/* ==========================================================================
   YESON WATER TREATMENT — Corporate Site
   Light edition. Palette taken from the official mark (#351C99); headings set
   light-weight to echo the logotype, getting heavier as they get smaller.
   ========================================================================== */

/* ---------- 1. Tokens ---------- */
:root{
  /* brand — sampled from 也順LOGO.bmp */
  --brand:#351C99;
  --brand-deep:#251169;
  --brand-lift:#5B3FD0;
  --brand-soft:#EFECFB;

  /* signal (water / data) */
  --aqua:#0A758F;
  --aqua-dim:#2E8296;
  --aqua-soft:#E4F3F7;

  /* ground */
  --bg:#FFFFFF;
  --bg-2:#FAFAFD;
  --surface:#FFFFFF;
  --surface-2:#F5F5FB;
  --surface-3:#EEECF8;

  /* ink */
  --ink:#15142B;
  --ink-2:#4C4B66;
  --ink-3:#605F78;
  --ink-4:#6F6E88;

  /* lines */
  --line:rgba(53,28,153,.12);
  --line-2:rgba(53,28,153,.19);
  --line-3:rgba(53,28,153,.32);

  /* elevation */
  --sh-sm:0 1px 2px rgba(21,20,43,.05);
  --sh:0 10px 30px -14px rgba(37,17,105,.22);
  --sh-lg:0 26px 60px -26px rgba(37,17,105,.30);

  /* type */
  --sans:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang TC","Microsoft JhengHei",sans-serif;
  --mono:"IBM Plex Mono","SFMono-Regular",Consolas,"Liberation Mono",monospace;

  /* rhythm */
  --pad:clamp(76px,9vw,132px);
  --gut:clamp(20px,5vw,40px);
  --maxw:1240px;
  --r:14px;
  --r-sm:9px;

  --ease:cubic-bezier(.22,.68,.34,1);
}

html[lang="zh-Hant"]{
  --sans:"Inter","PingFang TC","Microsoft JhengHei","Noto Sans TC","Noto Sans CJK TC",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
}

/* Japanese kanji differ from Traditional Chinese forms — use a JP face */
html[lang="ja"]{
  --sans:"Inter","Hiragino Kaku Gothic ProN","Yu Gothic",Meiryo,"Noto Sans JP","Noto Sans CJK JP",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
}

/* ---------- 2. Reset ---------- */
picture{display:contents}
*,*::before,*::after{box-sizing:border-box}
*{margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:96px}
body{
  font-family:var(--sans);
  background:var(--bg);
  color:var(--ink);
  font-size:16px;
  line-height:1.68;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
}
img,svg,video{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button,input,textarea,select{font:inherit;color:inherit}
ul,ol{list-style:none}
table{border-collapse:collapse;width:100%}
::selection{background:rgba(53,28,153,.16);color:var(--brand-deep)}

/* ---------- 3. Language ----------
   Each page is served in a single language at its own URL (/ , /zh/, /ja/, /de/),
   so nothing is hidden here. The l-* classes remain only as content markers.   */

/* ---------- 4. Ambient background ---------- */
.ambient{position:fixed;inset:0;z-index:0;pointer-events:none;overflow:hidden}
.ambient::before{                       /* fine engineering grid */
  content:"";position:absolute;inset:-10%;
  background-image:
    linear-gradient(to right,rgba(53,28,153,.055) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(53,28,153,.055) 1px,transparent 1px);
  background-size:68px 68px;
  -webkit-mask-image:radial-gradient(ellipse 78% 58% at 50% 18%,#000 0%,transparent 76%);
          mask-image:radial-gradient(ellipse 78% 58% at 50% 18%,#000 0%,transparent 76%);
}
.orb{position:absolute;border-radius:50%;filter:blur(100px);opacity:.55}
.orb-a{width:640px;height:640px;top:-260px;left:-160px;
  background:radial-gradient(circle,rgba(53,28,153,.16),transparent 68%)}
.orb-b{width:540px;height:540px;top:12%;right:-200px;
  background:radial-gradient(circle,rgba(14,138,168,.13),transparent 68%)}
.orb-c{width:720px;height:720px;bottom:-320px;left:36%;
  background:radial-gradient(circle,rgba(91,63,208,.12),transparent 70%)}

/* ---------- 5. Layout primitives ---------- */
.wrap{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gut);position:relative;z-index:1}
.section{padding-block:var(--pad);position:relative;z-index:1}
.section--tight{padding-block:clamp(54px,6vw,84px)}
.section--alt{background:linear-gradient(180deg,transparent,var(--bg-2) 10%,var(--bg-2) 90%,transparent)}
.rule{height:1px;background:linear-gradient(90deg,transparent,var(--line-2) 18%,var(--line-2) 82%,transparent);border:0}

/* ---------- 6. Type ----------
   Headings run light and get heavier as they get smaller — the logotype sets
   the tone at display size, small labels stay legible.                       */
.eyebrow{
  display:flex;align-items:center;gap:12px;
  font-family:var(--mono);font-size:11.5px;font-weight:500;
  letter-spacing:.22em;text-transform:uppercase;color:var(--aqua);
  margin-bottom:20px;
}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--aqua);opacity:.6;flex:none}
.eyebrow--c{justify-content:center}
.eyebrow--c::after{content:"";width:26px;height:1px;background:var(--aqua);opacity:.6;flex:none}

h1,h2,h3,h4{line-height:1.2;letter-spacing:-.015em;font-weight:400;color:var(--ink)}
.h-xl{font-size:clamp(2.35rem,5.6vw,4.15rem);font-weight:300;letter-spacing:-.028em;line-height:1.08}
.h-lg{font-size:clamp(1.85rem,3.6vw,2.85rem);font-weight:300;letter-spacing:-.022em;line-height:1.18}
.h-md{font-size:clamp(1.35rem,2.2vw,1.72rem);font-weight:400;letter-spacing:-.016em;line-height:1.3}
.h-sm{font-size:1.08rem;font-weight:600;letter-spacing:-.008em;line-height:1.42}

html[lang="zh-Hant"] .h-xl,html[lang="ja"] .h-xl{letter-spacing:.005em;line-height:1.2}
html[lang="zh-Hant"] .h-lg,html[lang="ja"] .h-lg{letter-spacing:.01em;line-height:1.34}

.lede{font-size:clamp(1rem,1.5vw,1.14rem);color:var(--ink-2);line-height:1.8;max-width:62ch;font-weight:400}
.body{color:var(--ink-2);line-height:1.82}
.muted{color:var(--ink-3)}
.hl{color:var(--brand);font-weight:500}
.mono{font-family:var(--mono)}

.section-head{max-width:74ch;margin-bottom:clamp(40px,5vw,60px)}
.section-head--c{margin-inline:auto;text-align:center}
.section-head .lede{margin-top:18px}
.section-head--c .lede{margin-inline:auto}

/* ---------- 7. Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:14px 26px;border-radius:var(--r-sm);border:1px solid transparent;
  font-weight:500;font-size:.95rem;letter-spacing:.005em;cursor:pointer;
  transition:.32s var(--ease);white-space:nowrap;position:relative;
}
.btn svg{width:16px;height:16px;flex:none;transition:transform .32s var(--ease)}
.btn--pri{
  background:linear-gradient(135deg,var(--brand-lift) 0%,var(--brand) 55%,var(--brand-deep) 100%);
  color:#fff;box-shadow:0 8px 24px -10px rgba(53,28,153,.6);
}
.btn--pri:hover{transform:translateY(-2px);box-shadow:0 16px 34px -12px rgba(53,28,153,.7)}
.btn--pri:hover svg{transform:translateX(4px)}
.btn--ghost{background:#fff;border-color:var(--line-2);color:var(--ink)}
.btn--ghost:hover{border-color:var(--brand);background:var(--brand-soft);color:var(--brand-deep);transform:translateY(-2px)}
.btn--ghost:hover svg{transform:translateX(4px)}
.btn-row{display:flex;flex-wrap:wrap;gap:14px;margin-top:36px}
.btn-row--c{justify-content:center}

.textlink{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--mono);font-size:12px;font-weight:500;letter-spacing:.13em;text-transform:uppercase;
  color:var(--brand);transition:.3s var(--ease);
}
.textlink svg{width:14px;height:14px;transition:transform .3s var(--ease)}
.textlink:hover{color:var(--brand-deep)}
.textlink:hover svg{transform:translateX(5px)}

/* ---------- 8. Header ---------- */
.hdr{
  position:fixed;top:0;left:0;right:0;z-index:100;
  transition:background .4s var(--ease),border-color .4s var(--ease),box-shadow .4s var(--ease);
  border-bottom:1px solid transparent;
}
.hdr.is-stuck{
  background:rgba(255,255,255,.86);
  backdrop-filter:blur(18px) saturate(150%);
  -webkit-backdrop-filter:blur(18px) saturate(150%);
  border-bottom-color:var(--line);
  box-shadow:0 1px 20px -10px rgba(37,17,105,.28);
}
.hdr-in{display:flex;align-items:center;gap:clamp(18px,3vw,44px);height:76px}
.brand{display:flex;align-items:center;gap:13px;flex:none}
.brand img{height:38px;width:auto}
.brand-txt{display:flex;flex-direction:column;line-height:1.16}
.brand-txt b{font-size:15px;font-weight:500;letter-spacing:.005em;color:var(--ink)}
.brand-txt span{font-family:var(--mono);font-size:9.5px;letter-spacing:.2em;color:var(--ink-3);text-transform:uppercase}

.nav{display:flex;align-items:center;gap:4px;margin-left:auto}
.nav a{
  position:relative;padding:9px 15px;border-radius:7px;font-size:.9rem;font-weight:400;
  color:var(--ink-2);transition:.26s var(--ease);
}
.nav a:hover{color:var(--brand-deep);background:var(--brand-soft)}
.nav a.is-on{color:var(--brand-deep);font-weight:500}
.nav a.is-on::after{
  content:"";position:absolute;left:15px;right:15px;bottom:2px;height:1.5px;border-radius:2px;
  background:linear-gradient(90deg,var(--brand),var(--aqua));
}
.hdr-act{display:flex;align-items:center;gap:12px;flex:none}

/* Japanese nav labels are long; break them only at the <wbr> points,
   never mid-word the way CJK text wraps by default */
html[lang="ja"] .nav a{word-break:keep-all}

.langsw{display:flex;padding:3px;border:1px solid var(--line-2);border-radius:999px;background:#fff}
.langsw a{
  display:inline-flex;align-items:center;justify-content:center;
  padding:5px 10px;border-radius:999px;
  font-family:var(--mono);font-size:11px;font-weight:500;letter-spacing:.09em;
  color:var(--ink-3);transition:.26s var(--ease);text-decoration:none;
}
.langsw a:hover{color:var(--brand-deep);background:var(--brand-soft)}
.langsw a[aria-current="page"]{background:var(--brand);color:#fff}
.langsw a[aria-current="page"]:hover{background:var(--brand);color:#fff}

.burger{display:none;width:42px;height:42px;border:1px solid var(--line-2);border-radius:9px;
  background:#fff;cursor:pointer;align-items:center;justify-content:center;flex-direction:column;gap:5px}
.burger span{display:block;width:17px;height:1.5px;background:var(--ink);border-radius:2px;transition:.3s var(--ease)}
.burger.is-open span:nth-child(1){transform:translateY(6.5px) rotate(45deg)}
.burger.is-open span:nth-child(2){opacity:0}
.burger.is-open span:nth-child(3){transform:translateY(-6.5px) rotate(-45deg)}

/* ---------- 9. Hero ---------- */
.hero{position:relative;min-height:min(92vh,920px);display:flex;align-items:flex-end;
  padding-top:150px;padding-bottom:0;overflow:hidden}
.hero-bg{position:absolute;inset:0;z-index:0}
.hero-bg img{width:100%;height:100%;object-fit:cover;opacity:.5;
  filter:saturate(.62) brightness(1.12) contrast(.92)}
.hero-bg::after{
  content:"";position:absolute;inset:0;
  background:
    radial-gradient(ellipse 80% 62% at 24% 24%,rgba(53,28,153,.13),transparent 62%),
    linear-gradient(180deg,rgba(255,255,255,.9) 0%,rgba(255,255,255,.62) 34%,rgba(255,255,255,.9) 76%,var(--bg) 100%);
}
.hero-scan{position:absolute;inset:0;z-index:1;pointer-events:none;opacity:.5;
  background:repeating-linear-gradient(180deg,transparent 0 3px,rgba(53,28,153,.016) 3px 4px)}
.hero-in{position:relative;z-index:2;width:100%;padding-bottom:clamp(52px,7vw,86px)}
.hero h1{max-width:19ch}
.hero .lede{margin-top:26px;max-width:56ch}
.hero-tag{
  display:inline-flex;align-items:center;gap:11px;padding:7px 16px 7px 12px;margin-bottom:26px;
  border:1px solid var(--line-2);border-radius:999px;background:rgba(255,255,255,.78);
  backdrop-filter:blur(10px);
  font-family:var(--mono);font-size:11px;letter-spacing:.15em;text-transform:uppercase;color:var(--ink-2);
}
.hero-tag i{width:6px;height:6px;border-radius:50%;background:var(--aqua);flex:none;
  box-shadow:0 0 0 0 rgba(14,138,168,.55);animation:ping 2.6s infinite}
@keyframes ping{
  0%{box-shadow:0 0 0 0 rgba(14,138,168,.5)}
  70%{box-shadow:0 0 0 9px rgba(14,138,168,0)}
  100%{box-shadow:0 0 0 0 rgba(14,138,168,0)}
}
.grad-txt{
  background:linear-gradient(100deg,var(--brand) 4%,var(--brand-lift) 48%,var(--aqua) 96%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}

/* ---------- 10. Metric strip ---------- */
.metrics{
  display:grid;grid-template-columns:repeat(4,1fr);
  border:1px solid var(--line-2);border-radius:var(--r);overflow:hidden;
  background:rgba(255,255,255,.9);backdrop-filter:blur(14px);box-shadow:var(--sh);
}
.metric{padding:clamp(22px,2.6vw,30px);border-right:1px solid var(--line);position:relative}
.metric:last-child{border-right:0}
.metric::before{content:"";position:absolute;top:0;left:0;right:0;height:2px;
  background:linear-gradient(90deg,transparent,var(--brand),transparent);opacity:0;transition:.4s var(--ease)}
.metric:hover::before{opacity:1}
.metric b{
  display:block;font-family:var(--mono);font-weight:400;
  font-size:clamp(1.55rem,2.7vw,2.05rem);letter-spacing:-.03em;line-height:1.1;color:var(--brand-deep);
}
.metric small{display:block;margin-top:9px;font-family:var(--mono);font-size:10.5px;
  letter-spacing:.16em;text-transform:uppercase;color:var(--aqua)}
.metric em{display:block;margin-top:3px;font-style:normal;font-size:.82rem;color:var(--ink-3)}

/* ---------- 11. Cards ---------- */
.card{
  position:relative;padding:clamp(24px,2.6vw,32px);border-radius:var(--r);
  border:1px solid var(--line);background:#fff;box-shadow:var(--sh-sm);
  transition:.42s var(--ease);overflow:hidden;height:100%;
}
.card::before{                          /* top hairline that lights on hover */
  content:"";position:absolute;top:0;left:0;right:0;height:2px;
  background:linear-gradient(90deg,var(--brand),var(--aqua));
  opacity:0;transition:.42s var(--ease);
}
.card:hover{border-color:var(--line-3);transform:translateY(-4px);box-shadow:var(--sh-lg)}
.card:hover::before{opacity:1}
.card h3{margin-bottom:12px}
.card .body{font-size:.94rem}

.card-ico{
  width:46px;height:46px;border-radius:11px;display:grid;place-items:center;margin-bottom:20px;
  border:1px solid var(--line-2);background:var(--brand-soft);
  color:var(--brand);flex:none;
}
.card-ico svg{width:22px;height:22px;stroke:currentColor;fill:none;stroke-width:1.6;
  stroke-linecap:round;stroke-linejoin:round}

.card-num{
  position:absolute;top:22px;right:24px;font-family:var(--mono);font-size:11px;font-weight:500;
  letter-spacing:.16em;color:var(--ink-4);
}

/* tag chips (technology keywords) */
.chips{display:flex;flex-wrap:wrap;gap:7px;margin-top:20px}
.chip{
  font-family:var(--mono);font-size:10.5px;font-weight:500;letter-spacing:.09em;
  padding:4px 10px;border-radius:5px;border:1px solid var(--line-2);
  background:var(--brand-soft);color:var(--brand);white-space:nowrap;
}

.grid{display:grid;gap:20px}
.g-2{grid-template-columns:repeat(2,1fr)}
.g-3{grid-template-columns:repeat(3,1fr)}
.g-4{grid-template-columns:repeat(4,1fr)}

/* ---------- 12. Process flow ---------- */
.flow{position:relative;display:grid;grid-template-columns:repeat(6,1fr);gap:14px;margin-top:14px}
.flow::before{
  content:"";position:absolute;top:52px;left:6%;right:6%;height:1px;
  background:linear-gradient(90deg,rgba(53,28,153,.16),rgba(53,28,153,.34),rgba(53,28,153,.16));
}
.flow::after{                            /* travelling pulse = water moving through the train */
  content:"";position:absolute;top:51px;left:6%;right:6%;height:2px;border-radius:2px;
  background:linear-gradient(90deg,transparent 0%,transparent 40%,var(--aqua) 50%,transparent 60%,transparent 100%);
  background-size:280% 100%;
  animation:flowpulse 5.2s linear infinite;opacity:.95;
}
@keyframes flowpulse{from{background-position:-90% 0}to{background-position:190% 0}}
.step{position:relative;text-align:center}
.step-dot{
  width:38px;height:38px;margin:34px auto 18px;border-radius:50%;display:grid;place-items:center;
  font-family:var(--mono);font-size:12px;font-weight:500;color:var(--brand);
  border:1px solid var(--line-3);background:#fff;
  box-shadow:0 0 0 6px var(--bg),var(--sh-sm);position:relative;z-index:2;
  transition:.4s var(--ease);
}
.step:hover .step-dot{background:var(--brand);border-color:var(--brand);color:#fff;transform:scale(1.08)}
.step b{display:block;font-size:1rem;font-weight:600;letter-spacing:-.01em}
.step small{display:block;margin-top:6px;font-family:var(--mono);font-size:10.5px;
  letter-spacing:.1em;color:var(--aqua);line-height:1.6;text-transform:uppercase}
.step em{display:block;margin-top:7px;font-style:normal;font-size:.82rem;color:var(--ink-3);line-height:1.55}

/* ---------- 13. Spec / data tables ---------- */
.tbl-wrap{border:1px solid var(--line-2);border-radius:var(--r);overflow:hidden;background:#fff;box-shadow:var(--sh-sm)}
.tbl-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}
table.data{min-width:760px;font-size:.9rem}
table.data th,table.data td{padding:14px 18px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
table.data thead th{
  position:sticky;top:0;z-index:2;background:var(--surface-2);
  font-family:var(--mono);font-size:11px;font-weight:500;letter-spacing:.14em;text-transform:uppercase;
  color:var(--ink-2);border-bottom:1px solid var(--line-2);white-space:nowrap;
}
table.data tbody tr:last-child td{border-bottom:0}
table.data tbody tr{transition:background .25s var(--ease)}
table.data tbody tr:hover{background:var(--bg-2)}
table.data td:first-child,table.data th:first-child{font-weight:500;color:var(--ink);white-space:nowrap}
table.data td{color:var(--ink-2)}
table.data .num{font-family:var(--mono);font-size:.85rem;letter-spacing:-.01em}
.tbl-note{padding:13px 18px;border-top:1px solid var(--line);
  font-family:var(--mono);font-size:10.5px;letter-spacing:.1em;color:var(--ink-4);text-transform:uppercase}

/* simple spec list (label / value) */
.specs{border:1px solid var(--line-2);border-radius:var(--r);overflow:hidden;background:#fff;box-shadow:var(--sh-sm)}
.specs li{display:flex;justify-content:space-between;align-items:baseline;gap:20px;
  padding:14px 20px;border-bottom:1px solid var(--line);transition:background .25s}
.specs li:last-child{border-bottom:0}
.specs li:hover{background:var(--bg-2)}
.specs .k{font-size:.9rem;color:var(--ink-2)}
.specs .v{font-family:var(--mono);font-size:.9rem;font-weight:500;color:var(--ink);text-align:right}
.specs .v .hl{color:var(--brand)}

/* ---------- 14. Media ---------- */
.shot{position:relative;border-radius:var(--r);overflow:hidden;border:1px solid var(--line);
  background:var(--surface-2);box-shadow:var(--sh-sm)}
.shot img{width:100%;aspect-ratio:4/3;object-fit:cover;transition:transform .8s var(--ease)}
.shot:hover img{transform:scale(1.045)}
.shot::after{content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,transparent 46%,rgba(21,20,43,.62))}
.shot--wide img{aspect-ratio:16/9}
.shot--tall img{aspect-ratio:3/4}
.shot--free img{aspect-ratio:auto}
.shot-cap{
  position:absolute;left:0;right:0;bottom:0;z-index:2;padding:16px 18px;
  font-family:var(--mono);font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;
  color:rgba(255,255,255,.82);
}
.shot-cap b{display:block;font-family:var(--sans);font-size:.9rem;font-weight:500;
  letter-spacing:0;text-transform:none;color:#fff;margin-bottom:3px}

.split{display:grid;grid-template-columns:1fr 1fr;gap:clamp(30px,5vw,68px);align-items:center}
.split--r .split-media{order:2}

/* ---------- 15. Timeline ---------- */
.tl{position:relative;padding-left:34px}
.tl::before{content:"";position:absolute;left:7px;top:8px;bottom:8px;width:1px;
  background:linear-gradient(180deg,var(--brand),rgba(53,28,153,.28),transparent)}
.tl-item{position:relative;padding-bottom:38px}
.tl-item:last-child{padding-bottom:0}
.tl-item::before{
  content:"";position:absolute;left:-34px;top:7px;width:15px;height:15px;border-radius:50%;
  border:1px solid var(--line-3);background:#fff;box-shadow:0 0 0 4px var(--bg);
}
.tl-item::after{content:"";position:absolute;left:-30px;top:11px;width:7px;height:7px;border-radius:50%;background:var(--brand)}
.tl-yr{font-family:var(--mono);font-size:12px;font-weight:500;letter-spacing:.18em;color:var(--aqua);margin-bottom:7px}
.tl-item h3{margin-bottom:7px}

/* ---------- 16. Case blocks ---------- */
.case{border:1px solid var(--line);border-radius:var(--r);overflow:hidden;background:#fff;
  box-shadow:var(--sh-sm);transition:.42s var(--ease)}
.case:hover{border-color:var(--line-3);box-shadow:var(--sh-lg)}
.case-grid{display:grid;grid-template-columns:1.05fr 1fr}
.case-media{position:relative;min-height:320px;overflow:hidden;background:var(--surface-2)}
.case-media img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;
  transition:transform .9s var(--ease)}
.case:hover .case-media img{transform:scale(1.05)}
/* bias the cover-crop towards the right of the photo, for shots whose
   subject sits off-centre and would otherwise be cut by the portrait frame */
.case-media--right img{object-position:90% 50%}
.case-media::after{content:"";position:absolute;inset:0;
  background:linear-gradient(100deg,rgba(53,28,153,.10),rgba(21,20,43,.20))}
.case-body{padding:clamp(28px,3.4vw,42px)}
.case-badge{
  display:inline-flex;align-items:center;gap:9px;padding:5px 13px;border-radius:999px;margin-bottom:18px;
  border:1px solid var(--line-2);background:var(--aqua-soft);
  font-family:var(--mono);font-size:10.5px;font-weight:500;letter-spacing:.14em;text-transform:uppercase;color:var(--aqua);
}
.case-kv{display:grid;grid-template-columns:repeat(2,1fr);gap:1px;margin:24px 0;
  background:var(--line);border:1px solid var(--line);border-radius:10px;overflow:hidden}
.case-kv div{background:var(--surface-2);padding:13px 16px}
.case-kv dt{font-family:var(--mono);font-size:10px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-4);margin-bottom:5px}
.case-kv dd{font-family:var(--mono);font-size:.92rem;font-weight:500;color:var(--brand-deep)}
.wins li{position:relative;padding-left:26px;margin-bottom:14px;font-size:.92rem;color:var(--ink-2);line-height:1.7}
.wins li:last-child{margin-bottom:0}
.wins li::before{
  content:"";position:absolute;left:0;top:8px;width:11px;height:7px;
  border-left:1.6px solid var(--brand);border-bottom:1.6px solid var(--brand);transform:rotate(-45deg);
}
.wins strong{display:block;color:var(--ink);font-weight:600;margin-bottom:2px}

/* ---------- 17. CTA band — the one deep-brand moment on a light page ------ */
.cta{
  position:relative;border-radius:var(--r);overflow:hidden;
  padding:clamp(40px,5.5vw,72px);text-align:center;
  background:linear-gradient(140deg,var(--brand-lift) 0%,var(--brand) 45%,var(--brand-deep) 100%);
  box-shadow:var(--sh-lg);
}
.cta::before{content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(to right,rgba(255,255,255,.07) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(255,255,255,.07) 1px,transparent 1px);
  background-size:44px 44px;
  -webkit-mask-image:radial-gradient(ellipse 62% 88% at 50% 42%,#000,transparent 74%);
          mask-image:radial-gradient(ellipse 62% 88% at 50% 42%,#000,transparent 74%)}
.cta > *{position:relative;z-index:1}
.cta h2{color:#fff}
.cta .lede{margin:18px auto 0;color:rgba(255,255,255,.82)}
.cta .eyebrow{color:rgba(255,255,255,.72)}
.cta .eyebrow::before,.cta .eyebrow::after{background:rgba(255,255,255,.6)}
.cta .btn--pri{background:#fff;color:var(--brand-deep);box-shadow:0 8px 24px -10px rgba(0,0,0,.4)}
.cta .btn--pri:hover{background:#fff;box-shadow:0 16px 34px -12px rgba(0,0,0,.5)}
.cta .btn--ghost{background:transparent;border-color:rgba(255,255,255,.4);color:#fff}
.cta .btn--ghost:hover{background:rgba(255,255,255,.12);border-color:#fff;color:#fff}

/* ---------- 18. Contact ---------- */
.field{margin-bottom:18px}
.field label{display:block;font-family:var(--mono);font-size:10.5px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--ink-3);margin-bottom:8px}
.field input,.field textarea,.field select{
  width:100%;padding:13px 16px;border-radius:var(--r-sm);
  border:1px solid var(--line-2);background:#fff;color:var(--ink);
  font-size:.94rem;transition:.28s var(--ease);
}
.field textarea{min-height:132px;resize:vertical}
.field input:focus,.field textarea:focus,.field select:focus{
  outline:none;border-color:var(--brand);
  box-shadow:0 0 0 3px rgba(53,28,153,.12)}
.field input::placeholder,.field textarea::placeholder{color:var(--ink-4)}
.f-2{display:grid;grid-template-columns:1fr 1fr;gap:0 18px}

.contact-row{display:flex;gap:16px;padding:20px 0;border-bottom:1px solid var(--line);align-items:flex-start}
.contact-row:last-child{border-bottom:0}
.contact-row .card-ico{margin-bottom:0;width:40px;height:40px;border-radius:9px}
.contact-row .card-ico svg{width:18px;height:18px}
.contact-row b{display:block;font-family:var(--mono);font-size:10.5px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--ink-3);font-weight:500;margin-bottom:5px}
.contact-row p{font-size:.96rem;color:var(--ink);line-height:1.6}
.contact-row a:hover{color:var(--brand)}

/* ---------- 19. Footer ---------- */
.ftr{position:relative;z-index:1;border-top:1px solid var(--line);background:var(--bg-2);margin-top:clamp(40px,6vw,90px)}
.ftr-top{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:clamp(26px,4vw,54px);padding-block:clamp(48px,6vw,72px)}
.ftr h4{font-family:var(--mono);font-size:10.5px;font-weight:500;letter-spacing:.18em;
  text-transform:uppercase;color:var(--ink-3);margin-bottom:18px}
.ftr li{margin-bottom:11px;font-size:.9rem;color:var(--ink-2)}
.ftr li a{transition:.25s var(--ease)}
.ftr li a:hover{color:var(--brand)}
.ftr-brand img{height:58px;width:auto;margin-bottom:18px}
.ftr-brand p{font-size:.89rem;color:var(--ink-3);line-height:1.75;max-width:34ch}
.ftr-bot{display:flex;flex-wrap:wrap;gap:14px;justify-content:space-between;align-items:center;
  padding-block:22px;border-top:1px solid var(--line);
  font-family:var(--mono);font-size:10.5px;letter-spacing:.1em;color:var(--ink-4);text-transform:uppercase}
.sites{display:flex;flex-wrap:wrap;gap:10px}
.site-chip{display:inline-flex;align-items:center;gap:7px;padding:5px 11px;border-radius:6px;
  border:1px solid var(--line);background:#fff;
  font-family:var(--mono);font-size:10px;letter-spacing:.1em;color:var(--ink-3)}
.site-chip i{width:5px;height:5px;border-radius:50%;background:var(--brand);flex:none}

/* ---------- 20. Page hero (interior pages) ---------- */
.phero{position:relative;padding-top:168px;padding-bottom:clamp(46px,5.5vw,72px);overflow:hidden}
.phero-bg{position:absolute;inset:0;z-index:0}
.phero-bg img{width:100%;height:100%;object-fit:cover;opacity:.34;filter:saturate(.55) brightness(1.14)}
.phero-bg::after{content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(255,255,255,.92),rgba(255,255,255,.72) 42%,var(--bg))}
.phero .wrap{position:relative;z-index:1}
.crumb{display:flex;align-items:center;gap:9px;margin-bottom:20px;
  font-family:var(--mono);font-size:10.5px;letter-spacing:.15em;text-transform:uppercase;color:var(--ink-4)}
.crumb a:hover{color:var(--brand)}
.crumb span{color:var(--aqua)}

/* ---------- 21. Reveal ---------- */
.rv{opacity:0;transform:translateY(22px);transition:opacity .82s var(--ease),transform .82s var(--ease)}
html:not(.js) .rv{opacity:1;transform:none}   /* JS blocked or failed: show everything */
.rv.in{opacity:1;transform:none}
.rv-d1{transition-delay:.08s}.rv-d2{transition-delay:.16s}.rv-d3{transition-delay:.24s}
.rv-d4{transition-delay:.32s}.rv-d5{transition-delay:.4s}.rv-d6{transition-delay:.48s}

/* ---------- 22. Responsive ---------- */
@media (max-width:1040px){
  /* seven nav items: hand over to the drawer well before the header gets tight */
  .nav{
    position:fixed;top:76px;left:0;right:0;
    flex-direction:column;align-items:stretch;gap:2px;padding:16px var(--gut) 26px;
    background:rgba(255,255,255,.98);backdrop-filter:blur(20px);
    border-bottom:1px solid var(--line);box-shadow:var(--sh);
    transform:translateY(-14px);opacity:0;pointer-events:none;transition:.32s var(--ease);
  }
  .nav.is-open{transform:none;opacity:1;pointer-events:auto}
  .nav a{padding:13px 14px;font-size:.98rem;border-radius:8px}
  .nav a.is-on::after{left:14px;right:auto;width:20px}
  .burger{display:flex}
  .ftr-top{grid-template-columns:1fr 1fr}
  .flow{grid-template-columns:repeat(3,1fr);row-gap:26px}
  .flow::before,.flow::after{display:none}
  .step-dot{margin-top:0}
}
@media (max-width:900px){
  .g-3,.g-4{grid-template-columns:repeat(2,1fr)}
  .metrics{grid-template-columns:repeat(2,1fr)}
  .metric:nth-child(2n){border-right:0}
  .metric:nth-child(-n+2){border-bottom:1px solid var(--line)}
  .split{grid-template-columns:1fr;gap:32px}
  .split--r .split-media{order:0}
  .case-grid{grid-template-columns:1fr}
  .case-media{min-height:230px}
  /* a portrait photograph needs a taller frame once the case stacks to one column */
  .case--portrait .case-media{min-height:0;aspect-ratio:4/5}
}
@media (max-width:620px){
  .g-2,.g-3,.g-4{grid-template-columns:1fr}
  .flow{grid-template-columns:repeat(2,1fr)}
  .ftr-top{grid-template-columns:1fr}
  .f-2{grid-template-columns:1fr}
  .case-kv{grid-template-columns:1fr}
  .brand-txt{display:none}
  .hero{min-height:auto;padding-top:126px}
  .metrics{grid-template-columns:1fr}
  .metric{border-right:0;border-bottom:1px solid var(--line)}
  .metric:last-child{border-bottom:0}
  .specs li{flex-direction:column;gap:5px}
  .specs .v{text-align:left}
}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;
    transition-duration:.001ms !important;scroll-behavior:auto !important}
  .rv{opacity:1;transform:none}
}

/* ---------- 23. Print ---------- */
@media print{
  .hdr,.ambient,.burger,.langsw,.cta,.hero-scan{display:none !important}
  body{background:#fff;color:#111}
  .card,.tbl-wrap,.case{border-color:#ccc;background:#fff;box-shadow:none}
}

/* ---------- 24. Utilities ---------- */
.mt-s{margin-top:14px}
.mt-m{margin-top:22px}
.mt-l{margin-top:clamp(38px,4.6vw,58px)}
.mt-xl{margin-top:clamp(46px,6vw,74px)}
.mb-m{margin-bottom:22px}
.g-tight{gap:12px}
.center{text-align:center}
.stack > * + *{margin-top:20px}
.maxw-sm{max-width:58ch}

/* English strapline under a Chinese heading (shown in ZH mode only) */
.sub{display:block;margin-top:4px;font-family:var(--mono);font-size:10.5px;font-weight:500;
  letter-spacing:.13em;text-transform:uppercase;color:var(--ink-4)}

/* compact stat tiles */
.metric-mini{display:block;font-family:var(--mono);font-size:1.5rem;font-weight:400;
  letter-spacing:-.03em;line-height:1.1;color:var(--brand-deep)}
.mono-lbl{display:block;margin-top:6px;font-family:var(--mono);font-size:10px;
  letter-spacing:.13em;text-transform:uppercase;color:var(--ink-3);line-height:1.5}
.grid.g-tight .card{padding:18px 16px;text-align:center}

/* card with a media header */
.card--media{padding:0;display:flex;flex-direction:column}
.card--media .shot{border:0;border-radius:0;border-bottom:1px solid var(--line);box-shadow:none}
.card--media .card-in{padding:clamp(22px,2.4vw,28px);flex:1;display:flex;flex-direction:column;align-items:flex-start}
.card--media .card-in .textlink{margin-top:auto;padding-top:20px}
.card--media .case-badge{margin-bottom:14px}

/* ---------- 25. Equations & map ---------- */
.eq{
  margin-top:18px;padding:16px 20px;border-radius:var(--r-sm);
  border:1px solid var(--line-2);border-left:2px solid var(--brand);
  background:var(--brand-soft);
  font-family:var(--mono);font-size:1rem;font-weight:500;letter-spacing:.01em;color:var(--brand-deep);
  overflow-x:auto;white-space:nowrap;
}
.eq-sm{font-size:.78em;color:var(--aqua)}

.map{border:1px solid var(--line-2);border-radius:var(--r);overflow:hidden;
  background:var(--surface-2);box-shadow:var(--sh-sm)}
.map iframe{display:block;width:100%;height:clamp(300px,42vw,440px);border:0}

/* ---------- 26. Water-grade page ---------- */
.grade-cost{font-family:var(--mono);font-size:1rem;letter-spacing:.2em;color:var(--brand)}
.grade-cost .off{color:var(--ink-4);opacity:.45}

/* parameter glossary */
.gloss{border:1px solid var(--line-2);border-radius:var(--r);overflow:hidden;background:#fff;box-shadow:var(--sh-sm)}
.gloss > li{display:grid;grid-template-columns:210px 1fr;gap:clamp(16px,3vw,32px);
  padding:20px 22px;border-bottom:1px solid var(--line);transition:background .25s var(--ease)}
.gloss > li:last-child{border-bottom:0}
.gloss > li:hover{background:var(--bg-2)}
.gloss-k b{display:block;font-size:1rem;font-weight:600;letter-spacing:-.008em}
.gloss-k small{display:block;margin-top:3px;font-family:var(--mono);font-size:10.5px;
  letter-spacing:.13em;text-transform:uppercase;color:var(--ink-4)}
/* units are case-sensitive - render them exactly as authored */
.gloss-k small.unit{text-transform:none}
.gloss-v .body{font-size:.93rem}
.gloss-v .tag{display:inline-block;margin-top:10px;font-family:var(--mono);font-size:11px;
  letter-spacing:.09em;padding:3px 9px;border-radius:5px;
  border:1px solid var(--line-2);background:var(--aqua-soft);color:var(--aqua);transition:.25s var(--ease)}
a.tag:hover{background:var(--brand-soft);border-color:var(--line-3);color:var(--brand)}

/* application -> grade picker */
.pick{display:grid;grid-template-columns:1fr auto;gap:18px;align-items:center;
  padding:15px 20px;border-bottom:1px solid var(--line)}
.pick:last-child{border-bottom:0}
.pick-b{font-family:var(--mono);font-size:11px;font-weight:500;letter-spacing:.12em;
  padding:5px 12px;border-radius:999px;white-space:nowrap}
.pick-b.is-ro{border:1px solid var(--line-2);background:var(--surface-2);color:var(--ink-2)}
.pick-b.is-di{border:1px solid var(--line-2);background:var(--aqua-soft);color:var(--aqua)}
.pick-b.is-upw{border:1px solid transparent;background:var(--brand);color:#fff}

@media (max-width:700px){
  .gloss > li{grid-template-columns:1fr;gap:8px}
  .pick{grid-template-columns:1fr;gap:10px;align-items:flex-start}
}

/* seven nav items need a little more room just above the drawer breakpoint */
@media (max-width:1200px) and (min-width:1041px){
  .hdr-in{gap:16px}
  .nav a{padding:9px 10px;font-size:.85rem}
  .nav a.is-on::after{left:10px;right:10px}
}

/* jump-to-case links on the (now long) case studies page */
.jump a.chip{transition:.25s var(--ease)}
.jump a.chip:hover{background:var(--brand);border-color:var(--brand);color:#fff}

/* ---------- 23. Mobile performance ----------
   filter/backdrop-filter on a position:fixed layer forces the compositor to
   re-blur on every scroll frame. iOS Safari pays the most for it, so on small
   screens the blurs are swapped for flat fills — visually near-identical at
   this size, far cheaper to scroll. */
@media (max-width:1040px){
  .hdr.is-stuck{
    backdrop-filter:none;-webkit-backdrop-filter:none;
    background:rgba(255,255,255,.97);
  }
  .nav{backdrop-filter:none;-webkit-backdrop-filter:none;background:#fff}
}
@media (max-width:900px){
  .orb{display:none}                       /* three 540-720px blur(100px) circles */
  .hero-tag{backdrop-filter:none;-webkit-backdrop-filter:none;background:rgba(255,255,255,.92)}
  .metrics{backdrop-filter:none;-webkit-backdrop-filter:none;background:#fff}
  .hero-bg img,.phero-bg img{filter:none}  /* saturate/brightness on a full-bleed image */
}
@media (prefers-reduced-motion:reduce){
  .orb{display:none}
  *,*::before,*::after{animation-duration:.01ms !important;transition-duration:.01ms !important}
}