/* ============================================================
   冕锐冶金官网 · 工程图纸 / 明亮科技白 设计体系（共享版）
   与首页 index.html 内联样式同源；内页（About 等）通过此文件复用。
   ============================================================ */
:root {
    --mr-navy: #0B1E3A;
    --mr-steel: #0C4C8D;
    --mr-cyan: #00A8E8;
    --mr-amber: #F59E0B;
    --mr-bg: #F5F8FC;
    --mr-line: #E6EDF5;
    --mr-ink: #102033;
    --mr-mute: #5A6B80;

    --mr-paper: #FBFCFE;
    --mr-paper2: #F2F6FA;
    --mr-line2: #E1E9F2;
    --mr-blueprint: rgba(12, 76, 141, .08);
    --mr-mono: "SF Mono", "Cascadia Mono", "Roboto Mono", ui-monospace, Consolas, "Courier New", monospace;
    --mr-ink-soft: #3A4D63;
}

.mrh-page { font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif; color: var(--mr-ink); background: #fff; overflow-x: hidden; }
.mrh-container { width: min(1200px, calc(100% - 48px)); margin: 0 auto; }
.mrh-kicker { display: inline-block; font-size: 13px; font-weight: 700; letter-spacing: .3em; color: var(--mr-cyan); text-transform: uppercase; margin-bottom: 14px; }
.mrh-h2 { font-size: clamp(26px, 3.2vw, 38px); font-weight: 800; line-height: 1.25; color: var(--mr-navy); margin: 0; }
.mrh-sub { margin-top: 12px; font-size: 15px; line-height: 1.7; color: var(--mr-mute); }

.mrh-sec { padding: 84px 0; }
.mrh-sec.alt { background: var(--mr-paper2); }
.mrh-head { text-align: center; max-width: 760px; margin: 0 auto 48px; }

.mrh-btn { display: inline-flex; align-items: center; gap: 8px; padding: 13px 34px; border-radius: 999px; font-weight: 700; font-size: 15px; text-decoration: none; transition: all .25s ease; border: 1px solid transparent; }
.mrh-btn.primary { background: var(--mr-cyan); color: #fff; }
.mrh-btn.primary:hover { background: var(--mr-steel); color: #fff; }
.mrh-btn.ghost { border-color: rgba(255,255,255,.55); color: #fff; }
.mrh-btn.ghost:hover { background: #fff; color: var(--mr-navy); }
.mrh-btn.dark { border-color: rgba(11,30,58,.30); color: var(--mr-navy); }
.mrh-btn.dark:hover { background: var(--mr-cyan); border-color: var(--mr-cyan); color: #fff; }

.mrh-gridbg { background-image: linear-gradient(var(--mr-blueprint) 1px, transparent 1px), linear-gradient(90deg, var(--mr-blueprint) 1px, transparent 1px); background-size: 46px 46px; }

/* ---------- 版块头：左对齐章节编号 + 标题 ---------- */
.mrh-spec { display: flex; align-items: flex-end; justify-content: space-between; gap: 28px; padding-bottom: 18px; margin-bottom: 46px; border-bottom: 2px solid var(--mr-navy); }
.mrh-spec .idx { font-family: var(--mr-mono); font-size: clamp(46px, 5vw, 72px); font-weight: 800; line-height: .8; letter-spacing: -.02em; color: transparent; -webkit-text-stroke: 1px rgba(12, 76, 141, .35); white-space: nowrap; }
.mrh-spec .cap { min-width: 0; }
.mrh-spec .cap::before { content: ""; display: block; width: 34px; height: 3px; background: var(--mr-amber); margin-bottom: 12px; }
.mrh-spec .cap h3 { margin: 0; font-size: clamp(24px, 3vw, 34px); font-weight: 800; line-height: 1.25; color: var(--mr-navy); }
.mrh-spec .cap .tk { font-family: var(--mr-mono); font-size: 12px; letter-spacing: .3em; text-transform: uppercase; color: var(--mr-cyan); margin-top: 10px; }
.mrh-spec .cap .sub { margin-top: 10px; font-size: 14px; line-height: 1.7; color: var(--mr-mute); max-width: 540px; }
.mrh-spec.r { flex-direction: row-reverse; }
.mrh-spec.r .cap { text-align: right; }
.mrh-spec.r .cap::before { margin-left: auto; }

.mrh-link { display: inline-flex; align-items: center; gap: 8px; font-weight: 700; font-size: 14.5px; line-height: 1.4; color: var(--mr-navy); text-decoration: none; }
.mrh-link::after { content: "→"; color: var(--mr-cyan); transition: transform .25s ease; }
.mrh-link:hover { color: var(--mr-cyan); }
.mrh-link:hover::after { transform: translateX(5px); }

/* ---------- 指标带 ---------- */
.mrh-stats .mrh-stats-bar { display: grid; grid-template-columns: repeat(4, 1fr); border: 1px solid var(--mr-line2); background: #fff; margin-top: -1px; }
.mrh-stats .stat-cell { position: relative; padding: 30px 16px 28px; text-align: center; border-right: 1px solid var(--mr-line2); background: #fff; }
.mrh-stats .stat-cell:last-child { border-right: 0; }
.mrh-stats .stat-cell::before { content: ""; position: absolute; top: 13px; left: 50%; transform: translateX(-50%); width: 5px; height: 5px; border-radius: 50%; background: var(--mr-amber); }
.mrh-stats .stat-cell b { display: block; font-family: var(--mr-mono); font-size: clamp(26px, 2.8vw, 36px); font-weight: 800; line-height: 1.1; color: var(--mr-navy); font-variant-numeric: tabular-nums; }
.mrh-stats .stat-cell b small { font-size: .5em; font-weight: 700; color: var(--mr-cyan); margin-left: 2px; }
.mrh-stats .stat-cell span { display: block; margin-top: 8px; font-family: var(--mr-mono); font-size: 12px; letter-spacing: .16em; text-transform: uppercase; color: var(--mr-mute); }

/* ---------- 关于我们（左右分栏：引述正文 + 实景视觉） ---------- */
.mrh-about { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: 60px; align-items: stretch; }
.mrh-about .about-lede { padding-left: 24px; border-left: 3px solid var(--mr-amber); }
.mrh-about .about-lede .about-copy p { margin: 0 0 16px; font-size: 15px; line-height: 1.95; color: var(--mr-ink-soft); }
.mrh-about .about-lede .about-copy p.lead { font-size: 17px; font-weight: 700; color: var(--mr-navy); }
.mrh-about .about-lede .mrh-chips { margin: 32px 0 28px; }
.mrh-about .about-visual { position: relative; min-width: 0; }
.mrh-about .about-frame { position: relative; height: 100%; }
.mrh-about .about-frame img { width: 100%; height: 100%; aspect-ratio: auto; object-fit: cover; display: block; border: 1px solid var(--mr-line2); background: #EFF4FA; }
.mrh-about .about-frame::before { content: ""; position: absolute; inset: -12px; border: 1px dashed #B9C9DC; z-index: -1; }
.mrh-about .about-frame::after { content: ""; position: absolute; top: -12px; left: -12px; width: 20px; height: 20px; border-top: 3px solid var(--mr-cyan); border-left: 3px solid var(--mr-cyan); }
.mrh-about .about-cap { position: absolute; left: 0; right: 0; bottom: 0; display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 14px 22px; background: linear-gradient(90deg, rgba(9, 31, 60, .85), rgba(9, 31, 60, .62)); border-left: 3px solid var(--mr-amber); }
.mrh-about .about-cap .k { font-family: var(--mr-mono); font-size: 11px; letter-spacing: .22em; text-transform: uppercase; color: #8FD6FF; white-space: nowrap; }
.mrh-about .about-cap .t { font-size: 14.5px; font-weight: 700; color: #fff; text-align: right; line-height: 1.5; }
.mrh-chips { display: flex; flex-wrap: wrap; gap: 10px; }
.mrh-chips span { font-family: var(--mr-mono); font-size: 12.5px; font-weight: 700; color: var(--mr-steel); border: 1px solid rgba(12, 76, 141, .28); background: #F4F9FF; padding: 7px 12px; border-radius: 2px; }

/* ---------- 图片内容版块（图纸画框，内页全宽图转内容版块用） ---------- */
.mrh-imgframe { position: relative; max-width: 1080px; margin: 0 auto; }
.mrh-imgframe .inner { position: relative; border: 1px solid var(--mr-line2); background: var(--mr-paper); }
.mrh-imgframe .inner::before { content: ""; position: absolute; inset: -12px; border: 1px dashed #B9C9DC; z-index: -1; }
.mrh-imgframe .inner::after { content: ""; position: absolute; top: -12px; left: -12px; width: 20px; height: 20px; border-top: 3px solid var(--mr-cyan); border-left: 3px solid var(--mr-cyan); }
.mrh-imgframe img { display: block; width: 100%; height: auto; }

/* ---------- 响应式 ---------- */
@media (max-width: 991px) {
    .mrh-about { grid-template-columns: 1fr; gap: 44px; }
    .mrh-about .about-visual { order: -1; }
    .mrh-about .about-frame { height: auto; }
    .mrh-about .about-frame img { aspect-ratio: 4/3; height: auto; }
}
@media (max-width: 767px) {
    .mrh-sec { padding: 60px 0; }
    .mrh-spec { align-items: flex-start; flex-direction: column; gap: 14px; }
    .mrh-spec.r { flex-direction: column; align-items: flex-start; }
    .mrh-spec.r .cap { text-align: left; }
    .mrh-spec.r .cap::before { margin-left: 0; }
    .mrh-stats .mrh-stats-bar { grid-template-columns: repeat(2, 1fr); }
    .mrh-stats .stat-cell { padding: 24px 12px 26px; }
    .mrh-about .about-lede { padding-left: 16px; }
    .mrh-about .about-cap { left: 0; right: 0; bottom: 0; padding: 12px 16px; flex-direction: column; align-items: flex-start; gap: 5px; }
    .mrh-about .about-cap .t { text-align: left; }
    .mrh-imgframe .inner::before { inset: -8px; }
    .mrh-imgframe .inner::after { top: -8px; left: -8px; }
}