.openpit-page {
  --op-blue: #1567e7;
  --op-ink: #0d1b2f;
  --op-muted: #617088;
  --op-width: 1440px;
  margin: 0;
  color: var(--op-ink);
  background: #fff;
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
}

.openpit-page .fh-header { position: sticky; }
.openpit-page *, .openpit-page *::before, .openpit-page *::after { box-sizing: border-box; }
.openpit-page main { overflow: hidden; }
.op-section-tab { position: absolute; z-index: 75; top: 0; left: max(24px, calc((100vw - 1440px) / 2 - 200px)); width: max-content; padding: 8px 0; border: 1px solid #e5edf6; border-radius: 6px; background: rgba(255,255,255,.96); box-shadow: 0 12px 28px rgba(16,48,92,.12); }
.op-section-tab a, .op-section-tab button { position: relative; display: flex; align-items: center; min-height: 38px; padding: 0 16px; border: 0; color: #445166; background: transparent; cursor: pointer; font: 14px/20px "PingFang SC", "Microsoft YaHei", sans-serif; text-align: left; text-decoration: none; white-space: nowrap; }
.op-section-tab a::before { content: ""; position: absolute; top: 7px; bottom: 7px; left: 0; width: 2px; background: transparent; }
.op-section-tab a:hover, .op-section-tab a:focus-visible, .op-section-tab a.is-active { color: #005dbe; font-weight: 600; }
.op-section-tab a.is-active::before { background: #005dbe; }
.op-section-tab button { margin-top: 4px; padding-top: 8px; border-top: 1px solid #e5edf6; color: #005dbe; font-weight: 600; }
.op-section-tab button::after { content: ""; width: 6px; height: 6px; margin-left: 7px; border-top: 1.5px solid currentColor; border-left: 1.5px solid currentColor; transform: rotate(45deg); }
.op-wrap { width: min(var(--op-width), calc(100% - 48px)); margin: 0 auto; }
.op-section-title { display: flex; align-items: center; gap: 10px; margin: 0; line-height: 45px; }
.op-section-title span { color: var(--op-blue); font-size: 32px; font-weight: 600; }
.op-section-title strong { color: #4a4a4a; font-size: 30px; font-weight: 400; }

.op-hero { position: relative; height: 550px; overflow: hidden; background: #76c4f2; }
.op-hero-base, .op-hero-mine { position: absolute; pointer-events: none; }
.op-hero-base { inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: center top; }
.op-hero-mine { left: 0; right: 0; bottom: -4px; width: 100%; height: auto; min-height: 100%; object-fit: cover; object-position: center bottom; }
.op-hero::after { display: none; }
.op-hero-copy { position: absolute; width: 1px; height: 1px; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); clip-path: inset(50%); white-space: nowrap; }
.op-hero h1 { margin: 0; color: #111; font-size: 40px; font-weight: 700; line-height: 1.4; }
.op-hero p { width: min(1120px, 100%); margin: 12px auto 0; color: #222; font-size: 18px; line-height: 34px; }

.op-challenges { position: relative; height: 606px; padding-top: 70px; background: #fff; }
.op-challenges::before { content: ""; position: absolute; inset: 0; background: url("../resources/image/theme/figma-openpit/layers/challenge-section-bg.png") center / cover no-repeat; }
.op-challenges .op-wrap { position: relative; }
.op-challenge-grid { display: grid; grid-template-columns: repeat(4, 1fr); margin-top: 50px; height: 419px; }
.op-challenge-card { --challenge-bg-position: 0% center; position: relative; display: flex; flex-direction: column; padding: 46px 60px 26px; overflow: hidden; border-radius: 0; outline: 0; background: transparent; transition: color .28s ease, border-radius .28s ease, box-shadow .28s ease; }
.op-challenge-card:nth-child(2) { --challenge-bg-position: 33.333% center; }
.op-challenge-card:nth-child(3) { --challenge-bg-position: 66.667% center; }
.op-challenge-card:nth-child(4) { --challenge-bg-position: 100% center; }
.op-challenge-card::before { content: ""; position: absolute; inset: 0; background: url("../resources/image/theme/figma-openpit/layers/challenge-photo.png") var(--challenge-bg-position) / auto 100% no-repeat; opacity: 0; transform: scale(1.025); transition: opacity .3s ease, transform .55s ease; }
.op-challenge-card::after { content: ""; position: absolute; inset: 0; background: rgba(2,18,36,.58); opacity: 0; transition: opacity .3s ease; }
.op-challenge-grid:not(:hover) .op-challenge-card:focus-visible,
.op-challenge-card:hover { border-radius: 12px; color: #fff; box-shadow: 0 18px 38px rgba(0,72,147,.18); }
.op-challenge-grid:not(:hover) .op-challenge-card:focus-visible::before,
.op-challenge-card:hover::before { opacity: 1; transform: scale(1); }
.op-challenge-grid:not(:hover) .op-challenge-card:focus-visible::after,
.op-challenge-card:hover::after { opacity: 1; }
.op-challenge-card > * { position: relative; z-index: 1; }
.op-challenge-icon-pair { position: relative; width: 90px; height: 90px; flex: 0 0 90px; }
.op-challenge-icon { position: absolute; inset: 0; width: 90px; height: 90px; object-fit: contain; transition: opacity .28s ease; }
.op-challenge-icon.is-white { opacity: 0; }
.op-challenge-grid:not(:hover) .op-challenge-card:focus-visible .op-challenge-icon,
.op-challenge-card:hover .op-challenge-icon { opacity: 0; }
.op-challenge-grid:not(:hover) .op-challenge-card:focus-visible .op-challenge-icon.is-white,
.op-challenge-card:hover .op-challenge-icon.is-white { opacity: 1; }
.op-challenge-card h3 { height: 56px; margin: 25px 0 0; font-size: 20px; font-weight: 600; line-height: 28px; }
.op-challenge-card hr { display: block; width: 100%; min-height: 1px; height: 1px; margin: 25px 0 19px; padding: 0; border: 0; border-top: 1px solid #cbd8e8; opacity: 1; background: #cbd8e8; visibility: visible; transition: border-color .28s ease, background-color .28s ease; }
.op-challenge-card p { margin: 0; color: var(--op-muted); font-size: 14px; line-height: 25px; text-align: justify; transition: color .28s ease; }
.op-challenge-grid:not(:hover) .op-challenge-card:focus-visible hr,
.op-challenge-card:hover hr { border-color: rgba(255,255,255,.55); background: rgba(255,255,255,.55); }
.op-challenge-grid:not(:hover) .op-challenge-card:focus-visible p,
.op-challenge-card:hover p { color: #fff; }

.op-overview { padding: 70px 0 0; background: #fff; }
.op-overview-text { margin-top: 41px; color: #1a1a1a; font-size: 18px; line-height: 34px; }
.op-overview-text p { margin: 0; text-indent: 2em; }
.op-overview-text p + p { margin-top: 0; }
.op-overview-panel { position: relative; display: grid; grid-template-columns: 1fr 1fr; gap: 60px; height: 448px; margin-top: 41px; padding: 48px 54px 48px 60px; overflow: hidden; border-radius: 12px; background: #1469d7; color: #fff; }
.op-overview-panel::before { content: ""; position: absolute; inset: 0; background: url("../resources/image/theme/figma-openpit/layers/overview-panel-bg-new.png") center / cover no-repeat; }
.op-overview-copy, .op-overview-carousel { position: relative; z-index: 1; }
.op-overview-copy { display: block; }
.op-overview-copy-head { position: absolute; right: 0; bottom: 0; left: 0; display: flex; align-items: center; justify-content: space-between; min-height: 48px; }
.op-overview-copy h3 { margin: 0; font-size: 34px; line-height: 48px; font-weight: 500; }
.op-overview-controls { display: flex; align-items: center; gap: 16px; }
.op-overview-control { width: 40px; height: 40px; padding: 0; border: 0; background: transparent; cursor: pointer; }
.op-overview-control img { display: block; width: 40px; height: 40px; }
.op-overview-control .is-active { display: none; }
.op-overview-control:hover .is-default,
.op-overview-control:focus-visible .is-default { display: none; }
.op-overview-control:hover .is-active,
.op-overview-control:focus-visible .is-active { display: block; }
.op-overview-control:focus-visible { outline: 2px solid #fff; outline-offset: 3px; border-radius: 50%; }
.op-overview-copy p { position: absolute; top: 0; right: 0; left: 0; margin: 0; font-size: 20px; line-height: 40px; text-align: justify; }
.op-overview-carousel { height: 352px; overflow: hidden; border-radius: 8px; }
.op-overview-track { display: flex; width: 200%; height: 100%; transition: transform .45s ease; }
.op-overview-track[data-page="business"] { transform: translateX(-50%); }
.op-mine-grid { display: grid; flex: 0 0 50%; grid-template-columns: repeat(12,1fr); grid-template-rows: repeat(2,176px); overflow: hidden; border-radius: 8px; background: rgba(228,238,251,.85); }
.op-mine-item { display: flex; flex-direction: column; align-items: flex-start; justify-content: space-between; padding: 30px 32px; border: 1px solid rgba(255,255,255,.12); }
.op-mine-grid--mine .op-mine-item:nth-child(1), .op-mine-grid--mine .op-mine-item:nth-child(2) { grid-column: span 6; }
.op-mine-grid--mine .op-mine-item:nth-child(n+3) { grid-column: span 4; }
.op-mine-item.business-top { grid-column: span 4; }
.op-mine-item.business-bottom { grid-column: span 3; }
.op-mine-item img { width: 50px; height: 50px; object-fit: contain; }
.op-mine-item span { margin: 0; color: #000; font-size: 20px; line-height: 28px; white-space: nowrap; }

.op-panorama { padding: 50px 0 70px; background: #fff; }
.op-panorama .op-wrap { overflow: hidden; }
.op-panorama-visual { width: min(1100px, 100%); margin: 0 auto; overflow: hidden; border-radius: 16px; cursor: zoom-in; }
.op-panorama img { display: block; width: 100%; height: auto; object-fit: contain; transform: scale(1); transform-origin: center; transition: transform .45s ease, filter .45s ease; }
.op-panorama-visual:hover img, .op-panorama-visual:focus-visible img { filter: drop-shadow(0 14px 22px rgba(25,93,181,.2)); transform: scale(1.035); }
.op-panorama-visual:focus-visible { outline: 2px solid var(--op-blue); outline-offset: 4px; }

.op-value { height: 559px; padding-top: 70px; background: #fff; }
.op-value-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 30px 35px; height: 430px; margin-top: 34px; }
.op-value-card { box-sizing: border-box; display: flex; align-items: center; justify-content: center; gap: 30px; height: 200px; min-width: 0; padding: 25px; overflow: hidden; border: 0; border-radius: 12px; background: #fff; box-shadow: 0 0 25px rgba(0,72,147,.15); }
.op-value-content { flex: 1 0 0; min-width: 0; }
.op-value-content-header { display: flex; align-items: center; gap: 15px; color: #1a1a1a; white-space: nowrap; }
.op-value-content strong { font-size: 30px; line-height: normal; font-weight: 600; }
.op-value-content h3 { margin: 0; font-size: 16px; line-height: normal; font-weight: 400; }
.op-value-content p { margin: 10px 0 0; color: #617088; font-size: 16px; line-height: 28.8px; }
.op-value-image-frame { position: relative; flex: 0 0 261px; width: 261px; height: 168px; overflow: hidden; border-radius: 10px; }
.op-value-media { position: absolute; display: block; max-width: none; pointer-events: none; }
.op-value-card.is-low-grade .op-value-media { top: -41px; right: 0; width: 314px; height: 252px; object-fit: cover; }
.op-value-card.is-dilution .op-value-media { top: -16px; left: -50px; width: 324px; height: 200px; object-fit: cover; transform: scaleX(-1); }
.op-value-card.is-loss .op-value-media { top: -8px; left: -23px; width: 306px; height: 184px; object-fit: cover; }
.op-value-card.is-cost .op-value-media { top: -14px; right: -5px; width: 267px; height: 214px; object-fit: cover; }

.op-cases { padding: 70px 0 40px; background: #fff; }
.op-case-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 40px; margin-top: 45px; }
.op-case-card { overflow: hidden; height: 624px; border-radius: 12px; background: #fff; box-shadow: 0 0 25px rgba(0,72,147,.15); }
.op-case-visual { position: relative; height: 400px; overflow: hidden; background: #061428; }
.op-case-visual > img { width: 100%; height: 100%; object-fit: cover; transition: transform .35s ease; }
.op-case-overlay { position: absolute; inset: 0; display: flex; flex-direction: column; justify-content: flex-end; padding: 30px; color: #fff; background: rgba(0,0,0,.3); opacity: 0; transform: translateY(14px); pointer-events: none; transition: opacity .3s ease, transform .3s ease; }
.op-case-card:hover .op-case-visual > img, .op-case-card:focus-within .op-case-visual > img { transform: scale(1.04); }
.op-case-card:hover .op-case-overlay, .op-case-card:focus-within .op-case-overlay { opacity: 1; transform: translateY(0); pointer-events: auto; }
.op-case-overlay p { margin: 0 0 18px; font-size: 16px; line-height: 29px; }
.op-case-tags { display: grid; grid-template-columns: repeat(3,1fr); gap: 20px; }
.op-case-tags span { height: 37px; display: flex; align-items: center; justify-content: center; border-radius: 6px; background: rgba(83,143,216,.62); font-size: 12px; }
.op-case-body { padding: 25px 40px; }
.op-case-body h3 { margin: 0 0 19px; font-size: 28px; line-height: 39px; font-weight: 600; }
.op-case-stats { display: grid; grid-template-columns: repeat(2,1fr); gap: 15px; }
.op-case-stat { height: 48px; display: flex; align-items: center; padding: 0 30px; border-radius: 6px; background: #f7f8fa; font-size: 16px; font-weight: 600; white-space: nowrap; cursor: default; transition: background-color .22s ease, box-shadow .22s ease, transform .22s ease; }
.op-case-stat img { width: 36px; height: 36px; margin-right: 10px; object-fit: contain; transition: transform .22s ease; }
.op-case-stat:hover { background: #edf6ff; box-shadow: 0 8px 18px rgba(0,93,190,.12); transform: translateY(-3px); }
.op-case-stat:hover img { transform: scale(1.1); }

.op-more { display: flex; flex-direction: column; overflow: hidden; padding: 0; color: #fff; background: #0564c9 url("../resources/image/theme/openpit-more-bg-frame127.png") center/cover no-repeat; }
.op-more-cta { margin: 40px 0; text-align: center; }
.op-more-cta h2 { margin: 0; font-size: 40px; line-height: 56px; font-weight: 600; }
.op-more-cta p { margin: 16px 0 30px; font-size: 18px; line-height: 25px; }
.op-more-cta a { width: 192px; height: 44px; display: inline-flex; align-items: center; justify-content: center; border-radius: 6px; background: #fff; color: #005dbe; font-size: 16px; text-decoration: none; transition: transform .2s ease, background-color .2s ease, color .2s ease, box-shadow .2s ease; }
.op-more-cta a:hover, .op-more-cta a:focus-visible { background: #fff; color: #005dbe; box-shadow: 0 10px 22px rgba(0, 40, 99, .3); transform: translateY(-3px) scale(1.025); }
.op-more-cta a:focus-visible { outline: 2px solid #fff; outline-offset: 4px; }
.op-more-clients { order: -1; margin: 0; padding: 40px 0; background: #fff; }
.op-more-viewport { width: min(1705px, calc(100vw - 64px)); margin: 0 auto; overflow: hidden; }
.op-cases .op-more-clients { width: 100vw; margin: 40px 0 0 calc(50% - 50vw); padding: 0; }
.op-cases .op-more-viewport { width: calc(100vw - 64px); }
.op-more-track { display: flex; width: max-content; animation: op-client-marquee 32s linear infinite; }
.op-more-group { display: flex; gap: 30px; padding-right: 30px; }
.op-more-card { width: 317px; height: 190px; flex: 0 0 317px; padding: 22px 24px; border-radius: 12px; background: #f7f8fa; color: #0d1b2f; text-align: center; }
.op-more-logo { height: 65px; display: flex; align-items: center; justify-content: center; }
.op-more-logo img { max-width: 180px; max-height: 60px; object-fit: contain; }
.op-more-card h3 { margin: 12px 0 7px; font-size: 18px; line-height: 25px; }
.op-more-card p { margin: 0; color: #617088; font-size: 12px; line-height: 20px; }
.op-more-clients:hover .op-more-track { animation-play-state: paused; }
@keyframes op-client-marquee { to { transform: translateX(-50%); } }

.openpit-page .compact-footer { min-height: 61px; padding: 0; display: flex; align-items: center; background: #f3f4f6; }
.openpit-page .compact-footer .copyright { color: #777e8a; font-size: 12px; text-align: center; }

@media (max-width: 1500px) {
  .op-wrap { width: min(var(--op-width), calc(100% - 64px)); }
  .op-value-grid { gap: 24px; }
  .op-case-stat { padding: 0 18px; }
}

@media (min-width: 1101px) and (max-width: 1700px) {
  .op-section-tab { width: 42px; min-height: 139px; padding: 12px 0; display: flex; flex-direction: column; align-items: center; justify-content: center; overflow: hidden; border: 0; border-radius: 21px; background: #0b5ed7; box-shadow: 0 12px 28px rgba(0, 72, 147, .2); transition: width .2s ease, border-radius .2s ease, background-color .2s ease; }
  .op-section-tab::before { content: "页面导航"; color: #fff; font: 400 13px/1.3 "PingFang SC", "Microsoft YaHei", sans-serif; writing-mode: vertical-rl; letter-spacing: 1px; }
  .op-section-tab::after { content: ""; width: 7px; height: 7px; margin-top: 10px; border-top: 2px solid #fff; border-right: 2px solid #fff; transform: rotate(45deg); }
  .op-section-tab a, .op-section-tab button { display: none; }
  .op-section-tab:hover, .op-section-tab:focus-within { width: 132px; min-height: 0; padding: 8px 0; align-items: stretch; border: 1px solid #e5edf6; border-radius: 6px; background: rgba(255,255,255,.96); }
  .op-section-tab:hover::before, .op-section-tab:hover::after, .op-section-tab:focus-within::before, .op-section-tab:focus-within::after { display: none; }
  .op-section-tab:hover a, .op-section-tab:hover button, .op-section-tab:focus-within a, .op-section-tab:focus-within button { display: flex; }
}

@media (max-width: 1100px) {
  .openpit-page .fh-nav { display: none; }
  .op-section-tab { display: none; }
  .op-challenges, .op-overview, .op-panorama, .op-value, .op-cases, .op-more { height: auto; }
  .op-challenges, .op-overview, .op-panorama, .op-value, .op-cases { padding: 56px 0; }
  .op-challenge-grid { grid-template-columns: repeat(2,1fr); height: auto; gap: 20px; }
  .op-challenge-card { min-height: 420px; }
  .op-overview-panel { height: auto; grid-template-columns: 1fr; }
  .op-overview-copy { min-height: 260px; }
  .op-panorama img { height: auto; }
  .op-value { height: auto; padding-bottom: 50px; }
  .op-value-grid { grid-template-columns: 1fr; height: auto; }
  .op-value-card { height: 200px; }
  .op-case-grid { grid-template-columns: 1fr; }
  .op-case-card { max-width: 700px; width: 100%; margin: 0 auto; }
  .op-more { padding: 56px 0 50px; }
}

@media (max-width: 640px) {
  .op-wrap { width: calc(100% - 32px); }
  .openpit-page .fh-header-inner { width: calc(100% - 32px); }
  .openpit-page .fh-search { display: none; }
  .op-section-title { align-items: baseline; gap: 8px; line-height: 1.25; }
  .op-section-title span { font-size: 22px; }
  .op-section-title strong { font-size: 21px; }
  .op-hero { height: 550px; }
  .op-hero-mine { width: auto; max-width: none; height: 100%; left: 50%; transform: translateX(-50%); }
  .op-hero-copy { padding-top: 44px; }
  .op-hero h1 { font-size: 28px; }
  .op-hero p { margin-top: 12px; font-size: 15px; line-height: 27px; }
  .op-challenge-grid { grid-template-columns: 1fr; margin-top: 32px; }
  .op-challenge-card { min-height: 390px; padding: 50px 42px; }
  .op-overview-panel { margin-top: 30px; padding: 34px 24px; gap: 30px; }
  .op-overview-copy { display: flex; flex-direction: column; min-height: 300px; justify-content: space-between; }
  .op-overview-copy-head, .op-overview-copy p { position: static; }
  .op-overview-copy h3 { font-size: 27px; }
  .op-overview-copy p { font-size: 16px; line-height: 30px; }
  .op-overview-carousel { height: auto; }
  .op-overview-track { height: auto; }
  .op-mine-grid { grid-template-columns: 1fr 1fr; grid-template-rows: none; }
  .op-mine-item, .op-mine-item:nth-child(n) { grid-column: span 1; min-height: 140px; padding: 24px 18px; }
  .op-mine-grid--mine .op-mine-item:last-child { grid-column: 1 / -1; }
  .op-mine-item span { font-size: 16px; white-space: normal; }
  .op-panorama img { margin-top: 28px; }
  .op-value-grid { grid-template-columns: 1fr; margin-top: 32px; }
  .op-value-card, .op-value-card.is-featured { gap: 16px; height: 200px; padding: 20px; }
  .op-value-content { width: auto; }
  .op-value-content strong { font-size: 24px; }
  .op-value-content h3 { font-size: 14px; }
  .op-value-content p { font-size: 13px; line-height: 1.6; }
  .op-value-image-frame { flex: 0 1 38%; width: 38%; height: auto; aspect-ratio: 261 / 168; }
  .op-case-grid { margin-top: 32px; }
  .op-case-card { height: auto; }
  .op-case-visual { height: 300px; }
  .op-case-overlay { inset: 0; padding: 20px; }
  .op-case-overlay p { font-size: 13px; line-height: 22px; }
  .op-case-tags { gap: 8px; }
  .op-case-tags span { padding: 0 6px; font-size: 10px; text-align: center; }
  .op-case-body { padding: 22px 20px 26px; }
  .op-case-body h3 { font-size: 23px; }
  .op-case-stats { grid-template-columns: 1fr; }
  .op-case-stat { width: 100%; }
  .op-more-cta { padding: 0 20px; }
  .op-more-cta h2 { font-size: 30px; }
  .op-more-cta p { font-size: 15px; line-height: 24px; }
}

@media (prefers-reduced-motion: reduce) { .op-more-track { animation: none; } }

/* v17: centered solution headings and unnumbered value cards. */
.op-section-title {
  display: block;
  margin: 0;
  color: #1a1a1a;
  font-size: 29px;
  font-weight: 700;
  line-height: 1.1;
  text-align: center;
}
.op-section-title strong {
  color: #1a1a1a;
  font-size: 29px;
  font-weight: 700;
}
.op-section-title::after {
  content: "";
  display: block;
  width: 40px;
  height: 2px;
  margin: 16px auto 0;
  background: #1d5dbf;
}
.op-value-content h3 {
  margin: 0;
  font-size: 18px;
  line-height: normal;
  font-weight: 600;
}
@media (max-width: 860px){
  .op-section-title {
    line-height: 1.25;
  }
  .op-section-title strong {
    font-size: 21px;
  }
}

/* v18 solution layout and content. */
.openpit-page {
  --op-blue: #1567e7;
  --op-ink: #0d1b2f;
  --op-muted: #617088;
  --op-width: 1440px;
  margin: 0;
  color: var(--op-ink);
  background: #fff;
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
}

.openpit-page .fh-header { position: sticky; }
.openpit-page *, .openpit-page *::before, .openpit-page *::after { box-sizing: border-box; }
.openpit-page main { overflow: hidden; }
.op-section-tab { position: absolute; z-index: 75; top: 0; left: max(24px, calc((100vw - 1440px) / 2 - 200px)); width: max-content; padding: 8px 0; border: 1px solid #e5edf6; border-radius: 6px; background: rgba(255,255,255,.96); box-shadow: 0 12px 28px rgba(16,48,92,.12); }
.op-section-tab a, .op-section-tab button { position: relative; display: flex; align-items: center; min-height: 38px; padding: 0 16px; border: 0; color: #445166; background: transparent; cursor: pointer; font: 14px/20px "PingFang SC", "Microsoft YaHei", sans-serif; text-align: left; text-decoration: none; white-space: nowrap; }
.op-section-tab a::before { content: ""; position: absolute; top: 7px; bottom: 7px; left: 0; width: 2px; background: transparent; }
.op-section-tab a:hover, .op-section-tab a:focus-visible, .op-section-tab a.is-active { color: #005dbe; font-weight: 600; }
.op-section-tab a.is-active::before { background: #005dbe; }
.op-section-tab button { margin-top: 4px; padding-top: 8px; border-top: 1px solid #e5edf6; color: #005dbe; font-weight: 600; }
.op-section-tab button::after { content: ""; width: 6px; height: 6px; margin-left: 7px; border-top: 1.5px solid currentColor; border-left: 1.5px solid currentColor; transform: rotate(45deg); }
.op-wrap { width: min(var(--op-width), calc(100% - 48px)); margin: 0 auto; }
.op-section-title { display: block; margin: 0; color: #1a1a1a; font-size: 32px; font-weight: 700; line-height: 1.1; text-align: center; }
.op-section-title strong { color: #1a1a1a; font-size: 32px; font-weight: 700; }
.op-section-title::after { content: ""; display: block; width: 40px; height: 2px; margin: 16px auto 0; background: #1d5dbf; }

.op-hero { position: relative; height: 550px; overflow: hidden; background: #76c4f2; }
.op-hero-base, .op-hero-mine { position: absolute; pointer-events: none; }
.op-hero-base { inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: center top; }
.op-hero-mine { left: 0; right: 0; bottom: -4px; width: 100%; height: auto; min-height: 100%; object-fit: cover; object-position: center bottom; }
.op-hero::after { display: none; }
.op-hero-copy { position: absolute; width: 1px; height: 1px; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); clip-path: inset(50%); white-space: nowrap; }
.op-hero h1 { margin: 0; color: #111; font-size: 40px; font-weight: 700; line-height: 1.4; }
.op-hero p { width: min(1120px, 100%); margin: 12px auto 0; color: #222; font-size: 18px; line-height: 34px; }

.op-challenges { position: relative; padding-top: 70px; background: #fff; }
.op-challenges::before { content: ""; position: absolute; inset: 0; background: url("../resources/image/theme/figma-openpit/layers/challenge-section-bg.png") center / cover no-repeat; }
.op-challenges .op-wrap { position: relative; }
.op-challenge-grid { display: grid; grid-auto-flow: row; grid-auto-columns: auto; grid-template-columns: repeat(3, minmax(0, 1fr)); margin-top: 50px; height: auto; }
.op-challenge-card { --challenge-bg-position: 0% center; position: relative; display: flex; flex-direction: column; padding:0px 36px; overflow: hidden; border-radius: 0; outline: 0; background: transparent; transition: color .28s ease, border-radius .28s ease, box-shadow .28s ease; }
.op-challenge-card:nth-child(2) { --challenge-bg-position: 33.333% center; }
.op-challenge-card:nth-child(3) { --challenge-bg-position: 66.667% center; }
.op-challenge-card:nth-child(4) { --challenge-bg-position: 100% center; }
.op-challenge-card::before { content: ""; position: absolute; inset: 0; background: url("../resources/image/theme/figma-openpit/layers/challenge-photo.png") var(--challenge-bg-position) / auto 100% no-repeat; opacity: 0; transform: scale(1.025); transition: opacity .3s ease, transform .55s ease; }
.op-challenge-card::after { content: ""; position: absolute; inset: 0; background: rgba(2,18,36,.58); opacity: 0; transition: opacity .3s ease; }
.op-challenge-grid:not(:hover) .op-challenge-card:focus-visible,
.op-challenge-card:hover { border-radius: 12px; color: #fff; box-shadow: 0 18px 38px rgba(0,72,147,.18); }
.op-challenge-grid:not(:hover) .op-challenge-card:focus-visible::before,
.op-challenge-card:hover::before { opacity: 1; transform: scale(1); }
.op-challenge-grid:not(:hover) .op-challenge-card:focus-visible::after,
.op-challenge-card:hover::after { opacity: 1; }
.op-challenge-card > * { position: relative; z-index: 1; }
.op-challenge-icon-pair { position: relative; width: 90px; height: 90px; flex: 0 0 90px; }
.op-challenge-icon { position: absolute; inset: 0; width: 90px; height: 90px; object-fit: contain; transition: opacity .28s ease; }
.op-challenge-icon.is-white { opacity: 0; }
.op-challenge-grid:not(:hover) .op-challenge-card:focus-visible .op-challenge-icon,
.op-challenge-card:hover .op-challenge-icon { opacity: 0; }
.op-challenge-grid:not(:hover) .op-challenge-card:focus-visible .op-challenge-icon.is-white,
.op-challenge-card:hover .op-challenge-icon.is-white { opacity: 1; }
.op-challenge-card h3 { height: auto; margin: 25px 0 0; font-size: 20px; font-weight: 600; line-height: 28px; }
.op-challenge-card hr { display: block; width: 100%; min-height: 1px; height: 1px; margin: 25px 0 19px; padding: 0; border: 0; border-top: 1px solid #cbd8e8; opacity: 1; background: #cbd8e8; visibility: visible; transition: border-color .28s ease, background-color .28s ease; }
.op-challenge-card p { margin: 0; color: var(--op-muted); font-size: 16px; line-height: 29px; text-align: justify; transition: color .28s ease; }
.op-challenge-grid:not(:hover) .op-challenge-card:focus-visible hr,
.op-challenge-card:hover hr { border-color: rgba(255,255,255,.55); background: rgba(255,255,255,.55); }
.op-challenge-grid:not(:hover) .op-challenge-card:focus-visible p,
.op-challenge-card:hover p { color: #fff; }

/* 宽屏下卡片最小高度，保证一行内卡片等高 */
@media (min-width: 1101px) {
  .op-challenge-card { min-height: 300px; }
}

/* 运营难点卡片样式：白底圆角卡片，保留 hover / focus 时的配图效果 */
.op-challenges--cards { padding-bottom: 60px; }
.op-challenges--cards .op-challenge-grid { gap: 24px; }
.op-challenges--cards .op-challenge-card { padding: 32px 28px; border-radius: 12px; background: #fff; box-shadow: 0 0 25px rgba(0,72,147,.15); }
.op-challenges--cards .op-challenge-card h3 { margin-top: 0; }

.op-overview { padding: 70px 0 0; background: #fff; }
.op-overview-text { margin-top: 41px; color: #1a1a1a; font-size: 16px; line-height: 39px; }
.op-overview-text p { margin: 0; text-indent: 2em; }
.op-overview-text p + p { margin-top: 0; }
.op-overview-panel { position: relative; display: grid; grid-template-columns: 1fr 1fr; gap: 60px; height: 448px; margin-top: 41px; padding: 48px 54px 48px 60px; overflow: hidden; border-radius: 12px; background: #1469d7; color: #fff; }
.op-overview-panel::before { content: ""; position: absolute; inset: 0; background: url("../resources/image/theme/figma-openpit/layers/overview-panel-bg-new.png") center / cover no-repeat; }
.op-overview-copy, .op-overview-carousel { position: relative; z-index: 1; }
.op-overview-copy { display: block; }
.op-overview-copy-head { position: absolute; right: 0; bottom: 0; left: 0; display: flex; align-items: center; justify-content: space-between; min-height: 48px; }
.op-overview-copy h3 { margin: 0; font-size: 34px; line-height: 48px; font-weight: 500; }
.op-overview-controls { display: flex; align-items: center; gap: 16px; }
.op-overview-control { width: 40px; height: 40px; padding: 0; border: 0; background: transparent; cursor: pointer; }
.op-overview-control img { display: block; width: 40px; height: 40px; }
.op-overview-control .is-active { display: none; }
.op-overview-control:hover .is-default,
.op-overview-control:focus-visible .is-default { display: none; }
.op-overview-control:hover .is-active,
.op-overview-control:focus-visible .is-active { display: block; }
.op-overview-control:focus-visible { outline: 2px solid #fff; outline-offset: 3px; border-radius: 50%; }
.op-overview-copy p { position: absolute; top: 0; right: 0; left: 0; margin: 0; font-size: 20px; line-height: 40px; text-align: justify; }
.op-overview-carousel { height: 352px; overflow: hidden; border-radius: 8px; }
.op-overview-track { display: flex; width: 200%; height: 100%; transition: transform .45s ease; }
.op-overview-track[data-page="business"] { transform: translateX(-50%); }
.op-mine-grid { display: grid; flex: 0 0 50%; grid-template-columns: repeat(12,1fr); grid-template-rows: repeat(2,176px); overflow: hidden; border-radius: 8px; background: rgba(228,238,251,.85); }
.op-mine-item { display: flex; flex-direction: column; align-items: flex-start; justify-content: space-between; padding: 30px 32px; border: 1px solid rgba(255,255,255,.12); }
.op-mine-grid--mine .op-mine-item:nth-child(1), .op-mine-grid--mine .op-mine-item:nth-child(2) { grid-column: span 6; }
.op-mine-grid--mine .op-mine-item:nth-child(n+3) { grid-column: span 4; }
.op-mine-item.business-top { grid-column: span 4; }
.op-mine-item.business-bottom { grid-column: span 3; }
.op-mine-item img { width: 50px; height: 50px; object-fit: contain; }
.op-mine-item span { margin: 0; color: #000; font-size: 20px; line-height: 28px; white-space: nowrap; }

.op-panorama { padding: 50px 0 70px; background: #fff; }
.op-panorama .op-wrap { overflow: hidden; }
.op-panorama-visual { width: min(1100px, 100%); margin: 0 auto; overflow: hidden; border-radius: 16px; cursor: zoom-in; }
.op-panorama img { display: block; width: 100%; height: auto; object-fit: contain; transform: scale(1); transform-origin: center; transition: transform .45s ease, filter .45s ease; }
.op-panorama-visual:hover img, .op-panorama-visual:focus-visible img { filter: drop-shadow(0 14px 22px rgba(25,93,181,.2)); transform: scale(1.035); }
.op-panorama-visual:focus-visible { outline: 2px solid var(--op-blue); outline-offset: 4px; }

.op-value { height: 559px; padding-top: 70px; background: #fff; }
.op-value-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 30px 35px; height: 430px; margin-top: 34px; }
.op-value-card { box-sizing: border-box; display: flex; align-items: center; justify-content: center; gap: 30px; height: 200px; min-width: 0; padding: 25px; overflow: hidden; border: 0; border-radius: 12px; background: #fff; box-shadow: 0 0 25px rgba(0,72,147,.15); }
.op-value-content { flex: 1 0 0; min-width: 0; }
.op-value-content-header { display: flex; align-items: center; gap: 15px; color: #1a1a1a; white-space: nowrap; }
.op-value-content strong { font-size: 30px; line-height: normal; font-weight: 600; }
.op-value-content h3 { margin: 0; font-size: 18px; line-height: normal; font-weight: 600; }
.op-value-content p { margin: 10px 0 0; color: #617088; font-size: 16px; line-height: 28.8px; }
.op-value-image-frame { position: relative; flex: 0 0 261px; width: 261px; height: 168px; overflow: hidden; border-radius: 10px; }
.op-value-media { position: absolute; display: block; max-width: none; pointer-events: none; }
.op-value-card.is-low-grade .op-value-media { top: -41px; right: 0; width: 314px; height: 252px; object-fit: cover; }
.op-value-card.is-dilution .op-value-media { top: -16px; left: -50px; width: 324px; height: 200px; object-fit: cover; transform: scaleX(-1); }
.op-value-card.is-loss .op-value-media { top: -8px; left: -23px; width: 306px; height: 184px; object-fit: cover; }
.op-value-card.is-cost .op-value-media { top: -14px; right: -5px; width: 267px; height: 214px; object-fit: cover; }

.op-cases { padding: 70px 0 40px; background: #fff; }
.op-case-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 40px; margin-top: 45px; }
.op-case-card { overflow: hidden; height: 624px; border-radius: 12px; background: #fff; box-shadow: 0 0 25px rgba(0,72,147,.15); }
.op-case-visual { position: relative; height: 400px; overflow: hidden; background: #061428; }
.op-case-visual > img { width: 100%; height: 100%; object-fit: cover; transition: transform .35s ease; }
.op-case-overlay { position: absolute; inset: 0; display: flex; flex-direction: column; justify-content: flex-end; padding: 30px; color: #fff; background: rgba(0,0,0,.3); opacity: 0; transform: translateY(14px); pointer-events: none; transition: opacity .3s ease, transform .3s ease; }
.op-case-card:hover .op-case-visual > img, .op-case-card:focus-within .op-case-visual > img { transform: scale(1.04); }
.op-case-card:hover .op-case-overlay, .op-case-card:focus-within .op-case-overlay { opacity: 1; transform: translateY(0); pointer-events: auto; }.op-case-overlay p { margin: 0 0 18px; font-size: 16px; line-height: 29px; }
.op-case-tags { display: grid; grid-template-columns: repeat(3,1fr); gap: 20px; }
.op-case-tags span { height: 37px; display: flex; align-items: center; justify-content: center; border-radius: 6px; background: rgba(83,143,216,.62); font-size: 12px; }
.op-case-body { padding: 25px 40px; }
.op-case-body h3 { margin: 0 0 19px; font-size: 23px; line-height: 35px; font-weight: 600;padding-left: 10px; }
.op-case-stats { display: grid; grid-template-columns: repeat(2,1fr); gap: 15px; }
.op-case-stat { height: 48px; display: flex; align-items: center; padding-left:20px; border-radius: 6px; background: #f7f8fa; font-size: 16px; font-weight: 600; white-space: nowrap; cursor: default; transition: background-color .22s ease, box-shadow .22s ease, transform .22s ease; }
.op-case-stat img { width: 36px; height: 36px; margin-right: 10px; object-fit: contain; transition: transform .22s ease; }
.op-case-stat:hover { background: #edf6ff; box-shadow: 0 8px 18px rgba(0,93,190,.12); transform: translateY(-3px); }
.op-case-stat:hover img { transform: scale(1.1); }

.op-more { display: flex; flex-direction: column; overflow: hidden; padding: 0; color: #fff; background: #0564c9 url("../resources/image/theme/openpit-more-bg-frame127.png") center/cover no-repeat; }
.op-more-cta { margin: 40px 0; text-align: center; }
.op-more-cta h2 { margin: 0; font-size: 40px; line-height: 56px; font-weight: 600; }
.op-more-cta p { margin: 16px 0 30px; font-size: 18px; line-height: 25px; }
.op-more-cta a { width: 192px; height: 44px; display: inline-flex; align-items: center; justify-content: center; border-radius: 6px; background: #fff; color: #005dbe; font-size: 16px; text-decoration: none; transition: transform .2s ease, background-color .2s ease, color .2s ease, box-shadow .2s ease; }
.op-more-cta a:hover, .op-more-cta a:focus-visible { background: #fff; color: #005dbe; box-shadow: 0 10px 22px rgba(0, 40, 99, .3); transform: translateY(-3px) scale(1.025); }
.op-more-cta a:focus-visible { outline: 2px solid #fff; outline-offset: 4px; }
.op-more-clients { order: -1; margin: 0; padding: 40px 0; background: #fff; }
.op-more-viewport { width: min(1705px, calc(100vw - 64px)); margin: 0 auto; overflow: hidden; }
.op-cases .op-more-clients { width: 100vw; margin: 70px 0 0 calc(50% - 50vw); padding: 0; }
.op-cases .op-more-viewport { width: calc(100vw - 64px); }
.op-more-track { display: flex; width: max-content; animation: op-client-marquee 32s linear infinite; }
.op-more-group { display: flex; gap: 30px; padding-right: 30px; }
.op-more-card { width: 317px; height: 130px; flex: 0 0 317px; padding: 18px; border-radius: 12px; background: #f7f8fa; color: #0d1b2f; text-align: center; }
.op-more-logo { height: 60px; display: flex; align-items: center; justify-content: center; }
.op-more-logo img { max-width: 180px; max-height: 60px; object-fit: contain; }
.op-more-card h3 { margin: 7px 0px; font-size: 16px; line-height: 25px; }
.op-more-card p { margin: 0; color: #617088; font-size: 12px; line-height: 20px; }
.op-more-clients:hover .op-more-track { animation-play-state: paused; }
@keyframes op-client-marquee { to { transform: translateX(-50%); } }

.openpit-page .compact-footer { min-height: 61px; padding: 0; display: flex; align-items: center; background: #f3f4f6; }
.openpit-page .compact-footer .copyright { color: #777e8a; font-size: 12px; text-align: center; }

@media (max-width: 1500px) {
  .op-wrap { width: min(var(--op-width), calc(100% - 64px)); }
  .op-value-grid { gap: 24px; }
  .op-case-stat { padding: 0 18px; }
}

@media (min-width: 1101px) and (max-width: 1700px) {
  .op-section-tab { width: 42px; min-height: 139px; padding: 12px 0; display: flex; flex-direction: column; align-items: center; justify-content: center; overflow: hidden; border: 0; border-radius: 21px; background: #0b5ed7; box-shadow: 0 12px 28px rgba(0, 72, 147, .2); transition: width .2s ease, border-radius .2s ease, background-color .2s ease; }
  .op-section-tab::before { content: "页面导航"; color: #fff; font: 400 13px/1.3 "PingFang SC", "Microsoft YaHei", sans-serif; writing-mode: vertical-rl; letter-spacing: 1px; }
  .op-section-tab::after { content: ""; width: 7px; height: 7px; margin-top: 10px; border-top: 2px solid #fff; border-right: 2px solid #fff; transform: rotate(45deg); }
  .op-section-tab a, .op-section-tab button { display: none; }
  .op-section-tab:hover, .op-section-tab:focus-within { width: 132px; min-height: 0; padding: 8px 0; align-items: stretch; border: 1px solid #e5edf6; border-radius: 6px; background: rgba(255,255,255,.96); }
  .op-section-tab:hover::before, .op-section-tab:hover::after, .op-section-tab:focus-within::before, .op-section-tab:focus-within::after { display: none; }
  .op-section-tab:hover a, .op-section-tab:hover button, .op-section-tab:focus-within a, .op-section-tab:focus-within button { display: flex; }
}

@media (max-width: 1100px) {
  .openpit-page .fh-nav { display: none; }
  .op-section-tab { display: none; }
  .op-challenges, .op-overview, .op-panorama, .op-value, .op-cases, .op-more { height: auto; }
  .op-challenges, .op-overview, .op-panorama, .op-value, .op-cases { padding: 56px 0; }
  .op-challenge-grid { grid-auto-flow: row; grid-auto-columns: auto; grid-template-columns: repeat(2,1fr); height: auto; gap: 20px; }
  .op-challenge-card { min-height: 420px; }
  .op-overview-panel { height: auto; grid-template-columns: 1fr; }
  .op-overview-copy { min-height: 260px; }
  .op-panorama img { height: auto; }
  .op-value { height: auto; padding-bottom: 50px; }
  .op-value-grid { grid-template-columns: 1fr; height: auto; }
  .op-value-card { height: 200px; }
  .op-case-grid { grid-template-columns: 1fr; }
  .op-case-card { max-width: 700px; width: 100%; margin: 0 auto; }
  .op-more { padding: 56px 0 50px; }
}

@media (max-width: 640px) {
  .op-wrap { width: calc(100% - 32px); }
  .openpit-page .fh-header-inner { width: calc(100% - 32px); }
  .openpit-page .fh-search { display: none; }
  .op-section-title { line-height: 1.25; }
  .op-section-title strong { font-size: 21px; }
  .op-hero { height: 550px; }
  .op-hero-mine { width: auto; max-width: none; height: 100%; left: 50%; transform: translateX(-50%); }
  .op-hero-copy { padding-top: 44px; }
  .op-hero h1 { font-size: 28px; }
  .op-hero p { margin-top: 12px; font-size: 15px; line-height: 27px; }
  .op-challenge-grid { grid-template-columns: 1fr; margin-top: 32px; }
  .op-challenge-card { min-height: 390px; padding: 50px 42px; }
  .op-overview-panel { margin-top: 30px; padding: 34px 24px; gap: 30px; }
  .op-overview-copy { display: flex; flex-direction: column; min-height: 300px; justify-content: space-between; }
  .op-overview-copy-head, .op-overview-copy p { position: static; }
  .op-overview-copy h3 { font-size: 27px; }
  .op-overview-copy p { font-size: 16px; line-height: 30px; }
  .op-overview-carousel { height: auto; }
  .op-overview-track { height: auto; }
  .op-mine-grid { grid-template-columns: 1fr 1fr; grid-template-rows: none; }
  .op-mine-item, .op-mine-item:nth-child(n) { grid-column: span 1; min-height: 140px; padding: 24px 18px; }
  .op-mine-grid--mine .op-mine-item:last-child { grid-column: 1 / -1; }
  .op-mine-item span { font-size: 16px; white-space: normal; }
  .op-panorama img { margin-top: 28px; }
  .op-value-grid { grid-template-columns: 1fr; margin-top: 32px; }
  .op-value-card, .op-value-card.is-featured { gap: 16px; height: 200px; padding: 20px; }
  .op-value-content { width: auto; }
  .op-value-content strong { font-size: 24px; }
  .op-value-content h3 { font-size: 14px; }
  .op-value-content p { font-size: 13px; line-height: 1.6; }
  .op-value-image-frame { flex: 0 1 38%; width: 38%; height: auto; aspect-ratio: 261 / 168; }
  .op-case-grid { margin-top: 32px; }
  .op-case-card { height: auto; }
  .op-case-visual { height: 300px; }
  .op-case-overlay { inset: 0; padding: 20px; }
  .op-case-overlay p { font-size: 13px; line-height: 22px; }
  .op-case-tags { gap: 8px; }
  .op-case-tags span { padding: 0 6px; font-size: 10px; text-align: center; }
  .op-case-body { padding: 22px 20px 26px; }
  .op-case-body h3 { font-size: 23px }
  .op-case-stats { grid-template-columns: 1fr; }
  .op-case-stat { width: 100%; }
  .op-more-cta { padding: 0 20px; }
  .op-more-cta h2 { font-size: 30px; }
  .op-more-cta p { font-size: 15px; line-height: 24px; }
}

@media (prefers-reduced-motion: reduce) { .op-more-track { animation: none; } }