px 22px 26px; }
.photo-card-body h3 { font-size: 18px; font-weight: 700; margin-bottom: 10px; color: var(--color-dark-gray); }
.photo-card-body p { font-size: 14px; color: var(--color-medium-gray); line-height: 1.8; }
.tpl-group-title {
    font-size: 18px; font-weight: 700; color: var(--color-dark-gray);
    margin: 40px 0 18px; padding-left: 14px;
    border-left: 4px solid var(--color-accent);
}
.news-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.news-cards .card { margin: 0; }
.btn-ghost {
    background: transparent; border: 2px solid var(--color-accent);
    color: var(--color-accent);
}
.btn-ghost:hover { background: var(--color-accent); color: var(--color-dark-gray); }
.cta-band .btn-ghost { border-color: var(--color-accent); color: var(--color-accent); }
.cta-band .btn-ghost:hover { background: var(--color-accent); color: var(--color-dark-gray); }

/* ========== 响应式 ========== */
@media (max-width: 992px) {
    .sub-hero-grid, .cta-inner { grid-template-columns: 1fr; gap: 36px; }
    .split { grid-template-columns: 1fr; gap: 30px; }
    .split.reverse { direction: ltr; }
    .split.reverse > * { direction: ltr; }
    .nav-menu > li.has-sub.wide .sub-menu { min-width: 0; grid-template-columns: 1fr; }
    .photo-grid, .news-cards { grid-template-columns: repeat(2, 1fr); }
    /* 移动端下拉展开 */
    .nav-menu .sub-menu {
        position: static;
        transform: none;
        opacity: 1;
        visibility: visible;
        box-shadow: none;
        padding: 4px 0 4px 12px;
        border: none;
        display: block;
        min-width: 0;
    }
    .nav-menu .sub-menu a { padding: 9px 12px; white-space: normal; }
    .nav-menu > li.has-sub:hover .sub-menu { transform: none; }
    .nav-menu a .caret { display: none; }
}
@media (max-width: 768px) {
    .section { padding: 56px 0; }
    .sub-hero { padding: 120px 0 46px; }
    .sub-hero-copy h1 { font-size: 32px; }
    .sec-title { font-size: 26px; }
    .art-row { grid-template-columns: 1fr auto; }
    .art-desc { grid-column: 1 / -1; }
    .cta-copy h2 { font-size: 26px; }
    .photo-grid, .news-cards { grid-template-columns: 1fr; }
}