/* =====================================================================
   主题 t12 · 暗黑科技（darkTech）
   设计语言：全暗背景 + 荧光色高亮 + 玻璃态 + 等宽字点缀。
   与现有 t1-t8 显著差异：彻底黑底亮字，靠 accent 荧光色对比突出信息层。
   ===================================================================== */

:root {
    --dt-bg: #05060a;
    --dt-bg-2: #0b0d14;
    --dt-bg-3: #11141d;
    --dt-border: #1c2030;
    --dt-border-2: #252a3a;
    --dt-text: #e5e9f0;
    --dt-text-soft: #94a3b8;
    --dt-accent: #00f5d4;
    --dt-warn: #ff006e;
    --dt-mono: ui-monospace, "SF Mono", Menlo, Consolas, "JetBrains Mono", monospace;
}

body { background: var(--dt-bg); color: var(--dt-text); font-family: var(--dt-font, -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif), "Microsoft YaHei", sans-serif; }
a:hover { color: var(--dt-accent); }

/* 等宽字体应用于所有标签类元素 */
.dt-eyebrow, .dt-hero-title, .dt-section-title em, .dt-prod-id,
.dt-faq-prompt, .dt-cursor, .dt-adv-no, .dt-section-title, .dt-param-table,
.dt-contact-list em, .dt-side-eyebrow, .dt-metric-tag, .dt-metric-value,
.dt-cell-value, .dt-code-block, .dt-pager, .dt-pd-price {
    font-family: var(--dt-mono);
}

/* ============================ 页头 ============================ */
.dt-header {
    position: sticky; top: 0; z-index: 30;
    background: rgba(5, 6, 10, .86);
    backdrop-filter: saturate(1.4) blur(10px);
    border-bottom: 1px solid var(--dt-border);
}
.dt-header-inner { display: flex; align-items: center; gap: 24px; min-height: 72px; }
.dt-brand { display: flex; align-items: center; gap: 12px; color: var(--dt-text); }
.dt-brand-mark {
    width: 14px; height: 14px;
    background: var(--dt-accent);
    box-shadow: 0 0 12px var(--dt-accent);
    border-radius: 2px;
    animation: dt-pulse 2s infinite ease-in-out;
}
@keyframes dt-pulse { 0%, 100% { opacity: 1; } 50% { opacity: .35; } }
.dt-brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.dt-brand-text strong { font-size: 16px; font-weight: 700; }
.dt-brand-text em { font-family: var(--dt-mono); font-size: 11px; color: var(--dt-accent); letter-spacing: 2px; margin-top: 2px; }

.dt-nav { display: flex; gap: 4px; margin-left: auto; }
.dt-nav a {
    padding: 8px 14px;
    font-size: 14px;
    color: var(--dt-text-soft);
    border: 1px solid transparent;
    border-radius: 4px;
    display: flex; align-items: center; gap: 6px;
    transition: color .15s ease, border-color .15s ease, background .15s ease;
}
.dt-nav a span {
    font-family: var(--dt-mono);
    font-size: 10px;
    color: var(--dt-accent);
    opacity: .7;
}
.dt-nav a:hover { color: var(--dt-text); background: var(--dt-bg-2); }
.dt-nav a.is-active {
    color: var(--dt-accent);
    border-color: var(--dt-accent);
    background: rgba(0, 245, 212, .08);
    box-shadow: 0 0 12px rgba(0, 245, 212, .15);
}

.dt-phone {
    display: flex; flex-direction: column; align-items: flex-end;
    padding: 8px 14px;
    border: 1px solid var(--dt-accent);
    border-radius: 4px;
    color: var(--dt-accent);
}
.dt-phone em { font-family: var(--dt-mono); font-size: 10px; letter-spacing: 2px; opacity: .7; }
.dt-phone strong { font-size: 14px; font-weight: 700; }
.dt-phone:hover { background: var(--dt-accent); color: var(--dt-bg); box-shadow: 0 0 16px var(--dt-accent); }

/* 面包屑 */
.dt-crumb { padding: 14px 0; background: var(--dt-bg-2); border-bottom: 1px solid var(--dt-border); font-size: 13px; color: var(--dt-text-soft); font-family: var(--dt-mono); letter-spacing: 1px; }
.dt-crumb .wrap { display: flex; gap: 8px; align-items: center; }
.dt-crumb a { color: var(--dt-accent); }
.dt-crumb i { font-style: normal; opacity: .4; }

/* ============================ Hero ============================ */
.dt-hero {
    position: relative; overflow: hidden;
    padding: 96px 0 80px;
    background: linear-gradient(135deg, var(--dt-bg) 0%, var(--dt-bg-3) 100%);
    border-bottom: 1px solid var(--dt-border);
}
.dt-hero::before {
    content: ""; position: absolute; inset: 0;
    background:
        radial-gradient(900px 600px at 80% 30%, rgba(0, 245, 212, .12), transparent 60%),
        radial-gradient(700px 500px at 20% 80%, rgba(255, 0, 110, .08), transparent 60%);
    pointer-events: none;
}
.dt-hero::after {
    content: ""; position: absolute; inset: 0;
    background-image:
        linear-gradient(rgba(0, 245, 212, .04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 245, 212, .04) 1px, transparent 1px);
    background-size: 48px 48px;
    pointer-events: none;
}
.dt-hero-inner { display: grid; grid-template-columns: 1.3fr 1fr; gap: 48px; align-items: center; position: relative; }
.dt-eyebrow { display: inline-block; padding: 4px 10px; background: rgba(0, 245, 212, .1); border: 1px solid var(--dt-accent); color: var(--dt-accent); border-radius: 2px; font-size: 11px; letter-spacing: 2px; margin-bottom: 24px; }
.dt-hero-title { font-size: clamp(36px, 5vw, 60px); line-height: 1.05; letter-spacing: -1.5px; font-weight: 800; margin: 0 0 18px; }
.dt-hero-desc { color: var(--dt-text-soft); font-size: 16px; max-width: 56ch; margin-bottom: 28px; }
.dt-hero-actions { display: flex; flex-wrap: wrap; gap: 10px; }

/* 右侧数据网格 */
.dt-hero-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.dt-hero-cell {
    padding: 16px 18px;
    background: rgba(11, 13, 20, .8);
    border: 1px solid var(--dt-border-2);
    border-radius: 6px;
    position: relative;
    overflow: hidden;
}
.dt-hero-cell:hover { border-color: var(--dt-accent); box-shadow: 0 0 16px rgba(0, 245, 212, .15); }
.dt-cell-label { display: block; font-family: var(--dt-mono); font-size: 10px; letter-spacing: 2px; color: var(--dt-text-soft); text-transform: uppercase; margin-bottom: 6px; }
.dt-cell-value { display: block; font-family: var(--dt-mono); font-size: 18px; font-weight: 700; color: var(--dt-accent); letter-spacing: 0; margin-bottom: 8px; word-break: break-word; }
.dt-cell-bar { display: block; height: 2px; background: var(--dt-border-2); position: relative; }
.dt-cell-bar::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 60%; background: var(--dt-accent); box-shadow: 0 0 8px var(--dt-accent); animation: dt-bar 2s infinite ease-in-out; }
@keyframes dt-bar { 0%, 100% { width: 60%; } 50% { width: 80%; } }

/* ============================ 按钮 ============================ */
.dt-btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 6px;
    min-height: 44px; padding: 0 22px;
    border: 1px solid transparent; border-radius: 4px;
    font-family: var(--dt-mono);
    font-size: 13px; font-weight: 600; letter-spacing: 1px;
    cursor: pointer;
    transition: transform .15s ease, box-shadow .18s ease, background .18s ease, color .18s ease;
}
.dt-btn:hover { transform: translateY(-1px); }
.dt-btn-primary {
    background: var(--dt-accent); color: var(--dt-bg);
    border-color: var(--dt-accent);
}
.dt-btn-primary:hover { box-shadow: 0 0 24px var(--dt-accent); }
.dt-btn-outline {
    border-color: var(--dt-border-2); color: var(--dt-text);
    background: transparent;
}
.dt-btn-outline:hover { border-color: var(--dt-accent); color: var(--dt-accent); box-shadow: 0 0 12px rgba(0, 245, 212, .25); }
.dt-btn-block { width: 100%; margin-top: 8px; }

/* ============================ 通用节区 ============================ */
.dt-section { padding: calc(80px * var(--site-density)) 0; border-bottom: 1px solid var(--dt-border); }
.dt-section-alt { background: var(--dt-bg-2); }
.dt-section-head { display: flex; justify-content: space-between; align-items: baseline; flex-wrap: wrap; gap: 14px; margin-bottom: 28px; }
.dt-section-title { display: flex; flex-wrap: wrap; align-items: baseline; gap: 12px; margin: 0 0 28px; font-size: 16px; }
.dt-section-title em { font-style: normal; color: var(--dt-text); }
.dt-section-title span { font-family: var(--dt-mono); font-size: 11px; color: var(--dt-text-soft); letter-spacing: 2px; }
.dt-section-title em::before { content: "$ "; color: var(--dt-accent); }
.dt-link-more { font-family: var(--dt-mono); font-size: 12px; color: var(--dt-accent); letter-spacing: 1px; }
.dt-link-more:hover { text-decoration: underline; }
.dt-more { display: inline-block; margin-top: 28px; font-family: var(--dt-mono); font-size: 13px; color: var(--dt-accent); letter-spacing: 1px; }
.dt-more:hover { text-decoration: underline; }

/* ============================ 指标 ============================ */
.dt-metrics { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1px; background: var(--dt-border-2); border: 1px solid var(--dt-border-2); border-radius: 6px; overflow: hidden; }
.dt-metric { padding: 22px 24px; background: var(--dt-bg-2); transition: background .15s ease; }
.dt-metric:hover { background: var(--dt-bg-3); }
.dt-metric-tag { display: inline-block; padding: 2px 8px; background: var(--dt-bg); border: 1px solid var(--dt-accent); color: var(--dt-accent); font-size: 11px; letter-spacing: 2px; border-radius: 2px; margin-bottom: 12px; }
.dt-metric-value { display: block; font-size: 26px; font-weight: 800; letter-spacing: -0.5px; color: var(--dt-text); margin-bottom: 6px; }
.dt-metric-label { font-family: var(--dt-mono); font-size: 12px; color: var(--dt-text-soft); letter-spacing: 1px; }

/* ============================ 产品 ============================ */
.dt-products { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.dt-prod-card {
    background: var(--dt-bg-2);
    border: 1px solid var(--dt-border-2);
    border-radius: 6px;
    overflow: hidden;
    transition: border-color .15s ease, box-shadow .18s ease, transform .15s ease;
}
.dt-prod-card:hover { border-color: var(--dt-accent); box-shadow: 0 0 24px rgba(0, 245, 212, .18); transform: translateY(-2px); }
.dt-prod-thumb {
    position: relative; display: block;
    aspect-ratio: 4 / 3;
    background: linear-gradient(135deg, var(--dt-bg-3), var(--dt-bg-2));
    border-bottom: 1px solid var(--dt-border-2);
}
.dt-prod-thumb img { width: 100%; height: 100%; object-fit: cover; filter: brightness(0.85); }
.dt-prod-ph { display: flex; align-items: center; justify-content: center; width: 100%; height: 100%; color: var(--dt-accent); font-family: var(--dt-mono); font-size: 16px; }
.dt-prod-id { position: absolute; top: 10px; left: 10px; padding: 2px 8px; background: var(--dt-bg); border: 1px solid var(--dt-accent); color: var(--dt-accent); font-size: 11px; border-radius: 2px; }
.dt-prod-body { padding: 16px 18px; }
.dt-prod-body h3 { font-size: 15px; margin-bottom: 8px; }
.dt-prod-body h3 a { color: var(--dt-text); }
.dt-prod-body h3 a:hover { color: var(--dt-accent); }
.dt-prod-body p { font-size: 13px; color: var(--dt-text-soft); margin-bottom: 10px; }
.dt-prod-foot { display: flex; justify-content: space-between; align-items: center; padding-top: 10px; border-top: 1px dashed var(--dt-border-2); font-family: var(--dt-mono); font-size: 12px; }
.dt-prod-foot span { color: var(--dt-accent); }
.dt-prod-foot a { color: var(--dt-text-soft); }
.dt-prod-foot a:hover { color: var(--dt-accent); }

/* 产品详情 */
.dt-pd-wrap { display: grid; grid-template-columns: 1.1fr 1fr; gap: 40px; align-items: start; }
.dt-pd-gallery .dt-pd-main { aspect-ratio: 4 / 3; border: 1px solid var(--dt-accent); border-radius: 6px; overflow: hidden; background: var(--dt-bg-2); display: flex; align-items: center; justify-content: center; }
.dt-pd-gallery .dt-pd-main img { width: 100%; height: 100%; object-fit: cover; }
.dt-pd-thumbs { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-top: 10px; }
.dt-pd-thumbs img { width: 100%; aspect-ratio: 1 / 1; object-fit: cover; border-radius: 4px; cursor: pointer; border: 1px solid var(--dt-border-2); }
.dt-pd-info h1 { font-size: clamp(28px, 3vw, 42px); margin: 0 0 14px; letter-spacing: -1px; }
.dt-pd-sub { font-family: var(--dt-mono); font-size: 12px; color: var(--dt-accent); letter-spacing: 2px; margin-bottom: 18px; }
.dt-pd-sum { font-size: 15px; color: var(--dt-text-soft); margin-bottom: 18px; line-height: 1.7; }
.dt-pd-price { color: var(--dt-accent); font-size: 22px; margin-bottom: 18px; letter-spacing: 0; }
.dt-pd-tags { display: flex; flex-wrap: wrap; gap: 6px; padding: 0; margin: 0 0 24px; list-style: none; }
.dt-pd-tags li { padding: 3px 10px; background: var(--dt-bg-2); border: 1px solid var(--dt-border-2); border-radius: 2px; font-size: 11px; color: var(--dt-text-soft); font-family: var(--dt-mono); }
.dt-pd-badges { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 22px; padding-top: 18px; border-top: 1px solid var(--dt-border-2); font-family: var(--dt-mono); font-size: 11px; color: var(--dt-text-soft); }
.dt-pd-badges span { padding: 3px 10px; background: var(--dt-bg-2); border: 1px solid var(--dt-border-2); border-radius: 2px; }

/* 参数表 */
.dt-param-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.dt-param-table th { width: 180px; padding: 12px 14px; background: var(--dt-bg-2); text-align: left; font-weight: 600; color: var(--dt-accent); border: 1px solid var(--dt-border-2); font-size: 13px; letter-spacing: 1px; }
.dt-param-table td { padding: 12px 14px; border: 1px solid var(--dt-border-2); color: var(--dt-text); }

/* ============================ 优势 ============================ */
.dt-adv-list { display: grid; gap: 8px; padding: 0; margin: 0; list-style: none; }
.dt-adv-item {
    display: grid; grid-template-columns: 60px 1fr 2fr; gap: 24px;
    padding: 20px 24px;
    background: var(--dt-bg-2);
    border: 1px solid var(--dt-border-2);
    border-radius: 6px;
    align-items: center;
    transition: border-color .15s ease;
}
.dt-adv-item:hover { border-color: var(--dt-accent); }
.dt-adv-no { font-size: 20px; color: var(--dt-accent); font-weight: 700; }
.dt-adv-item h3 { font-size: 16px; margin: 0; }
.dt-adv-item p { margin: 0; font-size: 13px; color: var(--dt-text-soft); }

/* 关于 */
.dt-about-grid { display: grid; grid-template-columns: 1fr 2fr; gap: 40px; align-items: start; }
.dt-about-aside { position: sticky; top: 100px; }
.dt-code-block {
    background: var(--dt-bg-2); border: 1px solid var(--dt-border-2);
    border-left: 3px solid var(--dt-accent);
    padding: 18px; border-radius: 4px;
    color: var(--dt-text-soft); font-size: 12px; line-height: 1.6;
    white-space: pre-wrap; word-break: break-word;
    margin: 0 0 18px;
}
.dt-about-body { font-size: 15px; line-height: 1.85; }

/* ============================ FAQ ============================ */
.dt-faq-list { display: grid; gap: 8px; }
.dt-faq-item {
    padding: 16px 20px;
    background: var(--dt-bg-2);
    border: 1px solid var(--dt-border-2);
    border-radius: 4px;
}
.dt-faq-item summary { cursor: pointer; display: flex; align-items: center; gap: 8px; list-style: none; }
.dt-faq-item summary::-webkit-details-marker { display: none; }
.dt-faq-prompt { color: var(--dt-accent); font-family: var(--dt-mono); font-size: 14px; }
.dt-faq-item summary em { margin-left: auto; font-family: var(--dt-mono); font-size: 18px; color: var(--dt-accent); transition: transform .18s ease; }
.dt-faq-item[open] summary em { transform: rotate(45deg); }
.dt-faq-item p { margin: 10px 0 0 18px; color: var(--dt-text-soft); font-size: 13px; }

/* ============================ 新闻 feed ============================ */
.dt-news-feed { display: grid; gap: 4px; padding: 0; margin: 0; list-style: none; }
.dt-news-feed-lg .dt-news-item { padding: 20px 18px; }
.dt-news-item {
    display: grid; grid-template-columns: auto 1fr auto; grid-template-areas: "time title cat" "time sum sum";
    gap: 6px 18px;
    padding: 16px 18px;
    background: var(--dt-bg-2);
    border: 1px solid var(--dt-border-2);
    border-left: 2px solid var(--dt-accent);
    border-radius: 4px;
    transition: border-color .15s ease, background .15s ease;
}
.dt-news-item:hover { background: var(--dt-bg-3); }
.dt-news-time { grid-area: time; font-family: var(--dt-mono); font-size: 11px; color: var(--dt-accent); letter-spacing: 1px; padding: 2px 8px; background: var(--dt-bg); border-radius: 2px; }
.dt-news-title { grid-area: title; font-size: 15px; font-weight: 600; }
.dt-news-title:hover { color: var(--dt-accent); }
.dt-news-cat { grid-area: cat; font-family: var(--dt-mono); font-size: 11px; color: var(--dt-accent); letter-spacing: 1px; }
.dt-news-sum { grid-area: sum; margin: 0; font-size: 13px; color: var(--dt-text-soft); }
.dt-news-feed-lg .dt-news-title { font-size: 17px; }

/* ============================ 筛选 / 分页 ============================ */
.dt-filter { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 24px; }
.dt-filter-item { padding: 5px 14px; border: 1px solid var(--dt-border-2); border-radius: 2px; font-family: var(--dt-mono); font-size: 12px; color: var(--dt-text-soft); letter-spacing: 1px; }
.dt-filter-item:hover { border-color: var(--dt-accent); color: var(--dt-accent); }
.dt-filter-item.is-active { background: var(--dt-accent); color: var(--dt-bg); border-color: var(--dt-accent); }

.dt-pager { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; padding: 28px 0 0; align-items: center; }
.dt-pg-btn, .dt-pg-num {
    display: inline-flex; align-items: center; justify-content: center;
    min-width: 36px; height: 36px; padding: 0 12px;
    border: 1px solid var(--dt-border-2); border-radius: 2px;
    font-size: 12px; color: var(--dt-text-soft);
}
.dt-pg-num.is-active { background: var(--dt-accent); color: var(--dt-bg); border-color: var(--dt-accent); }
.dt-pg-total { font-size: 11px; color: var(--dt-text-soft); padding-left: 8px; letter-spacing: 1px; }

/* ============================ 列表头 ============================ */
.dt-page-head { padding: 88px 0 56px; background: var(--dt-bg-2); border-bottom: 1px solid var(--dt-border); position: relative; overflow: hidden; }
.dt-page-head::before { content: ""; position: absolute; inset: 0; background-image: linear-gradient(rgba(0, 245, 212, .04) 1px, transparent 1px), linear-gradient(90deg, rgba(0, 245, 212, .04) 1px, transparent 1px); background-size: 48px 48px; pointer-events: none; }
.dt-page-head .wrap { position: relative; }
.dt-page-head h1 { font-size: clamp(34px, 4vw, 52px); font-weight: 800; margin: 8px 0 12px; letter-spacing: -1px; }
.dt-page-head p { color: var(--dt-text-soft); font-family: var(--dt-mono); font-size: 13px; letter-spacing: 1px; }

/* ============================ 文章 ============================ */
.dt-article-wrap { display: grid; grid-template-columns: 1fr 320px; gap: 40px; align-items: start; }
.dt-article { font-size: 15px; line-height: 1.85; }
.dt-article-title { font-size: clamp(26px, 3vw, 38px); margin-bottom: 18px; letter-spacing: -1px; }
.dt-article-meta { display: flex; flex-wrap: wrap; gap: 10px; padding: 14px 0; border-top: 1px solid var(--dt-border-2); border-bottom: 1px solid var(--dt-border-2); margin-bottom: 22px; font-family: var(--dt-mono); font-size: 11px; color: var(--dt-text-soft); letter-spacing: 1px; }
.dt-article-lead { font-size: 16px; color: var(--dt-text-soft); margin-bottom: 22px; padding-left: 14px; border-left: 2px solid var(--dt-accent); }
.dt-article-figure { margin: 0 0 24px; border-radius: 4px; overflow: hidden; border: 1px solid var(--dt-border-2); }
.dt-article-figure img { width: 100%; height: auto; }
.dt-article-tags { display: flex; flex-wrap: wrap; gap: 6px; padding: 18px 0 0; margin-top: 22px; border-top: 1px solid var(--dt-border-2); align-items: center; }
.dt-article-tags em { font-family: var(--dt-mono); font-size: 11px; color: var(--dt-text-soft); }
.dt-article-tags span { font-family: var(--dt-mono); font-size: 11px; padding: 3px 10px; background: var(--dt-bg-2); border: 1px solid var(--dt-border-2); border-radius: 2px; color: var(--dt-accent); }
.dt-article-block { margin-top: 32px; }
.dt-article-block h2 { font-size: 20px; margin-bottom: 14px; color: var(--dt-accent); }
.dt-prev-next { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 28px; padding-top: 20px; border-top: 1px solid var(--dt-border-2); font-size: 13px; }
.dt-prev-next a:hover { color: var(--dt-accent); }

/* 侧栏 */
.dt-side { display: grid; gap: 14px; position: sticky; top: 100px; }
.dt-side-card { background: var(--dt-bg-2); border: 1px solid var(--dt-border-2); border-radius: 6px; padding: 20px 22px; }
.dt-side-card h4 { font-size: 12px; letter-spacing: 2px; color: var(--dt-text-soft); margin: 0 0 12px; font-family: var(--dt-mono); }
.dt-side-card ul { padding: 0; margin: 0; list-style: none; }
.dt-side-card li { padding: 6px 0; border-bottom: 1px dashed var(--dt-border-2); display: flex; justify-content: space-between; gap: 8px; font-size: 13px; }
.dt-side-card li:last-child { border-bottom: 0; }
.dt-side-card li em { font-family: var(--dt-mono); color: var(--dt-accent); font-size: 11px; }
.dt-side-card p { font-size: 13px; color: var(--dt-text-soft); margin: 0 0 6px; }
.dt-side-eyebrow { font-family: var(--dt-mono); font-size: 11px; letter-spacing: 2px; color: var(--dt-accent) !important; }
.dt-side-phone { color: var(--dt-accent) !important; font-size: 22px !important; font-weight: 800; margin-bottom: 12px !important; font-family: var(--dt-mono); letter-spacing: 0; }

/* 联系方式 */
.dt-contact-wrap { display: grid; grid-template-columns: 1fr 1.2fr; gap: 40px; align-items: start; }
.dt-contact-list { padding: 0; margin: 0 0 24px; list-style: none; }
.dt-contact-list li {
    display: grid; grid-template-columns: 120px 1fr; gap: 18px;
    padding: 16px 0;
    border-bottom: 1px solid var(--dt-border-2);
    align-items: baseline;
}
.dt-contact-list li:last-child { border-bottom: 0; }
.dt-contact-list li em { color: var(--dt-accent); font-size: 12px; letter-spacing: 2px; }
.dt-contact-list li a, .dt-contact-list li span { font-size: 15px; color: var(--dt-text); }

/* 留言表单 */
.dt-message-box { background: var(--dt-bg-2); border: 1px solid var(--dt-accent); border-radius: 6px; padding: 36px 36px; box-shadow: 0 0 24px rgba(0, 245, 212, .12); }
.dt-message-box h2 { font-size: 22px; margin-bottom: 8px; color: var(--dt-accent); }
.dt-message-box > p { color: var(--dt-text-soft); margin-bottom: 22px; font-size: 13px; }
.dt-form-row { margin-bottom: 14px; }
.dt-form-row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.dt-form-row label { display: block; font-family: var(--dt-mono); font-size: 11px; letter-spacing: 2px; color: var(--dt-text-soft); margin-bottom: 4px; }
.dt-form-row label i { color: var(--dt-warn); font-style: normal; }
.dt-form-row input, .dt-form-row textarea {
    width: 100%; padding: 10px 12px;
    background: var(--dt-bg);
    border: 1px solid var(--dt-border-2); border-radius: 2px;
    color: var(--dt-text); font-size: 14px;
    font-family: inherit;
    outline: none;
    transition: border-color .15s ease, box-shadow .15s ease;
}
.dt-form-row input:focus, .dt-form-row textarea:focus { border-color: var(--dt-accent); box-shadow: 0 0 8px rgba(0, 245, 212, .25); }
.dt-form-row textarea { resize: vertical; min-height: 110px; }
.dt-form-row input::placeholder, .dt-form-row textarea::placeholder { color: var(--dt-text-soft); opacity: .5; }
.dt-message-result { margin: 10px 0 0; font-family: var(--dt-mono); font-size: 12px; min-height: 1.4em; letter-spacing: 1px; }
.dt-message-result.is-error { color: var(--dt-warn); }
.dt-message-result.is-ok { color: var(--dt-accent); }

/* 兄弟站点 */
.dt-region-grid { display: flex; flex-wrap: wrap; gap: 6px; }
.dt-region-grid a { padding: 5px 12px; border: 1px solid var(--dt-border-2); border-radius: 2px; font-family: var(--dt-mono); font-size: 11px; color: var(--dt-text-soft); letter-spacing: 1px; }
.dt-region-grid a:hover { background: var(--dt-accent); color: var(--dt-bg); border-color: var(--dt-accent); }
.dt-region-grid-sm a { font-size: 11px; padding: 4px 10px; }
.dt-region-list { columns: 2; column-gap: 16px; padding: 0; margin: 0; list-style: none; }
.dt-region-list li { break-inside: avoid; }
.dt-region-list a { display: block; padding: 4px 0; font-family: var(--dt-mono); font-size: 12px; color: var(--dt-text-soft); }
.dt-region-list a:hover { color: var(--dt-accent); }

/* 空态 */
.dt-empty { padding: 60px 20px; text-align: center; color: var(--dt-text-soft); background: var(--dt-bg-2); border: 1px dashed var(--dt-border-2); border-radius: 4px; font-family: var(--dt-mono); font-size: 13px; letter-spacing: 1px; }

/* ============================ CTA ============================ */
.dt-section-cta { background: var(--dt-bg-3); border-bottom-color: var(--dt-accent); }
.dt-section-cta .dt-cta-inner { text-align: center; max-width: 60ch; margin: 0 auto; }
.dt-section-cta h2 { font-size: clamp(24px, 3vw, 36px); margin: 8px 0 12px; letter-spacing: 0; color: var(--dt-accent); font-family: var(--dt-mono); }
.dt-section-cta p { color: var(--dt-text-soft); margin-bottom: 24px; font-size: 14px; }
.dt-section-cta .dt-hero-actions { justify-content: center; margin-bottom: 0; }
.dt-section-cta-sm { padding: calc(56px * var(--site-density)) 0; }

/* ============================ 页脚 ============================ */
.dt-footer { background: var(--dt-bg); border-top: 1px solid var(--dt-border); padding: calc(64px * var(--site-density)) 0 24px; }
.dt-footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1.2fr 1.4fr; gap: 36px; padding-bottom: 36px; border-bottom: 1px solid var(--dt-border); }
.dt-footer-brand { display: flex; flex-direction: column; gap: 12px; }
.dt-footer-brand h3 { font-size: 16px; font-weight: 700; margin: 0; }
.dt-footer-status { font-family: var(--dt-mono); font-size: 11px; color: var(--dt-accent); letter-spacing: 1px; margin: 0; display: flex; align-items: center; gap: 8px; }
.dt-footer-status i { width: 8px; height: 8px; background: var(--dt-accent); border-radius: 50%; box-shadow: 0 0 8px var(--dt-accent); animation: dt-pulse 2s infinite ease-in-out; }
.dt-footer h4 { font-family: var(--dt-mono); font-size: 11px; letter-spacing: 2px; color: var(--dt-accent); margin: 0 0 14px; }
.dt-footer p, .dt-footer a { display: block; font-size: 13px; color: var(--dt-text-soft); margin: 0 0 6px; font-family: var(--dt-mono); }
.dt-footer a:hover { color: var(--dt-accent); }
.dt-footer-bottom { display: flex; flex-wrap: wrap; gap: 18px; padding-top: 20px; font-family: var(--dt-mono); font-size: 11px; color: var(--dt-text-soft); letter-spacing: 1px; }
.dt-footer-bottom a { display: inline; color: inherit; }
.dt-footer-bottom a:hover { color: var(--dt-accent); }
.dt-cursor { display: inline-block; color: var(--dt-accent); animation: dt-blink 1s infinite step-end; }
@keyframes dt-blink { 0%, 50% { opacity: 1; } 51%, 100% { opacity: 0; } }

/* ============================ 404 ============================ */
.dt-band-404 { padding: calc(120px * var(--site-density)) 0; text-align: center; }
.dt-404-code {
    font-family: var(--dt-mono); font-size: clamp(120px, 16vw, 220px);
    font-weight: 800; line-height: 1; letter-spacing: -6px;
    color: transparent;
    -webkit-text-stroke: 1px var(--dt-accent);
    text-shadow: 0 0 24px rgba(0, 245, 212, .4);
    margin-bottom: 16px;
}
.dt-band-404 h1 { font-family: var(--dt-mono); font-size: 22px; margin-bottom: 10px; color: var(--dt-accent); }
.dt-404-desc { color: var(--dt-text-soft); margin-bottom: 24px; }
.dt-404 .dt-hero-actions { justify-content: center; margin-bottom: 32px; }
.dt-404-links p { font-family: var(--dt-mono); font-size: 11px; letter-spacing: 2px; color: var(--dt-accent); margin-bottom: 14px; }
.dt-404-links .dt-region-grid { justify-content: center; }

/* ============================ 响应式 ============================ */
@media (max-width: 1024px) {
    .dt-hero-inner, .dt-pd-wrap, .dt-about-grid, .dt-contact-wrap { grid-template-columns: 1fr; gap: 32px; }
    .dt-products { grid-template-columns: repeat(2, 1fr); }
    .dt-article-wrap { grid-template-columns: 1fr; gap: 32px; }
    .dt-side, .dt-about-aside { position: static; }
    .dt-footer-grid { grid-template-columns: 1fr 1fr; }
    .dt-adv-item { grid-template-columns: 40px 1fr 1.6fr; gap: 16px; }
}
@media (max-width: 720px) {
    .dt-products { grid-template-columns: 1fr; }
    .dt-hero-grid { grid-template-columns: 1fr; }
    .dt-nav a span { display: none; }
    .dt-nav { gap: 2px; }
    .dt-nav a { padding: 6px 10px; font-size: 13px; }
    .dt-form-row-2 { grid-template-columns: 1fr; }
    .dt-message-box { padding: 24px; }
    .dt-news-item { grid-template-columns: 1fr; grid-template-areas: "time" "title" "cat" "sum"; gap: 4px; }
    .dt-footer-grid { grid-template-columns: 1fr; }
    .dt-contact-list li { grid-template-columns: 90px 1fr; }
    .dt-region-list { columns: 1; }
    .dt-phone { display: none; }
    .dt-adv-item { grid-template-columns: 40px 1fr; }
    .dt-adv-item p { grid-column: 1 / -1; }
}