/* ==========================================================================
   长乐坊 · 共享站点样式 /assets/site.css
   ========================================================================== */

:root{
  --ink-deep:#0A0C12;
  --ink-night:#0E1730;
  --gold:#E3A93C;
  --cinnabar:#D4552E;
  --celadon:#3FA07F;
  --violet:#7A6BD6;
  --paper:#F3EFE6;
  --paper-dim:#C9D2E2;
  --slate:#9AA6BA;
  --line:#3A4459;

  --gold-soft:rgba(227,169,60,.14);
  --celadon-soft:rgba(63,160,127,.16);
  --cinnabar-soft:rgba(212,85,46,.16);
  --violet-soft:rgba(122,107,214,.16);

  --font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono","SFMono-Regular",Consolas,"Liberation Mono","Courier New",monospace;

  --fs-h1:clamp(2.2rem,6vw,5.2rem);
  --fs-h2:clamp(1.4rem,2.6vw,2rem);
  --fs-note:.85rem;
  --rail:1240px;
  --radius-pill:999px;
  --radius-card:14px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  min-height:100vh;
  background-color:var(--ink-night);
  background-image:
    radial-gradient(circle at 10% -6%, rgba(227,169,60,.09), transparent 46%),
    radial-gradient(circle at 92% 3%, rgba(122,107,214,.11), transparent 42%),
    linear-gradient(to right, rgba(58,68,89,.20) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(58,68,89,.20) 1px, transparent 1px);
  background-size:auto,auto,120px 120px,120px 120px;
  background-repeat:no-repeat,no-repeat,repeat,repeat;
  color:var(--paper);
  font-family:var(--font-sans);
  font-size:var(--fs-body);
  line-height:1.9;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,h5,p,figure,blockquote,ul,ol{margin:0}
ul,ol{padding:0;list-style:none}
h1,h2,h3,h4,h5{line-height:1.2;font-weight:800;letter-spacing:-.01em}
img,svg,video{max-width:100%;height:auto}
button{font:inherit;color:inherit;background:none;border:0}
a{color:inherit}
address{font-style:normal}

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

/* ---------- skip link ---------- */
.skip-link{
  position:fixed;top:14px;left:14px;z-index:200;
  display:inline-flex;align-items:center;
  padding:.62rem 1.1rem;
  background:var(--gold);color:var(--ink-deep);
  font-family:var(--font-mono);font-size:.76rem;letter-spacing:.1em;
  border-radius:var(--radius-pill);text-decoration:none;
  transform:translateY(-180%);
  transition:transform .2s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:90;
  padding:clamp(9px,1.3vw,14px) clamp(12px,3vw,28px) clamp(7px,1vw,11px);
  background:linear-gradient(180deg, rgba(10,12,18,.92), rgba(14,23,48,.66));
  border-bottom:1px solid rgba(58,68,89,.45);
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  backdrop-filter:blur(14px) saturate(140%);
  transition:padding .28s var(--ease), background .28s var(--ease), border-color .28s var(--ease);
}
.site-header[data-scrolled]{
  padding-top:6px;padding-bottom:5px;
  background:linear-gradient(180deg, rgba(10,12,18,.97), rgba(14,23,48,.88));
  border-bottom-color:rgba(58,68,89,.75);
}
.site-header[data-scrolled] .brand-island{padding-top:5px;padding-bottom:6px}
.site-header[data-scrolled] .nav-link{padding-top:6px;padding-bottom:6px}

.header-rail{
  position:relative;
  max-width:var(--rail);
  margin:0 auto;
  display:flex;
  align-items:center;
  gap:clamp(8px,1.6vw,18px);
}

.brand-island{
  flex:0 0 auto;
  display:inline-flex;flex-direction:column;justify-content:center;
  padding:7px 18px 8px;
  border:1px solid var(--line);
  border-radius:var(--radius-pill);
  background:rgba(10,12,18,.88);
  text-decoration:none;
  box-shadow:0 6px 22px rgba(0,0,0,.36);
  transition:border-color .25s var(--ease), padding .28s var(--ease);
}
.brand-island:hover{border-color:rgba(227,169,60,.55)}
.brand-mark{
  font-size:1.02rem;font-weight:800;letter-spacing:.16em;line-height:1.25;
  color:var(--paper);
}
.brand-subline{
  font-family:var(--font-mono);font-size:.6rem;letter-spacing:.14em;line-height:1.35;
  color:var(--slate);
}

.nav-island{
  flex:0 1 auto;
  margin-inline:auto;
  padding:5px;
  border:1px solid var(--line);
  border-radius:var(--radius-pill);
  background:rgba(10,12,18,.88);
  box-shadow:0 6px 22px rgba(0,0,0,.36);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-item{display:flex}
.nav-link{
  display:block;
  padding:7px 14px;
  border:1px solid transparent;
  border-radius:var(--radius-pill);
  font-size:.84rem;line-height:1.4;
  color:var(--paper-dim);
  text-decoration:none;white-space:nowrap;
  transition:color .2s var(--ease), background .2s var(--ease), border-color .2s var(--ease), padding .28s var(--ease);
}
.nav-link:hover{color:var(--paper);background:rgba(243,239,230,.06)}
.nav-link[aria-current="page"]{
  color:var(--gold);
  border-color:rgba(227,169,60,.55);
  background:var(--gold-soft);
}

.utility-island{
  flex:0 0 auto;
  display:flex;flex-direction:column;align-items:flex-end;gap:1px;
  font-family:var(--font-mono);font-size:.62rem;letter-spacing:.09em;line-height:1.5;
  color:var(--slate);text-align:right;
}
.utility-code{color:var(--gold)}
.utility-state{display:inline-flex;align-items:center;gap:6px}
.utility-state::before{
  content:"";width:6px;height:6px;border-radius:50%;
  background:var(--celadon);
  box-shadow:0 0 0 3px var(--celadon-soft);
}

.nav-toggle{
  display:none;
  flex:0 0 auto;
  margin-left:auto;
  align-items:center;gap:9px;
  padding:9px 15px;
  border:1px solid var(--line);
  border-radius:var(--radius-pill);
  background:rgba(10,12,18,.88);
  color:var(--paper);
  cursor:pointer;
  transition:border-color .2s var(--ease), color .2s var(--ease);
}
.nav-toggle:hover{border-color:rgba(227,169,60,.55);color:var(--gold)}
.nav-toggle-label{font-family:var(--font-mono);font-size:.68rem;letter-spacing:.16em}
.nav-toggle-bars{position:relative;display:block;width:16px;height:10px}
.nav-toggle-bars::before,
.nav-toggle-bars::after{
  content:"";position:absolute;left:0;width:100%;height:1.5px;
  background:currentColor;
  transition:transform .22s var(--ease);
}
.nav-toggle-bars::before{top:0}
.nav-toggle-bars::after{bottom:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before{transform:translateY(4px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after{transform:translateY(-4px) rotate(-45deg)}

.scroll-progress{
  position:absolute;left:0;bottom:-1px;
  width:100%;height:2px;
  transform:scaleX(var(--progress,0));
  transform-origin:left center;
  background:linear-gradient(90deg,var(--gold),var(--cinnabar) 55%,var(--violet));
  opacity:.85;
  transition:transform .12s linear;
}

/* ---------- footer ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(48px,7vw,110px);
  background:linear-gradient(180deg, rgba(10,12,18,.88), var(--ink-deep) 44%);
  border-top:1px solid var(--line);
}
.footer-inner{
  max-width:var(--rail);
  margin:0 auto;
  padding:clamp(34px,4.6vw,64px) clamp(18px,4vw,28px) clamp(20px,3vw,32px);
}
.footer-grid{
  display:grid;
  grid-template-columns:minmax(200px,1.5fr) minmax(110px,.75fr) minmax(110px,.75fr) minmax(240px,1.4fr);
  gap:clamp(22px,3.4vw,46px);
  padding-bottom:clamp(24px,3vw,40px);
  border-bottom:1px solid rgba(58,68,89,.6);
}
.footer-brand{min-width:0}
.footer-brand-name{
  font-size:1.5rem;font-weight:800;letter-spacing:.22em;line-height:1.3;
  color:var(--paper);
}
.footer-brand-note{
  margin-top:.45rem;
  font-family:var(--font-mono);font-size:.66rem;letter-spacing:.12em;
  color:var(--gold);
}
.footer-status{
  margin-top:.9rem;max-width:24rem;
  font-size:.8rem;line-height:1.85;color:var(--slate);
}
.footer-col{min-width:0}
.footer-col-title{
  margin-bottom:.95rem;
  font-family:var(--font-mono);font-size:.68rem;font-weight:500;letter-spacing:.18em;
  color:var(--slate);
}
.footer-col-title::before{content:"[ ";color:var(--line)}
.footer-col-title::after{content:" ]";color:var(--line)}
.footer-list{display:flex;flex-direction:column;gap:.55rem}
.footer-link{
  display:inline-block;
  font-size:.88rem;color:var(--paper-dim);text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease), border-color .2s var(--ease);
}
.footer-link:hover{color:var(--gold);border-bottom-color:rgba(227,169,60,.55)}

.footer-contact{min-width:0}
.footer-contact-list{display:flex;flex-direction:column;gap:.62rem}
.footer-contact-row{display:flex;gap:.7rem;align-items:baseline;font-size:.85rem}
.footer-contact-key{
  flex:0 0 auto;min-width:2.6rem;
  font-family:var(--font-mono);font-size:.64rem;letter-spacing:.12em;
  color:var(--slate);
}
.footer-contact-value{color:var(--paper-dim);overflow-wrap:anywhere}
.footer-note{margin-top:.9rem;font-size:.78rem;line-height:1.85;color:var(--slate)}

.footer-base{
  display:flex;flex-wrap:wrap;align-items:center;gap:.6rem 1.6rem;
  padding-top:clamp(18px,2.4vw,26px);
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.08em;
  color:var(--slate);
}
.footer-legal{color:var(--paper-dim)}
.footer-archival{flex:1 1 20rem}
.footer-copy{color:var(--slate)}

/* ---------- layout helpers ---------- */
.wrap{width:100%;max-width:var(--rail);margin-inline:auto;padding-inline:clamp(18px,4vw,28px)}
.section{padding-block:clamp(40px,6vw,88px)}
.section--tight{padding-block:clamp(24px,3.4vw,48px)}
.rule{border:0;border-top:1px solid var(--line);margin:0}

.breadcrumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:.5rem;
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.09em;
  color:var(--slate);
}
.breadcrumbs li{display:inline-flex;align-items:center;gap:.5rem}
.breadcrumbs li + li::before{content:"/";color:var(--line)}
.breadcrumbs a{color:var(--paper-dim);text-decoration:none}
.breadcrumbs a:hover{color:var(--gold)}
.breadcrumbs [aria-current="page"]{color:var(--gold)}

/* ---------- type & index ---------- */
.mono-label{
  display:inline-flex;align-items:center;
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.18em;
  color:var(--gold);
}
.mono-label::before{content:"[";margin-right:.3em;color:var(--line)}
.mono-label::after{content:"]";margin-left:.3em;color:var(--line)}

.section-title{font-size:var(--fs-h2);font-weight:800;color:var(--paper)}

.data-figure{
  display:block;
  font-family:var(--font-mono);font-weight:600;
  font-size:clamp(2.2rem,5vw,3.6rem);letter-spacing:.02em;line-height:1;
  color:var(--gold);
}

.prose{max-width:72ch;line-height:1.92;color:var(--paper-dim)}
.prose > * + *{margin-top:1.15em}
.prose h2,.prose h3{color:var(--paper)}
.prose ul,.prose ol{padding-left:1.35em;list-style:disc}

/* ---------- controls ---------- */
.btn{
  display:inline-flex;align-items:center;gap:.55rem;
  padding:.78rem 1.45rem;
  border:1px solid var(--line);
  border-radius:var(--radius-pill);
  color:var(--paper);text-decoration:none;cursor:pointer;
  font-size:.88rem;font-weight:600;letter-spacing:.04em;
  transition:border-color .22s var(--ease), color .22s var(--ease), background .22s var(--ease), transform .22s var(--ease);
}
.btn:hover{border-color:rgba(227,169,60,.7);color:var(--gold);transform:translateY(-1px)}
.btn--solid{background:var(--gold);border-color:var(--gold);color:var(--ink-deep)}
.btn--solid:hover{background:#F0BB55;border-color:#F0BB55;color:var(--ink-deep)}
.btn--ghost{color:var(--paper-dim)}

.tag{
  display:inline-flex;align-items:center;gap:.4rem;
  padding:.26rem .7rem;
  border:1px solid var(--line);border-radius:var(--radius-pill);
  font-family:var(--font-mono);font-size:.66rem;letter-spacing:.1em;
  color:var(--slate);
}
.tag--gold{color:var(--gold);border-color:rgba(227,169,60,.5);background:var(--gold-soft)}
.tag--celadon{color:var(--celadon);border-color:rgba(63,160,127,.5);background:var(--celadon-soft)}
.tag--cinnabar{color:#E9764F;border-color:rgba(212,85,46,.5);background:var(--cinnabar-soft)}
.tag--violet{color:#9E92E8;border-color:rgba(122,107,214,.5);background:var(--violet-soft)}

.panel{
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  background:rgba(10,12,18,.55);
  padding:clamp(18px,2.4vw,28px);
}
.panel--raised{box-shadow:0 18px 44px rgba(0,0,0,.34)}

/* ---------- media frames ---------- */
.media-frame{
  position:relative;display:block;overflow:hidden;
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  background:linear-gradient(150deg, rgba(58,68,89,.42), rgba(10,12,18,.74));
}
.media-frame img{
  display:block;width:100%;height:100%;
  object-fit:cover;
  filter:saturate(.8) contrast(1.06) brightness(.94);
}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:radial-gradient(rgba(243,239,230,.14) .5px, transparent .5px);
  background-size:3px 3px;
  opacity:.32;
  mix-blend-mode:overlay;
}
.media-frame--1x1{aspect-ratio:1/1}
.media-frame--4x3{aspect-ratio:4/3}
.media-frame--16x9{aspect-ratio:16/9}
.media-frame--21x9{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:3/4}

.media-placeholder{
  display:grid;place-items:center;
  min-height:180px;
  border:1px dashed var(--line);
  border-radius:var(--radius-card);
  background:repeating-linear-gradient(135deg, rgba(58,68,89,.22) 0 10px, transparent 10px 20px);
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.12em;
  color:var(--slate);
}

/* ---------- reveal ---------- */
.reveal{
  opacity:0;transform:translateY(16px);
  transition:opacity .38s var(--ease), transform .38s var(--ease);
}
.reveal[data-visible]{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media (max-width:1040px){
  .utility-island{display:none}
  .nav-toggle{display:inline-flex}
  .nav-island{
    position:absolute;
    top:calc(100% + 10px);
    left:0;right:0;
    margin-inline:0;
    padding:8px;
    border-radius:20px;
    opacity:0;visibility:hidden;
    transform:translateY(-8px);
    transition:opacity .22s var(--ease), transform .22s var(--ease), visibility .22s;
  }
  .nav-island[data-open]{opacity:1;visibility:visible;transform:translateY(0)}
  .nav-list{flex-direction:column;align-items:stretch;gap:2px}
  .nav-item{display:block}
  .nav-link{padding:11px 14px;border-radius:14px;font-size:.95rem}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-brand{grid-column:1 / -1}
  .footer-contact{grid-column:1 / -1}
}

@media (max-width:600px){
  body{line-height:1.85}
  .footer-grid{grid-template-columns:1fr;gap:26px;padding-bottom:26px}
  .footer-brand,.footer-contact{grid-column:auto}
  .footer-base{flex-direction:column;align-items:flex-start;gap:.45rem}
  .footer-archival{flex:0 1 auto}
}

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