/* finesse · register=brand · A=graphite+engineering-orange · B=600/400-CJK-display
 * C=centered-photo+sticky-reading+weighted-case-grid · D=SVG-stage-story+CSS-entrance
 * E=building-junction+field-photography · SOUL=8 SPECTACLE=6 DENSITY=5 */
:root {
  --ink: #14201e; /* 石墨：深色背景与浅底主文 */
  --surface: #1d2b27; /* 深层：图解与深色控件 */
  --light: #eef1ec; /* 雾白：正文背景与深底主文 */
  --mist: #e2e8e1; /* 浅灰：阅读区层次 */
  --card: #f7f8f4; /* 纸白：输入控件与内容表面 */
  --muted: #59675e; /* 次文：仅用于浅底 */
  --muted-light: #b7c2b9; /* 次文：仅用于深底 */
  --signal: #ee8151; /* 工程橙：主按钮与路径强调 */
  --signal-deep: #ab431c; /* 深橙：浅底错误提示 */
  --stroke: rgb(20 32 30 / .17);
  --stroke-light: rgb(238 241 236 / .2);
  --shadow: 0 18px 50px rgb(8 20 15 / .17);
  --nav-bg: rgb(20 32 30 / .94);
  --photo-shade: rgb(12 24 21 / .6);
  --photo-clear: rgb(12 24 21 / .17);
  --photo-dark: rgb(12 24 21 / .94);
  --diagram-concrete: #34423b;
  --diagram-edge: #7c8d80;
  --diagram-grid: rgb(183 194 185 / .065);
  --diagram-speck: rgb(183 194 185 / .25);
  --diagram-water: #b7c2b9;
  --font: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --utility-font: "Helvetica Neue", Arial, sans-serif;
  --max: 1240px;
  --gutter: clamp(20px, 5.5vw, 80px);
  --radius: 22px;
  --radius-small: 12px;
  --nav-h: 104px;
  --z-nav: 100;
  --z-sticky: 5;
  --ease: cubic-bezier(.16, 1, .3, 1);
}
*, *::before, *::after { box-sizing: border-box; }
html { overflow-x: clip; scroll-behavior: smooth; scroll-padding-top: var(--nav-h); }
body { margin: 0; overflow-x: clip; background: var(--light); color: var(--ink); font-family: var(--font); font-size: 16px; font-weight: 400; line-height: 1.75; -webkit-font-smoothing: antialiased; }
body::before { content: ""; position: fixed; inset: 0; z-index: 150; pointer-events: none; opacity: .025; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.4'/%3E%3C/svg%3E"); }
::selection { background: var(--signal); color: var(--ink); }
img, svg { display: block; max-width: 100%; }
img { height: auto; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; }
button, summary { cursor: pointer; }
button { color: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button:active, .button:active { transform: translateY(1px); }
:focus-visible { outline: 3px solid var(--signal); outline-offset: 5px; }
input:focus-visible, select:focus-visible, textarea:focus-visible { outline-color: var(--ink); outline-offset: 3px; }
figure, p, h1, h2, h3, dl, dd { margin: 0; }
h1, h2, h3 { min-width: 0; overflow-wrap: anywhere; text-wrap: balance; font-weight: 600; letter-spacing: -.045em; }
h2 { font-size: clamp(32px, 3.6vw, 52px); line-height: 1.25; }
h3 { line-height: 1.4; }
ul, ol { padding: 0; margin: 0; list-style: none; }
small { font-size: 12px; }
[hidden] { display: none !important; }
.shell { width: min(var(--max), calc(100% - var(--gutter) * 2)); margin-inline: auto; }
.section { padding-block: clamp(72px, 8vw, 120px); scroll-margin-top: var(--nav-h); }
.section--ink { background: var(--ink); color: var(--light); }
.section--mist { background: var(--light); }
.section-intro { margin-bottom: 48px; max-width: 780px; }
.section-intro > p:not(.section-label) { margin-top: 18px; color: var(--muted); font-size: 17px; }
.section--ink .section-intro > p:not(.section-label) { color: var(--muted-light); }
.section-label { color: var(--muted); font-size: 13px; margin-bottom: 22px; letter-spacing: .08em; }
.section--ink .section-label { color: var(--muted-light); }
.section-note { margin-top: 24px; font-size: 12px; color: var(--muted); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.skip-link { position: fixed; top: -100px; left: 24px; z-index: 200; background: var(--signal); padding: 12px 20px; border-radius: var(--radius-small); }
.skip-link:focus { top: 12px; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 30px; min-height: 54px; padding: 13px 26px; border: 1px solid transparent; border-radius: 999px; font-size: 14px; font-weight: 600; white-space: nowrap; transition: background .25s, transform .25s var(--ease); }
.button > span, .text-link > span { font-size: 23px; font-weight: 400; line-height: 1; }
.button--signal { color: var(--ink); background: var(--signal); }
.button--signal:hover { background: var(--light); }
.contact .button--signal:hover { background: var(--mist); border-color: var(--stroke); }
.button--outline { background: var(--nav-bg); color: var(--light); border-color: var(--stroke-light); }
.button--outline:hover { background: var(--surface); }
.text-link { display: inline-flex; min-height: 44px; align-items: center; gap: 25px; color: var(--light); border: 0; padding: 8px 0; border-bottom: 1px solid var(--stroke-light); background: none; font-size: 14px; font-weight: 600; white-space: nowrap; }
.text-link--dark { color: var(--ink); border-color: var(--stroke); }
.text-link:hover { border-color: currentColor; }
.site-header { position: fixed; top: 20px; inset-inline: 0; z-index: var(--z-nav); pointer-events: none; }
.site-header__inner { width: min(var(--max), calc(100% - 48px)); height: 68px; padding: 9px 12px 9px 22px; display: flex; align-items: center; justify-content: space-between; gap: 24px; border: 1px solid var(--stroke-light); border-radius: 999px; background: var(--nav-bg); color: var(--light); box-shadow: var(--shadow); pointer-events: auto; }
.brand { display: inline-flex; align-items: center; gap: 12px; min-height: 44px; flex-shrink: 0; white-space: nowrap; }
.brand__logo { width: 190px; height: 48px; padding: 4px 6px; object-fit: contain; border-radius: 7px; background: #fff; }
.site-nav { display: flex; align-items: center; gap: 6px; }
.site-nav a { display: inline-flex; align-items: center; min-height: 44px; padding: 10px 16px; border-radius: 999px; white-space: nowrap; font-size: 13px; color: var(--muted-light); transition: color .2s, background .2s; }
.site-nav a:hover, .site-nav a.is-current { background: var(--surface); color: var(--light); }
.site-nav a.site-nav__cta { gap: 20px; background: var(--light); color: var(--ink); font-weight: 600; padding-inline: 21px; }
.site-nav .site-nav__cta:hover, .site-nav .site-nav__cta.is-current { background: var(--signal); color: var(--ink); }
.site-nav__cta > span { font-size: 20px; }
.menu-toggle { display: none; padding: 11px; min-width: 44px; height: 44px; border: 1px solid var(--stroke-light); border-radius: 50%; background: transparent; }
.menu-toggle > span:not(.sr-only) { display: block; width: 19px; height: 1px; background: currentColor; margin: 5px 0; }
.hero { position: relative; isolation: isolate; display: flex; flex-direction: column; min-height: clamp(740px, 100svh, 1050px); background: var(--ink); color: var(--light); overflow: clip; }
.hero__photo, .hero__scrim { position: absolute; inset: 0; z-index: -2; }
.hero__photo img { width: 100%; height: 100%; object-fit: cover; object-position: 55% center; opacity: .74; animation: photo-settle 1.5s var(--ease) both; }
.hero__scrim { z-index: -1; background: linear-gradient(180deg, var(--photo-shade) 0%, var(--photo-clear) 43%, var(--photo-dark) 100%), radial-gradient(ellipse at 50% 46%, var(--photo-clear), var(--photo-shade)); }
.hero__content { display: flex; flex-direction: column; align-items: center; justify-content: center; flex: 1; text-align: center; padding-top: 136px; padding-bottom: 56px; }
.hero__credential { display: inline-flex; align-items: center; gap: 10px; font-size: 12px; letter-spacing: .05em; color: var(--light); margin-bottom: 32px; }
.hero__credential > span { width: 6px; height: 6px; border-radius: 50%; background: var(--signal); }
.hero h1 { font-size: clamp(56px, 7.3vw, 106px); font-weight: 600; line-height: 1.14; letter-spacing: -.055em; }
.hero h1 > span { display: block; animation: title-enter 1s var(--ease) both; }
.hero h1 > span:nth-child(2) { color: var(--signal); animation-delay: .1s; }
.hero__period { display: inline-block; margin-left: -.1em; margin-right: -.45em; }
.hero__lead { margin-top: 28px; color: var(--light); font-size: 16px; letter-spacing: .06em; }
.hero__actions { display: flex; gap: 12px; justify-content: center; margin-top: 34px; }
.hero__hotline { display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 8px 22px; margin-top: 12px; }
.hero__hotline > span { font-size: 11px; color: var(--muted-light); }
.hero__hotline a { display: inline-flex; align-items: center; min-height: 44px; font-family: var(--utility-font); font-size: 15px; letter-spacing: .02em; }
.hero__hotline a:hover { color: var(--signal); }
.hero__foot { display: grid; grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr); align-items: center; border-top: 1px solid var(--stroke-light); padding-block: 25px 32px; gap: 28px; color: var(--muted-light); font-size: 12px; }
.hero__foot p > span { display: block; }
.hero__scroll { display: flex; align-items: center; gap: 22px; min-height: 44px; white-space: nowrap; }
.hero__scroll > span:last-child { color: var(--signal); font-size: 28px; }
.hero__since { text-align: right; }
.hero__since b { font-family: var(--utility-font); font-size: 24px; font-weight: 400; color: var(--light); }
@keyframes title-enter { from { transform: translateY(30px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }
@keyframes photo-settle { from { transform: scale(1.045); } to { transform: scale(1); } }
.scene-tabs { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 8px; margin-bottom: 22px; }
.scene-tab { min-width: 0; min-height: 74px; padding: 12px 8px; border: 1px solid var(--stroke); border-radius: var(--radius-small); background: transparent; font-size: 14px; font-weight: 600; white-space: nowrap; text-align: center; transition: background .2s, color .2s; }
.scene-tab small { display: block; color: var(--muted); font-size: 10px; font-weight: 400; margin-top: 5px; }
.scene-tab:hover { background: var(--mist); }
.scene-tab.is-active { background: var(--ink); color: var(--light); border-color: var(--ink); }
.scene-tab.is-active small { color: var(--muted-light); }
.scene-panel { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); border-radius: var(--radius); background: var(--mist); overflow: clip; scroll-margin-top: var(--nav-h); }
.scene-panel__image { position: relative; min-width: 0; min-height: 490px; background: var(--surface); }
.scene-panel__image img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.scene-panel__image figcaption { position: absolute; bottom: 0; inset-inline: 0; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px; padding: 42px 22px 19px; font-size: 11px; color: var(--light); background: linear-gradient(transparent, var(--photo-dark)); }
.scene-panel__copy { display: flex; flex-direction: column; align-items: flex-start; padding: clamp(24px, 3vw, 46px); }
.scene-panel__count { color: var(--muted); font-size: 12px; margin-bottom: 16px; }
.scene-panel h3 { font-size: 30px; margin-bottom: 18px; }
.scene-panel__lead { font-size: 15px; color: var(--muted); line-height: 1.9; }
.scene-panel__list { width: 100%; margin-block: 22px 26px; font-size: 13px; }
.scene-panel__list > div { display: grid; grid-template-columns: 68px minmax(0, 1fr); gap: 16px; border-top: 1px solid var(--stroke); padding-block: 12px; }
.scene-panel__list dt { color: var(--muted); }
.scene-panel .text-link { margin-top: auto; }
.specialties { display: flex; gap: 24px; padding-top: 30px; font-size: 12px; }
.specialties > span { color: var(--muted); white-space: nowrap; }
.specialties ul { display: flex; flex-wrap: wrap; gap: 10px 26px; }
.method { border-radius: 32px 32px 0 0; }
.trace-story { display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr); gap: 80px; align-items: start; margin-top: 56px; }
.trace-visual { position: sticky; top: calc(var(--nav-h) + 12px); z-index: var(--z-sticky); background: var(--surface); border: 1px solid var(--stroke-light); border-radius: var(--radius); padding: 20px; }
.trace-visual__head { display: flex; justify-content: space-between; gap: 12px; font-size: 12px; color: var(--muted-light); padding: 0 4px 14px; }
.trace-visual__head > span:last-child { color: var(--light); }
.trace-diagram { width: 100%; height: auto; max-height: 48svh; }
.diagram-grid path { stroke: var(--diagram-grid); fill: none; }
#diagram-grid path { fill: none; stroke: var(--diagram-grid); stroke-width: 1; }
#aggregate circle { fill: var(--diagram-speck); }
#aggregate path { stroke: var(--diagram-speck); }
.diagram-concrete { fill: var(--diagram-concrete); stroke: var(--diagram-edge); stroke-width: 1; }
.diagram-layer { fill: none; stroke: var(--diagram-edge); stroke-width: 5; }
.diagram-top { fill: none; stroke: var(--muted-light); stroke-width: 2; }
.diagram-water { fill: none; stroke: var(--diagram-water); stroke-width: 2; opacity: .65; }
.diagram-zone { fill: var(--muted-light); font-size: 16px; }
.diagram-label { fill: var(--light); font-size: 15px; }
.diagram-stain { fill: var(--signal); opacity: .33; }
.diagram-marker { fill: var(--signal); }
.diagram-leader { fill: none; stroke: var(--muted-light); stroke-width: 1; }
.diagram-check-ring { fill: none; stroke: var(--signal); stroke-width: 1.5; stroke-dasharray: 3 5; }
.diagram-route-line { fill: none; stroke: var(--signal); stroke-width: 4; stroke-linecap: round; stroke-dasharray: 1; stroke-dashoffset: 0; transition: stroke-dashoffset .8s var(--ease); }
.diagram-repair-band { fill: none; stroke: var(--signal); stroke-width: 9; stroke-linejoin: round; }
.diagram-check, .diagram-route, .diagram-repair { transition: opacity .4s; }
.story-ready[data-stage="0"] .diagram-check, .story-ready[data-stage="0"] .diagram-route, .story-ready[data-stage="1"] .diagram-route, .story-ready:not([data-stage="3"]) .diagram-repair { opacity: 0; }
.story-ready[data-stage="0"] .diagram-route-line, .story-ready[data-stage="1"] .diagram-route-line { stroke-dashoffset: 1; }
.trace-controls { display: none; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 4px; margin-top: 12px; }
.story-ready .trace-controls { display: grid; }
.trace-controls button { display: flex; align-items: center; justify-content: center; gap: 7px; min-height: 44px; padding: 10px 5px; border: 1px solid var(--stroke-light); border-radius: 999px; background: transparent; color: var(--muted-light); font-size: 12px; white-space: nowrap; }
.trace-controls button span { font-family: var(--utility-font); font-size: 10px; }
.trace-controls button[aria-pressed="true"] { background: var(--signal); color: var(--ink); border-color: var(--signal); }
.trace-controls button:hover { border-color: var(--signal); }
.trace-disclaimer { color: var(--muted-light); font-size: 11px; margin: 18px 4px 2px; line-height: 1.7; }
.trace-copy-step { display: flex; flex-direction: column; justify-content: center; min-height: 238px; padding-block: 30px; border-bottom: 1px solid var(--stroke-light); }
.trace-copy-step:first-child { padding-top: 0; }
.trace-copy-step:last-child { border: 0; }
.trace-copy-step__number { color: var(--muted-light); font-size: 12px; margin-bottom: 16px; letter-spacing: .06em; }
.trace-copy-step.is-current .trace-copy-step__number { color: var(--signal); }
.trace-copy-step h3 { font-size: clamp(24px, 2.4vw, 34px); line-height: 1.4; }
.trace-copy-step p { color: var(--muted-light); margin-top: 18px; font-size: 14px; max-width: 370px; }
.process-heading { margin-top: 86px; padding-top: 44px; border-top: 1px solid var(--stroke-light); }
.process-heading h3 { font-size: 28px; }
.process-heading p { color: var(--muted-light); margin-top: 10px; font-size: 14px; }
.trace-steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 38px 42px; margin-top: 38px; }
.trace-step { display: flex; gap: 20px; min-width: 0; }
.trace-step__number { font-family: var(--utility-font); color: var(--signal); font-size: 17px; line-height: 1.7; }
.trace-step h3 { font-size: 18px; }
.trace-step p { margin-top: 12px; color: var(--muted-light); font-size: 13px; line-height: 1.8; }
.trace-step small { display: block; margin-top: 15px; color: var(--light); font-size: 11px; }
.method__promise { display: flex; align-items: center; justify-content: space-between; gap: 24px; margin-top: 50px; padding-top: 28px; border-top: 1px solid var(--stroke-light); }
.method__promise p { color: var(--muted-light); font-size: 12px; }
.field-proof { background: var(--mist); }
.field-proof__layout { display: grid; grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr); gap: 72px; align-items: center; }
.field-proof__copy h2 { font-size: clamp(30px, 3vw, 42px); }
.field-proof__copy > p { margin-top: 20px; color: var(--muted); font-size: 14px; }
.equipment-list { margin-top: 28px; display: grid; gap: 17px; }
.equipment-list dt { font-size: 14px; font-weight: 600; }
.equipment-list dd { font-size: 12px; color: var(--muted); margin-top: 2px; }
.equipment-figure { min-width: 0; border-radius: var(--radius); background: var(--card); padding: 25px; }
.equipment-figure img { width: 100%; }
.equipment-figure figcaption { margin-top: 20px; font-size: 11px; color: var(--muted); }
.cases .section-intro { margin-bottom: 60px; }
.project-grid { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: 62px 42px; align-items: start; }
.project-card { grid-column: span 5; min-width: 0; }
.project-card--wide { grid-column: span 7; }
.project-card:nth-child(2), .project-card:nth-child(4) { padding-top: 80px; }
.project-card figure { position: relative; border-radius: var(--radius); overflow: clip; background: var(--mist); }
.project-card figure img { width: 100%; aspect-ratio: 1.14; object-fit: cover; transition: transform .65s var(--ease); }
.project-card--wide figure img { aspect-ratio: 1.48; }
.project-card figure figcaption { position: absolute; bottom: 0; inset-inline: 0; padding: 52px 24px 19px; color: var(--light); font-size: 12px; background: linear-gradient(transparent, var(--photo-dark)); }
.project-card__body { padding-top: 24px; }
.project-card h3 { font-size: clamp(24px, 2.3vw, 32px); }
.project-card__body > p { margin-top: 10px; font-size: 14px; color: var(--muted); }
.project-details { margin-top: 20px; border-bottom: 1px solid var(--stroke); }
.project-details summary { display: flex; justify-content: space-between; align-items: center; min-height: 48px; padding-block: 9px; font-size: 13px; list-style: none; }
summary::-webkit-details-marker { display: none; }
.project-details summary > span, .symptom-examples summary > span:last-child, .honors summary > span { font-size: 24px; font-weight: 300; transition: transform .25s; }
details[open] > summary > span:last-child:not(:first-child), details[open] > summary > i { transform: rotate(45deg); }
.project-details[open] > summary > span, .honors[open] > summary > span { transform: rotate(45deg); }
.project-details dl { padding-bottom: 22px; }
.project-details dl > div { margin-top: 18px; }
.project-details dt { font-size: 12px; font-weight: 600; margin-bottom: 5px; }
.project-details dd { color: var(--muted); font-size: 13px; }
.work-records { margin-top: 64px; border-top: 1px solid var(--stroke); padding-top: 34px; }
.work-records__heading h3 { font-size: 26px; }
.work-records__heading p { color: var(--muted); font-size: 12px; margin-top: 10px; }
.work-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 26px; margin-top: 28px; }
.work-grid img { width: 100%; aspect-ratio: 4 / 5; object-fit: cover; border-radius: var(--radius-small); }
.work-grid figcaption { padding-top: 16px; }
.work-grid figcaption strong { font-size: 15px; }
.work-grid figcaption p { font-size: 12px; color: var(--muted); margin-top: 4px; }
.about__layout { display: grid; grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr); gap: 88px; align-items: center; }
.about__full-name { color: var(--light); font-size: 14px; margin-top: 22px; }
.about__body > p:not(.about__full-name) { color: var(--muted-light); font-size: 15px; margin-top: 25px; line-height: 2; }
.about__values { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 30px; }
.about__values span { padding: 6px 12px; border: 1px solid var(--stroke-light); border-radius: 999px; font-size: 12px; }
.company-facts { margin-top: 26px; font-size: 12px; }
.company-facts > div { display: grid; grid-template-columns: 64px minmax(0, 1fr); gap: 16px; border-top: 1px solid var(--stroke-light); padding-block: 10px; }
.company-facts dt { color: var(--muted-light); }
.team-gallery { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.team-gallery__main { grid-column: 1 / -1; }
.team-gallery img { width: 100%; aspect-ratio: 1.5; object-fit: cover; border-radius: var(--radius-small); }
.team-gallery__main img { aspect-ratio: 4 / 3; object-position: center; }
.team-gallery figcaption { color: var(--muted-light); font-size: 11px; margin-top: 9px; }
.company-timeline { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 32px; margin-top: 72px; border-top: 1px solid var(--stroke-light); padding-top: 30px; }
.company-timeline strong { font-family: var(--utility-font); color: var(--signal); font-size: 40px; font-weight: 400; letter-spacing: -.035em; }
.company-timeline h3 { font-size: 15px; margin-top: 10px; }
.company-timeline p { color: var(--muted-light); font-size: 12px; margin-top: 8px; }
.honors { margin-top: 34px; border-top: 1px solid var(--stroke-light); }
.honors > summary { display: flex; justify-content: space-between; align-items: center; min-height: 62px; font-size: 12px; list-style: none; }
.honors__grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 26px; padding-top: 8px; }
.honors__grid img { width: 100%; aspect-ratio: 1.4; object-fit: contain; border-radius: var(--radius-small); background: var(--surface); }
.honors__grid figcaption { font-size: 11px; margin-top: 10px; color: var(--muted-light); }
.faq__layout { display: grid; grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr); gap: 80px; }
.faq h2 { font-size: clamp(30px, 3vw, 42px); }
.faq__intro { color: var(--muted); font-size: 15px; margin-top: 22px; }
.faq__intro span { display: block; }
.faq-list details { border-top: 1px solid var(--stroke); }
.faq-list details:last-child { border-bottom: 1px solid var(--stroke); }
.faq-list summary { display: flex; align-items: center; justify-content: space-between; gap: 24px; min-height: 76px; font-size: 15px; list-style: none; }
.faq-list summary i { font-size: 24px; font-style: normal; font-weight: 300; flex-shrink: 0; transition: transform .25s; }
.faq-list details > p { color: var(--muted); padding-bottom: 26px; font-size: 14px; }
.contact { background: var(--mist); border-radius: 32px 32px 0 0; }
.contact__layout { display: grid; grid-template-columns: minmax(0, .88fr) minmax(0, 1.12fr); gap: 85px; }
.contact__copy > p { margin-top: 24px; max-width: 330px; color: var(--muted); font-size: 15px; }
.contact address { font-style: normal; margin-top: 45px; display: grid; gap: 10px; }
.contact address > span, .contact__channel > span { color: var(--muted); font-size: 12px; }
.contact address strong { font-size: 15px; font-weight: 500; max-width: 280px; }
.contact__channel { margin-top: 26px; }
.contact__channel p { margin-top: 8px; font-size: 14px; }
.contact__phone { display: flex; align-items: center; justify-content: space-between; gap: 20px; min-height: 52px; width: fit-content; max-width: 100%; font-family: var(--utility-font); font-size: clamp(24px, 2.5vw, 32px); letter-spacing: -.02em; }
.contact__phone > span { font-size: 24px; color: var(--signal-deep); }
.contact__phone:hover { text-decoration: underline; text-underline-offset: 6px; }
.contact-form { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; min-width: 0; }
.contact-form__head { grid-column: 1 / -1; margin-bottom: 8px; }
.contact-form__head h3 { font-size: 23px; }
.contact-form__head p { font-size: 12px; color: var(--muted); margin-top: 8px; }
.contact-form label { min-width: 0; display: flex; flex-direction: column; gap: 8px; }
.contact-form label > span { font-size: 13px; }
.contact-form input, .contact-form select, .contact-form textarea { width: 100%; min-width: 0; min-height: 49px; border: 1px solid var(--stroke); border-radius: var(--radius-small); background: var(--card); color: var(--ink); padding: 12px 14px; font-size: 14px; }
.contact-form textarea { resize: vertical; min-height: 112px; }
.contact-form ::placeholder { color: var(--muted); opacity: 1; }
.contact-form [aria-invalid="true"] { border-color: var(--signal-deep); }
.contact-form__full, .contact-form__submit, .contact-form__feedback, .consult-result { grid-column: 1 / -1; }
.contact-form__submit { margin-top: 2px; }
.field-error { min-height: 0; color: var(--signal-deep); font-size: 12px; }
.field-error:empty { display: none; }
.contact-form__feedback { font-size: 12px; color: var(--muted); }
.contact-form__feedback:empty { display: none; }
.consult-result { background: var(--card); border: 1px solid var(--stroke); padding: 22px; border-radius: var(--radius-small); }
.consult-result > strong { font-size: 14px; }
.consult-result > p { white-space: pre-wrap; overflow-wrap: anywhere; font-size: 13px; margin-block: 14px; }
.site-footer { padding-top: 58px; background: var(--ink); color: var(--light); }
.footer-statement { font-size: clamp(32px, 6.2vw, 90px); letter-spacing: -.055em; line-height: 1.3; font-weight: 500; padding-bottom: 55px; }
.site-footer__inner { display: flex; justify-content: space-between; align-items: center; gap: 30px; padding-block: 32px; border-top: 1px solid var(--stroke-light); }
.site-footer__inner p { color: var(--muted-light); font-size: 12px; }
.site-footer__inner p span { display: block; margin-top: 4px; }
.footer-top { display: inline-flex; align-items: center; gap: 20px; min-height: 44px; font-size: 12px; white-space: nowrap; }
.footer-top > span { color: var(--signal); font-size: 23px; }
.site-footer__bottom { display: flex; justify-content: space-between; gap: 20px; padding-block: 24px; border-top: 1px solid var(--stroke-light); color: var(--muted-light); font-size: 10px; }
.footer-phones { display: flex; flex-wrap: wrap; gap: 6px 22px; }
.footer-phones a { display: inline-flex; align-items: center; min-height: 44px; font-family: var(--utility-font); font-size: 14px; }
.site-footer__bottom > p:first-child { align-self: center; }
.footer-filing { display: inline-flex; align-items: center; min-height: 44px; white-space: nowrap; font-size: 11px; }
.footer-filing:hover { color: var(--light); text-decoration: underline; }
@media (hover: hover) and (pointer: fine) {
  .project-card figure:hover img { transform: scale(1.025); }
}
@media (max-width: 1100px) {
  .site-nav a { padding-inline: 11px; }
  .site-header__inner { gap: 14px; }
  .scene-tab { font-size: 12px; }
  .scene-tab small { font-size: 9px; }
  .trace-story { gap: 44px; }
  .field-proof__layout, .about__layout, .faq__layout, .contact__layout { gap: 44px; }
}
@media (max-width: 900px) {
  :root { --nav-h: 94px; --gutter: 32px; }
  .site-header { top: 14px; }
  .site-header__inner { height: 64px; width: calc(100% - 32px); padding: 9px 10px 9px 18px; }
  .menu-toggle { display: block; }
  .site-nav { display: none; position: absolute; top: 76px; right: 16px; left: 16px; padding: 12px; border-radius: var(--radius); background: var(--ink); border: 1px solid var(--stroke-light); box-shadow: var(--shadow); }
  .site-nav.is-open { display: grid; grid-template-columns: minmax(0, 1fr); }
  .site-nav a { padding: 14px 18px; font-size: 15px; }
  .site-nav .site-nav__cta { justify-content: space-between; margin-top: 8px; }
  .scene-tabs { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .scene-tab { font-size: 14px; }
  .scene-tab small { font-size: 10px; }
  .scene-panel { grid-template-columns: minmax(0, 1fr); }
  .scene-panel__image { min-height: 0; }
  .scene-panel__image img { position: relative; height: auto; max-height: 440px; aspect-ratio: 1.65; }
  .scene-panel__copy { padding: 30px; }
  .trace-story { grid-template-columns: minmax(0, 1fr); gap: 24px; margin-top: 36px; }
  .trace-visual { position: static; }
  .trace-diagram { max-height: 420px; }
  .trace-copy { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px; }
  .trace-copy-step, .trace-copy-step:first-child { min-height: 0; padding-top: 20px; justify-content: flex-start; }
  .trace-copy-step h3 { font-size: 24px; }
  .trace-copy-step p { font-size: 13px; }
  .trace-steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .process-heading { margin-top: 46px; }
  .field-proof__layout { grid-template-columns: minmax(0, 1fr); gap: 34px; }
  .equipment-list { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .project-grid { gap: 45px 28px; }
  .project-card:nth-child(2), .project-card:nth-child(4) { padding-top: 48px; }
  .project-card figure figcaption { padding-inline: 16px; font-size: 10px; }
  .about__layout { gap: 38px; grid-template-columns: minmax(0, 1fr); }
  .about__body > p { max-width: 640px; }
  .team-gallery { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .team-gallery__main { grid-column: 1 / -1; grid-row: auto; }
  .team-gallery > figure:not(.team-gallery__main) { grid-column: auto; }
  .company-timeline { margin-top: 48px; gap: 20px; }
  .company-timeline strong { font-size: 32px; }
  .faq__layout, .contact__layout { grid-template-columns: minmax(0, 1fr); gap: 35px; }
  .faq__intro span { display: inline; }
  .contact address { margin-top: 26px; }
  .contact__copy { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: 32px; }
  .contact__copy h2, .contact__copy > p { grid-column: 1 / -1; }
  .contact__copy > p { max-width: 540px; }
  .site-footer__inner { flex-wrap: wrap; }
  .site-footer__inner p { order: 3; flex-basis: 100%; }
}
@media (max-width: 560px) {
  :root { --gutter: 20px; --radius: 16px; --radius-small: 10px; --nav-h: 90px; }
  body { font-size: 15px; }
  .section { padding-block: 65px; }
  .section-intro { margin-bottom: 30px; }
  .section-intro > p:not(.section-label) { font-size: 14px; margin-top: 15px; }
  .section-label { margin-bottom: 18px; font-size: 12px; }
  .brand { gap: 9px; }
  .brand__logo { width: 170px; height: 44px; }
  .site-header__inner { width: calc(100% - 24px); height: 60px; padding-left: 14px; }
  .site-header { top: 12px; }
  .site-nav { top: 72px; inset-inline: 12px; }
  .hero { min-height: clamp(660px, 100svh, 880px); }
  .hero__content { padding-top: 112px; padding-bottom: 42px; }
  .hero__photo img { object-position: 63% center; opacity: .6; }
  .hero h1 { font-size: clamp(42px, 10.8vw, 61px); line-height: 1.22; }
  .hero__credential { font-size: 10px; margin-bottom: 24px; gap: 7px; letter-spacing: 0; }
  .hero__lead { font-size: 11px; letter-spacing: 0; margin-top: 23px; }
  .hero__actions { gap: 10px; margin-top: 28px; }
  .hero__hotline { display: grid; grid-template-columns: auto auto; column-gap: 18px; row-gap: 0; margin-top: 18px; }
  .hero__hotline > span { grid-column: 1 / -1; font-size: 10px; }
  .hero__hotline a { font-size: 13px; }
  .button { padding: 12px 18px; min-height: 50px; font-size: 12px; gap: 18px; }
  .button > span { font-size: 20px; }
  .hero__foot { grid-template-columns: minmax(0, 1fr) auto; gap: 14px; padding-block: 20px 25px; font-size: 10px; }
  .hero__since { display: none; }
  .hero__scroll { gap: 12px; }
  .hero__scroll > span:last-child { font-size: 23px; }
  .scene-tabs { gap: 6px; margin-bottom: 16px; }
  .scene-tab { min-height: 48px; padding: 11px 3px; font-size: 11px; }
  .scene-tab small { display: none; }
  .scene-panel__image img { aspect-ratio: 1.27; }
  .scene-panel__image figcaption { font-size: 9px; padding-inline: 16px; }
  .scene-panel__copy { padding: 24px 22px; }
  .scene-panel__count { margin-bottom: 10px; }
  .scene-panel h3 { font-size: 27px; margin-bottom: 15px; }
  .scene-panel__lead { font-size: 14px; }
  .scene-panel__list { margin-block: 20px; font-size: 12px; }
  .scene-panel__list > div { gap: 8px; }
  .specialties { gap: 16px; }
  .specialties ul { gap: 8px 18px; font-size: 11px; }
  .section-note { font-size: 11px; line-height: 1.8; }
  .method, .contact { border-radius: 24px 24px 0 0; }
  .trace-story { margin-top: 30px; }
  .trace-visual { padding: 12px; }
  .trace-visual__head { font-size: 10px; padding-bottom: 10px; }
  .diagram-label { font-size: 23px; }
  .diagram-zone { font-size: 23px; }
  .trace-controls { gap: 4px; margin-top: 8px; }
  .trace-controls button { gap: 4px; font-size: 11px; }
  .trace-controls button span { font-size: 9px; }
  .trace-disclaimer { font-size: 10px; margin-top: 14px; }
  .trace-copy { grid-template-columns: minmax(0, 1fr); gap: 0; }
  .trace-copy-step, .trace-copy-step:first-child { padding-block: 28px; }
  .trace-copy-step h3 { font-size: 26px; }
  .trace-copy-step h3 br { display: none; }
  .trace-copy-step__number { margin-bottom: 10px; }
  .trace-copy-step p { margin-top: 12px; }
  .process-heading { margin-top: 22px; padding-top: 30px; }
  .process-heading h3 { font-size: 26px; }
  .process-heading p { font-size: 12px; }
  .trace-steps { gap: 28px 18px; }
  .trace-step { display: block; }
  .trace-step__number { display: block; font-size: 14px; margin-bottom: 9px; }
  .trace-step h3 { font-size: 16px; }
  .trace-step p { font-size: 12px; margin-top: 9px; }
  .trace-step small { font-size: 10px; }
  .method__promise { flex-direction: column; align-items: flex-start; gap: 14px; margin-top: 32px; }
  .method__promise p { font-size: 10px; }
  .equipment-list { grid-template-columns: minmax(0, 1fr); gap: 18px; }
  .equipment-figure { padding: 16px; }
  .equipment-figure figcaption { font-size: 10px; margin-top: 12px; }
  .cases .section-intro { margin-bottom: 36px; }
  .project-grid { grid-template-columns: minmax(0, 1fr); gap: 42px; }
  .project-card, .project-card--wide { grid-column: auto; }
  .project-card:nth-child(2), .project-card:nth-child(4) { padding-top: 0; }
  .project-card figure img, .project-card--wide figure img { aspect-ratio: 1.24; }
  .project-card__body { padding-top: 18px; }
  .project-card h3 { font-size: 26px; }
  .project-card__body > p { font-size: 13px; }
  .project-details { margin-top: 12px; }
  .work-records { margin-top: 40px; padding-top: 28px; }
  .work-records__heading h3 { font-size: 24px; }
  .work-grid { grid-template-columns: minmax(0, 1fr); gap: 28px; }
  .work-grid img { aspect-ratio: 1.1; object-position: center 40%; }
  .about__body > p:not(.about__full-name) { font-size: 14px; }
  .about__full-name { font-size: 12px; }
  .about__values { gap: 6px; }
  .about__values span { padding: 5px 9px; font-size: 10px; }
  .team-gallery { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px 12px; }
  .team-gallery__main { grid-column: 1 / -1; grid-row: auto; }
  .team-gallery > figure:not(.team-gallery__main) { grid-column: auto; }
  .team-gallery__main img { aspect-ratio: 4 / 3; }
  .team-gallery figcaption { font-size: 10px; }
  .company-timeline { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px 20px; margin-top: 40px; }
  .company-timeline strong { font-size: 36px; }
  .company-timeline h3 { font-size: 13px; }
  .company-timeline p { font-size: 11px; }
  .honors__grid { grid-template-columns: minmax(0, 1fr); gap: 22px; }
  .faq-list summary { font-size: 14px; min-height: 70px; gap: 15px; }
  .faq-list details > p { font-size: 13px; }
  .contact__copy { grid-template-columns: minmax(0, 1fr); gap: 0; }
  .contact__copy > p { font-size: 14px; }
  .contact address strong { font-size: 14px; max-width: none; }
  .contact__channel p { font-size: 13px; }
  .contact-form { gap: 17px 12px; }
  .contact-form__head h3 { font-size: 22px; }
  .contact-form__head p { font-size: 11px; }
  .contact-form label > span { font-size: 12px; }
  .contact-form input, .contact-form select, .contact-form textarea { padding: 11px; font-size: 16px; }
  .contact-form__submit .button { width: 100%; justify-content: space-between; padding-inline: 22px; font-size: 14px; }
  .site-footer { padding-top: 40px; }
  .footer-statement { font-size: clamp(30px, 7.8vw, 43px); padding-bottom: 37px; }
  .site-footer__inner { gap: 25px; padding-block: 27px; }
  .site-footer__inner p { font-size: 10px; }
  .site-footer__bottom { flex-direction: column; gap: 4px; padding-block: 20px; font-size: 10px; }
  .site-footer__bottom > p:first-child { align-self: flex-start; }
}
@media (max-width: 350px) {
  :root { --gutter: 16px; }
  .hero__actions .button { padding-inline: 14px; gap: 11px; }
  .hero__foot { font-size: 9px; gap: 10px; }
  .scene-tab { font-size: 10px; }
  .scene-panel__image figcaption > span:first-child { display: none; }
  .scene-panel__copy { padding: 22px 18px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-delay: 0ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .hero h1 > span, .hero__photo img { animation: none; opacity: 1; transform: none; }
  .hero__photo img { opacity: .65; }
  .trace-visual { position: static; }
  .trace-story .diagram-check, .trace-story .diagram-route, .trace-story .diagram-repair { opacity: 1 !important; }
  .trace-story .diagram-route-line { stroke-dashoffset: 0 !important; }
}
@media (prefers-reduced-transparency: reduce) {
  .site-header__inner, .button--outline { background: var(--ink); }
}
.no-js .trace-controls { display: none; }
.no-js .scene-tabs { display: none; }
.no-js .scene-panel[hidden] { display: grid !important; margin-top: 24px; }
.no-js .contact-form { display: none; }
@media (max-width: 900px) {
  .no-js .site-header { position: static; background: var(--ink); padding: 12px 0; }
  .no-js .site-header__inner { flex-wrap: wrap; height: auto; border-radius: var(--radius); }
  .no-js .site-nav { position: static; display: flex; flex-wrap: wrap; border: 0; box-shadow: none; padding: 0; }
  .no-js .menu-toggle { display: none; }
}