/* ==========================================================================
   jzdesign.ai — Jichao Zhu
   ========================================================================== */

:root{
  --paper:#ffffff;
  --ink:#101010;
  --muted:#6b6b6b;
  --line:#e4e4e4;
  --dark:#0d0d0d;
  --dark-2:#161616;
  --tint:#f5f4f2;
  --gold:#c09b3f;

  --wrap:1560px;
  --pad:clamp(20px,5vw,84px);
  --gap:clamp(14px,2.4vw,32px);

  --f-sans:'Inter','Noto Sans SC',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,'PingFang SC','Microsoft YaHei',sans-serif;
  --ease:cubic-bezier(.22,.61,.36,1);
}

*,*::before,*::after{box-sizing:border-box}

html{ -webkit-text-size-adjust:100%; scroll-behavior:smooth; }
@media (prefers-reduced-motion:reduce){ html{scroll-behavior:auto} }

body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--f-sans);
  font-size:16px;
  line-height:1.62;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
body.is-locked{ overflow:hidden }

img,video{ display:block; max-width:100%; }
a{ color:inherit; text-decoration:none }
button{ font:inherit; color:inherit; background:none; border:0; cursor:pointer }
h1,h2,h3{ margin:0; font-weight:500; letter-spacing:-.02em; line-height:1.08 }
p{ margin:0 }
ul,dl,dd{ margin:0; padding:0; list-style:none }

.wrap{ max-width:var(--wrap); margin-inline:auto; padding-inline:var(--pad) }

.skip{
  position:absolute; left:-9999px; top:0; z-index:200;
  background:var(--ink); color:#fff; padding:12px 18px;
}
.skip:focus{ left:12px; top:12px }

:focus-visible{ outline:2px solid var(--gold); outline-offset:3px }

/* ------------------------------------------------------------------ type */
.eyebrow{
  font-size:11px; letter-spacing:.22em; text-transform:uppercase;
  color:var(--muted); font-weight:500;
  padding-bottom:18px; margin-bottom:34px;
  border-bottom:1px solid var(--line);
}
.band--dark .eyebrow{ color:#8d8d8d; border-color:#2a2a2a }

.band__title{ font-size:clamp(30px,4.6vw,62px); max-width:16ch; margin-bottom:22px }
.band__body{ font-size:clamp(16px,1.45vw,20px); color:var(--muted); max-width:62ch; line-height:1.66 }
.band--dark .band__body{ color:#a5a5a5 }

/* ---------------------------------------------------------------- header */
.hdr{
  position:fixed; inset:0 0 auto 0; z-index:100;
  display:flex; align-items:center; gap:24px;
  padding:0 var(--pad); height:74px;
  color:#fff;
  transition:background .4s var(--ease), color .4s var(--ease), height .4s var(--ease), border-color .4s var(--ease);
  border-bottom:1px solid transparent;
}
.hdr.is-solid{
  background:rgba(255,255,255,.92);
  backdrop-filter:saturate(1.6) blur(14px);
  -webkit-backdrop-filter:saturate(1.6) blur(14px);
  color:var(--ink); height:64px; border-bottom-color:var(--line);
}
.hdr__logo{ display:flex; align-items:baseline; gap:10px; flex:none }
.hdr__mark{ font-weight:600; letter-spacing:.06em; font-size:17px }
.hdr__wordmark{ font-size:12px; letter-spacing:.2em; text-transform:uppercase; opacity:.72 }

.hdr__nav{ display:flex; gap:clamp(16px,2.2vw,34px); margin-left:auto; font-size:13.5px; letter-spacing:.02em }
.hdr__nav a{ position:relative; padding:6px 0; opacity:.86; transition:opacity .25s }
.hdr__nav a::after{
  content:''; position:absolute; left:0; right:0; bottom:0; height:1px;
  background:currentColor; transform:scaleX(0); transform-origin:left;
  transition:transform .35s var(--ease);
}
.hdr__nav a:hover{ opacity:1 }
.hdr__nav a:hover::after,.hdr__nav a.is-active::after{ transform:scaleX(1) }
.hdr__nav a.is-active{ opacity:1 }

.hdr__right{ display:flex; align-items:center; gap:14px; margin-left:clamp(16px,2.4vw,34px) }
.lang{ display:flex; align-items:center; gap:2px; font-size:12px; letter-spacing:.08em }
.lang button{
  padding:5px 7px; opacity:.55; transition:opacity .25s; border-radius:2px;
}
.lang button:hover{ opacity:.9 }
.lang button.is-on{ opacity:1; font-weight:600; box-shadow:inset 0 -1px 0 currentColor }

.burger{ display:none; width:26px; height:26px; position:relative; flex:none }
.burger span{
  position:absolute; left:2px; right:2px; height:1.5px; background:currentColor;
  transition:transform .35s var(--ease), opacity .2s;
}
.burger span:first-child{ top:9px }
.burger span:last-child{ top:16px }
.burger[aria-expanded="true"] span:first-child{ transform:translateY(3.5px) rotate(45deg) }
.burger[aria-expanded="true"] span:last-child{ transform:translateY(-3.5px) rotate(-45deg) }

.drawer{
  position:fixed; inset:0; z-index:99; background:var(--paper); color:var(--ink);
  padding:96px var(--pad) 40px; overflow-y:auto;
  animation:fade .3s var(--ease);
}
.drawer[hidden]{ display:none }
.drawer nav{ display:flex; flex-direction:column }
.drawer a{
  padding:15px 0; font-size:26px; letter-spacing:-.01em;
  border-bottom:1px solid var(--line);
}
.drawer a.sub{ font-size:16px; padding-left:18px; color:var(--muted) }
@keyframes fade{ from{opacity:0} to{opacity:1} }

/* ------------------------------------------------------------------ hero */
.hero{ position:relative; height:100svh; min-height:520px; display:flex; align-items:flex-end; color:#fff; overflow:hidden }
.hero__media{ position:absolute; inset:0 }
.hero__media video{ width:100%; height:100%; object-fit:cover }
.hero__scrim{
  position:absolute; inset:0;
  background:
    linear-gradient(to top, rgba(0,0,0,.72) 0%, rgba(0,0,0,.22) 42%, rgba(0,0,0,.32) 100%);
}
.hero__body{ position:relative; padding:0 var(--pad) clamp(64px,11vh,132px); max-width:var(--wrap); margin-inline:auto; width:100% }
.hero__role{
  font-size:11px; letter-spacing:.24em; text-transform:uppercase;
  opacity:.82; margin-bottom:20px;
}
.hero__name{
  font-size:clamp(48px,10.5vw,168px); font-weight:500; letter-spacing:-.04em; line-height:.92;
  margin-bottom:26px;
}
.hero__claim{ font-size:clamp(16px,1.7vw,23px); max-width:44ch; line-height:1.5; opacity:.94 }

.hero__scroll{
  position:absolute; right:var(--pad); bottom:clamp(64px,11vh,132px);
  display:flex; align-items:center; gap:12px;
  font-size:10.5px; letter-spacing:.22em; text-transform:uppercase; opacity:.8;
}
.hero__scroll i{ display:block; width:46px; height:1px; background:currentColor; position:relative }
.hero__scroll i::after{
  content:''; position:absolute; right:0; top:-2.5px; width:6px; height:6px;
  border-right:1px solid currentColor; border-bottom:1px solid currentColor;
  transform:rotate(-45deg);
}
@media (max-width:900px){ .hero__scroll{ display:none } }

/* ----------------------------------------------------------------- intro */
.intro{ padding:clamp(64px,11vw,150px) 0 clamp(40px,6vw,80px) }
.intro__lead{ font-size:clamp(26px,3.6vw,50px); max-width:22ch; margin-bottom:30px }
.intro__body{ font-size:clamp(15.5px,1.35vw,19px); color:var(--muted); max-width:68ch; line-height:1.7 }

.stats{ display:grid; grid-template-columns:repeat(4,1fr); gap:var(--gap); margin-top:clamp(48px,6vw,86px); border-top:1px solid var(--line); padding-top:30px }
.stats li{ display:flex; flex-direction:column; gap:6px }
.stats b{ font-size:clamp(30px,3.4vw,46px); font-weight:400; letter-spacing:-.03em }
.stats span{ font-size:12.5px; color:var(--muted); line-height:1.4 }
@media (max-width:760px){ .stats{ grid-template-columns:repeat(2,1fr); row-gap:28px } }

/* ----------------------------------------------------------------- bands */
.band{ padding:clamp(56px,8vw,120px) 0 }
.band--dark{ background:var(--dark); color:#f2f2f2 }
.band--tint{ background:var(--tint) }

.sect{ padding-top:clamp(40px,5.5vw,84px) }
.sect__head{ display:grid; grid-template-columns:minmax(0,1fr) minmax(0,1.1fr); gap:var(--gap); align-items:end; margin-bottom:clamp(26px,3.4vw,52px) }
.sect__title{ font-size:clamp(28px,4vw,54px) }
.sect__body{ color:var(--muted); font-size:clamp(15px,1.25vw,17.5px); max-width:56ch }
@media (max-width:860px){ .sect__head{ grid-template-columns:1fr; gap:14px; align-items:start } }

/* ------------------------------------------------------------------ grid */
.grid{
  display:grid; grid-template-columns:repeat(2,minmax(0,1fr));
  gap:var(--gap); padding-inline:var(--pad);
  max-width:var(--wrap); margin-inline:auto;
}
@media (max-width:760px){ .grid{ grid-template-columns:1fr } }

.card{ grid-column:span 1; display:block; width:100%; text-align:left; position:relative }
.card--wide{ grid-column:1 / -1 }
@media (max-width:760px){ .card,.card--wide{ grid-column:1 / -1 } }

.card__frame{
  position:relative; overflow:hidden; background:#eceae7;
  aspect-ratio:4/3;
}
.card--wide .card__frame{ aspect-ratio:21/9 }
@media (max-width:760px){ .card--wide .card__frame{ aspect-ratio:16/10 } }

.card__frame img,.card__frame video{
  width:100%; height:100%; object-fit:cover;
  transition:transform 1.1s var(--ease), opacity .5s;
}
.card:hover .card__frame img,.card:hover .card__frame video{ transform:scale(1.045) }

.card__play{
  position:absolute; left:18px; bottom:18px; z-index:2;
  display:flex; align-items:center; gap:8px;
  background:rgba(15,15,15,.62); color:#fff;
  padding:7px 13px 7px 11px; border-radius:100px;
  font-size:10.5px; letter-spacing:.16em; text-transform:uppercase;
  backdrop-filter:blur(6px); -webkit-backdrop-filter:blur(6px);
}
.card__play svg{ width:9px; height:11px; fill:currentColor }

.card__foot{ display:flex; justify-content:space-between; align-items:baseline; gap:16px; padding-top:14px }
.card__name{ font-size:clamp(16px,1.5vw,21px); font-weight:500; letter-spacing:-.012em }
.card__tag{ font-size:11px; letter-spacing:.16em; text-transform:uppercase; color:var(--muted); text-align:right; flex:none }
.card__arrow{
  display:inline-block; margin-left:10px; opacity:0; transform:translateX(-6px);
  transition:opacity .35s var(--ease), transform .35s var(--ease);
}
.card:hover .card__arrow{ opacity:1; transform:translateX(0) }

/* --------------------------------------------------------------- service */
.svc{ display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:clamp(30px,4.5vw,74px); margin-top:clamp(34px,4.5vw,64px) }
@media (max-width:860px){ .svc{ grid-template-columns:1fr } }
.svc__fig{ margin:0 0 26px }
.svc__fig img{ width:100%; aspect-ratio:3/2; object-fit:cover; filter:grayscale(.15) }
.svc__col h3{ font-size:clamp(22px,2.4vw,32px); margin-bottom:16px }
.svc__col > p{ color:#a5a5a5; font-size:15.5px; line-height:1.68; max-width:52ch }
.band:not(.band--dark) .svc__col > p{ color:var(--muted) }

.ticks{ margin-top:26px; border-top:1px solid #2a2a2a }
.band:not(.band--dark) .ticks{ border-color:var(--line) }
.ticks li{
  padding:13px 0 13px 26px; border-bottom:1px solid #2a2a2a;
  font-size:14.5px; position:relative; line-height:1.5;
}
.band:not(.band--dark) .ticks li{ border-color:var(--line) }
.ticks li::before{
  content:''; position:absolute; left:2px; top:21px;
  width:9px; height:5px; border-left:1px solid var(--gold); border-bottom:1px solid var(--gold);
  transform:rotate(-45deg);
}
.svc__fmt{ margin-top:22px; font-size:12.5px; letter-spacing:.05em; color:#8d8d8d }

.svc__shots{ display:grid; grid-template-columns:repeat(3,1fr); gap:10px; margin-top:26px }
.svc__shots img{ width:100%; aspect-ratio:1; object-fit:cover; filter:grayscale(.2) }

/* ----------------------------------------------------------------- about */
.about{ display:grid; grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr); gap:clamp(28px,4.5vw,74px); align-items:start }
@media (max-width:860px){ .about{ grid-template-columns:1fr } }
.about__fig{ margin:0 }
.about__fig img{ width:100%; aspect-ratio:3/4; object-fit:cover }
@media (max-width:860px){ .about__fig img{ aspect-ratio:4/3 } }
.about__txt p{ font-size:clamp(15.5px,1.3vw,18.5px); color:#3a3a3a; line-height:1.72; margin-bottom:20px; max-width:62ch }
.about__ch{ font-size:11px; letter-spacing:.22em; text-transform:uppercase; color:var(--muted); margin:38px 0 4px }
.credits li{ display:grid; grid-template-columns:66px 1fr; gap:14px; padding:13px 0; border-bottom:1px solid var(--line); font-size:14.5px }
.credits b{ color:var(--muted); font-weight:400; font-variant-numeric:tabular-nums }

.about__strip{ display:grid; grid-template-columns:repeat(4,1fr); gap:var(--gap); margin-top:clamp(40px,5vw,80px) }
.about__strip img{ width:100%; aspect-ratio:4/3; object-fit:cover }
@media (max-width:760px){ .about__strip{ grid-template-columns:repeat(2,1fr) } }

/* -------------------------------------------------------------- thinking */
.think{ display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:clamp(26px,3.4vw,52px); margin-top:clamp(34px,4.5vw,64px) }
@media (max-width:760px){ .think{ grid-template-columns:1fr } }
.think article{ display:flex; flex-direction:column }
.think img{ width:100%; aspect-ratio:16/10; object-fit:cover; margin-bottom:20px }
.think .meta{ font-size:10.5px; letter-spacing:.2em; text-transform:uppercase; color:var(--muted); margin-bottom:10px }
.think h3{ font-size:clamp(19px,1.9vw,26px); margin-bottom:12px; max-width:24ch }
.think p{ color:var(--muted); font-size:15px; line-height:1.66; max-width:52ch }

/* --------------------------------------------------------------- contact */
.contact__title{ font-size:clamp(32px,5.4vw,78px); max-width:14ch; margin-bottom:24px }
.contact__list{ display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); gap:var(--gap); margin:clamp(40px,5vw,74px) 0 40px; border-top:1px solid #2a2a2a; padding-top:28px }
@media (max-width:760px){ .contact__list{ grid-template-columns:1fr; row-gap:26px } }
.contact__list dt{ font-size:10.5px; letter-spacing:.2em; text-transform:uppercase; color:#8d8d8d; margin-bottom:9px }
.contact__list dd{ font-size:clamp(15px,1.3vw,18px) }
.contact__list a{ box-shadow:inset 0 -1px 0 rgba(255,255,255,.35); transition:box-shadow .3s }
.contact__list a:hover{ box-shadow:inset 0 -1px 0 var(--gold); color:var(--gold) }
.contact__vdid{ height:56px; width:56px; background:#fff; padding:6px; border-radius:2px }

.btn{
  display:inline-flex; align-items:center; gap:12px;
  border:1px solid #3a3a3a; padding:15px 30px; border-radius:100px;
  font-size:13px; letter-spacing:.1em; text-transform:uppercase;
  transition:background .35s var(--ease), color .35s var(--ease), border-color .35s var(--ease);
}
.btn::after{ content:'→'; transition:transform .35s var(--ease) }
.btn:hover{ background:#fff; color:var(--dark); border-color:#fff }
.btn:hover::after{ transform:translateX(4px) }

/* ---------------------------------------------------------------- footer */
.ftr{ background:var(--dark); color:#6f6f6f; padding:34px 0; border-top:1px solid #222 }
.ftr__in{ display:flex; justify-content:space-between; gap:20px; flex-wrap:wrap; font-size:12.5px }
.ftr a:hover{ color:#e8e8e8 }

/* ----------------------------------------------------------------- modal */
.modal{
  position:fixed; inset:0; z-index:120; background:var(--paper);
  display:flex; flex-direction:column;
  animation:mIn .4s var(--ease);
}
.modal[hidden]{ display:none }
@keyframes mIn{ from{opacity:0; transform:translateY(14px)} to{opacity:1; transform:none} }

.modal__bar{
  flex:none; display:flex; align-items:center; gap:20px;
  padding:16px var(--pad); border-bottom:1px solid var(--line);
  background:rgba(255,255,255,.94); backdrop-filter:blur(12px); -webkit-backdrop-filter:blur(12px);
}
.modal__id{ min-width:0 }
.modal__id h2{ font-size:clamp(17px,2vw,25px); white-space:nowrap; overflow:hidden; text-overflow:ellipsis }
.modal__id p{ font-size:10.5px; letter-spacing:.2em; text-transform:uppercase; color:var(--muted); margin-top:5px }
.modal__x{ margin-left:auto; flex:none; width:42px; height:42px; border:1px solid var(--line); border-radius:50%; display:grid; place-items:center; transition:background .3s,border-color .3s }
.modal__x:hover{ background:var(--ink); border-color:var(--ink); color:#fff }
.modal__x svg{ width:15px; height:15px; stroke:currentColor; stroke-width:1.4; fill:none }

.modal__scroll{ flex:1; overflow-y:auto; overscroll-behavior:contain; -webkit-overflow-scrolling:touch; padding-bottom:80px }
.modal__intro{ display:grid; grid-template-columns:minmax(0,1.35fr) minmax(0,.8fr); gap:clamp(26px,4vw,70px); padding-top:clamp(34px,5vw,72px); padding-bottom:clamp(34px,5vw,64px) }
@media (max-width:860px){ .modal__intro{ grid-template-columns:1fr; gap:28px } }
.modal__desc{ font-size:clamp(16px,1.5vw,21px); line-height:1.68; color:#2c2c2c }
.modal__meta > div{ padding:13px 0; border-bottom:1px solid var(--line) }
.modal__meta > div:first-child{ border-top:1px solid var(--line) }
.modal__meta dt{ font-size:10.5px; letter-spacing:.2em; text-transform:uppercase; color:var(--muted); margin-bottom:6px }
.modal__meta dd{ font-size:14.5px; line-height:1.5 }

.modal__media{
  display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:var(--gap);
  padding-inline:var(--pad); max-width:var(--wrap); margin-inline:auto;
}
@media (max-width:760px){ .modal__media{ grid-template-columns:1fr } }
.modal__media figure{ margin:0; background:#eceae7; overflow:hidden }
.modal__media figure.full{ grid-column:1 / -1 }
.modal__media img,.modal__media video{ width:100%; height:auto; display:block }
.modal__media video{ background:#0d0d0d }

.modal__next{
  display:block; width:calc(100% - var(--pad)*2); max-width:var(--wrap);
  margin:clamp(40px,5vw,80px) auto 0;
  border-top:1px solid var(--line); padding:26px 0 0;
  text-align:left; font-size:clamp(20px,3vw,38px); letter-spacing:-.02em;
  transition:opacity .3s;
}
.modal__next small{ display:block; font-size:10.5px; letter-spacing:.2em; text-transform:uppercase; color:var(--muted); margin-bottom:10px; font-weight:500 }
.modal__next:hover{ opacity:.6 }


/* anchor offset so fixed header never covers a section heading */
section[id],.sect[id]{ scroll-margin-top:78px }
.hero[id],#top{ scroll-margin-top:0 }

/* very small screens: uppercase tracking must not overflow */
@media (max-width:400px){
  .hero__role{ letter-spacing:.16em; font-size:10px }
  .eyebrow{ letter-spacing:.16em }
  .card__tag,.think .meta,.contact__list dt,.modal__id p{ letter-spacing:.14em }
}

/* ------------------------------------------------------------- reveal fx */
.rv{ opacity:0; transform:translateY(22px); transition:opacity .9s var(--ease), transform .9s var(--ease) }
.rv.in{ opacity:1; transform:none }
@media (prefers-reduced-motion:reduce){ .rv{ opacity:1; transform:none; transition:none } }

/* ------------------------------------------------------------ responsive */
@media (max-width:1080px){
  .hdr__nav{ display:none }
  .burger{ display:block }
}
@media (max-width:520px){
  .hdr__wordmark{ display:none }
  .card__foot{ flex-direction:column; gap:5px }
  .card__tag{ text-align:left }
}

/* Chinese typography — slightly looser, no negative tracking */
html[lang="zh"] body{ letter-spacing:.01em }
html[lang="zh"] h1,html[lang="zh"] h2,html[lang="zh"] h3{ letter-spacing:0 }
html[lang="zh"] .hero__name{ letter-spacing:-.02em }