/* S51 报告厅和会议系统：HPC 深色、克制、可交接的中文页面。 */
.s51-auditorium-cn {
	--s51-bg: #05080d;
	--s51-panel: #0b1924;
	--s51-panel-2: #0d2230;
	--s51-text: #f2f8fa;
	--s51-muted: #b8cbd2;
	--s51-faint: #7e98a4;
	--s51-line: rgba(153, 190, 204, .2);
	--s51-line-strong: rgba(153, 190, 204, .43);
	--s51-accent: #65c4d0;
	--s51-accent-strong: #b9f4f7;
	--s51-accent-soft: rgba(101, 196, 208, .16);
	--s51-audio: #91d6ae;
	--s51-control: #becad6;
	--s51-warning: #f1c07e;
	position: relative;
	background: var(--s51-bg);
	color: var(--s51-text);
	font-family: Inter, "PingFang SC", "Microsoft YaHei", sans-serif;
}
.s51-auditorium-cn *,
.s51-auditorium-cn *::before,
.s51-auditorium-cn *::after { box-sizing: border-box; }
.s51-auditorium-cn h1,
.s51-auditorium-cn h2,
.s51-auditorium-cn h3,
.s51-auditorium-cn p,
.s51-auditorium-cn figure,
.s51-auditorium-cn ul { margin-top: 0; }
.s51-auditorium-cn a { color: inherit; text-decoration: none; }
.s51-auditorium-cn a:not(.s51-button) { border-bottom: 1px solid rgba(101, 196, 208, .5); }
.s51-auditorium-cn a:not(.s51-button):hover { border-bottom-color: var(--s51-accent-strong); color: var(--s51-accent-strong); }
.s51-auditorium-cn img { display: block; max-width: 100%; }
.s51-auditorium-cn .s51-eyebrow,
.s51-auditorium-cn .s51-hero__meta,
.s51-auditorium-cn .s51-hero__meta span { font-size: 11px !important; }
.s51-auditorium-cn .s51-hero__meta { margin-top: 22px !important; }
.s51-shell,
.s51-content { width: min(1240px, calc(100% - 80px)); margin-right: auto; margin-left: auto; }
.s51-shell { width: min(1280px, calc(100% - 80px)); }
.s51-sr-only { position: absolute !important; width: 1px !important; height: 1px !important; padding: 0 !important; margin: -1px !important; overflow: hidden !important; clip: rect(0, 0, 0, 0) !important; white-space: nowrap !important; border: 0 !important; }
.s51-eyebrow { display: flex; align-items: center; gap: 10px; margin-bottom: 0; color: var(--s51-accent); font-size: 11px; font-weight: 600; letter-spacing: .14em; line-height: 1.35; text-transform: uppercase; }
.s51-eyebrow > span:first-child:not(.s51-eyebrow__no) { width: 8px; height: 8px; border: 1px solid var(--s51-accent); border-radius: 50%; box-shadow: 0 0 0 4px var(--s51-accent-soft); }
.s51-eyebrow__no { min-width: 22px; color: var(--s51-accent-strong); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 11px; letter-spacing: .08em; }
.s51-hero { position: relative; min-height: 100svh; overflow: hidden; background: #07141d; }
.s51-hero__media,
.s51-hero__scrim { position: absolute; inset: 0; }
.s51-hero__media img { width: 100%; height: 100%; object-fit: cover; object-position: center 53%; opacity: .74; }
.s51-hero__scrim { background: linear-gradient(90deg, rgba(3, 9, 14, .97) 0%, rgba(3, 9, 14, .86) 32%, rgba(3, 9, 14, .33) 74%, rgba(3, 9, 14, .63) 100%), linear-gradient(0deg, rgba(2, 6, 10, .98) 0%, transparent 60%, rgba(2, 6, 10, .34) 100%); }
.s51-hero__inner { position: relative; display: flex; align-items: flex-end; min-height: inherit; padding-top: 132px; padding-bottom: 74px; }
.s51-hero__copy { max-width: 820px; }
.s51-hero h1 { max-width: 930px; margin: 24px 0 0; color: #f5fbfd; font-size: clamp(58px, 7vw, 104px); font-weight: 500; letter-spacing: -.065em; line-height: .98; text-wrap: balance; }
.s51-hero__lead { max-width: 780px; margin: 29px 0 0; color: #d4e5eb; font-size: clamp(17px, 1.6vw, 21px); line-height: 1.8; }
.s51-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 31px; }
.s51-button { display: inline-flex; align-items: center; justify-content: center; min-height: 46px; padding: 12px 18px; border: 1px solid transparent; border-radius: 2px; font-size: 13px; font-weight: 600; line-height: 1.3; transition: background-color .2s ease, border-color .2s ease, color .2s ease, transform .2s ease; }
.s51-button:hover { transform: translateY(-1px); }
.s51-button:focus-visible,
.s51-diagram__bar button:focus-visible,
.s51-faq-list summary:focus-visible { outline: 2px solid var(--s51-accent-strong); outline-offset: 3px; }
.s51-button--primary { background: var(--s51-accent); color: #061016 !important; }
.s51-button--primary:hover { background: var(--s51-accent-strong); }
.s51-button--quiet { border-color: rgba(186, 220, 229, .52); color: var(--s51-text) !important; }
.s51-button--quiet:hover { border-color: var(--s51-accent); color: var(--s51-accent-strong) !important; }
.s51-hero__meta { margin: 24px 0 0; color: #a9c6ce; font-size: 11px; line-height: 1.75; }
.s51-hero__meta span { display: inline-block; margin-top: 5px; color: #90aab5; font-size: 11px; }
.s51-hero__meta a { border-bottom-color: rgba(170, 229, 236, .46); }
.s51-hero__note { position: absolute; right: 0; bottom: 76px; max-width: 315px; margin: 0; padding-top: 14px; border-top: 1px solid rgba(101, 196, 208, .64); color: #c6d8df; font-size: 12px; line-height: 1.75; }
.s51-main { background: var(--s51-bg); }
.s51-section { padding: 64px 0; }
.s51-section:nth-child(odd) { background: var(--s51-bg); }
.s51-section:nth-child(even) { background: var(--s51-panel); }
.s51-section-head h2,
.s51-delivery-copy h2,
.s51-contact h2 { max-width: 840px; margin: 20px 0 0; color: var(--s51-text); font-size: clamp(34px, 4.1vw, 64px); font-weight: 500; letter-spacing: -.052em; line-height: 1.08; text-wrap: balance; }
.s51-section-head > p:last-child { max-width: 720px; margin: 26px 0 0; color: var(--s51-muted); font-size: 16px; line-height: 1.85; }
.s51-section-head--split { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(280px, .95fr); gap: 7vw; align-items: start; }
.s51-section-head--split > p:last-child { margin: 0; }
.s51-section-head--wide { max-width: 930px; }
.s51-two-column { display: grid; grid-template-columns: minmax(0, 1fr) minmax(300px, .72fr); gap: 9vw; align-items: start; }
.s51-problem__copy { color: var(--s51-muted); font-size: 16px; line-height: 1.85; }
.s51-problem__copy p { margin-bottom: 0; }
.s51-problem__copy p + p { margin-top: 18px; color: var(--s51-faint); }
.s51-signal-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; margin-top: 70px; }
.s51-signal-grid article { min-height: 196px; padding: 22px; border-top: 1px solid var(--s51-accent); border-right: 1px solid var(--s51-line); border-bottom: 1px solid var(--s51-line); border-left: 1px solid var(--s51-line); background: rgba(10, 27, 38, .64); }
.s51-index { color: var(--s51-accent); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 11px; letter-spacing: .08em; }
.s51-signal-grid h3,
.s51-service-row h3,
.s51-scene-grid h3 { margin: 26px 0 0; color: var(--s51-text); font-size: 20px; font-weight: 500; letter-spacing: -.025em; line-height: 1.4; }
.s51-signal-grid p,
.s51-service-row p,
.s51-scene-grid p { margin: 10px 0 0; color: var(--s51-muted); font-size: 14px; line-height: 1.8; }
.s51-architecture { background: var(--s51-panel-2) !important; }
.s51-architecture-board { margin-top: 55px; padding: 15px; border: 1px solid var(--s51-line); background: rgba(3, 7, 11, .62); }
.s51-diagram__bar { display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 4px 5px 14px; border-bottom: 1px solid var(--s51-line); }
.s51-diagram__bar p { display: flex; align-items: center; gap: 10px; margin: 0; color: var(--s51-faint); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 10px; letter-spacing: .11em; line-height: 1.4; }
.s51-diagram__bar p span { width: 6px; height: 6px; border-radius: 50%; background: var(--s51-accent); box-shadow: 0 0 0 4px var(--s51-accent-soft); }
.s51-diagram__bar button { min-height: 34px; padding: 7px 12px; border: 1px solid var(--s51-line-strong); border-radius: 2px; background: transparent; color: var(--s51-text); cursor: pointer; font: inherit; font-size: 11px; }
.s51-diagram__bar button:hover { border-color: var(--s51-accent); color: var(--s51-accent); }
.s51-diagram-canvas { position: relative; margin-top: 3px; overflow: hidden; }
.s51-flow-lines { position: absolute; z-index: 0; inset: 0; width: 100%; height: 100%; pointer-events: none; }
.s51-flow-lines path { fill: none; stroke: var(--s51-accent); stroke-width: 1.35; stroke-linecap: round; vector-effect: non-scaling-stroke; opacity: .6; }
.s51-flow-lines path.s51-line-motion { stroke-dasharray: 100; stroke-dashoffset: 100; opacity: 0; }
.s51-flow-lanes { position: relative; z-index: 1; display: grid; gap: 14px; padding: 20px 17px 17px; }
.s51-flow-lane { display: grid; grid-template-columns: 64px repeat(3, minmax(0, 1fr)); gap: 16px; align-items: stretch; }
.s51-lane-label { align-self: start; margin: 12px 0 0; color: var(--s51-accent); font-size: 12px; font-weight: 600; letter-spacing: .1em; }
.s51-flow-lane--audio .s51-lane-label { color: var(--s51-audio); }
.s51-flow-lane--control .s51-lane-label { color: var(--s51-control); }
.s51-node { min-height: 116px; padding: 17px 16px; border: 1px solid var(--s51-line-strong); background: rgba(16, 36, 49, .9); box-shadow: 0 13px 28px rgba(0, 0, 0, .2); }
.s51-node--core { border-color: rgba(101, 196, 208, .74); background: linear-gradient(145deg, rgba(17, 57, 65, .94), rgba(8, 25, 34, .97)); }
.s51-node--output { border-color: rgba(179, 205, 215, .5); background: rgba(10, 24, 34, .95); }
.s51-node > span { display: block; margin-bottom: 11px; color: var(--s51-accent); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 10px; letter-spacing: .1em; }
.s51-flow-lane--audio .s51-node > span { color: var(--s51-audio); }
.s51-flow-lane--control .s51-node > span { color: var(--s51-control); }
.s51-node strong { display: block; color: var(--s51-text); font-size: 17px; font-weight: 500; letter-spacing: -.02em; line-height: 1.4; }
.s51-node small { display: block; margin-top: 8px; color: var(--s51-muted); font-size: 12px; line-height: 1.62; }
.s51-optional { position: relative; z-index: 1; margin: 0 17px 17px 97px; padding: 16px 19px; border: 1px dashed rgba(101, 196, 208, .55); background: rgba(11, 29, 39, .66); }
.s51-optional span { display: block; color: var(--s51-accent); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 10px; letter-spacing: .1em; }
.s51-optional strong { display: block; margin-top: 7px; color: var(--s51-text); font-size: 17px; font-weight: 500; }
.s51-optional p { max-width: 690px; margin: 6px 0 0; color: var(--s51-muted); font-size: 13px; line-height: 1.7; }
.s51-diagram__legend { display: flex; align-items: center; flex-wrap: wrap; gap: 18px; padding: 14px 5px 2px; border-top: 1px solid var(--s51-line); color: var(--s51-muted); font-size: 12px; }
.s51-legend-line { display: inline-block; width: 28px; margin-right: 7px; vertical-align: middle; border-top: 1px solid var(--s51-accent); }
.s51-legend-line--audio { border-top-color: var(--s51-audio); }
.s51-legend-line--control { border-top-color: var(--s51-control); border-top-style: dashed; }
.s51-flow-lane--audio .s51-node { border-color: rgba(145, 214, 174, .38); }
.s51-flow-lane--audio .s51-node--core { border-color: rgba(145, 214, 174, .74); }
.s51-flow-lane--control .s51-node { border-color: rgba(190, 202, 214, .38); }
.s51-flow-lane--control .s51-node--core { border-color: rgba(190, 202, 214, .68); }
.s51-auditorium-cn .s51-scheme-figure { margin: 12px 0 0 !important; padding: 12px; border: 1px solid var(--s51-line); background: rgba(3, 7, 11, .74); }
.s51-scheme-figure a { display: block; border: 0 !important; }
.s51-scheme-figure img { width: 100%; height: auto; border: 1px solid rgba(157, 198, 213, .25); object-fit: contain; }
.s51-scheme-figure figcaption { margin: 12px 4px 1px; color: var(--s51-faint); font-size: 12px; line-height: 1.7; }
.s51-architecture-board.is-flow-running .s51-flow-lines path.s51-line-motion { animation-name: s51-path-loop; animation-duration: 8.4s; animation-timing-function: linear; animation-iteration-count: infinite; animation-fill-mode: both; }
.s51-architecture-board.is-flow-running .s51-flow-lines path.s51-line-motion[data-s51-path="video-process-out"] { animation-delay: .22s; }
.s51-architecture-board.is-flow-running .s51-flow-lines path.s51-line-motion[data-s51-path="audio-in-process"] { animation-delay: .44s; }
.s51-architecture-board.is-flow-running .s51-flow-lines path.s51-line-motion[data-s51-path="audio-process-out"] { animation-delay: .66s; }
.s51-architecture-board.is-flow-running .s51-flow-lines path.s51-line-motion[data-s51-path="control-in-process"] { animation-delay: .88s; }
.s51-architecture-board.is-flow-running .s51-flow-lines path.s51-line-motion[data-s51-path="control-process-out"] { animation-delay: 1.1s; }
.s51-flow-lines path[data-s51-path*="audio"] { stroke: var(--s51-audio); }
.s51-flow-lines path[data-s51-path*="control"] { stroke: var(--s51-control); stroke-dasharray: 5 7; }
@keyframes s51-path-loop {
	0% { stroke-dashoffset: 100; opacity: 0; }
	10% { opacity: .9; }
	72% { opacity: .9; }
	100% { stroke-dashoffset: 0; opacity: 0; }
}
.s51-service-list { margin-top: 55px; border-top: 1px solid var(--s51-line); }
.s51-service-row { display: grid; grid-template-columns: 72px minmax(0, 1fr); gap: 26px; padding: 26px 0 29px; border-bottom: 1px solid var(--s51-line); }
.s51-service-row h3 { margin-top: 0; font-size: 21px; }
.s51-service-row p { max-width: 900px; margin-top: 8px; }
.s51-delivery { background: var(--s51-panel) !important; }
.s51-delivery-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(300px, .72fr); gap: 7vw; align-items: start; }
.s51-delivery-copy > p:not(.s51-eyebrow) { max-width: 710px; margin: 27px 0 0; color: var(--s51-muted); font-size: 16px; line-height: 1.85; }
.s51-delivery-copy ul { display: grid; gap: 0; max-width: 720px; margin: 34px 0 0; padding: 0; list-style: none; border-top: 1px solid var(--s51-line); }
.s51-delivery-copy li { position: relative; padding: 15px 0 16px 24px; border-bottom: 1px solid var(--s51-line); color: var(--s51-text); font-size: 14px; line-height: 1.7; }
.s51-delivery-copy li::before { position: absolute; top: 21px; left: 2px; width: 7px; height: 7px; border: 1px solid var(--s51-accent); border-radius: 50%; content: ""; }
.s51-delivery-note { color: var(--s51-warning) !important; font-size: 13px !important; }
.s51-scene-grid { display: grid; gap: 0; border-top: 1px solid var(--s51-line); }
.s51-scene-grid article { padding: 18px 0 20px; border-bottom: 1px solid var(--s51-line); }
.s51-scene-grid article > span { color: var(--s51-accent); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 11px; }
.s51-scene-grid h3 { margin-top: 11px; font-size: 19px; }
.s51-boundary { background: var(--s51-bg) !important; }
.s51-boundary-table { max-width: 1000px; margin-top: 48px; border-top: 1px solid var(--s51-line); }
.s51-boundary-table article { display: grid; grid-template-columns: 150px minmax(0, 1fr); gap: 26px; padding: 22px 0 24px; border-bottom: 1px solid var(--s51-line); }
.s51-boundary-table p { margin: 0; color: var(--s51-muted); font-size: 15px; line-height: 1.8; }
.s51-faq { background: var(--s51-panel-2) !important; }
.s51-faq-list { max-width: 940px; margin-top: 48px; border-top: 1px solid var(--s51-line); }
.s51-faq-list details { border-bottom: 1px solid var(--s51-line); }
.s51-faq-list summary { display: flex; align-items: center; justify-content: space-between; gap: 25px; padding: 23px 0; color: var(--s51-text); cursor: pointer; font-size: 17px; font-weight: 500; list-style: none; }
.s51-faq-list summary::-webkit-details-marker { display: none; }
.s51-faq-list summary span { flex: 0 0 auto; color: var(--s51-accent); font-size: 21px; font-weight: 300; }
.s51-faq-list details[open] summary span { transform: rotate(45deg); }
.s51-faq-list details p { max-width: 810px; margin: -3px 0 23px; color: var(--s51-muted); font-size: 14px; line-height: 1.85; }
.s51-contact { padding: 64px 0 78px; background: #102a35; }
.s51-contact__inner { display: flex; align-items: end; justify-content: space-between; gap: 40px; }
.s51-contact h2 { max-width: 730px; }
.s51-contact__inner > div > p:last-child { max-width: 720px; margin: 25px 0 0; color: var(--s51-muted); font-size: 16px; line-height: 1.8; }
.s51-contact .s51-button { flex: 0 0 auto; }
.s51-auditorium-cn.s51-js [data-s51-reveal] { opacity: 0; transform: translateY(20px); transition: opacity .7s ease, transform .7s ease; }
.s51-auditorium-cn.s51-js [data-s51-reveal].is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
	.s51-auditorium-cn.s51-js [data-s51-reveal] { opacity: 1; transform: none; transition: none; }
	.s51-architecture-board.is-flow-running .s51-flow-lines path.s51-line-motion,
	.s51-flow-lines path.s51-line-motion { animation-name: none !important; animation-duration: 0s !important; animation-iteration-count: 1 !important; stroke-dashoffset: 0; opacity: .7; }
}
@media (max-width: 800px) {
	.s51-shell,
	.s51-content { width: calc(100% - 40px); }
	.s51-hero { min-height: 0; }
	.s51-hero__inner { display: block; min-height: 0; padding: 92px 0 49px; }
	.s51-hero__copy { max-width: none; }
	.s51-hero h1 { margin-top: 24px; font-size: clamp(44px, 11vw, 62px); line-height: 1.04; }
	.s51-hero__lead { margin-top: 22px; font-size: 17px; line-height: 1.78; }
	.s51-hero__meta { margin-top: 22px; font-size: 11px; line-height: 1.7; }
	.s51-hero__note { display: none; }
	.s51-hero__media img { object-position: 62% center; }
	.s51-section { padding: 44px 0; }
	.s51-section-head--split,
	.s51-two-column,
	.s51-delivery-grid,
	.s51-contact__inner { display: block; }
	.s51-section-head--split > p:last-child,
	.s51-problem__copy { margin-top: 22px; }
	.s51-section-head h2,
	.s51-delivery-copy h2 { margin-top: 16px; font-size: 35px; }
	.s51-section-head > p:last-child,
	.s51-delivery-copy > p:not(.s51-eyebrow),
	.s51-contact__inner > div > p:last-child { margin-top: 18px; font-size: 15px; line-height: 1.82; }
	.s51-signal-grid { grid-template-columns: 1fr; gap: 14px; margin-top: 42px; }
	.s51-signal-grid article { min-height: 0; padding: 20px; }
	.s51-architecture-board { margin-top: 36px; padding: 12px; }
	.s51-diagram__bar { align-items: flex-start; flex-direction: column; gap: 13px; }
	.s51-diagram__bar button { width: 100%; }
	.s51-flow-lanes { gap: 18px; padding: 18px 10px 15px; }
	.s51-flow-lane { grid-template-columns: 1fr; gap: 10px; }
	.s51-lane-label { margin: 0; padding: 1px 0 2px; }
	.s51-node { min-height: 0; padding: 16px; }
	.s51-node strong { font-size: 16px; }
	.s51-optional { margin: 0 10px 14px; }
	.s51-diagram__legend { align-items: flex-start; flex-direction: column; gap: 10px; padding: 13px 5px 4px; }
	.s51-auditorium-cn .s51-scheme-figure { margin-top: 24px !important; padding: 8px; }
	.s51-scheme-figure figcaption { margin-top: 10px; font-size: 11px; }
	.s51-service-list { margin-top: 38px; }
	.s51-service-row { grid-template-columns: 42px minmax(0, 1fr); gap: 14px; padding: 21px 0 24px; }
	.s51-service-row h3 { font-size: 18px; }
	.s51-service-row p { font-size: 13px; }
	.s51-scene-grid { margin-top: 42px; }
	.s51-boundary-table article { grid-template-columns: 110px minmax(0, 1fr); gap: 14px; }
	.s51-contact { padding: 55px 0 64px; }
	.s51-contact .s51-button { margin-top: 28px; }
}
@media (max-width: 430px) {
	.s51-shell,
	.s51-content { width: calc(100% - 40px); }
	.s51-hero__inner { padding-top: 76px; }
	.s51-hero h1 { font-size: 45px; }
	.s51-hero__lead { font-size: 16px; }
	.s51-actions { align-items: stretch; flex-direction: column; }
	.s51-button { width: 100%; }
	.s51-section-head h2,
	.s51-contact h2 { font-size: 32px; }
	.s51-boundary-table article { grid-template-columns: 1fr; gap: 9px; }
}