/* ============================================================
   YiQi Culture Media — shared stylesheet
   System: warm-paper canvas, deep ink, single vermilion accent.
   The brand's colour lives in the logo + a sparing gradient rule.
   Type: Space Grotesk (display) · IBM Plex Sans (text) · IBM Plex Mono (labels)
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=IBM+Plex+Sans:wght@400;500;600&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root{
  --paper:#f3eee6;
  --paper-soft:#eae2d6;
  --card:#fbf9f4;
  --ink:#1a1815;
  --ink-2:#3b352e;
  --ink-soft:#6c6459;
  --line:rgba(26,24,21,.13);
  --line-strong:rgba(26,24,21,.26);
  --accent:#d8451c;
  --accent-ink:#b5380f;
  --grad:linear-gradient(90deg,#e8551e 0%,#d83a8e 34%,#2e8bc9 66%,#4fa45a 100%);
  --grad-soft:linear-gradient(120deg,#e8551e,#d83a8e,#2e8bc9,#4fa45a);
  --maxw:1240px;
  --pad:clamp(20px,5vw,72px);
  --r:14px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:'IBM Plex Sans',system-ui,sans-serif;
  background:var(--paper);
  color:var(--ink);
  line-height:1.55;
  font-size:17px;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
::selection{background:var(--accent);color:#fff}

/* ---------- type ---------- */
h1,h2,h3,h4{font-family:'Space Grotesk',sans-serif;font-weight:600;line-height:1.02;letter-spacing:-.02em;color:var(--ink)}
.display{font-size:clamp(2.6rem,7.2vw,6.4rem);font-weight:700;line-height:.96;letter-spacing:-.035em}
h2.section-title{font-size:clamp(2rem,4.4vw,3.5rem);letter-spacing:-.03em}
h3{font-size:clamp(1.3rem,2vw,1.65rem);letter-spacing:-.015em}
p{text-wrap:pretty}
.lead{font-size:clamp(1.15rem,1.7vw,1.45rem);line-height:1.45;color:var(--ink-2);font-weight:400}

.eyebrow{
  font-family:'IBM Plex Mono',monospace;
  font-size:.74rem;font-weight:500;letter-spacing:.22em;text-transform:uppercase;
  color:var(--ink-soft);display:inline-flex;align-items:center;gap:.7em;
}
.eyebrow .num{color:var(--accent)}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--line-strong)}

.mono{font-family:'IBM Plex Mono',monospace}

/* ---------- layout ---------- */
.wrap{max-width:var(--maxw);margin:0 auto;padding-left:var(--pad);padding-right:var(--pad)}
section{position:relative}
.section-pad{padding-block:clamp(72px,11vw,150px)}
.rule{height:3px;border:0;background:var(--grad);border-radius:3px}
.hair{height:1px;background:var(--line);border:0}

/* ---------- top bar ---------- */
.topbar{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--paper) 86%,transparent);
  backdrop-filter:blur(14px) saturate(1.2);border-bottom:1px solid var(--line)}
.topbar .grad-edge{height:3px;background:var(--grad);position:relative;overflow:hidden}
.topbar .grad-edge::after{content:"";position:absolute;inset:0;background:var(--paper);opacity:.72;clip-path:inset(0 0 0 calc(var(--scroll,0) * 100%))}
.nav{display:flex;align-items:center;justify-content:space-between;gap:24px;
  max-width:var(--maxw);margin:0 auto;padding:14px var(--pad)}
.brand{display:flex;align-items:center;gap:11px}
.brand img{height:34px;width:auto}
.brand .wm{font-family:'Space Grotesk',sans-serif;font-weight:700;font-size:1.32rem;letter-spacing:-.02em}
.brand .wm small{display:block;font-family:'IBM Plex Mono',monospace;font-weight:400;font-size:.52rem;
  letter-spacing:.34em;color:var(--ink-soft);margin-top:1px}
.navlinks{display:flex;align-items:center;gap:6px}
.navlinks a{font-size:.95rem;font-weight:500;padding:9px 14px;border-radius:9px;color:var(--ink-2);
  transition:background .2s var(--ease),color .2s var(--ease)}
.navlinks a:hover{background:var(--paper-soft);color:var(--ink)}
.navlinks a.active{color:var(--ink)}
.navlinks a.active::after{content:"";display:block;height:2px;margin-top:5px;background:var(--accent);border-radius:2px}
.nav-cta{display:inline-flex}
/* nav-link rule has higher specificity than .btn-primary — restore button text colour */
.navlinks .nav-cta a.btn-primary{color:#fff;font-weight:600}
.navlinks .nav-cta a.btn-primary:hover{color:#fff;background-image:var(--grad);background-size:185% 185%;background-position:94% 50%}
/* services dropdown */
.navlinks .has-sub{position:relative;display:inline-flex;align-items:center}
.navlinks .has-sub>a{display:inline-flex;align-items:center}
.submenu{position:absolute;top:100%;left:50%;transform:translateX(-50%) translateY(2px);min-width:212px;
  background:var(--paper);border:1px solid var(--line);border-radius:14px;box-shadow:0 26px 50px -28px rgba(0,0,0,.5);
  padding:8px;display:flex;flex-direction:column;gap:2px;opacity:0;visibility:hidden;pointer-events:none;
  transition:opacity .2s var(--ease),transform .2s var(--ease);z-index:60}
.navlinks .has-sub::after{content:"";position:absolute;top:100%;left:0;right:0;height:12px}
.navlinks .has-sub:hover .submenu,.navlinks .has-sub:focus-within .submenu{opacity:1;visibility:visible;pointer-events:auto;transform:translateX(-50%) translateY(8px)}
.submenu a{font-family:'IBM Plex Mono',monospace;font-size:.74rem!important;letter-spacing:.05em;color:var(--ink-2);
  padding:10px 12px!important;border-radius:9px;white-space:nowrap;display:flex!important;align-items:center;gap:9px}
.submenu a::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--line-strong);flex:none}
.submenu a:hover{background:var(--card);color:var(--ink)}
.submenu a:hover::before{background:var(--accent)}
.menu-btn{display:none;background:none;border:1px solid var(--line-strong);border-radius:9px;
  padding:9px 12px;font-family:'IBM Plex Mono',monospace;font-size:.8rem;cursor:pointer;color:var(--ink)}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:.6em;font-family:'IBM Plex Sans',sans-serif;
  font-weight:600;font-size:.98rem;padding:13px 22px;border-radius:11px;cursor:pointer;border:1px solid transparent;
  transition:transform .18s var(--ease),background .2s var(--ease),box-shadow .2s var(--ease);white-space:nowrap}
.btn .arr{transition:transform .25s var(--ease)}
.btn:hover .arr{transform:translateX(4px)}
.btn-primary{background:var(--grad);background-size:185% 185%;background-position:6% 50%;color:#fff;
  text-shadow:0 1px 2px rgba(0,0,0,.25);box-shadow:0 8px 22px -12px rgba(216,69,28,.55);
  transition:background-position .6s var(--ease),transform .18s var(--ease),box-shadow .25s var(--ease)}
.btn-primary:hover{background-position:94% 50%;transform:translateY(-1px);box-shadow:0 15px 32px -12px rgba(216,58,142,.5)}
.btn-primary:active{transform:translateY(0) scale(.99)}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--line-strong)}
.btn-ghost:hover{background:var(--grad);background-size:185% 185%;background-position:94% 50%;color:#fff;border-color:transparent;text-shadow:0 1px 2px rgba(0,0,0,.25);box-shadow:0 12px 28px -14px rgba(216,58,142,.5);transform:translateY(-1px)}
.btn-light{background:var(--paper);color:var(--ink)}
.btn-light:hover{background:#fff;transform:translateY(-1px)}

/* ---------- placeholder media ---------- */
.ph{position:relative;border-radius:var(--r);overflow:hidden;background:
  repeating-linear-gradient(135deg,#e7dfd1 0 12px,#e1d8c8 12px 24px);border:1px solid var(--line)}
.ph::after{content:attr(data-label);position:absolute;left:14px;bottom:12px;
  font-family:'IBM Plex Mono',monospace;font-size:.7rem;letter-spacing:.12em;text-transform:uppercase;
  color:var(--ink-soft);background:color-mix(in srgb,var(--card) 80%,transparent);
  padding:5px 9px;border-radius:7px;backdrop-filter:blur(3px)}
.ph .corner{position:absolute;top:12px;right:14px;font-family:'IBM Plex Mono',monospace;
  font-size:.66rem;letter-spacing:.1em;color:var(--ink-soft);opacity:.7}

/* ---------- cards / pillars ---------- */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:clamp(22px,3vw,34px);
  transition:transform .28s var(--ease),box-shadow .28s var(--ease),border-color .28s var(--ease)}
.card:hover{transform:translateY(-4px);box-shadow:0 22px 50px -34px rgba(26,24,21,.6);border-color:var(--line-strong)}
.idx{font-family:'IBM Plex Mono',monospace;font-size:.78rem;color:var(--accent);letter-spacing:.1em}

/* ---------- footer ---------- */
.footer{background:var(--ink);color:var(--paper)}
.footer .grad-edge{height:3px;background:var(--grad)}
.footer a{color:var(--paper)}
.footer .fmono{font-family:'IBM Plex Mono',monospace;font-size:.8rem;letter-spacing:.04em;color:#b7 afa0;color:#b6ada0}
.footer .fcol h4{color:#fff;font-size:.74rem;font-family:'IBM Plex Mono',monospace;font-weight:500;
  letter-spacing:.2em;text-transform:uppercase;margin-bottom:7px;color:#a89e90}
.footer .fcol a{display:block;padding:1px 0;color:#e9e2d6;font-size:.9rem;transition:color .2s}
.footer .fcol a:hover{color:#fff}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(38px) scale(.992);filter:blur(7px);will-change:opacity,transform,filter;transition:opacity .95s var(--ease),transform .95s var(--ease),filter .95s var(--ease)}
.reveal.in{opacity:1;transform:none;filter:blur(0)}

/* ---------- responsive ---------- */
@media(max-width:860px){
  .menu-btn{display:inline-block}
  .navlinks{position:fixed;inset:62px 0 auto 0;flex-direction:column;align-items:stretch;gap:2px;
    background:var(--paper);border-bottom:1px solid var(--line);padding:14px var(--pad) 22px;
    transform:translateY(-130%);transition:transform .34s var(--ease);box-shadow:0 24px 40px -30px rgba(0,0,0,.5)}
  .navlinks.open{transform:none}
  .navlinks a{padding:13px 6px;font-size:1.05rem;border-bottom:1px solid var(--line)}
  .navlinks a.active::after{display:none}
  .navlinks .has-sub{display:block;width:100%}
  .navlinks .has-sub>a{display:block}
  .navlinks .has-sub::after{display:none}
  .submenu{position:static;transform:none!important;opacity:1;visibility:visible;pointer-events:auto;
    box-shadow:none;border:0;background:transparent;padding:2px 0 6px 14px;min-width:0;gap:0}
  .submenu a{border-bottom:0!important;padding:11px 0!important;color:var(--ink-soft)}
  .nav-cta{margin-top:10px}
}

/* ---------- bridge motif (home statement) ---------- */
.bridge-wrap{margin-top:clamp(40px,6vw,82px)}
.bridge-art{width:100%;height:auto;display:block;overflow:visible}
.bridge-art .b-label{font-family:'IBM Plex Mono',monospace;font-size:21px;letter-spacing:.32em;fill:var(--ink-soft)}
.bridge-art .b-deck,.bridge-art .b-tower,.bridge-art .b-susp,.bridge-art .b-water,.bridge-art circle,.bridge-art .b-label{opacity:0;transition:opacity .9s var(--ease) .2s}
.bridge-art .b-cable{stroke-dasharray:1000;stroke-dashoffset:1000;transition:stroke-dashoffset 2s var(--ease) .3s}
.bridge-wrap.in .b-deck,.bridge-wrap.in .b-tower,.bridge-wrap.in .b-susp,.bridge-wrap.in .b-water,.bridge-wrap.in circle,.bridge-wrap.in .b-label{opacity:1}
.bridge-wrap.in .b-cable{stroke-dashoffset:0}
@media(prefers-reduced-motion:reduce){
  .reveal{opacity:1!important;transform:none!important;filter:none!important;transition:none}
  .hero-mark{transform:translateY(-50%)!important}
  .bridge-art .b-cable{transition:none;stroke-dashoffset:0}
  .bridge-art *{transition:none}
}

/* ---------- privacy modal (shared) ---------- */
.modal{position:fixed;inset:0;z-index:200;display:none;align-items:center;justify-content:center;padding:20px}
.modal.open{display:flex}
.modal .backdrop{position:absolute;inset:0;background:rgba(26,24,21,.55);backdrop-filter:blur(3px)}
.modal .panel{position:relative;background:var(--paper);border-radius:var(--r);width:min(880px,100%);height:min(86vh,940px);
  display:flex;flex-direction:column;overflow:hidden;box-shadow:0 30px 80px -30px rgba(0,0,0,.55);border:1px solid var(--line)}
.modal .panel-head{display:flex;align-items:center;justify-content:space-between;padding:15px 20px;border-bottom:1px solid var(--line);flex:0 0 auto}
.modal .panel-head .t{font-family:'IBM Plex Mono',monospace;font-size:.72rem;letter-spacing:.16em;text-transform:uppercase;color:var(--ink-soft)}
.modal .panel-head button{background:none;border:1px solid var(--line-strong);border-radius:8px;width:34px;height:34px;cursor:pointer;color:var(--ink);font-size:1rem;line-height:1;transition:background .2s ease,border-color .2s ease}
.modal .panel-head button:hover{background:var(--paper-soft);border-color:var(--ink-soft)}
.modal .panel iframe{flex:1 1 auto;width:100%;border:0;background:var(--paper)}

/* embed mode: privacy.html shown inside the modal — hide site chrome */
html.embed .topbar,html.embed .footer{display:none!important}
html.embed body{background:var(--paper)}
html.embed .page-hero{padding-top:clamp(22px,4vw,38px)}

/* ---------- back to top ---------- */
.to-top{position:fixed;right:clamp(16px,3vw,32px);bottom:clamp(16px,3vw,32px);z-index:90;
  width:48px;height:48px;border-radius:50%;border:1px solid var(--line-strong);
  background:var(--ink);color:var(--paper);cursor:pointer;display:flex;align-items:center;justify-content:center;
  font-size:1.2rem;line-height:1;box-shadow:0 14px 32px -14px rgba(0,0,0,.55);
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity .3s ease,transform .3s ease,visibility .3s ease,background .2s ease}
.to-top.show{opacity:1;visibility:visible;transform:none}
.to-top:hover{background:var(--accent)}
.to-top .tt-arr{transition:transform .2s ease}
.to-top:hover .tt-arr{transform:translateY(-2px)}
@media print{.to-top{display:none}}