:root {
	--color-bg: #f1f2ef;
	--color-surface: #ffffff;
	--color-surface-soft: #e5e9e7;
	--color-text: #17201e;
	--color-muted: #66716e;
	--color-brand: #165c68;
	--color-brand-dark: #103f49;
	--color-accent: #db6c35;
	--color-border: #c9d0cd;
	--color-dark: #13201f;
	--color-light: #f8faf8;
	--font-main: "Noto Sans TC", sans-serif;
	--container-width: 1280px;
	--header-height: 88px;
	--section-space: 132px;
	--transition-fast: 220ms ease;
	--transition-base: 520ms cubic-bezier(0.2, 0.72, 0.2, 1);
	--shadow-soft: 0 20px 60px rgba(17, 31, 29, 0.1);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body { margin: 0; overflow-x: hidden; background: var(--color-bg); color: var(--color-text); font-family: var(--font-main); line-height: 1.75; -webkit-font-smoothing: antialiased; }
body.is-menu-open { overflow: hidden; }

img { display: block; width: 100%; max-width: 100%; }

a { color: inherit; text-decoration: none; }

p { margin: 0; overflow-wrap: anywhere; }

ul { margin: 0; padding: 0; list-style: none; }

figure { margin: 0; }

h1, h2, h3, h4 { margin: 0; line-height: 1.2; overflow-wrap: anywhere; }

.skip-link { position: fixed; top: -80px; left: 20px; z-index: 1000; padding: 12px 18px; background: var(--color-accent); color: #ffffff; font-weight: 700; transition: top var(--transition-fast); }
.skip-link:focus { top: 16px; }

.site-container { width: min(calc(100% - 80px), var(--container-width)); margin: 0 auto; }

.eyebrow { display: flex; align-items: center; gap: 14px; color: var(--color-brand); font-size: 13px; font-weight: 800; letter-spacing: 0.14em; }
.eyebrow::before { width: 42px; height: 2px; background: currentColor; content: ""; }
.text-link { display: inline-flex; align-items: center; gap: 12px; padding-bottom: 5px; border-bottom: 1px solid currentColor; color: var(--color-brand-dark); font-size: 15px; font-weight: 700; transition: gap var(--transition-fast), color var(--transition-fast); }

.text-link::after { content: "↗"; font-size: 14px; }
.text-link:hover, .text-link:focus-visible { gap: 18px; color: var(--color-accent); }

.primary-link { display: inline-flex; align-items: center; justify-content: center; min-height: 54px; padding: 0 25px; border: 1px solid var(--color-accent); background: var(--color-accent); color: #ffffff; font-size: 15px; font-weight: 800; letter-spacing: 0.03em; transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast); }
.primary-link:hover, .primary-link:focus-visible { background: transparent; color: var(--color-accent); transform: translateY(-2px); }

.secondary-link { display: inline-flex; align-items: center; justify-content: center; min-height: 54px; padding: 0 25px; border: 1px solid rgba(255, 255, 255, 0.7); color: #ffffff; font-size: 15px; font-weight: 700; transition: background var(--transition-fast), color var(--transition-fast); }
.secondary-link:hover, .secondary-link:focus-visible { background: #ffffff; color: var(--color-dark); }

.reveal-mask { clip-path: inset(0 100% 0 0); transition: clip-path 1s cubic-bezier(0.2, 0.7, 0.1, 1); }
.reveal-mask.is-visible { clip-path: inset(0 0 0 0); }
.reveal-shift { opacity: 0; transform: translateY(34px); transition: opacity var(--transition-base), transform var(--transition-base); }
.reveal-shift.is-visible { opacity: 1; transform: translateY(0); }

/* header */
header { position: fixed; top: 0; left: 0; z-index: 100; width: 100%; height: var(--header-height); border-bottom: 1px solid rgba(255, 255, 255, 0.24); color: #ffffff; transition: height var(--transition-fast), background var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast); }
header.is-scrolled { height: 72px; border-bottom-color: transparent; background: rgba(248, 250, 248, 0.96); box-shadow: 0 8px 26px rgba(17, 31, 29, 0.08); color: var(--color-text); backdrop-filter: blur(12px); }
header .header-container { display: flex; align-items: center; justify-content: space-between; width: min(calc(100% - 80px), 1440px); height: 100%; margin: 0 auto; }
header h1 { font-size: 19px; font-weight: 900; letter-spacing: 0.05em; }
header .brand-link { display: flex; align-items: center; gap: 14px; }
header .brand-mark { position: relative; display: block; width: 37px; height: 37px; background: url(../image/brand_light.webp) no-repeat 50% / cover; }
header.is-scrolled .brand-mark { background-image: url(../image/brand_dark.webp); }
header .header-right { display: flex; align-items: center; gap: 42px; }
header .nav-list { display: flex; align-items: center; gap: 34px; }
header .nav-item a { position: relative; display: block; padding: 8px 0; font-size: 14px; font-weight: 700; letter-spacing: 0.04em; }
header .nav-item a::after { position: absolute; right: 0; bottom: 2px; left: 0; height: 2px; background: var(--color-accent); content: ""; transform: scaleX(0); transform-origin: right; transition: transform var(--transition-fast); }
header .nav-item a:hover::after, header .nav-item a:focus-visible::after { transform: scaleX(1); transform-origin: left; }
header .header-action { display: flex; align-items: center; gap: 11px; padding: 10px 15px; border: 1px solid currentColor; font-size: 13px; font-weight: 800; transition: background var(--transition-fast), color var(--transition-fast); }
header .header-action::after { content: "→"; }
header .header-action:hover, header .header-action:focus-visible { background: currentColor; color: var(--color-brand-dark); }
header.is-scrolled .header-action:hover, header.is-scrolled .header-action:focus-visible { background: var(--color-brand-dark); color: #ffffff; }
header .menu-toggle { display: none; width: 44px; height: 44px; border: 1px solid currentColor; }
header .menu-toggle-lines { position: relative; display: block; width: 20px; height: 14px; margin: 14px auto; }
header .menu-toggle-lines::before, header .menu-toggle-lines::after { position: absolute; left: 0; width: 20px; height: 2px; background: currentColor; content: ""; transition: top var(--transition-fast), transform var(--transition-fast); }
header .menu-toggle-lines::before { top: 2px; }
header .menu-toggle-lines::after { top: 10px; }
header .menu-toggle.is-active { color: #fff; }
header .menu-toggle.is-active .menu-toggle-lines::before { top: 6px; transform: rotate(45deg); }
header .menu-toggle.is-active .menu-toggle-lines::after { top: 6px; transform: rotate(-45deg); }

/* hero */
#hero-section { position: relative; display: flex; align-items: flex-end; min-height: 790px; padding: calc(var(--header-height) + 72px) 0 72px; overflow: hidden; background: var(--color-dark); color: #ffffff; isolation: isolate; }
#hero-section::before { position: absolute; inset: 0; z-index: -3; background-image: url(../image/hero-ventilation-engineering.webp); background-position: center 46%; background-size: cover; content: ""; transform: scale(1.04); transition: transform 7s cubic-bezier(0.2, 0.7, 0.2, 1); }
#hero-section.is-active::before { transform: scale(1); }
#hero-section::after { position: absolute; inset: 0; z-index: -2; background: linear-gradient( 90deg, rgba(11, 25, 24, 0.92) 0%, rgba(11, 25, 24, 0.7) 43%, rgba(11, 25, 24, 0.18) 76% ), linear-gradient(0deg, rgba(11, 25, 24, 0.72), transparent 58%); content: ""; }
#hero-section .hero-grid { display: grid; grid-template-columns: minmax(0, 1.55fr) minmax(280px, 0.65fr); align-items: end; gap: 80px; }
#hero-section .hero-content { max-width: 780px; }
#hero-section .hero-kicker { display: flex; align-items: center; gap: 16px; margin-bottom: 28px; color: #d8e8e6; font-size: 14px; font-weight: 700; letter-spacing: 0.18em; }
#hero-section .hero-kicker::before { width: 52px; height: 2px; background: var(--color-accent); content: ""; }
#hero-section .hero-title { max-width: 750px; font-size: clamp(46px, 6.1vw, 88px); font-weight: 900; letter-spacing: -0.055em; line-height: 1.08; text-wrap: balance; }
#hero-section .hero-title span { color: #a8d6d8; }
#hero-section .hero-bottom { display: grid; grid-template-columns: minmax(0, 480px) auto; align-items: end; gap: 42px; margin-top: 34px; }
#hero-section .hero-text { color: rgba(255, 255, 255, 0.82); font-size: 17px; line-height: 1.9; }
#hero-section .hero-actions { display: flex; gap: 12px; white-space: nowrap; }
#hero-section .hero-panel { border-top: 4px solid var(--color-accent); background: rgba(15, 37, 36, 0.88); box-shadow: var(--shadow-soft); backdrop-filter: blur(8px); }
#hero-section .hero-panel-header { padding: 23px 26px 20px; border-bottom: 1px solid rgba(255, 255, 255, 0.16); }
#hero-section .hero-panel-label { color: #a8d6d8; font-size: 12px; font-weight: 800; letter-spacing: 0.13em; }
#hero-section .hero-panel-title { margin-top: 6px; font-size: 21px; font-weight: 800; }
#hero-section .hero-panel-list { padding: 6px 26px 12px; }
#hero-section .hero-panel-item { display: grid; grid-template-columns: 40px 1fr; gap: 15px; padding: 18px 0; border-bottom: 1px solid rgba(255, 255, 255, 0.14); }
#hero-section .hero-panel-item:last-child { border-bottom: 0; }
#hero-section .hero-panel-number { color: var(--color-accent); font-size: 12px; font-weight: 900; letter-spacing: 0.08em; }
#hero-section .hero-panel-name { font-size: 15px; font-weight: 700; }
#hero-section .hero-panel-note { margin-top: 3px; color: rgba(255, 255, 255, 0.58); font-size: 12px; }
#hero-section .scroll-cue { position: absolute; right: 28px; bottom: 30px; display: flex; align-items: center; gap: 14px; color: rgba(255, 255, 255, 0.68); font-size: 11px; font-weight: 700; letter-spacing: 0.18em; writing-mode: vertical-rl; }
#hero-section .scroll-cue::after { width: 1px; height: 54px; background: rgba(255, 255, 255, 0.5); content: ""; }

/* scope */
#scope-section { padding: var(--section-space) 0 0; background: var(--color-bg); }
#scope-section .scope-heading { display: grid; grid-template-columns: 280px minmax(0, 1fr); gap: 70px; padding-bottom: 86px; }
#scope-section .scope-title { max-width: 850px; font-size: clamp(34px, 4vw, 59px); font-weight: 800; letter-spacing: -0.045em; }
#scope-section .scope-title em { color: var(--color-brand); font-style: normal; }
#scope-section .scope-intro { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; margin-top: 36px; }
#scope-section .scope-text { color: var(--color-muted); font-size: 16px; }
#scope-section .scope-list { border-top: 1px solid var(--color-text); }
#scope-section .scope-item { position: relative; display: grid; grid-template-columns: 90px minmax(200px, 0.72fr) minmax(0, 1fr) 130px; align-items: center; gap: 30px; min-height: 148px; border-bottom: 1px solid var(--color-border); transition: color var(--transition-fast); }
#scope-section .scope-item::before { position: absolute; inset: 0; z-index: 0; background: var(--color-brand); content: ""; transform: scaleY(0); transform-origin: bottom; transition: transform var(--transition-base); }
#scope-section .scope-item > * { position: relative; z-index: 1; }
#scope-section .scope-item:hover, #scope-section .scope-item:focus-within { color: #ffffff; }
#scope-section .scope-item:hover::before, #scope-section .scope-item:focus-within::before { transform: scaleY(1); }
#scope-section .scope-number { color: var(--color-accent); font-size: 13px; font-weight: 900; letter-spacing: 0.1em; }
#scope-section .scope-name { font-size: 25px; font-weight: 800; }
#scope-section .scope-description { color: var(--color-muted); font-size: 15px; transition: color var(--transition-fast); }
#scope-section .scope-item:hover .scope-description, #scope-section .scope-item:focus-within .scope-description { color: rgba(255, 255, 255, 0.75); }
#scope-section .scope-tag { justify-self: end; padding: 6px 0; border-bottom: 1px solid currentColor; font-size: 12px; font-weight: 700; letter-spacing: 0.08em; }
#scope-section .scope-tag::after { margin-left: 10px; content: "↗"; }

/* space */
#space-section { padding: var(--section-space) 0; }
#space-section .space-stage { position: relative; min-height: 760px; overflow: hidden; background-image: url(../image/commercial-airflow-planning.webp); background-position: center; background-size: cover; }
#space-section .space-stage::before { position: absolute; inset: 0; background: linear-gradient( 90deg, rgba(13, 29, 28, 0.18), rgba(13, 29, 28, 0.02) 62%, rgba(13, 29, 28, 0.45) ); content: ""; }
#space-section .space-heading { position: absolute; top: 0; left: 0; z-index: 2; width: min(48%, 630px); padding: 55px 60px 62px; background: var(--color-light); }
#space-section .space-title { margin-top: 22px; font-size: clamp(36px, 4.1vw, 62px); font-weight: 800; letter-spacing: -0.045em; }
#space-section .space-text { max-width: 490px; margin-top: 24px; color: var(--color-muted); font-size: 16px; }
#space-section .space-index { position: absolute; right: 0; bottom: 0; z-index: 2; width: min(42%, 520px); background: var(--color-dark); color: #ffffff; }
#space-section .space-item { display: grid; grid-template-columns: 98px 1fr auto; align-items: center; min-height: 112px; padding: 22px 34px; border-bottom: 1px solid rgba(255, 255, 255, 0.16); transition: background var(--transition-fast); }
#space-section .space-item:last-child { border-bottom: 0; }
#space-section .space-item:hover { background: var(--color-brand); }
#space-section .space-number { color: var(--color-accent); font-size: 12px; font-weight: 900; }
#space-section .space-name { font-size: 20px; font-weight: 800; }
#space-section .space-note { color: rgba(255, 255, 255, 0.6); font-size: 12px; font-weight: 500; }
#space-section .space-arrow { width: 34px; height: 34px; border: 1px solid rgba(255, 255, 255, 0.42); line-height: 30px; text-align: center; transition: border-color var(--transition-fast), transform var(--transition-fast); }
#space-section .space-item:hover .space-arrow { border-color: #ffffff; transform: translateX(5px); }
#space-section .space-caption { position: absolute; bottom: 26px; left: 28px; z-index: 2; padding: 10px 13px; background: rgba(255, 255, 255, 0.86); color: var(--color-dark); font-size: 11px; font-weight: 700; letter-spacing: 0.05em; backdrop-filter: blur(6px); }

/* process */
#process-section { padding: var(--section-space) 0; background: var(--color-surface); }
#process-section .process-layout { display: grid; grid-template-columns: minmax(300px, 0.7fr) minmax(0, 1.3fr); gap: 110px; }
#process-section .process-left { align-self: start; }
#process-section .process-title { margin-top: 22px; font-size: clamp(38px, 4.3vw, 65px); font-weight: 800; letter-spacing: -0.05em; }
#process-section .process-summary { max-width: 430px; margin-top: 28px; color: var(--color-muted); font-size: 16px; }
#process-section .process-note { display: grid; grid-template-columns: 50px 1fr; gap: 18px; margin-top: 54px; padding-top: 22px; border-top: 1px solid var(--color-border); }
#process-section .process-note-mark { display: flex; align-items: center; justify-content: center; width: 42px; height: 42px; border: 1px solid var(--color-accent); color: var(--color-accent); font-weight: 900; }
#process-section .process-note-title { font-size: 15px; font-weight: 800; }
#process-section .process-note-text { margin-top: 5px; color: var(--color-muted); font-size: 13px; }
#process-section .process-list { position: relative; border-top: 1px solid var(--color-text); }
#process-section .process-list::before { position: absolute; top: 0; bottom: 0; left: 49px; width: 1px; background: var(--color-border); content: ""; }
#process-section .process-item { position: relative; display: grid; grid-template-columns: 100px 220px minmax(0, 1fr); gap: 28px; min-height: 156px; padding: 34px 0; border-bottom: 1px solid var(--color-border); }
#process-section .process-step { position: relative; z-index: 1; display: flex; align-items: center; justify-content: center; width: 54px; height: 54px; margin-left: 22px; border: 1px solid var(--color-brand); background: var(--color-surface); color: var(--color-brand); font-size: 13px; font-weight: 900; transition: background var(--transition-fast), color var(--transition-fast); }
#process-section .process-item:hover .process-step { background: var(--color-brand); color: #ffffff; }
#process-section .process-name { padding-top: 11px; font-size: 21px; font-weight: 800; }
#process-section .process-description { padding-top: 8px; color: var(--color-muted); font-size: 15px; }
#process-section .process-detail { display: block; margin-top: 8px; color: var(--color-brand); font-size: 12px; font-weight: 800; letter-spacing: 0.05em; }
#project-section { padding: var(--section-space) 0; background: var(--color-dark); color: #ffffff; }
#project-section .project-header { display: grid; grid-template-columns: minmax(0, 1fr) 370px; align-items: end; gap: 60px; margin-bottom: 65px; }
#project-section .project-title { max-width: 740px; margin-top: 20px; font-size: clamp(39px, 4.8vw, 70px); font-weight: 800; letter-spacing: -0.05em; }
#project-section .project-header-text { padding-bottom: 8px; color: rgba(255, 255, 255, 0.6); font-size: 15px; }
#project-section .project-grid { display: grid; grid-template-columns: 1.2fr 0.8fr; grid-template-rows: 370px 370px; gap: 20px; }
#project-section .project-item { position: relative; overflow: hidden; background: #263130; }
#project-section .project-item:first-child { grid-row: 1 / 3; }
#project-section .project-image { height: 100%; object-fit: cover; transition: transform 1s cubic-bezier(0.2, 0.7, 0.2, 1), filter var(--transition-base); }
#project-section .project-item:hover .project-image { filter: brightness(0.72); transform: scale(1.04); }
#project-section .project-caption { position: absolute; right: 0; bottom: 0; left: 0; padding: 70px 28px 25px; background: linear-gradient(0deg, rgba(8, 18, 17, 0.9), transparent); }
#project-section .project-type { color: #a8d6d8; font-size: 11px; font-weight: 800; letter-spacing: 0.12em; }
#project-section .project-name { display: flex; align-items: flex-end; justify-content: space-between; gap: 20px; margin-top: 8px; font-size: 21px; font-weight: 800; }
#project-section .project-name::after { width: 36px; height: 36px; border: 1px solid rgba(255, 255, 255, 0.55); content: "↗"; flex: 0 0 auto; font-size: 13px; line-height: 32px; text-align: center; }
#project-section .project-item:first-child .project-name { font-size: 29px; }
#project-section .project-footer { display: flex; justify-content: flex-end; margin-top: 36px; }
#project-section .project-footer .text-link { color: #ffffff; }

/* quality */
#quality-section { padding: var(--section-space) 0; overflow: hidden; background: var(--color-surface-soft); }
#quality-section .quality-layout { display: grid; grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr); gap: 100px; }
#quality-section .quality-title { margin-top: 22px; font-size: clamp(40px, 4.6vw, 68px); font-weight: 800; letter-spacing: -0.05em; }
#quality-section .quality-title span { display: block; color: var(--color-brand); }
#quality-section .quality-text { max-width: 470px; margin-top: 28px; color: var(--color-muted); }
#quality-section .quality-rule { width: 0; height: 5px; margin-top: 55px; background: var(--color-accent); transition: width 1.3s cubic-bezier(0.2, 0.7, 0.2, 1); }
#quality-section .quality-rule.is-visible { width: min(100%, 390px); }
#quality-section .quality-list { border-top: 1px solid var(--color-text); }
#quality-section .quality-item { display: grid; grid-template-columns: 125px minmax(150px, 0.75fr) minmax(0, 1fr); gap: 26px; padding: 31px 0; border-bottom: 1px solid var(--color-border); }
#quality-section .quality-unit { color: var(--color-brand); font-size: 25px; font-weight: 900; letter-spacing: -0.03em; }
#quality-section .quality-name { font-size: 18px; font-weight: 800; }
#quality-section .quality-description { color: var(--color-muted); font-size: 14px; }
#quality-section .quality-band { display: grid; grid-template-columns: repeat(4, 1fr); margin-top: 90px; border-top: 1px solid var(--color-border); border-left: 1px solid var(--color-border); background: rgba(255, 255, 255, 0.35); }
#quality-section .quality-band-item { min-height: 148px; padding: 28px; border-right: 1px solid var(--color-border); border-bottom: 1px solid var(--color-border); }
#quality-section .quality-band-label { color: var(--color-muted); font-size: 11px; font-weight: 800; letter-spacing: 0.12em; }
#quality-section .quality-band-value { margin-top: 19px; font-size: 19px; font-weight: 800; }

/* faq */
#faq-section { padding: var(--section-space) 0; background: var(--color-bg); }
#faq-section .faq-layout { display: grid; grid-template-columns: 320px minmax(0, 1fr); gap: 90px; }
#faq-section .faq-title { margin-top: 20px; font-size: 47px; font-weight: 800; letter-spacing: -0.04em; }
#faq-section .faq-lead { margin-top: 22px; color: var(--color-muted); font-size: 14px; }
#faq-section .faq-list { border-top: 1px solid var(--color-text); }
#faq-section .faq-item { border-bottom: 1px solid var(--color-border); }
#faq-section .faq-question { display: grid; grid-template-columns: 58px 1fr 42px; align-items: center; gap: 20px; min-height: 91px; padding: 12px 0; }
#faq-section .faq-number { color: var(--color-accent); font-size: 12px; font-weight: 900; }
#faq-section .faq-question-text { font-size: 18px; font-weight: 800; }
#faq-section .faq-icon { position: relative; width: 38px; height: 38px; border: 1px solid var(--color-border); transition: background var(--transition-fast), border-color var(--transition-fast); }
#faq-section .faq-icon::before, #faq-section .faq-icon::after { position: absolute; top: 18px; left: 11px; width: 14px; height: 1px; background: var(--color-text); content: ""; transition: transform var(--transition-fast), background var(--transition-fast); }
#faq-section .faq-icon::after { transform: rotate(90deg); }
#faq-section .faq-question[aria-expanded="true"] .faq-icon { border-color: var(--color-brand); background: var(--color-brand); }
#faq-section .faq-question[aria-expanded="true"] .faq-icon::before, #faq-section .faq-question[aria-expanded="true"] .faq-icon::after { background: #ffffff; }
#faq-section .faq-question[aria-expanded="true"] .faq-icon::after { transform: rotate(0); }
#faq-section .faq-answer { display: none; padding: 0 72px 28px 78px; color: var(--color-muted); font-size: 15px; }

/* contact */
#contact-section { position: relative; padding: 105px 0 112px; overflow: hidden; background: var(--color-brand); color: #ffffff; }
#contact-section::before { position: absolute; inset: 0; background-image: linear-gradient(rgba(255, 255, 255, 0.07) 1px, transparent 1px), linear-gradient(90deg, rgba(255, 255, 255, 0.07) 1px, transparent 1px); background-size: 52px 52px; content: ""; mask-image: linear-gradient(90deg, transparent, #000 45%, #000); }
#contact-section .contact-layout { position: relative; display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: end; gap: 80px; }
#contact-section .contact-label { color: #bfe0e1; font-size: 13px; font-weight: 800; letter-spacing: 0.14em; }
#contact-section .contact-title { max-width: 900px; margin-top: 20px; font-size: clamp(40px, 5.2vw, 76px); font-weight: 900; letter-spacing: -0.055em; }
#contact-section .contact-text { max-width: 640px; margin-top: 24px; color: rgba(255, 255, 255, 0.76); font-size: 16px; }
#contact-section .contact-link { display: flex; align-items: center; justify-content: center; width: 154px; height: 154px; border-radius: 50%; background: var(--color-accent); color: #ffffff; font-size: 16px; font-weight: 800; text-align: center; transition: background var(--transition-fast), transform var(--transition-fast); }
#contact-section .contact-link::after { display: block; margin-left: 8px; content: "↗"; }
#contact-section .contact-link:hover, #contact-section .contact-link:focus-visible { background: #ffffff; color: var(--color-brand-dark); transform: rotate(-4deg) scale(1.04); }

/* footer */
footer { padding: 54px 0 30px; background: #0e1918; color: #ffffff; }
footer .footer-top { display: grid; grid-template-columns: 1.2fr 0.8fr 1fr; gap: 70px; padding-bottom: 48px; border-bottom: 1px solid rgba(255, 255, 255, 0.14); }
footer .footer-brand { max-width: 430px; }
footer .footer-logo { display: flex; align-items: center; gap: 13px; font-size: 20px; font-weight: 900; }
footer .footer-mark { position: relative; display: block; width: 35px; height: 35px; background: url(../image/brand_light.webp) no-repeat 50% / cover; }
footer .footer-description { margin-top: 21px; color: rgba(255, 255, 255, 0.58); font-size: 13px; }
footer .footer-heading { margin-bottom: 18px; color: rgba(255, 255, 255, 0.48); font-size: 11px; font-weight: 800; letter-spacing: 0.14em; }
footer .footer-item { margin-bottom: 8px; }
footer .footer-item a { display: inline-block; color: rgba(255, 255, 255, 0.78); font-size: 14px; transition: color var(--transition-fast), transform var(--transition-fast); }
footer .footer-item a:hover, footer .footer-item a:focus-visible { color: #ffffff; transform: translateX(4px); }
footer .footer-service-list { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 24px; }
footer .footer-bottom { display: flex; align-items: center; justify-content: space-between; gap: 30px; padding-top: 28px; color: rgba(255, 255, 255, 0.4); font-size: 11px; letter-spacing: 0.05em; }
footer .footer-policy { display: flex; gap: 24px; }
footer .footer-policy a:hover, footer .footer-policy a:focus-visible { color: #ffffff; }

@media (max-width: 1280px) {
	:root { --section-space: 112px; }
	.site-container { width: min(calc(100% - 64px), var(--container-width)); }
	header .header-container { width: calc(100% - 64px); }
	header .header-right { gap: 28px; }
	header .nav-list { gap: 24px; }
	#hero-section .hero-grid { gap: 48px; }
	#hero-section .hero-bottom { grid-template-columns: 1fr; gap: 25px; }
	#hero-section .hero-actions { justify-content: flex-start; }
	#scope-section .scope-heading { grid-template-columns: 220px minmax(0, 1fr); gap: 50px; }
	#scope-section .scope-item { grid-template-columns: 70px minmax(190px, 0.62fr) minmax(0, 1fr) 110px; gap: 24px; }
	#process-section .process-layout { gap: 70px; }
	#process-section .process-item { grid-template-columns: 90px 190px minmax(0, 1fr); }
	#quality-section .quality-layout { gap: 65px; }
}
@media (max-width: 960px) {
	:root { --header-height: 76px; --section-space: 96px; }
	header .header-action { display: none; }
	header .menu-toggle { display: block; }
	header .site-nav { position: fixed; top: 0; right: 0; z-index: -1; display: flex; align-items: center; width: min(82vw, 430px); height: 100vh; padding: 120px 42px 60px; background: var(--color-dark); color: #ffffff; opacity: 0; pointer-events: none; transform: translateX(100%); transition: opacity var(--transition-base), transform var(--transition-base); }
	header .site-nav.is-open { opacity: 1; pointer-events: auto; transform: translateX(0); }
	header .nav-list { display: block; width: 100%; }
	header .nav-item { border-bottom: 1px solid rgba(255, 255, 255, 0.15); }
	header .nav-item a { padding: 20px 0; font-size: 19px; }
	#hero-section { min-height: 840px; }
	#hero-section .hero-grid { grid-template-columns: 1fr; gap: 46px; }
	#hero-section .hero-content { max-width: 690px; }
	#hero-section .hero-panel { width: min(100%, 570px); margin-left: auto; }
	#hero-section .scroll-cue { display: none; }
	#scope-section .scope-heading { grid-template-columns: 1fr; gap: 30px; }
	#scope-section .scope-intro { margin-top: 28px; }
	#scope-section .scope-item { grid-template-columns: 55px minmax(180px, 0.7fr) minmax(0, 1fr); }
	#scope-section .scope-tag { display: none; }
	#space-section .space-stage { min-height: 820px; }
	#space-section .space-heading { width: 68%; padding: 46px 45px 50px; }
	#space-section .space-index { width: 58%; }
	#process-section .process-layout { grid-template-columns: 1fr; gap: 65px; }
	#process-section .process-left { display: grid; grid-template-columns: 1fr 0.85fr; gap: 50px; }
	#process-section .process-note { margin-top: 41px; }
	#project-section .project-header { grid-template-columns: 1fr; gap: 25px; }
	#project-section .project-header-text { max-width: 600px; }
	#project-section .project-grid { grid-template-columns: 1fr 1fr; grid-template-rows: 510px 310px; }
	#project-section .project-item:first-child { grid-column: 1 / 3; grid-row: auto; }
	#quality-section .quality-layout { grid-template-columns: 1fr; gap: 65px; }
	#quality-section .quality-left { display: grid; grid-template-columns: 1fr 0.75fr; gap: 50px; }
	#quality-section .quality-rule { grid-column: 1 / 3; margin-top: 0; }
	#quality-section .quality-band { grid-template-columns: 1fr 1fr; }
	#faq-section .faq-layout { grid-template-columns: 1fr; gap: 55px; }
	#faq-section .faq-left { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; }
	#contact-section .contact-layout { grid-template-columns: 1fr; gap: 54px; }
	#contact-section .contact-link { width: auto; height: 58px; padding: 0 28px; border-radius: 0; justify-self: start; }
	footer .footer-top { grid-template-columns: 1.3fr 0.7fr; }
	footer .footer-services { grid-column: 1 / 3; }
}
@media (max-width: 768px) {
	:root { --section-space: 78px; }
	.site-container { width: min(calc(100% - 40px), var(--container-width)); }
	header .header-container { width: calc(100% - 40px); }
	header h1 { font-size: 16px; }
	header .brand-mark { width: 33px; height: 33px; }
	#hero-section { min-height: 760px; padding-bottom: 42px; }
	#hero-section::before { background-position: 60% center; }
	#hero-section::after { background: linear-gradient( 90deg, rgba(11, 25, 24, 0.93), rgba(11, 25, 24, 0.46) ), linear-gradient(0deg, rgba(11, 25, 24, 0.82), transparent 62%); }
	#hero-section .hero-kicker { margin-bottom: 20px; font-size: 12px; }
	#hero-section .hero-title { font-size: clamp(42px, 11.8vw, 67px); }
	#hero-section .hero-text { font-size: 15px; }
	#hero-section .hero-panel { margin-left: 0; }
	#hero-section .hero-panel-list { display: grid; grid-template-columns: 1fr 1fr 1fr; padding: 0 20px; }
	#hero-section .hero-panel-item { grid-template-columns: 1fr; gap: 4px; padding: 16px 12px; border-right: 1px solid rgba(255, 255, 255, 0.14); border-bottom: 0; }
	#hero-section .hero-panel-item:last-child { border-right: 0; }
	#hero-section .hero-panel-note { display: none; }
	#scope-section .scope-heading { padding-bottom: 55px; }
	#scope-section .scope-intro { grid-template-columns: 1fr; gap: 18px; }
	#scope-section .scope-item { grid-template-columns: 42px 1fr; gap: 15px; min-height: 0; padding: 27px 0; }
	#scope-section .scope-description { grid-column: 2; }
	#space-section .space-stage { display: flex; flex-direction: column; min-height: 0; padding-top: 390px; background-position: 58% center; }
	#space-section .space-heading { position: relative; width: calc(100% - 36px); padding: 36px 32px 40px; }
	#space-section .space-index { position: relative; width: calc(100% - 36px); margin-left: 36px; }
	#space-section .space-caption { top: 340px; bottom: auto; }
	#space-section .space-item { grid-template-columns: 65px 1fr auto; min-height: 92px; padding: 18px 24px; }
	#process-section .process-left { grid-template-columns: 1fr; gap: 0; }
	#process-section .process-item { grid-template-columns: 78px 1fr; gap: 20px; padding: 28px 0; }
	#process-section .process-description { grid-column: 2; padding-top: 0; }
	#process-section .process-list::before { left: 38px; }
	#process-section .process-step { width: 48px; height: 48px; margin-left: 14px; }
	#project-section .project-grid { grid-template-columns: 1fr; grid-template-rows: 470px 310px 310px; }
	#project-section .project-item:first-child { grid-column: auto; }
	#quality-section .quality-left { grid-template-columns: 1fr; gap: 0; }
	#quality-section .quality-rule { grid-column: auto; margin-top: 42px; }
	#quality-section .quality-item { grid-template-columns: 100px 1fr; }
	#quality-section .quality-description { grid-column: 2; }
	#quality-section .quality-band { margin-top: 65px; }
	#faq-section .faq-left { grid-template-columns: 1fr; gap: 0; }
	#faq-section .faq-question { grid-template-columns: 40px 1fr 38px; gap: 13px; }
	#faq-section .faq-answer { padding: 0 50px 25px 53px; }
	footer .footer-top { grid-template-columns: 1fr 1fr; gap: 45px; }
	footer .footer-brand { grid-column: 1 / 3; }
}
@media (max-width: 500px) {
	:root { --section-space: 66px; }
	.site-container { width: calc(100% - 32px); }
	header .header-container { width: calc(100% - 32px); }
	header h1 { font-size: 14px; letter-spacing: 0.02em; }
	header .brand-link { gap: 10px; }
	header .brand-mark { width: 30px; height: 30px; }
	header .site-nav { width: 100%; padding: 105px 28px 40px; }
	#hero-section { min-height: 720px; padding-top: 125px; }
	#hero-section .hero-grid { gap: 32px; }
	#hero-section .hero-title { font-size: 43px; line-height: 1.12; }
	#hero-section .hero-kicker { letter-spacing: 0.09em; }
	#hero-section .hero-kicker::before { width: 30px; }
	#hero-section .hero-bottom { margin-top: 24px; }
	#hero-section .hero-actions { display: grid; grid-template-columns: 1fr 1fr; width: 100%; }
	#hero-section .primary-link, #hero-section .secondary-link { min-height: 50px; padding: 0 13px; font-size: 13px; }
	#hero-section .hero-panel-header { display: none; }
	#hero-section .hero-panel-list { padding: 0 7px; }
	#hero-section .hero-panel-item { padding: 14px 8px; }
	#hero-section .hero-panel-name { font-size: 12px; }
	#scope-section .scope-title { font-size: 35px; }
	#scope-section .scope-name { font-size: 21px; }
	#scope-section .scope-description { font-size: 14px; }
	#space-section { padding-bottom: 0; }
	#space-section .space-stage { padding-top: 320px; background-position: 58% top; }
	#space-section .space-heading { width: calc(100% - 16px); padding: 31px 24px 35px; }
	#space-section .space-title { font-size: 34px; }
	#space-section .space-text { font-size: 14px; }
	#space-section .space-index { width: calc(100% - 16px); margin-left: 16px; }
	#space-section .space-caption { top: 280px; left: 16px; }
	#space-section .space-item { grid-template-columns: 43px 1fr auto; padding: 16px 18px; }
	#space-section .space-note { display: none; }
	#process-section .process-title { font-size: 38px; }
	#process-section .process-item { grid-template-columns: 64px 1fr; gap: 13px; }
	#process-section .process-list::before { left: 31px; }
	#process-section .process-step { width: 43px; height: 43px; margin-left: 9px; }
	#process-section .process-name { font-size: 19px; }
	#project-section .project-grid { grid-template-rows: 390px 260px 260px; }
	#project-section .project-item:first-child .project-name { font-size: 23px; }
	#project-section .project-caption { padding: 65px 20px 20px; }
	#quality-section .quality-title { font-size: 39px; }
	#quality-section .quality-item { grid-template-columns: 82px 1fr; gap: 15px; }
	#quality-section .quality-unit { font-size: 20px; }
	#quality-section .quality-band { grid-template-columns: 1fr; }
	#quality-section .quality-band-item { min-height: 115px; }
	#faq-section .faq-title { font-size: 39px; }
	#faq-section .faq-question { grid-template-columns: 30px 1fr 36px; }
	#faq-section .faq-question-text { font-size: 16px; }
	#faq-section .faq-answer { padding: 0 44px 24px 43px; }
	#contact-section { padding: 76px 0 82px; }
	#contact-section .contact-title { font-size: 40px; }
	footer .footer-top { grid-template-columns: 1fr; }
	footer .footer-brand, footer .footer-services { grid-column: auto; }
	footer .footer-service-list { grid-template-columns: 1fr; }
	footer .footer-bottom { align-items: flex-start; flex-direction: column; }
}
@media (prefers-reduced-motion: reduce) {
	html { scroll-behavior: auto; }
	*, *::before, *::after { animation-duration: 0.01ms; animation-iteration-count: 1; scroll-behavior: auto; transition-duration: 0.01ms; }
	.reveal-mask { clip-path: none; }
	.reveal-shift { opacity: 1; transform: none; }
}