*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:auto}
body{margin:0}
img,picture,video,canvas,svg{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit;background:none;border:none;padding:0;-webkit-appearance:none;appearance:none}
button{cursor:pointer}
ul,ol{list-style:none;margin:0;padding:0}
h1,h2,h3,h4,h5,h6,p,figure,blockquote{margin:0}
a{color:inherit}

:root{
  --c7-red:#7C2E3E;
  --c7-yellow:#F2B705;
  --c7-blue:#00D4FF;
  --c7-purple:#9B59B6;
  --c7-ink:#2D2D2D;
  --c7-gray:#6D6D6D;
  --c7-paper:#FDF8F0;
  --c7-dark:#121212;
  --c7-serif:"Source Han Serif SC","Noto Serif SC","Songti SC","SimSun",serif;
  --c7-sans:"Source Han Sans SC","Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --c7-mono:"SFMono-Regular","Consolas","Liberation Mono",monospace;
  --c7-radius:28px;
  --c7-radius-md:16px;
  --c7-radius-sm:8px;
  --c7-capsule:999px;
  --c7-gutter:24px;
  --c7-content:1200px;
  --c7-ease:cubic-bezier(.22,.61,.36,1)
}

body{
  font-family:var(--c7-sans);
  font-size:16px;
  line-height:1.7;
  color:var(--c7-ink);
  background-color:var(--c7-paper);
  background-image:
    linear-gradient(rgba(18,18,18,.025) 1px,transparent 1px),
    linear-gradient(90deg,rgba(18,18,18,.025) 1px,transparent 1px);
  background-size:32px 32px
}

#main-content{scroll-margin-top:130px}

:focus-visible{outline:2px solid var(--c7-blue);outline-offset:3px;border-radius:4px}

.skip-link{
  position:fixed;top:12px;left:12px;z-index:300;
  padding:12px 22px;
  background:var(--c7-dark);color:#fff;
  border:1px solid var(--c7-blue);
  border-radius:var(--c7-capsule);
  font-size:14px;letter-spacing:.08em;text-decoration:none;
  transform:translateY(-180%);
  transition:transform .25s var(--c7-ease)
}
.skip-link:focus{transform:translateY(0)}

.c7-header{
  position:sticky;top:0;z-index:200;
  background-color:var(--c7-dark);
  background-image:
    linear-gradient(rgba(0,212,255,.05) 1px,transparent 1px),
    linear-gradient(90deg,rgba(0,212,255,.05) 1px,transparent 1px);
  background-size:32px 32px;
  color:#fff;
  transition:box-shadow .3s var(--c7-ease)
}
.c7-header::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:3px;
  background:linear-gradient(90deg,var(--c7-red) 0%,var(--c7-yellow) 35%,var(--c7-blue) 70%,var(--c7-purple) 100%)
}
.c7-header[data-scrolled]{box-shadow:0 10px 34px rgba(0,0,0,.32)}

.c7-header__inner{max-width:var(--c7-content);margin:0 auto;padding:14px var(--c7-gutter)}
.c7-masthead{display:flex;align-items:center;justify-content:space-between;gap:20px}

.c7-brand{display:inline-flex;align-items:center;gap:14px;text-decoration:none;color:#fff}
.c7-brand__glyph{
  display:inline-block;
  font-family:var(--c7-serif);font-weight:900;font-size:46px;line-height:.9;letter-spacing:-.04em;
  background:linear-gradient(135deg,var(--c7-yellow) 0%,var(--c7-yellow) 42%,var(--c7-blue) 92%);
  -webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent;color:var(--c7-yellow);
  filter:drop-shadow(3px 3px 0 rgba(124,46,62,.95))
}
.c7-brand__title{display:block;min-width:0}
.c7-brand__text{
  display:block;
  font-family:var(--c7-serif);font-weight:700;font-size:24px;letter-spacing:.08em;line-height:1.15
}
.c7-brand__sub{
  display:block;
  font-family:var(--c7-sans);font-weight:300;font-size:12px;letter-spacing:.2em;
  color:rgba(255,255,255,.6);margin-top:4px
}

.c7-masthead__side{
  display:flex;flex-direction:column;align-items:flex-end;gap:6px;
  font-family:var(--c7-mono);font-size:11px;letter-spacing:.16em;
  color:rgba(255,255,255,.55);white-space:nowrap
}
.c7-masthead__coords{color:rgba(0,212,255,.72)}

.c7-status{
  display:inline-flex;align-items:center;gap:7px;
  font-family:var(--c7-mono);font-size:11px;letter-spacing:.18em;color:rgba(255,255,255,.75)
}
.c7-status__dot{
  width:8px;height:8px;border-radius:50%;
  background:var(--c7-blue);box-shadow:0 0 10px var(--c7-blue);
  animation:c7-pulse 2.4s ease-in-out infinite
}
@keyframes c7-pulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.5;transform:scale(.78)}}

.c7-nav-toggle{
  display:none;
  align-items:center;gap:10px;
  padding:10px 16px;border-radius:var(--c7-capsule);
  border:1px solid rgba(255,255,255,.25);
  background:rgba(255,255,255,.06);color:#fff
}
.c7-nav-toggle__label{font-size:13px;letter-spacing:.18em}
.c7-nav-toggle__icon{display:inline-flex;flex-direction:column;gap:4px}
.c7-nav-toggle__line{display:block;width:18px;height:2px;background:currentColor;border-radius:2px;transition:transform .3s var(--c7-ease),opacity .2s}
.c7-nav-toggle[aria-expanded="true"] .c7-nav-toggle__line:nth-child(1){transform:translateY(6px) rotate(45deg)}
.c7-nav-toggle[aria-expanded="true"] .c7-nav-toggle__line:nth-child(2){opacity:0}
.c7-nav-toggle[aria-expanded="true"] .c7-nav-toggle__line:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

.c7-nav{border-top:1px solid rgba(255,255,255,.12)}
.c7-nav__inner{
  max-width:var(--c7-content);margin:0 auto;padding:0 var(--c7-gutter);
  display:flex;align-items:center;justify-content:space-between;gap:20px
}
.c7-nav__list{display:flex;flex:1;gap:2px}
.c7-nav__item{flex:1}
.c7-nav__link{
  display:flex;align-items:center;justify-content:center;gap:7px;
  padding:13px 8px 11px;text-decoration:none;
  color:rgba(255,255,255,.82);border-bottom:2px solid transparent;
  transition:color .2s,border-color .2s,background-color .2s
}
.c7-nav__link:hover{color:var(--c7-yellow);border-bottom-color:var(--c7-blue);background:rgba(255,255,255,.04)}
.c7-nav__link[aria-current="page"]{color:#fff;border-bottom-color:var(--c7-yellow)}
.c7-nav__link[aria-current="page"] .c7-nav__num{
  background:var(--c7-yellow);color:var(--c7-dark);
  padding:1px 6px;border-radius:var(--c7-capsule)
}
.c7-nav__num{font-family:var(--c7-mono);font-size:10px;color:rgba(0,212,255,.9);letter-spacing:.06em;transition:color .2s}
.c7-nav__name{font-size:15px;letter-spacing:.06em}
.c7-nav__index{font-family:var(--c7-mono);font-size:11px;color:rgba(255,255,255,.38);letter-spacing:.16em;white-space:nowrap}

.c7-footer{
  position:relative;
  margin-top:100px;
  background-color:var(--c7-dark);
  background-image:
    linear-gradient(rgba(0,212,255,.045) 1px,transparent 1px),
    linear-gradient(90deg,rgba(0,212,255,.045) 1px,transparent 1px);
  background-size:32px 32px;
  color:rgba(255,255,255,.75)
}
.c7-footer::before{
  content:"";display:block;height:4px;
  background:linear-gradient(90deg,var(--c7-red) 0%,var(--c7-yellow) 30%,var(--c7-blue) 70%,var(--c7-purple) 100%)
}
.c7-footer::after{
  content:"C7";
  position:absolute;right:3%;bottom:18%;z-index:0;
  font-family:var(--c7-serif);font-weight:900;
  font-size:clamp(120px,22vw,280px);line-height:1;
  color:rgba(255,255,255,.028);pointer-events:none
}
.c7-footer__inner{position:relative;z-index:1;max-width:var(--c7-content);margin:0 auto;padding:56px var(--c7-gutter) 40px;display:grid;grid-template-columns:1.35fr .7fr .7fr 1.1fr;gap:44px}
.c7-footer__brand{min-width:0}
.c7-brand--footer .c7-brand__glyph{font-size:36px}
.c7-brand--footer .c7-brand__text{font-size:20px}
.c7-footer__about{margin-top:18px;max-width:32em;font-size:14px;line-height:1.8;color:rgba(255,255,255,.58)}
.c7-footer__status{display:inline-flex;margin-top:14px;font-size:12px;color:rgba(255,255,255,.5)}
.c7-footer__col{min-width:0}
.c7-footer__heading{
  position:relative;display:flex;align-items:center;gap:8px;padding-left:12px;padding-bottom:10px;margin-bottom:16px;
  font-family:var(--c7-serif);font-size:17px;font-weight:700;color:#fff;letter-spacing:.06em;
  border-bottom:1px solid rgba(255,255,255,.12)
}
.c7-footer__heading::before{
  content:"";position:absolute;left:0;top:3px;bottom:3px;width:3px;border-radius:2px;
  background:linear-gradient(180deg,var(--c7-blue),var(--c7-purple))
}
.c7-footer__no{font-family:var(--c7-mono);font-size:11px;color:var(--c7-blue);letter-spacing:.08em}
.c7-footer__list,.c7-footer__contact{display:grid;gap:10px}
.c7-footer__link{
  display:inline-block;color:rgba(255,255,255,.7);text-decoration:none;font-size:14px;
  transition:color .2s,padding-left .2s
}
.c7-footer__link:hover{color:var(--c7-yellow);padding-left:6px}
.c7-footer__contact li{font-size:13px;color:rgba(255,255,255,.62);line-height:1.7}
.c7-footer__contact li::before{content:"—";color:var(--c7-blue);margin-right:8px}
.c7-footer__meta{position:relative;z-index:1;border-top:1px solid rgba(255,255,255,.1)}
.c7-footer__meta-inner{max-width:var(--c7-content);margin:0 auto;padding:18px var(--c7-gutter);display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:13px;color:rgba(255,255,255,.5)}
.c7-footer__copyright,.c7-footer__icp{margin:0}
.c7-footer__icp{font-family:var(--c7-mono);letter-spacing:.06em}

.c7-container{max-width:var(--c7-content);margin:0 auto;padding:0 var(--c7-gutter)}
.c7-section{padding:72px 0}
.c7-section__head{display:grid;gap:10px;margin-bottom:40px}
.c7-index{display:inline-flex;align-items:center;gap:10px;font-family:var(--c7-mono);font-size:12px;letter-spacing:.22em;color:var(--c7-red);text-transform:uppercase}
.c7-index::before{content:"";width:26px;height:2px;background:currentColor;border-radius:2px}
.c7-index--line{color:var(--c7-blue)}
.c7-title{font-family:var(--c7-serif);font-weight:900;font-size:clamp(30px,4.6vw,52px);line-height:1.16;color:var(--c7-ink);letter-spacing:.02em}
.c7-title--masthead{font-size:clamp(38px,6vw,68px)}
.c7-lead{font-family:var(--c7-sans);font-weight:300;font-size:16px;line-height:1.8;color:var(--c7-gray);max-width:42em}
.c7-lead--meta{font-family:var(--c7-mono);font-size:12px;letter-spacing:.14em}

.c7-breadcrumb{display:flex;flex-wrap:wrap;padding:16px 0;font-size:13px;color:var(--c7-gray)}
.c7-breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:6px 10px}
.c7-breadcrumb__item{display:inline-flex;align-items:center;gap:10px}
.c7-breadcrumb__link{color:var(--c7-gray);text-decoration:none;transition:color .2s}
.c7-breadcrumb__link:hover{color:var(--c7-blue)}
.c7-breadcrumb__sep{color:rgba(18,18,18,.35)}
.c7-breadcrumb__current{color:var(--c7-ink);font-weight:600}

.c7-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.c7-card{
  position:relative;display:flex;flex-direction:column;
  background:#fff;border:1px solid rgba(18,18,18,.1);border-radius:var(--c7-radius);
  overflow:hidden;box-shadow:0 12px 28px rgba(18,18,18,.06);
  transition:transform .3s var(--c7-ease),box-shadow .3s,border-color .3s
}
.c7-card:hover{transform:translateY(-4px);box-shadow:0 18px 40px rgba(18,18,18,.12);border-color:rgba(0,212,255,.5)}
.c7-card::before{
  content:"INDEX";position:absolute;top:12px;right:12px;z-index:2;
  font-family:var(--c7-mono);font-size:10px;letter-spacing:.2em;color:rgba(255,255,255,.8);
  background:rgba(18,18,18,.72);padding:4px 9px;border-radius:var(--c7-capsule)
}
.c7-card__media{
  position:relative;aspect-ratio:4/3;overflow:hidden;
  background:
    linear-gradient(135deg,rgba(124,46,62,.92),rgba(18,18,18,.88)),
    repeating-linear-gradient(45deg,rgba(0,212,255,.16) 0 1px,transparent 1px 12px)
}
.c7-card__media::after{
  content:"IMG / 04:03";position:absolute;left:12px;bottom:12px;
  font-family:var(--c7-mono);font-size:10px;letter-spacing:.18em;
  color:rgba(255,255,255,.82);background:rgba(18,18,18,.62);padding:4px 10px;border-radius:var(--c7-capsule)
}
.c7-card__media img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.c7-card__body{flex:1;padding:22px 24px 26px;display:grid;gap:10px}
.c7-card__title{font-family:var(--c7-serif);font-weight:700;font-size:20px;line-height:1.4;color:var(--c7-ink)}
.c7-card__text{font-size:14px;color:var(--c7-gray);line-height:1.7}

.c7-panel{border:1px solid rgba(18,18,18,.14);border-radius:var(--c7-radius-md);background:rgba(255,255,255,.72);overflow:hidden;transition:border-color .25s}
.c7-panel[data-open]{border-color:rgba(0,212,255,.55)}
.c7-panel__trigger{
  width:100%;display:flex;justify-content:space-between;align-items:center;gap:16px;
  padding:18px 22px;text-align:left;cursor:pointer;
  font-family:var(--c7-serif);font-weight:700;font-size:17px;color:var(--c7-ink)
}
.c7-panel__trigger::after{content:"+";font-family:var(--c7-mono);font-size:20px;color:var(--c7-red);transition:transform .3s var(--c7-ease)}
.c7-panel[data-open] .c7-panel__trigger::after{transform:rotate(45deg)}
.c7-panel__content{max-height:0;overflow:hidden;transition:max-height .4s var(--c7-ease)}
.c7-panel[data-open] .c7-panel__content{max-height:1200px}
.c7-panel__content-inner{padding:0 22px 22px;font-size:14px;line-height:1.8;color:var(--c7-gray)}

.c7-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 28px;border-radius:var(--c7-capsule);
  font-family:var(--c7-sans);font-size:14px;font-weight:500;letter-spacing:.1em;
  text-decoration:none;transition:background .25s,color .25s,border-color .25s,transform .2s
}
.c7-btn--primary{background:var(--c7-red);color:#fff;box-shadow:0 6px 18px rgba(124,46,62,.35)}
.c7-btn--primary:hover{background:#8f3446;transform:translateY(-2px)}
.c7-btn--ghost{border:1px solid rgba(18,18,18,.35);color:var(--c7-ink)}
.c7-btn--ghost:hover{border-color:var(--c7-blue);color:var(--c7-blue)}

.c7-tag{
  display:inline-flex;align-items:center;gap:6px;padding:4px 14px;
  border-radius:var(--c7-capsule);background:var(--c7-yellow);color:#1d1d1d;
  font-size:12px;font-weight:600;letter-spacing:.1em
}
.c7-tag::before{content:"◆";font-size:8px;color:var(--c7-red)}

.c7-prose{max-width:72ch;color:var(--c7-ink);font-size:16px;line-height:1.9}
.c7-prose h1,.c7-prose h2,.c7-prose h3,.c7-prose h4{font-family:var(--c7-serif);font-weight:700;margin:1.8em 0 .6em;line-height:1.3}
.c7-prose h1{font-size:28px}.c7-prose h2{font-size:24px}.c7-prose h3{font-size:20px}
.c7-prose p{margin:0 0 1.2em}
.c7-prose ul,.c7-prose ol{margin:0 0 1.2em;padding-left:1.4em}
.c7-prose ul{list-style:disc}.c7-prose ol{list-style:decimal}
.c7-prose blockquote{margin:1.4em 0;padding:14px 20px;border-left:3px solid var(--c7-red);background:rgba(124,46,62,.06);border-radius:0 var(--c7-radius-sm) var(--c7-radius-sm) 0;color:var(--c7-gray)}
.c7-prose a{color:var(--c7-blue);text-decoration:underline;text-underline-offset:4px}

.c7-media{
  position:relative;aspect-ratio:16/9;border-radius:var(--c7-radius);overflow:hidden;
  background:
    linear-gradient(135deg,rgba(124,46,62,.85),rgba(155,89,182,.55)),
    repeating-linear-gradient(45deg,rgba(0,212,255,.2) 0 1px,transparent 1px 14px)
}
.c7-media--wide{aspect-ratio:21/9}
.c7-media--square{aspect-ratio:1/1}
.c7-media::after{
  content:"FIGURE";position:absolute;left:14px;bottom:12px;
  font-family:var(--c7-mono);font-size:10px;letter-spacing:.2em;color:rgba(255,255,255,.8);
  background:rgba(18,18,18,.55);padding:4px 10px;border-radius:var(--c7-capsule)
}
.c7-media img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}

[data-reveal]{opacity:0;transform:translateY(18px);transition:opacity .55s var(--c7-ease),transform .55s var(--c7-ease)}
[data-reveal].is-revealed{opacity:1;transform:none}

.c7-backtop{
  position:fixed;right:28px;bottom:28px;z-index:90;
  width:48px;height:48px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  background:var(--c7-dark);border:1px solid rgba(0,212,255,.6);color:var(--c7-blue);
  box-shadow:0 8px 24px rgba(0,0,0,.3);
  opacity:0;visibility:hidden;transform:translateY(12px);
  transition:opacity .25s,transform .25s,visibility .25s
}
.c7-backtop.is-visible{opacity:1;visibility:visible;transform:translateY(0)}
.c7-backtop:hover{background:var(--c7-blue);color:var(--c7-dark);border-color:var(--c7-blue)}
.c7-backtop__arrow{font-size:20px;line-height:1}

@media (max-width:1080px){
  .c7-brand__glyph{font-size:40px}
  .c7-brand__text{font-size:21px}
  .c7-nav__index{display:none}
  .c7-footer__inner{grid-template-columns:1fr 1fr;gap:32px}
  .c7-grid{grid-template-columns:repeat(2,1fr)}
}

@media (max-width:820px){
  .c7-header__inner{padding-top:10px;padding-bottom:10px}
  .c7-masthead__side{display:none}
  .c7-nav-toggle{display:inline-flex}
  .c7-nav{
    position:absolute;top:100%;left:0;right:0;
    max-height:0;overflow:hidden;
    background-color:var(--c7-dark);
    background-image:
      linear-gradient(rgba(0,212,255,.05) 1px,transparent 1px),
      linear-gradient(90deg,rgba(0,212,255,.05) 1px,transparent 1px);
    background-size:32px 32px;
    border-top:1px solid rgba(255,255,255,.08);
    box-shadow:0 18px 36px rgba(0,0,0,.45);
    transition:max-height .38s var(--c7-ease)
  }
  .c7-nav[data-open]{max-height:70vh;overflow-y:auto}
  .c7-nav__inner{flex-direction:column;align-items:stretch;padding:8px 12px 16px;gap:12px}
  .c7-nav__list{flex-direction:column;gap:0}
  .c7-nav__item{flex:none;border-bottom:1px solid rgba(255,255,255,.07)}
  .c7-nav__link{justify-content:flex-start;padding:14px 12px;border-bottom:0}
}

@media (max-width:640px){
  .c7-brand__glyph{font-size:34px}
  .c7-brand__text{font-size:18px}
  .c7-brand__sub{font-size:10px;letter-spacing:.12em}
  .c7-section{padding:48px 0}
  .c7-grid{grid-template-columns:1fr;gap:20px}
  .c7-footer__inner{grid-template-columns:1fr;padding-top:40px}
  .c7-footer__meta-inner{flex-direction:column;gap:8px}
  .c7-backtop{right:18px;bottom:18px;width:44px;height:44px}
}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important
  }
  html{scroll-behavior:auto !important}
  .c7-status__dot{animation:none !important}
  [data-reveal]{opacity:1 !important;transform:none !important;transition:none !important}
}