*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0;}
ul,ol{padding:0;list-style:none;}
a{color:inherit;text-decoration:none;}
button{font:inherit;color:inherit;background:none;border:0;}
img,svg,picture{display:block;max-width:100%;}

:root{
  --deep:#0B2A25;
  --deep-2:#173B36;
  --char:#111816;
  --moss:#1E4A3F;
  --tech:#081F1B;
  --cyan:#35E0D0;
  --gold:#E5B85C;
  --gold-soft:#F1D9A4;
  --coral:#FF6B5A;
  --mist:#F2F7F4;
  --gray-cyan:#8CA9A1;
  --line:rgba(140,169,161,.24);
  --line-strong:rgba(140,169,161,.46);
  --font-display:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;
  --ease:cubic-bezier(.22,.61,.36,1);
}

html,body{background:var(--deep);}
body{
  color:var(--mist);
  font-family:var(--font-display);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{font-weight:900;line-height:1.18;letter-spacing:-.01em;}
strong{font-weight:700;}
::selection{background:rgba(53,224,208,.28);color:var(--mist);}

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

.shell{
  width:100%;
  max-width:1220px;
  margin-inline:auto;
  padding-inline:clamp(18px,4vw,40px);
}
.site-main{padding-block:clamp(28px,4vw,56px);}

/* ---------- skip link ---------- */
.skip-link{
  position:fixed;
  top:12px;
  left:12px;
  z-index:300;
  padding:10px 16px;
  background:var(--cyan);
  color:#06211D;
  font-weight:700;
  font-size:14px;
  border-radius:2px;
  transform:translateY(-180%);
  transition:transform .18s var(--ease);
}
.skip-link:focus,.skip-link:focus-visible{transform:translateY(0);}

/* ---------- scroll progress ---------- */
.scroll-progress{
  position:fixed;
  top:0;left:0;right:0;
  height:3px;
  z-index:200;
  pointer-events:none;
  background:rgba(242,247,244,.07);
}
.scroll-progress__bar{
  display:block;
  height:100%;
  width:100%;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan) 0%,var(--gold) 72%,var(--coral) 100%);
}

/* ---------- header ---------- */
.site-header{
  position:relative;
  z-index:40;
  background:var(--deep);
  border-bottom:1px solid var(--line);
}

.utility{
  background:var(--char);
  border-bottom:1px solid rgba(140,169,161,.16);
  font-size:13px;
}
.utility-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:10px 18px;
  flex-wrap:wrap;
  min-height:46px;
  padding-block:6px;
}
.utility-tip{
  display:flex;
  align-items:center;
  gap:9px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.05em;
  color:var(--gray-cyan);
}
.utility-dot{
  width:6px;height:6px;
  border-radius:50%;
  background:var(--cyan);
  box-shadow:0 0 0 3px rgba(53,224,208,.16);
  flex:0 0 auto;
}

.version-switch{
  position:relative;
  display:flex;
  align-items:center;
  gap:7px;
  flex-wrap:wrap;
}
.version-switch__label{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  color:var(--gray-cyan);
}
.version-switch__btn{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.03em;
  padding:5px 11px;
  border:1px solid rgba(140,169,161,.34);
  border-radius:2px;
  color:var(--gray-cyan);
  cursor:pointer;
  transition:color .16s var(--ease),border-color .16s var(--ease),background-color .16s var(--ease);
}
.version-switch__btn:hover{color:var(--mist);border-color:var(--line-strong);}
.version-switch__btn.is-active{
  background:var(--cyan);
  border-color:var(--cyan);
  color:#06211D;
  font-weight:600;
}
.version-switch__note{
  position:absolute;
  top:calc(100% + 12px);
  right:0;
  width:min(330px,86vw);
  padding:12px 14px;
  background:var(--char);
  color:var(--mist);
  font-size:13px;
  line-height:1.7;
  border:1px solid var(--line-strong);
  border-left:2px solid var(--gold);
  border-radius:2px;
  box-shadow:0 18px 44px rgba(0,0,0,.55);
  opacity:0;
  visibility:hidden;
  transform:translateY(-5px);
  transition:opacity .18s var(--ease),transform .18s var(--ease),visibility .18s var(--ease);
  z-index:60;
}
.version-switch.is-open .version-switch__note{
  opacity:1;
  visibility:visible;
  transform:translateY(0);
}

.masthead{
  position:relative;
  overflow:hidden;
  background:linear-gradient(180deg,rgba(23,59,54,.6) 0%,rgba(11,42,37,0) 100%);
  border-bottom:1px solid var(--line);
}
.masthead::before{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(115deg,rgba(53,224,208,.07) 0%,rgba(53,224,208,.07) 30%,rgba(53,224,208,0) 30.4%,rgba(53,224,208,0) 100%);
  pointer-events:none;
}
.masthead::after{
  content:"";
  position:absolute;
  top:0;right:0;
  width:min(54%,640px);
  height:100%;
  background:linear-gradient(200deg,rgba(30,74,63,.88) 0%,rgba(30,74,63,0) 88%);
  clip-path:polygon(26% 0,100% 0,100% 100%,0 100%);
  pointer-events:none;
}
.masthead-inner{
  position:relative;
  z-index:2;
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:end;
  gap:16px;
  padding-block:clamp(20px,3.4vw,38px);
}
.masthead-kicker{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.18em;
  color:var(--gold);
  align-self:center;
}
.masthead-brand{
  position:relative;
  justify-self:center;
  padding-bottom:12px;
  font-family:var(--font-display);
  font-size:clamp(30px,5.2vw,54px);
  font-weight:900;
  line-height:1.05;
  letter-spacing:-.02em;
  color:var(--mist);
  text-align:center;
  transition:color .18s var(--ease);
}
.masthead-brand::after{
  content:"";
  position:absolute;
  left:50%;
  bottom:0;
  width:64px;
  height:3px;
  transform:translateX(-50%);
  background:linear-gradient(90deg,var(--cyan),var(--gold));
  transition:width .2s var(--ease);
}
.masthead-brand:hover{color:var(--cyan);}
.masthead-brand:hover::after{width:104px;}
.masthead-meta{
  justify-self:end;
  align-self:center;
  text-align:right;
  font-family:var(--font-mono);
  font-size:12px;
  line-height:2;
  letter-spacing:.04em;
  color:var(--gray-cyan);
}
.masthead-meta strong{color:var(--gold);font-weight:600;}

.nav-bar{
  position:relative;
  background:var(--char);
  border-bottom:1px solid var(--line);
}
.nav-bar-inner{
  position:relative;
  display:flex;
  align-items:center;
  justify-content:center;
  gap:12px;
  min-height:56px;
}
.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  padding:9px 13px;
  border:1px solid var(--line-strong);
  border-radius:2px;
  color:var(--mist);
  cursor:pointer;
  transition:color .16s var(--ease),border-color .16s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan);}
.nav-toggle__bar{
  display:block;
  width:16px;
  height:2px;
  background:currentColor;
  box-shadow:0 5px 0 currentColor,0 -5px 0 currentColor;
}
.nav-toggle__text{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
}
.site-header[data-open] .nav-toggle{border-color:var(--cyan);color:var(--cyan);}

.site-nav__list{display:flex;align-items:stretch;}
.site-nav__list > li{display:flex;}
.site-nav__list > li + li{border-left:1px solid rgba(140,169,161,.2);}
.site-nav__link{
  position:relative;
  display:flex;
  align-items:center;
  min-height:56px;
  padding:0 22px;
  font-size:15px;
  font-weight:500;
  color:rgba(242,247,244,.82);
  transition:color .16s var(--ease),background-color .16s var(--ease);
}
.site-nav__link::before{
  content:"";
  position:absolute;
  left:0;right:0;bottom:0;
  height:2px;
  background:var(--cyan);
  transform:scaleX(0);
  transform-origin:center;
  transition:transform .18s var(--ease);
}
.site-nav__link:hover{color:var(--mist);background:rgba(53,224,208,.07);}
.site-nav__link:hover::before{transform:scaleX(1);}
.site-nav__link[aria-current="page"]{color:var(--cyan);background:rgba(53,224,208,.08);}
.site-nav__link[aria-current="page"]::before{
  transform:scaleX(1);
  background:linear-gradient(90deg,var(--cyan),var(--gold));
}

.session-index{
  position:relative;
  background:var(--deep-2);
  border-bottom:1px solid var(--line);
}
.session-index__scroll{
  display:flex;
  align-items:center;
  overflow-x:auto;
  overscroll-behavior-x:contain;
  scrollbar-width:thin;
  scrollbar-color:rgba(53,224,208,.45) transparent;
  -webkit-overflow-scrolling:touch;
}
.session-index__scroll::-webkit-scrollbar{height:5px;}
.session-index__scroll::-webkit-scrollbar-track{background:transparent;}
.session-index__scroll::-webkit-scrollbar-thumb{background:rgba(53,224,208,.38);border-radius:99px;}
.session-index__tag{
  flex:0 0 auto;
  margin-right:16px;
  padding:14px 16px 14px 0;
  border-right:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.22em;
  color:var(--gold);
}
.session-item{
  flex:0 0 auto;
  display:flex;
  align-items:center;
  gap:9px;
  padding:13px 18px;
  border-right:1px solid rgba(140,169,161,.14);
}
.session-item__code{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--gold);
}
.session-item__name{
  font-size:13px;
  color:rgba(242,247,244,.8);
  white-space:nowrap;
}
.session-item__status{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.08em;
  padding:2px 7px;
  border:1px solid currentColor;
  border-radius:999px;
  white-space:nowrap;
}
.session-item__status.is-confirmed{color:var(--cyan);}
.session-item__status.is-pending{color:var(--gold-soft);}
.session-item__status.is-change{color:var(--coral);}
.session-index__more{
  flex:0 0 auto;
  margin-left:auto;
  padding:13px 0 13px 20px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--cyan);
  white-space:nowrap;
  transition:color .16s var(--ease);
}
.session-index__more::after{content:" →";}
.session-index__more:hover{color:var(--gold);}

/* ---------- footer ---------- */
.site-footer{
  position:relative;
  background:var(--char);
  color:rgba(242,247,244,.8);
  border-top:1px solid var(--line);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:0;left:0;right:0;
  height:2px;
  background:linear-gradient(90deg,var(--cyan) 0%,rgba(53,224,208,0) 42%,var(--gold) 78%,var(--coral) 100%);
}
.footer-top{
  position:relative;
  overflow:hidden;
  padding-block:clamp(38px,6vw,72px);
}
.footer-top::before{
  content:"";
  position:absolute;
  left:0;bottom:0;
  width:min(60%,700px);
  height:100%;
  background:linear-gradient(160deg,rgba(30,74,63,.6) 0%,rgba(17,24,22,0) 90%);
  clip-path:polygon(0 0,100% 100%,0 100%);
  pointer-events:none;
}
.footer-top__inner{
  position:relative;
  z-index:1;
  display:grid;
  grid-template-columns:1.5fr 1fr 1.3fr;
  gap:clamp(24px,4vw,56px);
}
.footer-brand__mark{
  font-size:clamp(21px,2.6vw,28px);
  font-weight:900;
  letter-spacing:-.01em;
  line-height:1.35;
  color:var(--mist);
}
.footer-brand__line{
  margin-top:12px;
  max-width:34ch;
  font-size:14px;
  line-height:1.8;
  color:var(--gray-cyan);
}
.footer-version{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  margin-top:22px;
}
.footer-version__label{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.18em;
  color:var(--gray-cyan);
}
.footer-version__link{
  font-family:var(--font-mono);
  font-size:12px;
  padding:5px 10px;
  border:1px solid rgba(140,169,161,.34);
  border-radius:2px;
  color:var(--mist);
  transition:color .16s var(--ease),border-color .16s var(--ease),background-color .16s var(--ease);
}
.footer-version__link:hover{
  color:var(--cyan);
  border-color:var(--cyan);
  background:rgba(53,224,208,.08);
}
.footer-nav__title,.footer-contact__title{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.22em;
  color:var(--gold);
  margin-bottom:16px;
}
.footer-nav__list{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:0 18px;
}
.footer-nav__link{
  display:block;
  padding:7px 0;
  font-size:14px;
  color:rgba(242,247,244,.78);
  border-bottom:1px solid transparent;
  transition:color .16s var(--ease),border-color .16s var(--ease),padding-left .16s var(--ease);
}
.footer-nav__link:hover{
  color:var(--cyan);
  border-bottom-color:rgba(53,224,208,.45);
  padding-left:6px;
}
.footer-contact__row{
  display:grid;
  grid-template-columns:auto 1fr;
  gap:10px;
  padding:8px 0;
  font-size:14px;
  border-bottom:1px dashed rgba(140,169,161,.18);
}
.footer-contact__label{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--gray-cyan);
  padding-top:3px;
}
.footer-contact__value{
  color:rgba(242,247,244,.86);
  word-break:break-word;
}
.footer-contact__note{
  margin-top:14px;
  font-size:13px;
  line-height:1.7;
  color:var(--gray-cyan);
}
.footer-bottom{
  background:rgba(8,31,27,.6);
  border-top:1px solid rgba(140,169,161,.16);
  padding-block:18px;
}
.footer-bottom__inner{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:8px 26px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--gray-cyan);
}
.footer-bottom__legal{color:rgba(242,247,244,.72);}
.footer-bottom__note{color:var(--gray-cyan);}
.footer-bottom__icp{color:var(--gold);}

/* ---------- shared page components ---------- */
.section{padding-block:clamp(48px,7vw,96px);}
.section--tight{padding-block:clamp(32px,4.5vw,58px);}
.section--alt{background:var(--char);}
.section--moss{background:linear-gradient(180deg,rgba(30,74,63,.6) 0%,rgba(11,42,37,.2) 100%);}

.eyebrow{
  display:block;
  margin-bottom:10px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.18em;
  color:var(--cyan);
}
.eyebrow::before{content:"// ";color:var(--gold);}
.section-title{
  font-size:clamp(25px,3.4vw,36px);
  font-weight:900;
  letter-spacing:-.01em;
  color:var(--mist);
}
.lede{
  margin-top:14px;
  max-width:60ch;
  font-size:17px;
  line-height:1.85;
  color:rgba(242,247,244,.8);
}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:12px 22px;
  border:1px solid transparent;
  border-radius:2px;
  font-size:15px;
  font-weight:600;
  letter-spacing:.01em;
  cursor:pointer;
  transition:background-color .16s var(--ease),color .16s var(--ease),border-color .16s var(--ease);
}
.btn--primary{background:var(--cyan);color:#06211D;}
.btn--primary:hover{background:#5cf0e2;}
.btn--gold{background:var(--gold);color:#241A05;}
.btn--gold:hover{background:var(--gold-soft);}
.btn--ghost{border-color:var(--line-strong);color:var(--mist);}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan);background:rgba(53,224,208,.08);}

.breadcrumb{margin-bottom:22px;}
.breadcrumb__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--gray-cyan);
}
.breadcrumb__item{display:flex;align-items:center;gap:8px;}
.breadcrumb__item + .breadcrumb__item::before{content:"/";color:rgba(140,169,161,.5);}
.breadcrumb__link{
  color:rgba(242,247,244,.82);
  border-bottom:1px solid transparent;
  transition:color .16s var(--ease),border-color .16s var(--ease);
}
.breadcrumb__link:hover{color:var(--cyan);border-bottom-color:var(--cyan);}

.grid{display:grid;gap:clamp(16px,2.2vw,26px);}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(280px,1fr));}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(240px,1fr));}

.card{
  position:relative;
  padding:clamp(18px,2.4vw,26px);
  background:rgba(23,59,54,.5);
  border:1px solid var(--line);
  border-radius:2px;
  transition:border-color .18s var(--ease),background-color .18s var(--ease),box-shadow .18s var(--ease);
}
.card:hover{
  border-color:rgba(53,224,208,.6);
  background:rgba(23,59,54,.74);
  box-shadow:0 16px 34px rgba(0,0,0,.32);
}
.card__index{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--gold);
}
.card__title{
  margin-top:10px;
  font-size:20px;
  font-weight:700;
  line-height:1.4;
  color:var(--mist);
}
.card__text{
  margin-top:8px;
  font-size:15px;
  line-height:1.8;
  color:rgba(242,247,244,.76);
}
.card__meta{
  margin-top:16px;
  padding-top:12px;
  border-top:1px dashed rgba(140,169,161,.22);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--gray-cyan);
}

.tag{
  display:inline-flex;
  align-items:center;
  padding:3px 8px;
  border:1px solid currentColor;
  border-radius:2px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  line-height:1.5;
}
.tag--cyan{color:var(--cyan);}
.tag--gold{color:var(--gold);}
.tag--coral{color:var(--coral);}

.media-frame{
  position:relative;
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:2px;
  background:linear-gradient(150deg,rgba(30,74,63,.92) 0%,rgba(8,31,27,.96) 100%);
  aspect-ratio:16/9;
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(120deg,rgba(53,224,208,0) 0%,rgba(53,224,208,0) 54%,rgba(53,224,208,.14) 54.4%,rgba(53,224,208,0) 78%);
  pointer-events:none;
}
.media-frame img{width:100%;height:100%;object-fit:cover;}
.media-frame--wide{aspect-ratio:21/9;}
.media-frame--square{aspect-ratio:1/1;}
.media-frame--tall{aspect-ratio:3/4;}
.media-frame__caption{
  position:absolute;
  left:0;bottom:0;
  z-index:2;
  padding:8px 12px;
  background:rgba(8,31,27,.82);
  border-top:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--mist);
}

.prose{
  max-width:68ch;
  font-size:15px;
  line-height:1.95;
  color:rgba(242,247,244,.82);
}
.prose p + p{margin-top:14px;}
.prose h2,.prose h3{margin-top:28px;color:var(--mist);}
.prose ul{margin-top:14px;padding-left:18px;list-style:disc;}
.prose li{margin-top:6px;}
.prose a{color:var(--cyan);border-bottom:1px solid rgba(53,224,208,.4);}

/* ---------- responsive ---------- */
@media (max-width:1024px){
  .site-nav__link{padding:0 16px;font-size:14px;}
  .footer-top__inner{grid-template-columns:1fr 1fr;gap:clamp(24px,4vw,40px);}
  .footer-brand{grid-column:1 / -1;}
}

@media (max-width:860px){
  .masthead-inner{grid-template-columns:1fr;justify-items:center;text-align:center;gap:10px;padding-block:26px;}
  .masthead-kicker{align-self:auto;}
  .masthead-meta{justify-self:center;text-align:center;}
  .masthead::after{width:100%;opacity:.55;}

  .nav-bar-inner{justify-content:flex-start;min-height:54px;}
  .nav-toggle{display:inline-flex;}
  .site-nav{
    position:absolute;
    top:100%;left:0;right:0;
    z-index:55;
    background:var(--char);
    border-top:1px solid var(--line);
    border-bottom:1px solid var(--line-strong);
    max-height:0;
    overflow:hidden;
    opacity:0;
    visibility:hidden;
    transition:max-height .22s var(--ease),opacity .16s var(--ease),visibility .16s var(--ease);
  }
  .site-header[data-open] .site-nav{
    max-height:32rem;
    opacity:1;
    visibility:visible;
  }
  .site-nav__list{flex-direction:column;}
  .site-nav__list > li + li{border-left:0;border-top:1px solid var(--line);}
  .site-nav__link{min-height:0;padding:14px 20px;font-size:15px;}
  .site-nav__link::before{
    left:0;top:0;bottom:0;right:auto;
    width:3px;height:auto;
    transform:scaleY(0);
  }
  .site-nav__link:hover::before,
  .site-nav__link[aria-current="page"]::before{transform:scaleY(1);}

  .footer-top__inner{grid-template-columns:1fr;}
  .footer-brand__line{max-width:none;}
}

@media (max-width:640px){
  .utility-inner{justify-content:flex-start;row-gap:10px;padding-block:10px;}
  .version-switch__note{right:auto;left:0;width:min(320px,88vw);}
  .session-item{padding:11px 14px;}
  .session-index__tag{margin-right:12px;}
  .footer-nav__list{grid-template-columns:1fr 1fr;}
  .footer-bottom__inner{justify-content:flex-start;gap:6px 18px;}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    transition-delay:0ms !important;
  }
}