/* ALKINO graphite and titanium homepage. */
:root {
  color-scheme: dark;
  --graphite: #101214;
  --white: #F5F6F7;
  --titanium: #939BA4;
  --line: #2B3035;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 24px; }
body { margin: 0; background: var(--graphite); color: var(--white); font-family: var(--sans); -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
a:focus-visible, button:focus-visible { outline: 2px solid currentColor; outline-offset: 6px; }
button { font: inherit; color: inherit; }
p, h1, h2, figure { margin: 0; }
p { line-height: 1.8; }
img { display: block; width: 100%; height: 100%; object-fit: cover; }
section { scroll-margin-top: 24px; }
::selection { background: #505A64; color: #FFFFFF; }
.container { width: min(1320px, 100%); margin-inline: auto; padding-inline: 48px; }
.skip-link { position: fixed; z-index: 10; top: 12px; left: 12px; padding: 12px 16px; color: var(--graphite); background: var(--white); transform: translateY(-170%); }
.skip-link:focus { transform: none; }

/* A quiet, single-line frame around the full-width imagery. */
.site-header { min-height: 84px; display: flex; align-items: center; gap: 32px; }
.wordmark { flex-shrink: 0; font-size: 27px; letter-spacing: .12em; font-weight: 700; }
.site-header nav { display: flex; align-items: center; font-size: 12px; }
.nav-links { gap: 24px; }
.nav-links a, .languages a { white-space: nowrap; color: #C4CAD0; transition: color .2s ease; }
.nav-links a:hover, .languages a:hover { color: #FFFFFF; }
.site-header .languages { margin-left: auto; gap: 18px; }
.languages [aria-current] { color: #FFFFFF; border-bottom: 1px solid #939BA4; padding-block: 5px; }

/* The existing, approved type and image scale is retained. */
.sector-hero { position: relative; isolation: isolate; overflow: hidden; height: clamp(680px, 56.25vw, 900px); }
.sector-hero-art { position: absolute; inset: 0; pointer-events: none; }
.sector-hero-art img { position: absolute; inset: 0; object-position: center bottom; animation: graphite-camera 48s ease-in-out infinite; }
.sector-hero::after { content: ""; position: absolute; z-index: 1; inset: 0; pointer-events: none; background: linear-gradient(90deg, rgba(16,18,20,.46), rgba(16,18,20,.22) 34%, rgba(16,18,20,0) 65%), linear-gradient(0deg, rgba(16,18,20,.5), rgba(16,18,20,0) 19%); }
.sector-hero > .container { position: relative; z-index: 2; }
.hero-copy { max-width: 490px; padding-top: 72px; }
.eyebrow, .section-label { font-size: 11px; font-weight: 600; line-height: 1.5; letter-spacing: .08em; text-transform: uppercase; }
.sector-hero .eyebrow { font-size: 12px; letter-spacing: .07em; margin-bottom: 30px; color: #BFC7CE; }
.hero-copy h1 { font-size: clamp(58px, 5vw, 72px); font-weight: 600; line-height: 1.06; letter-spacing: -.045em; text-wrap: balance; }
.hero-copy h1 span, h2 span { display: block; }
html[lang="zh-CN"] .hero-copy h1 { font-size: clamp(58px, 5.7vw, 82px); line-height: 1.18; letter-spacing: -.035em; }
.hero-copy .intro { max-width: 350px; margin-top: 29px; font-size: 18px; font-weight: 450; line-height: 1.9; color: #DCE1E5; }
.intro .brand-position { display: block; margin-top: 12px; text-wrap: balance; }
.text-link { display: inline-flex; align-items: center; gap: 30px; padding-block: 12px; font-size: 13px; border-bottom: 1px solid #7D8791; transition: border-color .2s ease, color .2s ease; }
.text-link:hover { color: #FFFFFF; border-color: #FFFFFF; }
.hero-copy .text-link { margin-top: 25px; }
.sector-hero-caption { position: absolute; z-index: 2; left: 0; right: 0; bottom: 28px; display: flex; justify-content: space-between; gap: 20px; width: min(1320px, 100%); margin-inline: auto; padding-inline: 48px; color: #C0C7CE; font-size: 10px; line-height: 1.7; letter-spacing: .04em; }
.art-motion-toggle { position: absolute; z-index: 3; right: max(48px, calc((100% - 1320px) / 2 + 48px)); bottom: 63px; cursor: pointer; padding: 7px 10px; border: 1px solid rgba(245,246,247,.28); background: rgba(16,18,20,.45); color: #D5DADE; font-size: 10px; line-height: 1.5; }
.art-motion-toggle:hover, .art-motion-toggle[aria-pressed="true"] { color: #FFFFFF; border-color: #939BA4; background: rgba(16,18,20,.75); }

/* Alternating light and dark scenes carry the chapter rhythm. */
.sector-chapter { position: relative; isolation: isolate; overflow: hidden; width: 100%; }
.sector-heading { position: absolute; z-index: 2; top: 6%; width: 34%; max-width: 490px; }
#collaboration { color: var(--graphite); background: var(--white); }
#collaboration .sector-heading { right: 4%; }
#operations .sector-heading { left: 4%; width: 40%; }
.sector-heading .section-label { margin-bottom: clamp(8px, 1.25vw, 18px); font-size: clamp(7px, .8vw, 11px); line-height: 1.5; letter-spacing: .05em; }
#collaboration .section-label { color: #515A63; }
#operations .section-label { color: #BFC7CE; }
.sector-heading h2 { font-size: clamp(14px, 3.5vw, 50px); font-weight: 550; line-height: 1.25; letter-spacing: -.03em; text-wrap: balance; }
html[lang="en"] .sector-heading h2 { font-size: clamp(9px, 3vw, 43px); letter-spacing: -.045em; }
.sector-picture { position: relative; }
.sector-picture img { height: auto; aspect-ratio: 16 / 9; object-fit: contain; }
.sector-picture::after { content: ""; position: absolute; z-index: 1; inset: 0; pointer-events: none; }
#collaboration .sector-picture::after { background: radial-gradient(ellipse 60% 42% at 100% 0, rgba(245,246,247,.98), rgba(245,246,247,.92) 66%, rgba(245,246,247,0) 100%); }
#operations .sector-picture::after { background: radial-gradient(ellipse 65% 38% at 0 0, rgba(16,18,20,.82), rgba(16,18,20,.62) 55%, rgba(16,18,20,0) 100%); }
.sector-picture figcaption { position: absolute; z-index: 2; right: 4%; bottom: clamp(10px, 2vw, 28px); color: #BFC7CE; font-size: clamp(7px, .7vw, 10px); line-height: 1.7; letter-spacing: .04em; }
#collaboration .sector-picture figcaption { color: #515A63; }

.contact { display: flex; align-items: end; justify-content: space-between; gap: 40px; padding-block: 86px; }
.contact .section-label { margin-bottom: 22px; color: var(--titanium); }
.contact h2 { font-size: clamp(36px, 4.1vw, 58px); font-weight: 550; line-height: 1.17; letter-spacing: -.045em; text-wrap: balance; }
html[lang="zh-CN"] .contact h2 { letter-spacing: -.03em; }
.contact .text-link { white-space: nowrap; }
.site-footer { display: flex; align-items: center; justify-content: space-between; gap: 28px; padding-block: 28px; border-top: 1px solid var(--line); color: #AEB6BE; font-size: 10px; letter-spacing: .06em; }

@keyframes graphite-camera { 0%, 100% { transform: none; } 50% { transform: scale(1.008); } }
.art-still .sector-hero-art img { animation: none; transform: none; }

@media (max-width: 1000px) {
  .container { padding-inline: 32px; }
  .site-header { gap: 26px; }
  .nav-links { gap: 18px; }
  .sector-hero { height: clamp(460px, 68vw, 680px); }
  .sector-hero > .container { padding-inline: clamp(16px, 4vw, 40px); }
  .hero-copy { max-width: min(490px, 54vw); padding-top: clamp(24px, 5vw, 56px); }
  .sector-hero .eyebrow { margin-bottom: 18px; font-size: clamp(8px, .833vw, 12px); letter-spacing: .03em; }
  html[lang="zh-CN"] .hero-copy h1 { font-size: clamp(26px, 5.7vw, 64px); }
  html[lang="en"] .hero-copy h1 { font-size: clamp(24px, 5vw, 64px); }
  .hero-copy .intro { max-width: min(350px, 100%); margin-top: 18px; font-size: clamp(12px, 1.8vw, 18px); line-height: 1.55; }
  .intro .brand-position { margin-top: 8px; }
  .hero-copy .text-link { margin-top: 16px; padding-block: 8px; gap: 18px; font-size: clamp(11px, 1.3vw, 13px); }
  .sector-hero-caption { bottom: 16px; padding-inline: clamp(16px, 4vw, 40px); gap: 12px; font-size: clamp(7px, .85vw, 10px); letter-spacing: .02em; }
  .art-motion-toggle { right: clamp(16px, 4vw, 40px); bottom: 48px; }
}

@media (max-width: 900px) {
  .site-header { min-height: 0; padding-block: 22px; flex-wrap: wrap; gap: 20px 16px; }
  .site-header .nav-links { order: 3; width: 100%; justify-content: space-between; gap: 16px; }
  .site-header .languages { margin-left: auto; }
}

@media (max-width: 700px) {
  .container { padding-inline: 24px; }
  .wordmark { font-size: 23px; }
  .site-header .languages { gap: 13px; font-size: 11px; }
  .site-header .nav-links { gap: 12px; font-size: 11px; }
  html[lang="en"] .site-header .nav-links { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px 18px; }
  .contact { display: block; padding-block: 65px; }
  .contact h2 { font-size: 36px; }
  .contact .text-link { margin-top: 27px; }
  .site-footer { flex-wrap: wrap; gap: 18px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .sector-hero-art img { animation: none; transform: none; }
  a { transition: none; }
  .art-motion-toggle { display: none; }
}

@media print {
  html { scroll-behavior: auto; }
  .sector-hero-art img { animation: none; transform: none; }
  .art-motion-toggle { display: none; }
  .site-header { padding-block: 24px; }
  .sector-hero { height: 680px; }
}