:root {
  --ink: #1c1c1c;
  --grey: #6b6b6b;
  --line: #e5e2dd;
  --bg: #ffffff;
  --bg-soft: #faf9f7;
  --process-accent: #3f5a4d;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: 'Jost', 'PingFang TC', 'Microsoft JhengHei', sans-serif;
  color: var(--ink);
  background: var(--bg);
  font-weight: 400;
  line-height: 1.8;
}
img { display: block; width: 100%; height: 100%; object-fit: cover; }
a { color: inherit; text-decoration: none; }
a:focus-visible { outline: 2px solid var(--ink); outline-offset: 4px; }
section[id], footer[id] { scroll-margin-top: 84px; }

/* Nav */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 10;
  display: flex; justify-content: space-between; align-items: center;
  padding: 22px 48px;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.logo { font-size: 15px; letter-spacing: .35em; text-transform: uppercase; font-weight: 400; white-space: nowrap; }
.logo span { color: var(--grey); }
nav ul { display: flex; gap: 36px; list-style: none; }
nav ul a { font-size: 14px; letter-spacing: .18em; color: var(--grey); transition: color .3s; }
nav ul a:hover { color: var(--ink); }

.nav-burger {
  display: none; width: 22px; height: 16px; padding: 0;
  position: relative; cursor: pointer;
  border: 0; background: transparent; color: inherit;
}
.nav-burger span, .nav-burger::before, .nav-burger::after {
  content: ""; position: absolute; left: 0; right: 0; height: 1px; background: var(--ink);
}
.nav-burger::before { top: 0; }
.nav-burger span { top: 7px; }
.nav-burger::after { top: 14px; }
.nav-burger:focus-visible { outline: 2px solid var(--ink); outline-offset: 4px; }

/* Hero */
.hero { position: relative; height: 100vh; height: 100dvh; overflow: hidden; }
.hero picture { display: block; width: 100%; height: 100%; }
.hero img { filter: brightness(.94); transform: translateX(5%) scale(1.1); }
.hero-text {
  position: absolute; left: 48px; bottom: 72px;
  background: rgba(255,255,255,.88); backdrop-filter: blur(6px);
  padding: 36px 44px; max-width: 640px;
}
.hero-text h1 { font-size: 40px; font-weight: 300; letter-spacing: .12em; line-height: 1.45; }
.hero-text p { margin-top: 14px; color: var(--grey); font-size: 15px; letter-spacing: .1em; }

/* Sections */
section { padding: 110px 48px; max-width: 1280px; margin: 0 auto; }
.kicker { font-size: 13px; letter-spacing: .4em; color: var(--grey); text-transform: uppercase; margin-bottom: 14px; }
h2 { font-size: 32px; font-weight: 300; letter-spacing: .1em; margin-bottom: 48px; }

/* Philosophy */
.philosophy { text-align: center; max-width: 720px; }
.philosophy p { color: var(--grey); font-size: 17px; }
.phi-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 36px; margin-top: 64px; }
.phi-row h3 { font-size: 16px; font-weight: 500; letter-spacing: .18em; margin-bottom: 8px; }
.phi-row p { font-size: 15px; color: var(--grey); }
.lead { color: var(--grey); font-size: 16px; max-width: 560px; margin: -28px 0 56px; }

/* Project grid */
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.grid figure { position: relative; aspect-ratio: 4/3; overflow: hidden; }
.grid figure.wide { grid-column: span 2; aspect-ratio: 8/3; }
.grid figure.banner { grid-column: span 3; aspect-ratio: 21/9; }
.grid img { transition: transform .8s ease; }
.grid figure:hover img { transform: scale(1.04); }
.grid figcaption {
  position: absolute; left: 0; right: 0; bottom: 0;
  padding: 16px 20px 14px; font-size: 15px; letter-spacing: .15em;
  color: #fff; background: linear-gradient(transparent, rgba(0,0,0,.55));
}
.grid figcaption small { display: block; font-size: 12px; letter-spacing: .2em; opacity: .9; }

/* Services */
.services { background: var(--bg-soft); max-width: none; }
.services-inner { max-width: 1280px; margin: 0 auto; }
.svc-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; }
.svc-card { display: block; min-width: 0; padding-top: 18px; border-top: 1px solid var(--line); transition: border-color .2s ease; }
.svc-row h3 { font-size: 17px; font-weight: 500; letter-spacing: .15em; margin-bottom: 10px; }
.svc-row p { font-size: 15px; color: var(--grey); }
.svc-card:hover { border-color: var(--ink); }
.svc-card:hover h3 { color: var(--process-accent); }

/* Process */
.process { max-width: 1280px; padding-top: 104px; padding-bottom: 104px; }
.process-head { max-width: 790px; padding-bottom: 34px; border-bottom: 1px solid var(--line); }
.process-head h2 { margin-bottom: 15px; }
.process-intro { max-width: 620px; color: var(--grey); font-size: 15px; line-height: 1.9; }
.process-body {
  display: grid; grid-template-columns: minmax(0, 1.16fr) minmax(350px, .84fr);
  gap: 58px; align-items: center; padding-top: 34px;
}
.process-hero-visual { margin: 0; aspect-ratio: 16 / 10; overflow: hidden; background: var(--bg-soft); }
.process-hero-visual img { width: 100%; height: 100%; object-fit: cover; }
.process-timeline { margin: 0; list-style: none; border-top: 1px solid var(--line); }
.process-step {
  display: grid; grid-template-columns: 62px minmax(0, 1fr); gap: 18px; align-items: center;
  min-height: 74px; border-bottom: 1px solid var(--line);
}
.process-number { color: #cdd3cc; font-size: 35px; font-weight: 300; letter-spacing: -.05em; line-height: 1; }
.process-step > div { min-width: 0; border-left: 1px solid var(--line); padding-left: 22px; }
.process-en { color: var(--process-accent); font-size: 10px; line-height: 1.2; letter-spacing: .17em; text-transform: uppercase; margin-bottom: 5px; }
.process-step h3 { font-size: 17px; font-weight: 400; letter-spacing: .08em; line-height: 1.3; transition: color .2s ease; }
.process-step:hover h3 { color: var(--process-accent); }

/* Project detail page */
.project-page { padding-top: 160px; max-width: 1100px; }
.project-page h1 { font-size: 34px; font-weight: 300; letter-spacing: .12em; }
.project-page .meta { color: var(--grey); font-size: 13px; letter-spacing: .25em; margin: 10px 0 24px; text-transform: uppercase; }
.project-page .desc { max-width: 640px; color: var(--grey); font-size: 16px; line-height: 2; margin: 0 0 64px; }
.gallery { display: flex; flex-direction: column; gap: 20px; }
.gallery img { width: 100%; height: auto; }

/* 完工實景：手機直度相，唔可以用全闊單欄（1100px 闊會變 1950px 高） */
/* 蓋過全域 section 嘅 110px/48px padding，唔好喺 .project-page 入面再縮一次 */
.completed { margin: 96px 0 0; padding: 72px 0 0; max-width: none; border-top: 1px solid var(--line); }
.completed h2 { margin-bottom: 16px; }
.completed .lead { margin: 0 0 48px; }
.photo-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.photo-grid img { width: 100%; aspect-ratio: 9/16; object-fit: cover; }
.project-switcher {
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 32px;
  margin-top: 72px; padding-top: 28px; border-top: 1px solid var(--line);
}
.project-switcher__link {
  min-width: 0; display: flex; flex-direction: column; gap: 7px;
  color: var(--grey); transition: color .2s ease;
}
.project-switcher__link:hover { color: var(--ink); }
.project-switcher__link--next { grid-column: 2; text-align: right; align-items: flex-end; }
.project-switcher__link small { font-size: 11px; letter-spacing: .12em; text-transform: uppercase; }
.project-switcher__link strong { font-size: 15px; font-weight: 400; letter-spacing: 0; overflow-wrap: anywhere; }
.back { display: inline-block; margin-top: 64px; font-size: 13px; letter-spacing: .2em; color: var(--grey); }
.back:hover { color: var(--ink); }
.project-services { margin-top: 72px; padding-top: 28px; border-top: 1px solid var(--line); }
.project-services h2 { font-size: 22px; font-weight: 300; letter-spacing: .1em; margin-bottom: 20px; }
.project-services__links { display: flex; flex-wrap: wrap; gap: 12px 26px; }
.project-services__links a { color: var(--grey); font-size: 13px; letter-spacing: .08em; text-decoration: underline; text-underline-offset: 4px; }
.project-services__links a:hover { color: var(--ink); }

/* Service detail pages */
.service-page { padding-top: 160px; max-width: 1100px; }
.service-page h1 { font-size: 34px; font-weight: 300; letter-spacing: .12em; }
.service-page .meta { color: var(--grey); font-size: 13px; letter-spacing: .25em; margin: 10px 0 24px; text-transform: uppercase; }
.service-page .intro { max-width: 700px; color: var(--grey); font-size: 16px; line-height: 2; margin: 0 0 52px; }
.service-hero { margin: 0 0 64px; aspect-ratio: 16 / 8; overflow: hidden; background: var(--bg-soft); }
.service-hero img { width: 100%; height: 100%; object-fit: cover; }
.service-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 30px; }
.service-block { border-top: 1px solid var(--line); padding: 24px 0 0; }
.service-block h2 { font-size: 19px; font-weight: 400; letter-spacing: .08em; margin: 0 0 14px; }
.service-block p { color: var(--grey); font-size: 15px; line-height: 1.9; }
.service-note { max-width: 760px; margin: 72px 0 0; padding: 28px 30px; background: var(--bg-soft); color: var(--grey); font-size: 15px; line-height: 1.9; }
.service-related { margin-top: 80px; padding-top: 30px; border-top: 1px solid var(--line); }
.service-related h2 { font-size: 22px; font-weight: 300; letter-spacing: .1em; margin-bottom: 24px; }
.service-case-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.service-case { display: block; min-width: 0; }
.service-case__image { display: block; aspect-ratio: 4 / 3; overflow: hidden; background: var(--bg-soft); }
.service-case__image img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s ease; }
.service-case:hover .service-case__image img { transform: scale(1.03); }
.service-case strong { display: block; margin-top: 12px; font-size: 15px; font-weight: 400; letter-spacing: .06em; }
.service-case small { display: block; margin-top: 2px; color: var(--grey); font-size: 12px; letter-spacing: .1em; }
.service-links { display: flex; flex-wrap: wrap; gap: 12px 26px; margin-top: 28px; }
.service-links a { color: var(--grey); font-size: 13px; letter-spacing: .08em; text-decoration: underline; text-underline-offset: 4px; }
.service-links a:hover { color: var(--ink); }

/* Contact */
footer { border-top: 1px solid var(--line); padding: 80px 48px; text-align: center; }
footer .logo { margin-bottom: 24px; }
footer p { color: var(--grey); font-size: 15px; letter-spacing: .12em; }
footer p a { color: inherit; text-decoration: none; }
footer p a:hover, footer p a:focus-visible { color: var(--ink); text-decoration: underline; text-underline-offset: 3px; }

@media (max-width: 1100px) {
  nav { padding: 16px 20px; flex-wrap: wrap; }
  .logo { font-size: 11px; letter-spacing: .2em; }
  .nav-burger { display: block; }
  nav ul {
    flex-basis: 100%; flex-direction: column; align-items: flex-end; gap: 16px;
    max-height: 0; overflow: hidden; visibility: hidden;
    transition: max-height .3s ease, visibility 0s linear .3s;
  }
  nav ul.is-open {
    max-height: 260px; margin-top: 20px; padding-bottom: 4px; visibility: visible;
    transition-delay: 0s;
  }
}

@media (max-width: 1023px) {
  .process { padding-top: 80px; padding-bottom: 80px; }
  .process-head { padding-bottom: 28px; }
  .process-body { grid-template-columns: minmax(0, 1fr) minmax(310px, .8fr); gap: 34px; padding-top: 28px; }
  .process-step { grid-template-columns: 52px minmax(0, 1fr); gap: 14px; min-height: 66px; }
  .process-number { font-size: 31px; }
  .process-step > div { padding-left: 16px; }
}

@media (max-width: 800px) {
  .phi-row { grid-template-columns: 1fr; gap: 24px; }
  section { padding: 70px 20px; }
  .hero { height: 72vh; height: 72dvh; min-height: 460px; }
  .hero-text { left: 20px; right: 20px; bottom: 40px; padding: 24px; }
  .hero-text h1 { font-size: 30px; letter-spacing: .06em; line-height: 1.4; }
  .hero-text p { font-size: 13px; letter-spacing: .05em; }
  .hero-text .kicker { font-size: 11px; letter-spacing: .22em; white-space: nowrap; }
  .grid { grid-template-columns: 1fr; }
  .grid figure.wide, .grid figure.banner { grid-column: span 1; aspect-ratio: 4/3; }
  .svc-row { grid-template-columns: 1fr; gap: 28px; }
  .process { padding-top: 64px; padding-bottom: 64px; }
  .process-head { padding-bottom: 24px; }
  .process-head h2 { margin-bottom: 12px; }
  .process-intro { font-size: 14px; line-height: 1.8; }
  .process-body { grid-template-columns: 1fr; gap: 26px; padding-top: 24px; }
  .process-hero-visual { aspect-ratio: 16 / 10; }
  .process-step { grid-template-columns: 44px minmax(0, 1fr); gap: 10px; min-height: 60px; }
  .process-number { font-size: 27px; }
  .process-step > div { padding-left: 13px; }
  .process-en { margin-bottom: 3px; font-size: 9px; }
  .process-step h3 { font-size: 16px; letter-spacing: .06em; }
  .project-page, .service-page { padding-top: 130px; }
  .project-page h1, .service-page h1 { font-size: 28px; line-height: 1.55; letter-spacing: .06em; overflow-wrap: anywhere; }
  .service-grid, .service-case-grid { grid-template-columns: 1fr; gap: 24px; }
  .service-hero { margin-bottom: 48px; aspect-ratio: 4 / 3; }
  .service-note { margin-top: 56px; padding: 24px; }
  .service-related { margin-top: 64px; }
  .project-services { margin-top: 64px; }
  .photo-grid { grid-template-columns: repeat(2, 1fr); }
  .completed { margin-top: 64px; padding: 56px 0 0; }
}

@media (max-width: 360px) {
  .hero-text .kicker { font-size: 9px; letter-spacing: .08em; }
  .project-switcher { grid-template-columns: 1fr; gap: 24px; }
  .project-switcher__link--next { grid-column: 1; text-align: left; align-items: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
  }
}