/* ============================================================
   /assets/site.css — 共享外壳与基础组件
   深墨蓝基底 · 信号橙强调 · 荧光青状态
   ============================================================ */

/* ---------- 1. 变量 ---------- */
:root{
  --ink-900:#081426;
  --ink-800:#0c1b30;
  --ink-700:#122640;
  --signal-500:#FF6B2C;
  --signal-600:#ff8654;
  --cyan-400:#37E3D2;
  --warm-200:#D9D2C3;
  --warm-500:#8E8779;
  --paper-100:#F6F2E9;
  --green-400:#42C99A;
  --amber-500:#E6A23C;
  --link-400:#6FA8FF;

  --line-soft:rgba(217,210,195,.14);
  --line-strong:rgba(217,210,195,.30);
  --tint-cyan:rgba(55,227,210,.08);
  --tint-orange:rgba(255,107,44,.08);

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

  --shell:1360px;
  --gutter:clamp(1rem,3.2vw,2.5rem);
  --radius-s:2px;
  --radius-m:6px;
  --radius-l:14px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 2. Reset ---------- */
*,
*::before,
*::after{box-sizing:border-box;}

html{
  -webkit-text-size-adjust:100%;
  text-size-adjust:100%;
  scroll-behavior:smooth;
}

body{
  margin:0;
  background-color:var(--ink-900);
  color:var(--paper-100);
  font-family:var(--font-sans);
  font-size:clamp(.95rem,.9rem + .18vw,1.0625rem);
  line-height:1.8;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

h1,h2,h3,h4{
  margin:0 0 .6em;
  font-weight:700;
  line-height:1.15;
  letter-spacing:.06em;
}

p{margin:0 0 1em;}
ul,ol{margin:0;padding:0;}
img,svg,video{display:block;max-width:100%;height:auto;}
button{font:inherit;}
a{color:var(--link-400);text-underline-offset:.2em;}

::selection{
  background-color:var(--signal-500);
  color:#150a04;
}

#main-content{scroll-margin-top:1rem;}

/* ---------- 3. 焦点 ---------- */
:focus-visible{
  outline:2px solid var(--link-400);
  outline-offset:3px;
  border-radius:var(--radius-s);
}

.skip-link{
  position:absolute;
  left:1rem;
  top:-4.5rem;
  z-index:300;
  padding:.7rem 1.15rem;
  background-color:var(--signal-500);
  color:#150a04;
  font-weight:700;
  font-size:.875rem;
  letter-spacing:.05em;
  text-decoration:none;
  border-radius:0 0 var(--radius-m) var(--radius-m);
  transition:top .2s var(--ease);
}
.skip-link:focus{top:0;}

/* ---------- 4. 布局工具 ---------- */
.shell{
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
}

.grid-12{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:24px;
}

/* ---------- 5. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5rem;
  min-height:2.85rem;
  padding:.7rem 1.35rem;
  border:1px solid transparent;
  border-radius:var(--radius-m);
  font-family:var(--font-sans);
  font-size:.9375rem;
  font-weight:600;
  letter-spacing:.06em;
  line-height:1.3;
  text-decoration:none;
  cursor:pointer;
  transition:background-color .22s var(--ease),color .22s var(--ease),border-color .22s var(--ease),transform .22s var(--ease);
}
.btn--primary{
  background-color:var(--signal-500);
  border-color:var(--signal-500);
  color:#150a04;
}
.btn--primary:hover{background-color:var(--signal-600);border-color:var(--signal-600);}
.btn--ghost{
  background-color:transparent;
  border-color:var(--line-strong);
  color:var(--paper-100);
}
.btn--ghost:hover{border-color:var(--cyan-400);color:var(--cyan-400);}
.btn--quiet{
  background-color:var(--tint-cyan);
  border-color:rgba(55,227,210,.35);
  color:var(--cyan-400);
}
.btn--quiet:hover{background-color:rgba(55,227,210,.18);}
.btn:active{transform:translateY(1px);}

/* ---------- 6. 面包屑 ---------- */
.breadcrumb{
  padding-block:1.15rem;
  font-family:var(--font-mono);
  font-size:.75rem;
  letter-spacing:.05em;
  color:var(--warm-500);
}
.breadcrumb ol{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.35rem;
  margin:0;
  padding:0;
  list-style:none;
}
.breadcrumb li{display:inline-flex;align-items:center;}
.breadcrumb li::after{
  content:"/";
  margin-inline-start:.45rem;
  color:rgba(142,135,121,.55);
}
.breadcrumb li:last-child::after{content:"";}
.breadcrumb a{color:var(--warm-200);text-decoration:none;}
.breadcrumb a:hover{color:var(--cyan-400);}
.breadcrumb [aria-current="page"]{color:var(--warm-500);}

/* ---------- 7. 面板与玻璃层 ---------- */
.panel{
  background-color:var(--ink-700);
  border:1px solid var(--line-soft);
  border-radius:var(--radius-l);
  padding:clamp(1.1rem,2.2vw,1.75rem);
}
.panel-glass{
  background:linear-gradient(150deg,rgba(18,38,64,.72),rgba(8,20,38,.56));
  border:1px solid rgba(217,210,195,.16);
  border-radius:var(--radius-l);
  padding:clamp(1.1rem,2.2vw,1.75rem);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
}

/* ---------- 8. 图片容器基础规则 ---------- */
.media-frame{
  position:relative;
  overflow:hidden;
  width:100%;
  aspect-ratio:16 / 10;
  border:1px solid var(--line-soft);
  border-radius:var(--radius-l);
  background:
    radial-gradient(120% 90% at 12% 0%,rgba(55,227,210,.14),transparent 62%),
    radial-gradient(120% 90% at 92% 100%,rgba(255,107,44,.14),transparent 62%),
    linear-gradient(150deg,var(--ink-700),var(--ink-900));
}
.media-frame > img,
.media-frame > picture,
.media-frame > picture img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}
.media-frame--wide{aspect-ratio:21 / 9;}
.media-frame--tall{aspect-ratio:4 / 5;}
.media-frame--square{aspect-ratio:1 / 1;}

/* ============================================================
   9. 页头
   ============================================================ */
.site-header{
  position:relative;
  z-index:60;
  background:
    radial-gradient(1200px 320px at 14% -46%,rgba(55,227,210,.16),transparent 70%),
    radial-gradient(980px 300px at 88% -52%,rgba(255,107,44,.14),transparent 72%),
    linear-gradient(180deg,#0a192e 0%,var(--ink-900) 100%);
  border-bottom:1px solid var(--line-soft);
  box-shadow:0 26px 60px -44px rgba(0,0,0,.95);
}
.site-header::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:-1px;
  height:1px;
  pointer-events:none;
  background:linear-gradient(90deg,rgba(55,227,210,.75),rgba(55,227,210,0) 42%,rgba(255,107,44,0) 62%,rgba(255,107,44,.8));
}

.scroll-meter{
  position:fixed;
  inset:0 0 auto 0;
  height:2px;
  z-index:200;
  pointer-events:none;
  background-color:rgba(217,210,195,.08);
}
.scroll-meter-fill{
  display:block;
  width:100%;
  height:100%;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan-400),var(--signal-500));
}

.header-shell{
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
}

/* 状态横条 */
.header-strip{
  display:flex;
  align-items:center;
  gap:clamp(.6rem,1.6vw,1.5rem);
  min-height:2.6rem;
  padding-block:.45rem;
  border-bottom:1px solid rgba(217,210,195,.1);
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.08em;
  color:var(--warm-500);
}
.edition-badge{
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  margin:0;
  color:var(--cyan-400);
  white-space:nowrap;
}
.edition-dot{
  width:.5rem;
  height:.5rem;
  flex:none;
  border-radius:50%;
  background-color:var(--cyan-400);
  box-shadow:0 0 0 0 rgba(55,227,210,.5);
  animation:editionPulse 2.8s var(--ease) infinite;
}
@keyframes editionPulse{
  0%{box-shadow:0 0 0 0 rgba(55,227,210,.45);}
  70%{box-shadow:0 0 0 .5rem rgba(55,227,210,0);}
  100%{box-shadow:0 0 0 0 rgba(55,227,210,0);}
}

.utility-links{
  display:flex;
  align-items:center;
  gap:1rem;
  margin:0 0 0 auto;
  padding:0;
  list-style:none;
}
.utility-links a{
  color:var(--warm-200);
  text-decoration:none;
  padding-bottom:.1rem;
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.utility-links a:hover,
.utility-links a:focus-visible{
  color:var(--cyan-400);
  border-bottom-color:var(--cyan-400);
}

.strip-action{
  display:inline-flex;
  align-items:center;
  gap:.4rem;
  padding:.34rem .75rem;
  border:1px solid rgba(255,107,44,.55);
  border-radius:999px;
  color:var(--signal-500);
  font-size:.6875rem;
  letter-spacing:.06em;
  text-decoration:none;
  white-space:nowrap;
  transition:background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.strip-action::after{content:"→";line-height:1;}
.strip-action:hover,
.strip-action:focus-visible{
  background-color:var(--signal-500);
  border-color:var(--signal-500);
  color:#150a04;
}

/* 报头 */
.masthead{
  display:flex;
  align-items:center;
  justify-content:center;
  gap:clamp(1rem,3vw,2.5rem);
  padding:clamp(.85rem,2vw,1.35rem) 0;
}
.masthead-rule{
  flex:1 1 0;
  min-width:1.5rem;
  height:1px;
  background:linear-gradient(90deg,transparent,rgba(217,210,195,.34),transparent);
}
.masthead-brand{
  flex:none;
  display:inline-flex;
  flex-direction:column;
  align-items:center;
  text-decoration:none;
  color:var(--paper-100);
}
.masthead-name{
  font-size:clamp(1.3rem,2.3vw,1.85rem);
  font-weight:700;
  letter-spacing:.24em;
  margin-inline-end:-.24em;
  line-height:1.2;
  transition:color .25s var(--ease);
}
.masthead-brand:hover .masthead-name,
.masthead-brand:focus-visible .masthead-name{color:var(--cyan-400);}

/* 导航 */
.site-nav{border-top:1px solid rgba(217,210,195,.1);}
.nav-list{
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  margin:0;
  padding:0;
  list-style:none;
}
.nav-link{
  display:inline-flex;
  align-items:baseline;
  gap:.45rem;
  padding:.85rem clamp(.7rem,1.5vw,1.25rem);
  color:var(--warm-200);
  font-size:.9375rem;
  letter-spacing:.05em;
  text-decoration:none;
  border-bottom:2px solid transparent;
  transition:color .22s var(--ease),border-color .22s var(--ease),background-color .22s var(--ease);
}
.nav-index{
  font-family:var(--font-mono);
  font-size:.625rem;
  letter-spacing:.04em;
  color:var(--warm-500);
  transition:color .22s var(--ease);
}
.nav-label{font-weight:500;}
.nav-link:hover,
.nav-link:focus-visible{
  color:var(--paper-100);
  background-color:var(--tint-cyan);
  border-bottom-color:var(--cyan-400);
}
.nav-link:hover .nav-index,
.nav-link:focus-visible .nav-index{color:var(--cyan-400);}
.nav-link[aria-current="page"]{
  color:var(--signal-500);
  background-color:var(--tint-orange);
  border-bottom-color:var(--signal-500);
}
.nav-link[aria-current="page"] .nav-index{color:var(--signal-500);}

/* 移动按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:.55rem;
  flex:none;
  padding:.5rem .8rem;
  background-color:rgba(55,227,210,.09);
  border:1px solid var(--line-strong);
  border-radius:var(--radius-m);
  color:var(--paper-100);
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.12em;
  cursor:pointer;
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan-400);color:var(--cyan-400);}
.nav-toggle-bars{
  position:relative;
  display:block;
  width:1.05rem;
  height:2px;
  background-color:var(--cyan-400);
  transition:background-color .2s var(--ease);
}
.nav-toggle-bars::before,
.nav-toggle-bars::after{
  content:"";
  position:absolute;
  left:0;
  width:100%;
  height:2px;
  background-color:var(--cyan-400);
  transition:transform .25s var(--ease);
}
.nav-toggle-bars::before{top:-5px;}
.nav-toggle-bars::after{top:5px;}
.site-header[data-open] .nav-toggle-bars{background-color:transparent;}
.site-header[data-open] .nav-toggle-bars::before{transform:translateY(5px) rotate(45deg);}
.site-header[data-open] .nav-toggle-bars::after{transform:translateY(-5px) rotate(-45deg);}

/* ============================================================
   10. 页脚
   ============================================================ */
.site-footer{
  position:relative;
  margin-top:clamp(2rem,5vw,4rem);
  background:
    radial-gradient(900px 260px at 10% 0%,rgba(55,227,210,.11),transparent 70%),
    radial-gradient(760px 240px at 94% 112%,rgba(255,107,44,.11),transparent 72%),
    var(--ink-800);
  border-top:1px solid var(--line-strong);
  color:var(--warm-200);
  font-size:.9375rem;
}
.site-footer::before{
  content:"";
  display:block;
  height:2px;
  background:linear-gradient(90deg,var(--cyan-400),rgba(55,227,210,0) 55%,rgba(255,107,44,.9));
}
.footer-shell{
  max-width:var(--shell);
  margin-inline:auto;
  padding:clamp(2rem,4vw,3.25rem) var(--gutter) 1.5rem;
}
.footer-grid{
  display:grid;
  grid-template-columns:minmax(0,1.6fr) minmax(0,.8fr) minmax(0,.8fr) minmax(0,1.35fr);
  gap:clamp(1.5rem,3vw,3rem);
}
.footer-brand-name{
  margin:0 0 .55rem;
  font-size:clamp(1.05rem,1.8vw,1.3rem);
  font-weight:700;
  letter-spacing:.16em;
  color:var(--paper-100);
}
.footer-statement{
  margin:0 0 .9rem;
  max-width:34ch;
  font-size:.9rem;
  line-height:1.75;
  color:var(--warm-200);
}
.footer-status{
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  margin:0;
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.09em;
  color:var(--green-400);
}
.status-dot{
  width:.45rem;
  height:.45rem;
  flex:none;
  border-radius:50%;
  background-color:var(--green-400);
  box-shadow:0 0 0 .25rem rgba(66,201,154,.16);
}
.footer-col-title{
  margin:0 0 .85rem;
  font-family:var(--font-mono);
  font-size:.6875rem;
  font-weight:600;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--warm-500);
}
.footer-links{
  display:grid;
  gap:.55rem;
  margin:0;
  padding:0;
  list-style:none;
}
.footer-links a{
  color:var(--warm-200);
  font-size:.9375rem;
  text-decoration:none;
  transition:color .2s var(--ease);
}
.footer-links a:hover,
.footer-links a:focus-visible{
  color:var(--cyan-400);
  text-decoration:underline;
  text-decoration-color:rgba(55,227,210,.5);
  text-underline-offset:.3em;
}
.contact-list{
  display:grid;
  gap:.65rem;
  margin:0;
}
.contact-row{
  display:grid;
  grid-template-columns:3.2rem minmax(0,1fr);
  gap:.75rem;
  align-items:baseline;
}
.contact-row dt{
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.08em;
  color:var(--warm-500);
}
.contact-row dd{
  margin:0;
  font-size:.875rem;
  line-height:1.6;
  color:var(--warm-200);
  overflow-wrap:anywhere;
}
.footer-base{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:.75rem 1.5rem;
  margin-top:clamp(1.75rem,3.5vw,2.75rem);
  padding-top:1.1rem;
  border-top:1px solid var(--line-soft);
  font-family:var(--font-mono);
  font-size:.75rem;
  letter-spacing:.05em;
  color:var(--warm-500);
}
.footer-legal,
.footer-copy{margin:0;}

/* ============================================================
   11. 响应式
   ============================================================ */
@media (max-width:1024px){
  .grid-12{grid-template-columns:repeat(6,minmax(0,1fr));}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
}

@media (max-width:900px){
  .masthead{
    justify-content:space-between;
    gap:.75rem;
    padding:.8rem 0;
  }
  .masthead-rule{display:none;}
  .masthead-brand{align-items:flex-start;}
  .nav-toggle{display:inline-flex;}
  .site-nav{display:none;}
  .site-header[data-open] .site-nav{display:block;}
  .nav-list{
    flex-direction:column;
    align-items:stretch;
    padding-block:.4rem;
  }
  .nav-link{
    width:100%;
    justify-content:flex-start;
    gap:.7rem;
    padding:.85rem .2rem;
    border-bottom:1px solid rgba(217,210,195,.1);
    border-left:2px solid transparent;
  }
  .nav-link:hover,
  .nav-link:focus-visible{
    border-left-color:var(--cyan-400);
    border-bottom-color:rgba(217,210,195,.1);
  }
  .nav-link[aria-current="page"]{
    border-left-color:var(--signal-500);
    border-bottom-color:rgba(217,210,195,.1);
  }
  .nav-index{min-width:1.6rem;}
  .utility-links{display:none;}
  .strip-action{margin-inline-start:auto;}
}

@media (max-width:640px){
  .grid-12{grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;}
  .header-strip{
    flex-wrap:wrap;
    gap:.5rem .9rem;
    font-size:.625rem;
  }
  .masthead-name{font-size:1.2rem;letter-spacing:.18em;margin-inline-end:-.18em;}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:1.75rem;}
  .footer-base{flex-direction:column;align-items:flex-start;}
  .contact-row{grid-template-columns:3rem minmax(0,1fr);}
}

@media (max-width:380px){
  .strip-action{width:100%;justify-content:center;}
}

/* ============================================================
   12. 动效偏好
   ============================================================ */
@media (prefers-reduced-motion:no-preference){
  .site-header[data-open] .site-nav{
    animation:navDrop .26s var(--ease) both;
  }
  @keyframes navDrop{
    from{opacity:0;transform:translateY(-6px);}
    to{opacity:1;transform:none;}
  }
}

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