/* ============================================================
   C-LOT HOMES — shared stylesheet
   Architectural editorial · safety-yellow accent · bilingual
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Archivo:wght@400;500;600;700;800;900&family=Newsreader:ital,opsz,wght@0,18..72,300;0,18..72,400;0,18..72,500;1,18..72,300;1,18..72,400&family=Space+Mono:wght@400;700&family=Noto+Sans+SC:wght@400;500;700;900&family=Noto+Serif+SC:wght@300;400;600&display=swap');

/* ---------- tokens ---------- */
:root{
  --ink:#1b2431;            /* slate-navy ink */
  --ink-soft:#55626f;       /* muted slate */
  --paper:#eef0f1;          /* cool concrete off-white */
  --paper-2:#e3e7e9;        /* slightly deeper cool paper */
  --concrete:#ccd3d7;       /* cool concrete */
  --concrete-line:#b7c0c5;
  --accent:#f2c200;         /* safety yellow */
  --accent-deep:#c79c00;
  --line:rgba(27,36,49,.15);
  --line-strong:rgba(27,36,49,.32);
  --white:#ffffff;
  /* dark surfaces — blue family */
  --night:#1b2431;          /* primary dark background */
  --night-2:#27313f;        /* raised dark (cards / placeholders) */
  --night-deep:#141b25;     /* deepest (footer) */

  --f-sans:'Archivo','Noto Sans SC',system-ui,sans-serif;
  --f-serif:'Newsreader','Noto Serif SC',Georgia,serif;
  --f-mono:'Space Mono','Noto Sans SC',ui-monospace,monospace;

  --container:1340px;
  --gutter:clamp(20px,5vw,72px);
  --header-h:74px;
}

*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  font-family:var(--f-sans);
  background:var(--paper);
  color:var(--ink);
  line-height:1.5;
  font-size:17px;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
:lang(zh) body, html[lang="zh"] body{line-height:1.7}

img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer}

/* ---------- layout helpers ---------- */
.container{max-width:var(--container);margin:0 auto;padding-inline:var(--gutter)}
.section{padding-block:clamp(64px,9vw,140px)}
.section-sm{padding-block:clamp(44px,6vw,90px)}
.bleed{padding-inline:var(--gutter)}
.dark{background:var(--night);color:var(--paper)}
.dark .rule,.dark hr{border-color:rgba(244,241,232,.18)}
.accentbg{background:var(--accent);color:var(--ink)}
.cols{display:grid;gap:clamp(28px,5vw,72px)}
@media(min-width:880px){.cols-2{grid-template-columns:1fr 1fr}.cols-2-13{grid-template-columns:1fr 1.6fr}.cols-2-31{grid-template-columns:1.6fr 1fr}}

hr,.rule{border:none;border-top:1px solid var(--line);margin:0}

/* ---------- type ---------- */
.eyebrow{
  font-family:var(--f-mono);
  font-size:12px;
  letter-spacing:.22em;
  text-transform:uppercase;
  font-weight:700;
  display:inline-flex;
  align-items:center;
  gap:.7em;
  color:var(--ink-soft);
}
.dark .eyebrow{color:var(--accent)}
.eyebrow .num{color:var(--accent)}
.dark .eyebrow .num{color:var(--accent)}

.display{
  font-weight:800;
  text-transform:uppercase;
  line-height:.92;
  letter-spacing:-.02em;
  font-size:clamp(2.6rem,8vw,7.4rem);
}
.h1{font-weight:800;text-transform:uppercase;line-height:.95;letter-spacing:-.018em;font-size:clamp(2.2rem,5.5vw,4.6rem)}
.h2{font-weight:800;text-transform:uppercase;line-height:1;letter-spacing:-.015em;font-size:clamp(1.7rem,3.4vw,3rem)}
.h3{font-weight:700;text-transform:uppercase;line-height:1.05;letter-spacing:-.01em;font-size:clamp(1.15rem,1.8vw,1.5rem)}
html[lang="zh"] .display,html[lang="zh"] .h1,html[lang="zh"] .h2,html[lang="zh"] .h3{letter-spacing:.02em;font-weight:900}

.serif{font-family:var(--f-serif);text-transform:none;font-weight:300;letter-spacing:0}
.lead{font-family:var(--f-serif);font-weight:300;font-size:clamp(1.25rem,2vw,1.7rem);line-height:1.42;color:var(--ink-soft)}
.dark .lead{color:rgba(244,241,232,.78)}
.lead em{font-style:italic;color:var(--ink)}
.dark .lead em{color:var(--paper)}
.mono{font-family:var(--f-mono);font-size:13px;letter-spacing:.02em}
.muted{color:var(--ink-soft)}
.dark .muted{color:rgba(244,241,232,.66)}

/* ---------- buttons ---------- */
.btn{
  --bg:var(--ink);--fg:var(--paper);
  display:inline-flex;align-items:center;gap:.7em;
  background:var(--bg);color:var(--fg);
  font-family:var(--f-sans);font-weight:700;text-transform:uppercase;
  letter-spacing:.04em;font-size:14px;
  padding:18px 26px;border:1px solid var(--bg);
  transition:transform .18s ease,background .18s ease,color .18s ease;
  white-space:nowrap;
}
.btn .arr{transition:transform .2s ease}
.btn:hover{transform:translateY(-2px)}
.btn:hover .arr{transform:translateX(4px)}
.btn-accent{--bg:var(--accent);--fg:var(--ink);border-color:var(--accent)}
.btn-accent:hover{--bg:var(--accent-deep)}
.btn-ghost{--bg:transparent;--fg:var(--ink);border-color:var(--line-strong)}
.btn-ghost:hover{--bg:var(--ink);--fg:var(--paper)}
.dark .btn-ghost{--fg:var(--paper);border-color:rgba(244,241,232,.35)}
.dark .btn-ghost:hover{--bg:var(--paper);--fg:var(--ink)}
.btn-lg{padding:22px 34px;font-size:15px}

.link-arrow{font-family:var(--f-mono);font-size:13px;font-weight:700;text-transform:uppercase;letter-spacing:.06em;display:inline-flex;gap:.6em;align-items:center;border-bottom:2px solid var(--accent);padding-bottom:4px;transition:gap .2s ease}
.link-arrow:hover{gap:1em}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(244,241,232,.88);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
}
.site-header.on-dark{background:rgba(20,27,37,.86);border-color:rgba(244,241,232,.14);color:var(--paper)}
.nav{display:flex;align-items:center;justify-content:space-between;height:var(--header-h)}
.brand{display:flex;align-items:baseline;gap:.5ch;font-weight:900;text-transform:uppercase;letter-spacing:-.03em;font-size:23px}
.brand .dot{color:var(--accent)}
.brand .sub{font-family:var(--f-mono);font-size:10px;letter-spacing:.24em;font-weight:700;align-self:center;margin-left:.4ch;color:var(--ink-soft)}
.on-dark .brand .sub{color:rgba(244,241,232,.6)}
.nav-links{display:none;gap:clamp(16px,2vw,34px);align-items:center}
@media(min-width:1000px){.nav-links{display:flex}}
.nav-links a{font-family:var(--f-mono);font-size:12.5px;font-weight:700;text-transform:uppercase;letter-spacing:.08em;padding:6px 0;position:relative;color:inherit;opacity:.78}
.nav-links a:hover{opacity:1}
.nav-links a.active{opacity:1}
.nav-links a.active::after{content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;background:var(--accent)}
.nav-right{display:flex;align-items:center;gap:14px}

.lang-toggle{display:inline-flex;border:1px solid var(--line-strong);border-radius:999px;overflow:hidden;font-family:var(--f-mono);font-size:11.5px;font-weight:700;letter-spacing:.05em}
.on-dark .lang-toggle{border-color:rgba(244,241,232,.3)}
.lang-toggle button{background:transparent;color:inherit;border:none;padding:7px 13px;opacity:.55;transition:.15s;white-space:nowrap}
.lang-toggle button.active{background:var(--accent);color:var(--ink);opacity:1}
.nav-cta{display:none}
@media(min-width:640px){.nav-cta{display:inline-flex}}
.btn-sm{padding:11px 18px;font-size:12.5px}

.burger{display:flex;flex-direction:column;gap:5px;background:none;border:none;padding:8px;color:inherit}
@media(min-width:1000px){.burger{display:none}}
.burger span{width:24px;height:2px;background:currentColor;display:block;transition:.2s}
.mobile-menu{display:none;flex-direction:column;border-top:1px solid var(--line);padding:14px var(--gutter) 26px;gap:2px;background:var(--paper)}
.on-dark .mobile-menu{background:var(--night);border-color:rgba(244,241,232,.14)}
.mobile-menu.open{display:flex}
.mobile-menu a{font-family:var(--f-mono);font-size:14px;font-weight:700;text-transform:uppercase;letter-spacing:.06em;padding:12px 0;border-bottom:1px solid var(--line)}
.on-dark .mobile-menu a{border-color:rgba(244,241,232,.12)}

/* ---------- placeholder imagery ---------- */
.ph{
  position:relative;
  background:var(--concrete);
  background-image:
    linear-gradient(135deg,rgba(27,36,49,.06) 0 1px,transparent 1px),
    linear-gradient(45deg,rgba(27,36,49,.06) 0 1px,transparent 1px);
  background-size:26px 26px;
  overflow:hidden;
  display:flex;align-items:flex-end;
  color:var(--ink-soft);
}
.ph::before{
  content:"";position:absolute;inset:14px;border:1px solid var(--line);
  pointer-events:none;
}
.ph .ph-tag{
  font-family:var(--f-mono);font-size:11px;font-weight:700;letter-spacing:.14em;
  text-transform:uppercase;padding:14px 16px;position:relative;z-index:1;
  display:flex;justify-content:space-between;width:100%;
}
.ph .ph-x{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:34px;height:34px;opacity:.5}
.ph .ph-x::before,.ph .ph-x::after{content:"";position:absolute;background:var(--ink-soft)}
.ph .ph-x::before{left:50%;top:0;bottom:0;width:1px;transform:translateX(-.5px)}
.ph .ph-x::after{top:50%;left:0;right:0;height:1px;transform:translateY(-.5px)}
.ph.ph-dark{background:var(--night-2);color:rgba(244,241,232,.5)}
.ph.ph-dark::before{border-color:rgba(244,241,232,.16)}
.ph.ph-dark .ph-x::before,.ph.ph-dark .ph-x::after{background:rgba(244,241,232,.4)}
.ph.ph-accent{background:var(--accent);color:rgba(27,36,49,.75)}
.ratio-4-3{aspect-ratio:4/3}
.ratio-3-2{aspect-ratio:3/2}
.ratio-1-1{aspect-ratio:1/1}
.ratio-16-9{aspect-ratio:16/9}
.ratio-3-4{aspect-ratio:3/4}
.ratio-2-3{aspect-ratio:2/3}

/* ---------- footer ---------- */
.site-footer{background:var(--night-deep);color:var(--paper)}
.footer-grid{display:grid;gap:40px;padding-block:clamp(56px,7vw,96px)}
@media(min-width:760px){.footer-grid{grid-template-columns:1.4fr 1fr 1fr}}
.footer-grid .h2{margin-bottom:18px}
.footer-col h4{font-family:var(--f-mono);font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--accent);margin-bottom:16px}
.footer-col a{display:block;padding:7px 0;opacity:.78;font-size:15px}
.footer-col a:hover{opacity:1}
.footer-bottom{border-top:1px solid rgba(244,241,232,.16);padding-block:22px;display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;font-family:var(--f-mono);font-size:11.5px;letter-spacing:.05em;text-transform:uppercase;opacity:.6}

/* ---------- reusable blocks ---------- */
.stat-strip{display:grid;gap:1px;background:var(--line)}
@media(min-width:680px){.stat-strip{grid-template-columns:repeat(4,1fr)}}
.stat{background:var(--paper);padding:clamp(24px,3vw,40px) clamp(20px,2.4vw,32px)}
.dark .stat{background:var(--night)}
.accentbg .stat{background:var(--accent)}
.stat .num{font-weight:800;font-size:clamp(2.4rem,5vw,4rem);line-height:.9;letter-spacing:-.03em;display:flex;align-items:flex-start;gap:.05em}
.stat .num sup{font-size:.4em;color:var(--accent);font-weight:800;margin-top:.3em}
.accentbg .stat .num sup{color:var(--ink)}
.stat .lbl{font-family:var(--f-mono);font-size:12px;letter-spacing:.08em;text-transform:uppercase;margin-top:12px;color:var(--ink-soft)}
.dark .stat .lbl{color:rgba(244,241,232,.65)}

.tag{display:inline-block;font-family:var(--f-mono);font-size:11px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;border:1px solid var(--line-strong);padding:6px 11px;border-radius:999px}
.dark .tag{border-color:rgba(244,241,232,.3)}
.tag.solid{background:var(--ink);color:var(--paper);border-color:var(--ink)}

/* index list (services / process) */
.idx-row{display:grid;grid-template-columns:auto 1fr auto;gap:clamp(16px,3vw,48px);align-items:start;padding:clamp(26px,3.5vw,46px) 0;border-top:1px solid var(--line);transition:padding-left .25s ease}
.idx-row:last-child{border-bottom:1px solid var(--line)}
.idx-row .idx-n{font-family:var(--f-mono);font-size:13px;font-weight:700;color:var(--accent-deep);padding-top:.5em}
.idx-row .idx-title{font-weight:800;text-transform:uppercase;letter-spacing:-.01em;font-size:clamp(1.4rem,2.6vw,2.2rem);line-height:1}
.idx-row .idx-body{max-width:46ch;color:var(--ink-soft);margin-top:14px;font-size:15.5px}
.idx-row .idx-arr{font-size:24px;align-self:center;transition:transform .25s ease;color:var(--accent-deep)}
.idx-row:hover{padding-left:14px}
.idx-row:hover .idx-arr{transform:translateX(8px)}
@media(max-width:640px){.idx-row{grid-template-columns:auto 1fr}.idx-row .idx-arr{display:none}}

/* card */
.card{background:var(--paper);border:1px solid var(--line)}
.card .card-body{padding:clamp(20px,2.4vw,30px)}
.card .card-body h3{margin-bottom:10px}

/* testimonial */
.quote{font-family:var(--f-serif);font-weight:300;font-size:clamp(1.5rem,3.2vw,2.6rem);line-height:1.28;letter-spacing:-.01em}
.quote em{font-style:italic}

/* form */
.field{display:flex;flex-direction:column;gap:8px;margin-bottom:20px}
.field label{font-family:var(--f-mono);font-size:11px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-soft)}
.dark .field label{color:rgba(244,241,232,.7)}
.field input,.field textarea,.field select{
  font-family:var(--f-sans);font-size:16px;color:var(--ink);
  background:var(--white);border:1px solid var(--line-strong);
  padding:15px 16px;width:100%;transition:border-color .15s,box-shadow .15s;
}
.dark .field input,.dark .field textarea,.dark .field select{background:rgba(244,241,232,.05);border-color:rgba(244,241,232,.25);color:var(--paper)}
.field input:focus,.field textarea:focus,.field select:focus{outline:none;border-color:var(--ink);box-shadow:0 0 0 3px var(--accent)}
.dark .field input:focus,.dark .field textarea:focus,.dark .field select:focus{border-color:var(--accent)}
.field textarea{resize:vertical;min-height:120px}
.chip-row{display:flex;flex-wrap:wrap;gap:10px}
.chip{font-family:var(--f-mono);font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.05em;padding:11px 16px;border:1px solid var(--line-strong);background:transparent;color:inherit;transition:.15s}
.chip[aria-pressed="true"]{background:var(--accent);border-color:var(--accent);color:var(--ink)}
.dark .chip{border-color:rgba(244,241,232,.28)}

/* reveal animation */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .7s cubic-bezier(.2,.6,.2,1),transform .7s cubic-bezier(.2,.6,.2,1)}
.reveal.in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}}

/* utilities */
.mt-s{margin-top:18px}.mt-m{margin-top:30px}.mt-l{margin-top:48px}
.mb-m{margin-bottom:30px}.mb-l{margin-bottom:48px}
.flex{display:flex}.wrap{flex-wrap:wrap}.gap-s{gap:12px}.gap-m{gap:20px}.gap-l{gap:32px}
.aic{align-items:center}.jcb{justify-content:space-between}.jce{justify-content:flex-end}
.maxw-60{max-width:60ch}.maxw-46{max-width:46ch}.maxw-34{max-width:34ch}
.tr{text-align:right}.tc{text-align:center}
.zh-only{display:none}
.hide{display:none!important}