/* 首页 · 第五版
   配色沿用第四版（用户满意）：暖白纸面、宋体标题、钢蓝 = AI 接入，炉火橙 = 人确认与主要按钮。
   第五版按 frontend-design 收敛：标题左对齐、开屏标题放左下、只留开屏一处主动效、去掉颗粒和模板化小部件。 */
/* 手机：关掉双击放大和横屏字号自动放大，免得页面被放大后看着整体偏到一边；双指缩放照常可用 */
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; touch-action: manipulation; }
body {
  --bg: hsl(40 8% 98%);
  --cream: #F4F2EE;
  --paper: #FFFFFF;
  --ink: hsl(0 0% 7%);
  --ink-60: hsl(0 0% 7% / .58);
  --ink-35: hsl(0 0% 7% / .36);
  --hair: #D6D3D1;
  --stone: #44403C;
  --mute: #A8A29E;
  --steel: hsl(210 52% 36%);
  --steel-soft: hsl(210 34% 95%);
  --steel-hi: hsl(210 70% 56%);
  --steel-glow: color-mix(in srgb, var(--steel-hi) 60%, transparent);
  --ember: hsl(22 92% 52%);
  --ember-soft: hsl(24 95% 53% / .12);
  --night: #101014;
  --paper-shadow: 0 1px 2px hsl(0 0% 7% / .04), 0 14px 40px -18px hsl(0 0% 7% / .16);
  --serif: "Noto Serif SC", "Songti SC", "STSong", serif;
  --sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --italic: var(--serif);
  --ease: cubic-bezier(.16, 1, .3, 1);
  --x: clamp(20px, 6vw, 96px);
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
body::before { display: none; }
:where(body a) { color: inherit; text-decoration: none; }
body h1, body h2, body h3 { margin: 0; font-weight: 700; text-wrap: balance; }
body p { margin: 0; }
body figure { margin: 0; }

/* 按钮：胶囊，悬停上浮 1px */
.pill { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 46px; padding: 0 28px; border-radius: 999px; font-size: 14.5px; font-weight: 400; letter-spacing: .05em; white-space: nowrap; transition: background-color .2s, box-shadow .2s, transform .12s; }
.pill:hover { transform: translateY(-1px); }
.pill:active { transform: translateY(1px); }
button.pill { border: 0; font-family: inherit; cursor: pointer; }
.pill-ember { background: var(--ember); color: #fff; }
.pill-ember:hover { box-shadow: 0 6px 18px hsl(22 92% 52% / .28); }
.pill-dark { background: #1C1917; color: #fff; }
.pill-white { background: #fff; color: #111; }
.pill-ghost { box-shadow: inset 0 0 0 .5px var(--hair); background: hsl(0 0% 100% / .7); color: var(--ink); }
.pill-ghost:hover { box-shadow: inset 0 0 0 .5px hsl(24 90% 70%), 0 8px 30px var(--ember-soft); }
.pill-glass { background: hsl(0 0% 100% / .1); color: #fff; box-shadow: inset 0 0 0 .5px hsl(0 0% 100% / .45); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); }
.pill-glass:hover { background: hsl(0 0% 100% / .18); }

.eyebrow { display: inline-flex; align-items: center; gap: 12px; font-family: var(--italic); font-size: 12px; letter-spacing: .32em; text-transform: uppercase; color: var(--ink-35); }
.eyebrow .star { color: var(--ember); letter-spacing: 0; }

/* 顶栏：画面上是渐变玻璃，滚过开屏变纸色 */
.top { position: fixed; inset: 0 0 auto; z-index: 60; transition: background .35s, box-shadow .35s; }
.top::before { content: ""; position: absolute; inset: 0 0 -30px; background: linear-gradient(#000c, transparent); opacity: .5; pointer-events: none; transition: opacity .35s; }
.top .in { position: relative; display: flex; align-items: center; gap: 28px; max-width: 1320px; margin: 0 auto; padding: 14px var(--x); padding-top: calc(14px + env(safe-area-inset-top, 0px)); }
.logo { display: inline-flex; align-items: center; gap: 10px; }
.logo svg { width: 22px; height: 22px; flex: none; }
.logo b { font-family: var(--serif); font-size: 18px; font-weight: 700; letter-spacing: .06em; }
.logo span { font-family: var(--italic); font-size: 14px; letter-spacing: .02em; opacity: .7; }
.menu { display: flex; gap: 6px; margin-left: 8px; }
.menu a { font-size: 13.5px; letter-spacing: .05em; padding: 5px 14px; border-radius: 999px; opacity: .86; transition: background-color .18s, opacity .18s, transform .12s; }
.menu a:hover { opacity: 1; transform: translateY(-1px); background: hsl(0 0% 100% / .12); }
.top .act { margin-left: auto; }
.top .act .pill { min-height: 36px; padding: 0 18px; font-size: 13.5px; }
.top:not(.scrolled) { color: #fff; }
.top.scrolled { background: hsl(40 8% 98% / .86); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px); box-shadow: 0 .5px 0 var(--hair); }
.top.scrolled::before { opacity: 0; }
.top.scrolled .menu a:hover { background: hsl(0 0% 0% / .05); }

/* 开屏：整屏意象视频（先放静帧），标题压在画面上 */
.hero { position: relative; min-height: max(640px, 100svh); display: flex; align-items: center; justify-content: center; color: #fff; overflow: hidden; background: #0B0A09; }
.hero-art { position: absolute; inset: 0; background: #0B0A09; }
.hero-art video { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.hero-scrim { position: absolute; inset: 0; background: radial-gradient(ellipse 62% 34% at 50% 52%, hsl(20 10% 4% / .38), transparent 72%), linear-gradient(0deg, hsl(20 10% 4% / .6), transparent 35%), linear-gradient(180deg, hsl(20 10% 4% / .45), transparent 22%); }
.hero-in { position: relative; z-index: 2; width: min(1240px, 100% - 2 * var(--x)); padding-top: var(--top-h, 64px); text-align: center; }
.hero h1 { font-family: var(--serif); font-size: clamp(25px, 5.2vw, 78px); line-height: 1.2; letter-spacing: .04em; white-space: nowrap; text-shadow: 0 2px 50px hsl(20 10% 4% / .6); }
/* 全角逗号的字身右半是空的，居中时整行看着偏右；收掉这半格。字距也会在行尾多出一截，用缩进补回 */
.hero h1 { text-indent: .04em; }
.hero h1 .p { margin-right: -.36em; }
.hero h1 .brk { display: none; }
.hero .sub { margin: 20px 0 0; text-indent: .06em; font-size: clamp(15px, 1.4vw, 19px); color: hsl(0 0% 100% / .78); letter-spacing: .06em; }
.hero .acts { margin-top: 34px; display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; }
/* 标题逐字打出：字从模糊里浮出，光标跟着走；两行打完再出副标题和按钮 */
.hero h1.typing { min-height: 1.2em; }
.hero h1 .ln { display: block; }
.hero h1 .ch { display: none; }
.hero h1 .ch.on { display: inline-block; animation: chIn .55s var(--ease) both; }
@keyframes chIn { from { opacity: 0; filter: blur(10px); transform: translateY(.18em); } }
.hero h1 .caret { display: inline-block; width: .06em; height: .9em; margin-left: .08em; vertical-align: -.06em; background: var(--ember); animation: blink 1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }
.hero .sub, .hero .acts { transition: opacity .9s var(--ease), transform .9s var(--ease); }
.hero.pre .sub, .hero.pre .acts { opacity: 0; transform: translateY(10px); }
/* 开声音：开屏右下角，和标题区分开 */
.hero .sound { position: absolute; right: calc(var(--x) - 12px); bottom: clamp(18px, 3.4vh, 34px); z-index: 2; display: grid; place-items: center; width: 44px; height: 44px; padding: 0; border: 0; border-radius: 50%; background: hsl(0 0% 100% / .04); box-shadow: inset 0 0 0 .75px hsl(0 0% 100% / .38); color: #fff; cursor: pointer; -webkit-backdrop-filter: blur(6px); backdrop-filter: blur(6px); transition: opacity .9s var(--ease), background-color .25s, box-shadow .25s; }
.hero .sound:hover { background: hsl(0 0% 100% / .1); box-shadow: inset 0 0 0 .75px hsl(0 0% 100% / .6); }
.hero .sound:focus-visible { outline: 1.5px solid hsl(0 0% 100% / .8); outline-offset: 2px; }
/* 四根细竖条：静音时是一段静止、调淡的波形，开声音后像电平一样轻轻跳 */
.hero .sound .eq { display: flex; align-items: center; gap: 3px; height: 16px; }
.hero .sound .eq i { width: 2px; height: 16px; border-radius: 1px; background: currentColor; opacity: .5; transform: scaleY(var(--h)); transition: transform .5s var(--ease), opacity .4s; }
.hero .sound .eq i:nth-child(1) { --h: .35; } .hero .sound .eq i:nth-child(2) { --h: .7; } .hero .sound .eq i:nth-child(3) { --h: .5; } .hero .sound .eq i:nth-child(4) { --h: .25; }
.hero .sound:hover .eq i { opacity: .85; }
.hero .sound[aria-pressed="true"] .eq i { opacity: 1; animation: eq 1.1s ease-in-out infinite alternate; }
.hero .sound[aria-pressed="true"] .eq i:nth-child(1) { animation-duration: .9s; }
.hero .sound[aria-pressed="true"] .eq i:nth-child(2) { animation-duration: 1.3s; animation-delay: -.4s; }
.hero .sound[aria-pressed="true"] .eq i:nth-child(3) { animation-duration: 1s; animation-delay: -.7s; }
.hero .sound[aria-pressed="true"] .eq i:nth-child(4) { animation-duration: 1.2s; animation-delay: -.2s; }
@keyframes eq { 0% { transform: scaleY(.25); } 100% { transform: scaleY(1); } }
.hero.pre .sound { opacity: 0; }

.hero-note { position: absolute; right: var(--x); bottom: 24px; z-index: 2; font-size: 12px; color: hsl(0 0% 100% / .45); }

/* 区块骨架 */
.sec { padding: clamp(96px, 12vw, 168px) var(--x); }
.sec-in { max-width: 1240px; margin: 0 auto; }
.sec-head { max-width: 760px; margin: 0 0 clamp(40px, 5vw, 72px); }
.sec-head h2 { font-family: var(--serif); font-size: clamp(28px, 3.6vw, 46px); line-height: 1.36; letter-spacing: .01em; }
.sec-head p { margin-top: 16px; color: var(--ink-60); font-size: clamp(15px, 1.3vw, 17px); }

/* 做过的行业：一行发丝线 */
.fields { padding: 26px var(--x); border-bottom: .5px solid var(--hair); background: var(--bg); }
.fields .sec-in { display: flex; flex-wrap: wrap; justify-content: flex-start; align-items: center; gap: 10px 0; font-size: 14px; color: var(--stone); }
.fields span { padding: 0 clamp(14px, 2.4vw, 32px); border-left: .5px solid var(--hair); }
.fields span:first-child { padding-left: 0; }
.fields span:first-child { border-left: 0; color: var(--mute); }

/* 案例：两条大案例左右交替，三条小案例并排 */
.feat { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: clamp(28px, 4vw, 64px); align-items: center; }
.feat + .feat { margin-top: clamp(72px, 9vw, 128px); }
.feat.flip { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); }
.feat.flip .shot { order: 2; }
.shot { position: relative; display: block; border-radius: 16px; overflow: hidden; box-shadow: var(--paper-shadow); background: #1A1714; isolation: isolate; }
.feat .shot { aspect-ratio: 4 / 3; }
.shot > img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.shot .ph { position: absolute; inset: 0; z-index: -1; }
.shot > img ~ .ph { display: none; }
.shot .see { position: absolute; left: 18px; bottom: 18px; z-index: 2; display: inline-flex; align-items: center; gap: 9px; height: 38px; padding: 0 18px 0 14px; border-radius: 999px; background: hsl(0 0% 100% / .94); color: #111; font-size: 13px; font-weight: 400; letter-spacing: .04em; box-shadow: 0 8px 24px -10px hsl(0 0% 0% / .5); }
.shot .see::before { content: ""; border-left: 8px solid var(--ember); border-top: 5px solid transparent; border-bottom: 5px solid transparent; }
.ph-bg-dispatch { background: radial-gradient(30% 40% at 72% 42%, rgba(255,160,80,.5), transparent 70%), linear-gradient(180deg, #13110F, #1B1916); }
.ph-bg-project { background: radial-gradient(50% 60% at 80% 30%, rgba(255,190,120,.5), transparent 70%), linear-gradient(180deg, #2A2621, #1A1816); }
.ph-bg-pharma { background: radial-gradient(60% 70% at 70% 30%, #F4F6F7, #D5DADD 60%, #BCC3C8); }
.ph-bg-telecom { background: repeating-linear-gradient(90deg, transparent 0 46px, rgba(255,255,255,.04) 46px 48px), linear-gradient(180deg, #0C1014, #121820); }
.ph-bg-optics { background: radial-gradient(22% 30% at 55% 50%, rgba(255,255,255,.85), rgba(160,200,255,.3) 40%, transparent 70%), linear-gradient(180deg, #0F1012, #1A1B1E); }

.copy .tag { margin-bottom: 18px; }
.copy h3 { font-family: var(--serif); font-size: clamp(26px, 2.6vw, 38px); line-height: 1.35; letter-spacing: .01em; }
.copy h3 .k { display: inline-block; }
.copy > p { margin-top: 16px; color: var(--ink-60); font-size: 16px; max-width: 26em; }
.chaps { list-style: none; margin: 26px 0 0; padding: 0; border-top: .5px solid var(--hair); }
.chaps li { display: flex; align-items: baseline; gap: 16px; padding: 12px 0; border-bottom: .5px solid var(--hair); font-size: 14.5px; color: var(--stone); }
.chaps li em { font-family: var(--italic); font-style: italic; font-size: 17px; color: var(--mute); width: 22px; }
.chaps li span { margin-left: auto; font-size: 12.5px; color: var(--mute); }
.copy .links { margin-top: 26px; display: flex; gap: 12px; flex-wrap: wrap; }

.trio { margin-top: clamp(80px, 10vw, 136px); display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: clamp(18px, 2vw, 28px); }
.card { display: flex; flex-direction: column; gap: 14px; }
.card .shot { aspect-ratio: 4 / 3.2; }
.card .tag { align-self: flex-start; margin-top: 6px; }
.card h3 { font-family: var(--serif); font-size: clamp(20px, 1.7vw, 24px); line-height: 1.4; }
.card p { font-size: 14.5px; color: var(--ink-60); margin-top: -4px; }

/* 工作方式：深色一段，斜体大数字 */
.night { background: var(--night); color: #F4F2EE; }
.night .eyebrow { color: hsl(0 0% 100% / .42); }
.night .sec-head p { color: hsl(0 0% 100% / .6); }
.way { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: clamp(16px, 2vw, 28px); }
.way li { display: flex; flex-direction: column; }
.wk { display: block; width: 100%; height: auto; border-radius: 14px; background: hsl(0 0% 100% / .03); box-shadow: inset 0 0 0 .5px hsl(0 0% 100% / .1); }
.wk-base circle { fill: hsl(0 0% 100% / .14); }
.wk .near { fill: hsl(0 0% 100% / .42); }
.wk .me { fill: var(--ember); }
.wk .ring { fill: none; stroke: hsl(22 92% 52% / .5); stroke-width: 1; transform-box: fill-box; transform-origin: center; animation: wk-ring 2.4s ease-out infinite; }
@keyframes wk-ring { 0% { transform: scale(.6); opacity: 1; } 100% { transform: scale(1.8); opacity: 0; } }
.wk .plan { fill: none; stroke: hsl(0 0% 100% / .55); stroke-width: 1.2; stroke-dasharray: .012 .012; }
.wk .end { fill: var(--night); stroke: hsl(0 0% 100% / .7); stroke-width: 1.2; }
.wk .wire { fill: none; stroke: var(--steel-hi); stroke-width: 1.6; stroke-linejoin: round; }
.wk .lit { fill: var(--steel-hi); }
.wk .all { fill: var(--steel-hi); }
.way li:nth-child(4) .wk { background: radial-gradient(80% 90% at 50% 55%, hsl(210 70% 56% / .14), transparent 70%), hsl(0 0% 100% / .03); }
.wk-t { display: flex; align-items: baseline; gap: 12px; margin-top: 22px; }
.wk-t em { font-family: var(--serif); font-style: normal; font-weight: 700; font-size: 20px; line-height: 1; color: var(--ember); }
.wk-t h3 { font-family: var(--serif); font-size: 22px; font-weight: 600; }
.way p { margin-top: 8px; font-size: 14.5px; color: hsl(0 0% 100% / .62); }
/* 进场：先只剩底下的暗点，再从左到右一步步亮；第二、三步的线从头画到尾 */
.way.armed .wk-fx { opacity: 0; }
.way.armed .wk .wire { stroke-dashoffset: 1; stroke-dasharray: 1; }
.way.armed .wk-t, .way.armed p { opacity: 0; transform: translateY(8px); }
.way.armed.on .wk-fx { opacity: 1; transition: opacity .6s ease calc(var(--i) * .5s + .1s); }
.way.armed.on .wk .wire { stroke-dashoffset: 0; transition: stroke-dashoffset 1.1s var(--ease) calc(var(--i) * .5s + .2s); }
.way.armed.on .wk-t, .way.armed.on p { opacity: 1; transform: none; transition: opacity .6s, transform .7s var(--ease); transition-delay: calc(var(--i) * .5s + .15s); }

/* 团队 */
.crew { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: clamp(16px, 2vw, 28px); }
.crew figure { display: flex; flex-direction: column; gap: 6px; }
.crew .face { aspect-ratio: 4 / 5; border-radius: 16px; background: var(--cream); box-shadow: inset 0 0 0 .5px var(--hair); display: flex; align-items: flex-end; padding: 14px; font-size: 12px; color: var(--mute); margin-bottom: 10px; }
.crew b { font-family: var(--serif); font-size: 17px; font-weight: 600; }
.crew span { font-size: 13px; color: var(--ink-60); }

/* 结尾 */
.close { box-sizing: border-box; position: relative; isolation: isolate; overflow: hidden; min-height: clamp(620px, 80vh, 780px); padding-top: clamp(104px, 12vw, 160px); background: var(--cream); text-align: center; }
.close .sec-in { position: relative; }
.close h2 { font-family: var(--serif); font-size: clamp(30px, 4.2vw, 56px); line-height: 1.3; }
.close .acts { margin-top: clamp(28px, 3.4vw, 40px); display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; }
.reach { display: inline-flex; align-items: center; gap: 22px; margin-top: clamp(32px, 3.6vw, 44px); padding: 14px 28px 14px 14px; border-radius: 18px; background: var(--paper); box-shadow: var(--paper-shadow), 0 0 0 .5px var(--hair); text-align: left; }
.reach img { display: block; width: 128px; height: 128px; border-radius: 10px; }
.reach b { display: block; font-family: var(--serif); font-size: 20px; font-weight: 600; }
.reach span { display: block; margin-top: 6px; font-size: 13.5px; color: var(--ink-60); }
.close .br-m { display: none; }
.close-arc { position: absolute; inset: 0; z-index: -1; width: 100%; height: 100%; }
.close-arc .arc { fill: none; stroke: var(--ink-35); stroke-width: 1.2; vector-effect: non-scaling-stroke; stroke-dasharray: 1; transition: stroke-dashoffset 2.4s var(--ease); }
.close-arc .dot { fill: var(--ember); transform-box: fill-box; transform-origin: center; transition: transform .7s var(--ease) .2s, opacity .4s .2s; }
.close-arc .glow { transition: opacity 1.6s ease .4s; }
/* 动画只在脚本给了 armed 时才藏起来；进入视野加 on 再画开 */
.close.armed .arc { stroke-dashoffset: 1; }
.close.armed .dot { transform: scale(0); opacity: 0; }
.close.armed .glow { opacity: 0; }
.close.armed.on .arc { stroke-dashoffset: 0; }
.close.armed.on .dot { transform: none; opacity: 1; }
.close.armed.on .glow { opacity: 1; }
@media (max-width: 760px) { .close { min-height: 600px; padding-top: 96px; } .close .br-m { display: inline; } .reach { gap: 16px; padding: 12px 20px 12px 12px; } .reach img { width: 112px; height: 112px; } .reach b { font-size: 17px; } .reach span { font-size: 12.5px; } }
.base { background: var(--night); color: hsl(0 0% 100% / .6); padding: 28px var(--x) calc(28px + env(safe-area-inset-bottom, 0px)); font-size: 13px; }
.base .sec-in { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.base nav { display: flex; gap: 22px; }
.base a:hover { color: #fff; }


/* 接入：深色独立区块，三层图 + 三栏说明 */
.how { background: radial-gradient(60% 45% at 50% 62%, hsl(212 60% 24% / .45), transparent 70%), #08090C; color: #fff; }
.how .sec-head h2 { color: #fff; }
.how .sec-head p { color: hsl(0 0% 100% / .6); }
/* 接入：三层剖面。业务环节往下垂线接到智能层那条线上，现有系统往上接；--g1/--g2 是两段间距，垂线长度跟着算 */
.strata { --g1: 64px; --g2: 52px; --line: 44px; --head: 200px; max-width: 1240px; margin: clamp(28px, 4vw, 48px) auto 0; }
.st-row { display: grid; grid-template-columns: var(--head) minmax(0, 1fr); gap: 0 clamp(20px, 3vw, 40px); align-items: end; }
.st-core { margin-top: var(--g1); align-items: center; }
.st-sys { margin-top: var(--g2); align-items: start; }
.st-head h3 { font-family: var(--serif); font-size: clamp(18px, 1.6vw, 21px); font-weight: 600; color: #fff; }
.st-head p { margin-top: 6px; font-size: 13.5px; line-height: 1.6; color: hsl(0 0% 100% / .5); }
.st-biz { align-items: start; }
.st-biz .st-head, .st-sys .st-head { padding-top: 12px; }
.st-cells b { white-space: nowrap; }

.st-cells, .st-blocks { margin: 0; padding: 0; }
.st-cells { list-style: none; display: grid; grid-template-columns: repeat(10, minmax(0, 1fr)); gap: 0 8px; }
.st-cells li { position: relative; display: flex; flex-direction: column; gap: 6px; padding: 14px 2px 0; border-top: 1px solid hsl(0 0% 100% / .12); }
.st-cells li::before { content: ""; position: absolute; left: 0; right: 0; top: -1px; height: 2px; background: var(--steel-hi); box-shadow: 0 0 14px var(--steel-glow); transform: scaleX(0); transform-origin: left; transition: transform .7s cubic-bezier(.2, .7, .2, 1); }
.st-cells b { font-weight: 500; font-size: 15px; color: hsl(0 0% 100% / .42); letter-spacing: .02em; transition: color .6s; }
.st-cells span { min-height: 2.9em; font-size: 12px; line-height: 1.45; color: hsl(210 80% 80%); opacity: 0; transform: translateY(4px); transition: opacity .6s .15s, transform .6s .15s; }
.st-cells li.on::before { transform: scaleX(1); }
.st-cells li.on b { color: #fff; }
.st-cells li.on span { opacity: 1; transform: none; }
.st-cells li.hu::before { background: var(--ember); box-shadow: 0 0 14px hsl(22 92% 52% / .55); }
.st-cells li.hu span { color: hsl(28 100% 74%); }

/* 垂线：业务环节从底边垂到智能层的线；接通后变钢蓝，一颗光点往上走 */
.st-cells .w { position: absolute; left: 50%; top: 100%; width: 1px; height: calc(var(--g1) + var(--line) / 2); background: linear-gradient(hsl(0 0% 100% / .14), hsl(0 0% 100% / .06)); transition: background .6s; }
.st-cells .w::after { content: ""; position: absolute; left: -2px; bottom: 0; width: 5px; height: 5px; border-radius: 50%; background: #fff; box-shadow: 0 0 8px 2px var(--steel-glow); opacity: 0; }
.st-cells li.on .w { background: linear-gradient(color-mix(in srgb, var(--steel-hi) 80%, transparent), var(--steel-hi)); }
.st-cells li.on .w::after { animation: climb 2.4s cubic-bezier(.5, 0, .3, 1) infinite; animation-delay: var(--d, 0s); }
.st-cells li.hu.on .w { background: linear-gradient(hsl(22 92% 52% / .9), var(--steel-hi)); }
@keyframes climb { 0% { bottom: 0; opacity: 0; } 15% { opacity: 1; } 85% { opacity: 1; } 100% { bottom: 100%; opacity: 0; } }

/* 智能层：一条贯穿的线，越多环节接进来越亮 */
.st-line { --k: .1; position: relative; height: var(--line); display: flex; align-items: center; justify-content: space-around; }
.st-line::before { content: ""; position: absolute; left: 0; right: 0; top: 50%; height: 1px; background: linear-gradient(90deg, transparent, var(--steel-hi) 12%, var(--steel-hi) 88%, transparent); opacity: calc(.3 + .7 * var(--k)); box-shadow: 0 0 calc(18px * var(--k)) var(--steel-glow); transition: opacity .8s, box-shadow .8s; }
.st-line span { position: relative; padding: 6px 14px; border: .5px solid color-mix(in srgb, var(--steel-hi) 55%, transparent); border-radius: 999px; background: #0A0D13; font-size: 13px; color: hsl(210 70% 86%); letter-spacing: .04em; white-space: nowrap; }

.st-blocks { list-style: none; display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); gap: 8px; }
.st-blocks li { position: relative; display: grid; place-items: center; height: 46px; border: .5px solid hsl(0 0% 100% / .1); border-radius: 6px; background: hsl(0 0% 100% / .035); font-size: 13.5px; color: hsl(0 0% 100% / .62); white-space: nowrap; }
.st-blocks .w { position: absolute; left: 50%; bottom: 100%; width: 1px; height: calc(var(--g2) + var(--line) / 2); background: linear-gradient(hsl(0 0% 100% / .18), hsl(0 0% 100% / .08)); }
.legend { display: flex; gap: 22px; justify-content: flex-end; flex-wrap: wrap; max-width: 1240px; margin: 36px auto 0; font-size: 12.5px; color: hsl(0 0% 100% / .55); letter-spacing: .04em; }
.legend span { display: inline-flex; align-items: center; gap: 8px; }
.legend i { width: 7px; height: 7px; border-radius: 50%; background: var(--steel-hi); box-shadow: 0 0 10px var(--steel-glow); }
.legend i.hu { border-radius: 1px; transform: rotate(45deg); background: var(--ember); box-shadow: none; }
.legend em { font-style: normal; }
.legend b { font-weight: 400; color: #fff; font-variant-numeric: tabular-nums; }
.chipset { justify-content: flex-end; }
.chipset { display: flex; flex-wrap: wrap; gap: 6px; }
.chipset span { padding: 3px 12px; border-radius: 999px; box-shadow: inset 0 0 0 .5px var(--hair); background: var(--paper); font-size: 12.5px; color: var(--stone); }
.chipset span.ai { box-shadow: inset 0 0 0 1px var(--steel); color: var(--steel); }
.chipset span.hu { box-shadow: inset 0 0 0 1px var(--ember); color: var(--ember); }

/* 现场：整幅照片 */
.scene { position: relative; min-height: clamp(520px, 76vh, 860px); display: flex; align-items: flex-end; overflow: hidden; color: #fff; background: #0E0C0A; }
.scene > img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.scene::before { content: ""; position: absolute; inset: 0; z-index: 1; background: linear-gradient(0deg, hsl(20 10% 4% / .82), hsl(20 10% 4% / .2) 52%, transparent), linear-gradient(90deg, hsl(20 10% 4% / .5), transparent 60%); }
.scene .sec-in { position: relative; z-index: 2; width: 100%; padding: 0 var(--x) clamp(48px, 7vw, 96px); }
.scene .eyebrow { color: hsl(0 0% 100% / .55); }
.scene h2 { margin-top: 18px; font-family: var(--serif); font-size: clamp(28px, 3.6vw, 50px); line-height: 1.32; }
.scene p { margin-top: 16px; max-width: 30em; color: hsl(0 0% 100% / .72); }


@media (max-width: 1100px) {
  .feat, .feat.flip { grid-template-columns: minmax(0, 1fr); }
  .feat.flip .shot { order: 0; }
  .trio { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .way { grid-template-columns: repeat(2, minmax(0, 1fr)); row-gap: 48px; }
  .crew { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 1180px) {
  .strata { --head: 150px; }
  .st-cells { grid-template-columns: repeat(8, minmax(0, 1fr)); }
  .st-cells li:first-child, .st-cells li:last-child { display: none; }
}
@media (max-width: 760px) {
  .menu { display: none; }
  .logo span { display: none; }
  .hero .sound { bottom: 12px; }
  .strata { --g1: 52px; --g2: 44px; }
  .st-row { grid-template-columns: minmax(0, 1fr); }
  .st-head { margin-bottom: 14px; }
  .st-head p { display: none; }
  .st-head h3 { font-size: 15px; color: hsl(0 0% 100% / .6); font-family: var(--sans); font-weight: 400; letter-spacing: .06em; }
  .st-core .st-head, .st-sys .st-head { position: absolute; margin: 0; padding: 0; }
  .st-core, .st-sys { position: relative; }
  .st-core .st-head { left: 0; top: 50%; transform: translateY(-50%); z-index: 1; padding-right: 8px; background: #08090C; }
  .st-core .st-head h3 { color: hsl(210 70% 86%); }
  .st-line { padding-left: 62px; justify-content: space-between; }
  .st-sys .st-head { top: auto; bottom: -34px; }
  .st-cells, .st-blocks { grid-template-columns: repeat(var(--n), minmax(0, 1fr)); }
  .st-cells { --n: 5; gap: 0 6px; } .st-blocks { --n: 4; gap: 6px; }
  .st-cells .wide, .st-blocks .wide { display: none; }
  .st-cells b { font-size: 14px; } .st-cells span { font-size: 11px; min-height: 4.4em; }
  .st-line span { padding: 5px 8px; font-size: 11.5px; }
  .st-line span:nth-child(2) { display: none; }
  .st-blocks li { height: 40px; font-size: 12.5px; }
  .legend { justify-content: flex-start; margin-top: 58px; gap: 10px 18px; }
    .trio { grid-template-columns: minmax(0, 1fr); }
  .way { grid-template-columns: minmax(0, 1fr); row-gap: 0; }
  .way li { display: grid; grid-template-columns: 128px minmax(0, 1fr); grid-template-rows: auto 1fr; column-gap: 18px; padding: 18px 0; border-top: .5px solid hsl(0 0% 100% / .1); }
  .way li:first-child { border-top: 0; padding-top: 0; }
  .wk { grid-row: span 2; border-radius: 10px; }
  .wk-t { margin-top: 2px; gap: 10px; }
  .wk-t em { font-size: 16px; } .wk-t h3 { font-size: 18px; }
  .way p { margin-top: 4px; font-size: 14px; }
  /* 手机：「做过的行业」单独一行小字，行业名不用竖线，按词换行；大案例去掉图上的「看方案」，和下面的按钮不重复 */
  .fields { padding: 18px var(--x) 20px; }
  .fields .sec-in { gap: 8px 20px; font-size: 14px; }
  .fields span, .fields span:first-child { padding: 0; border-left: 0; }
  .fields span:first-child { flex-basis: 100%; font-size: 12.5px; }
  .feat { gap: 22px; }
  .feat + .feat { margin-top: 64px; }
  .feat .shot .see { display: none; }
  .copy .tag { margin-bottom: 10px; }
  .copy h3 { font-size: 26px; }
  .copy > p { margin-top: 12px; font-size: 15px; }
  .copy .links { margin-top: 20px; }
  .trio { margin-top: 64px; gap: 48px; }
}
/* 数据与安全（第三版）：浅底舞台，一圈虚线是企业数据边界；一张生产订单沿下方五个关口移动，到哪一关内容就变成哪一关的结果 */
.safe { background: var(--bg); }
.sg { --n: 5; position: relative; margin: 0; padding: 40px clamp(24px, 4vw, 56px) 28px; border-radius: 24px; border: 1px dashed hsl(210 52% 36% / .4); background: radial-gradient(70% 60% at 50% 40%, hsl(210 60% 96%), transparent 75%), var(--paper); }
.sg-tag { position: absolute; left: 28px; top: 0; transform: translateY(-50%); display: inline-flex; align-items: center; gap: 6px; padding: 4px 14px 4px 11px; border-radius: 999px; background: var(--paper); box-shadow: inset 0 0 0 .75px hsl(210 52% 36% / .4); font-size: 13px; font-weight: 500; color: var(--steel); }
.sg-tag svg { width: 13px; height: 13px; fill: none; stroke: currentColor; stroke-width: 1.4; }
.sg-stage { position: relative; height: 252px; }
.sg-card { position: absolute; left: 0; bottom: 18px; box-sizing: border-box; width: 336px; padding: 18px 20px 16px; border-radius: 14px; background: var(--paper); box-shadow: 0 0 0 .5px var(--hair), 0 1px 2px hsl(0 0% 7% / .05), 0 24px 48px -28px hsl(210 40% 20% / .45); transform: translateX(var(--cx, 0px)); transition: transform .7s var(--ease), opacity .5s, box-shadow .4s; }
.sg-card::after { content: ""; position: absolute; left: var(--tail, 50%); bottom: -19px; width: 1px; height: 18px; transition: left .7s var(--ease); background: linear-gradient(hsl(210 52% 36% / .5), transparent); }
.sg-hd { display: flex; justify-content: space-between; align-items: baseline; padding-bottom: 10px; border-bottom: .5px solid var(--hair); }
.sg-hd b { font-size: 15px; font-weight: 600; }
.sg-hd span { font-size: 11.5px; color: var(--mute); }
.sg-card dl { margin: 12px 0 0; display: grid; gap: 8px; font-size: 14px; }
.sg-card dl > div { display: flex; justify-content: space-between; }
.sg-card dt { color: var(--mute); }
.sg-card dd { margin: 0; font-variant-numeric: tabular-nums; }
.sg-sw { display: inline-grid; justify-items: end; }
.sg-sw > span { grid-area: 1 / 1; transition: opacity .4s, transform .5s var(--ease), color .4s; }
.sg-sw .n { padding: 0 6px; border-radius: 4px; background: hsl(210 34% 94%); color: var(--steel); opacity: 0; transform: translateY(5px); }
.sg[data-step="1"] .sg-sw .o, .sg[data-step="2"] .sg-sw .o, .sg[data-step="3"] .sg-sw .o, .sg[data-step="4"] .sg-sw .o { opacity: 0; transform: translateY(-5px); }
.sg[data-step="1"] .sg-sw .n, .sg[data-step="2"] .sg-sw .n, .sg[data-step="3"] .sg-sw .n, .sg[data-step="4"] .sg-sw .n { opacity: 1; transform: none; }
.sg-ft { display: grid; margin-top: 14px; padding-top: 12px; border-top: .5px solid var(--hair); font-size: 13px; color: var(--steel); }
.sg-ft span { grid-area: 1 / 1; opacity: 0; transform: translateY(5px); transition: opacity .35s, transform .5s var(--ease); }
.sg-ft .hu { display: inline-flex; align-items: center; gap: 7px; color: hsl(22 90% 42%); }
.sg-ft .hu::before { content: ""; width: 7px; height: 7px; border-radius: 1px; background: var(--ember); transform: rotate(45deg); }
.sg[data-step="0"] .sg-ft [data-at="0"], .sg[data-step="1"] .sg-ft [data-at="1"], .sg[data-step="2"] .sg-ft [data-at="2"],
.sg[data-step="3"]:not(.ok) .sg-ft .hu, .sg[data-step="3"].ok .sg-ft .okd, .sg[data-step="4"] .sg-ft [data-at="4"] { opacity: 1; transform: none; }
.sg[data-step="3"]:not(.ok) .sg-card { box-shadow: 0 0 0 1px hsl(22 92% 52% / .55), 0 24px 48px -28px hsl(22 50% 30% / .4); }
.sg.out .sg-card { opacity: 0; }
.sg-track { position: relative; list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(var(--n), minmax(0, 1fr)); }
.sg-track::before, .sg-track::after { content: ""; position: absolute; left: 10%; top: 7px; height: 1.5px; border-radius: 2px; }
.sg-track::before { right: 10%; background: hsl(210 20% 50% / .2); }
.sg-track::after { width: calc(80% * var(--p, 1)); background: var(--steel); transition: width .7s var(--ease); }
.sg-track li { position: relative; z-index: 1; display: flex; flex-direction: column; align-items: center; text-align: center; }
.sg-track i { width: 15px; height: 15px; border-radius: 50%; background: var(--paper); box-shadow: inset 0 0 0 1.5px hsl(210 20% 50% / .35); transition: background .4s, box-shadow .4s; }
.sg-track li.gate i { width: 13px; height: 13px; margin: 1px; border-radius: 2px; transform: rotate(45deg); }
.sg-track li.on i { background: var(--steel); box-shadow: 0 0 0 5px hsl(210 52% 36% / .12); }
.sg-track li.gate.wait i { background: var(--ember); box-shadow: 0 0 0 5px hsl(22 92% 52% / .16); animation: sg-pulse 1.4s ease-in-out infinite; }
@keyframes sg-pulse { 50% { box-shadow: 0 0 0 9px hsl(22 92% 52% / .06); } }
.sg-track b { margin-top: 14px; font-family: var(--serif); font-size: 18px; font-weight: 600; color: var(--ink-35); transition: color .4s; }
.sg-track small { margin-top: 2px; font-size: 13px; color: var(--mute); }
.sg-track li.on b, .sg-track li.cur b { color: var(--ink); }
.sg > figcaption { margin-top: 28px; font-size: 12px; color: var(--mute); }
@media (max-width: 760px) {
  .sg { padding: 40px 14px 18px; border-radius: 18px; }
  .sg-tag { left: 16px; }
  .sg-stage { height: 236px; }
  .sg-card { left: 50%; width: 272px; margin-left: -136px; padding: 16px 18px 14px; transform: none; }
  .sg-card dl { font-size: 13.5px; }
  .sg-card::after { display: none; }
  .sg-track b { margin-top: 10px; font-size: 14px; }
  .sg-track small { display: none; }
  .sg-track i { width: 12px; height: 12px; }
  .sg-track li.gate i { width: 10px; height: 10px; }
  .sg-track::before, .sg-track::after { top: 5.5px; }
}
/* 手机版首页（11-02 重排）：顶栏实底、开屏标题两行、行业做成标签、五个案例统一成同一种卡 */
@media (max-width: 760px) {
  .top.scrolled { background: hsl(40 8% 98% / .97); }
  .top .act .pill { min-height: 34px; padding: 0 16px; font-size: 13px; }
  .hero h1 { font-size: 34px; line-height: 1.34; white-space: normal; }
  .hero h1 .brk { display: block; }
  .hero h1 .p { margin-right: 0; }
  .hero .sub { margin-top: 16px; font-size: 14.5px; }
  .hero .acts { margin-top: 26px; }
  /* 行业标签排成一行，放不下就横着滑，右边渐隐提示还有 */
  .fields { padding: 18px 0 20px; }
  .fields .sec-in { flex-wrap: nowrap; gap: 8px; overflow-x: auto; padding: 0 var(--x); scrollbar-width: none; -webkit-mask-image: linear-gradient(90deg, #000 calc(100% - 36px), transparent); mask-image: linear-gradient(90deg, #000 calc(100% - 36px), transparent); }
  .fields .sec-in::-webkit-scrollbar { display: none; }
  .fields .sec-in::after { content: ""; flex: 0 0 calc(var(--x) - 8px); }
  .fields span, .fields span:first-child { flex: none; white-space: nowrap; }
  .fields span:first-child { margin-right: 4px; font-size: 12.5px; }
  .fields span:not(:first-child) { padding: 5px 12px; border-radius: 999px; background: hsl(40 10% 93%); font-size: 13px; color: var(--stone); }
  #cases { padding-top: 44px !important; }
  .feat, .feat.flip { gap: 0; }
  .card { gap: 0; }
  .feat .shot, .card .shot { aspect-ratio: 16 / 10; margin-bottom: 16px; border-radius: 12px; }
  .shot .see { display: none; }
  .copy .tag, .card .tag { display: block; margin: 0 0 8px; font-size: 12.5px; letter-spacing: .04em; color: var(--mute); }
  .copy h3, .card h3 { font-size: 22px; line-height: 1.4; letter-spacing: .02em; }
  /* 手机上案例只留行业、标题和入口，说明文字不显示（用户 11-02：太密） */
  .copy > p, .card p { display: none; }
  .copy .links { margin-top: 10px; }
  .feat + .feat, .trio { margin-top: 48px; }
  .trio { gap: 48px; }
  /* 手机正文放松：行距 1.9、字距 .03em，其他区块的说明文字一起 */
  .sec-head p, .way p, .scene p { line-height: 1.9; letter-spacing: .03em; text-wrap: pretty; }
  .sec-head p { margin-top: 14px; font-size: 15px; }
  .st-blocks li { font-size: 12px; letter-spacing: 0; white-space: nowrap; }
  .card::after { content: "看完整方案"; align-self: flex-start; margin-top: 10px; font-size: 14px; color: var(--ink); text-decoration: underline; text-decoration-thickness: .5px; text-underline-offset: 5px; }
  .copy .links .pill { min-height: 0; padding: 0; background: none; color: var(--ink); font-size: 14px; letter-spacing: 0; text-decoration: underline; text-decoration-thickness: .5px; text-underline-offset: 5px; }
}
@media (prefers-reduced-motion: reduce) {
  .st-cells .w::after { animation: none !important; }
  .hero .sound[aria-pressed="true"] .eq i { animation: none; transform: scaleY(.7); }
}