/* ==========================================================================
   恒峰主页 · /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 页头 / 页脚 / 通用组件
   ========================================================================== */

/* --- reset ---------------------------------------------------------------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0}
h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,picture,svg,video{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;padding:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
@media (prefers-reduced-motion: reduce){html{scroll-behavior:auto}}

/* --- tokens --------------------------------------------------------------- */
:root{
  --navy:#0A2540;
  --navy-deep:#061729;
  --mist:#D7E1EA;
  --cyan:#00E5C7;
  --cyan-ink:#03897B;
  --orange:#FF7A45;
  --orange-ink:#BF4C20;
  --violet:#7C5CFF;
  --rock:#3C4A57;
  --clay:#B9714F;
  --moss:#5E7A5A;
  --cream:#F4F1EA;
  --white:#FFFFFF;

  --fg:var(--mist);
  --line:rgba(60,74,87,.62);
  --line-soft:rgba(60,74,87,.38);
  --line-cyan:rgba(0,229,199,.22);
  --grid-line:rgba(60,74,87,.16);

  --font-display:"Inter","Inter Tight","Segoe UI",system-ui,"PingFang SC","Microsoft YaHei",sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --shell:1320px;
  --gutter:24px;
  --cut:18px;
  --dur:220ms;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* --- base type ------------------------------------------------------------ */
body{
  background:var(--navy);
  color:var(--fg);
  font-family:var(--font-body);
  font-size:16.5px;
  line-height:1.75;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4,h5{
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.14;
  color:var(--white);
  letter-spacing:-.01em;
}
strong{font-weight:700}
.mono{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.13em;
  text-transform:uppercase;
}

/* --- a11y ---------------------------------------------------------------- */
:focus-visible{
  outline:2px solid var(--cyan);
  outline-offset:3px;
  border-radius:2px;
}
.panel:focus-visible,
.panel--cut:focus-visible,
.cut:focus-visible{
  outline:none;
  box-shadow:inset 0 0 0 2px var(--cyan);
}
.skip-link{
  position:absolute;
  left:12px;
  top:-72px;
  z-index:120;
  display:inline-block;
  padding:10px 18px;
  background:var(--cyan);
  color:var(--navy-deep);
  font-family:var(--font-display);
  font-weight:800;
  font-size:14px;
  border-radius:3px;
  transition:top var(--dur) var(--ease);
}
.skip-link:focus{top:12px}

/* --- layout --------------------------------------------------------------- */
.shell{
  width:100%;
  max-width:var(--shell);
  margin:0 auto;
  padding:0 var(--gutter);
}
.blueprint{
  background-image:
    linear-gradient(to right,var(--grid-line) 1px,transparent 1px),
    linear-gradient(to bottom,var(--grid-line) 1px,transparent 1px);
  background-size:48px 48px;
}
.band{padding:64px 0}
.band--tight{padding:40px 0}
.band-light{background:var(--cream);color:var(--navy)}
.band-light h1,.band-light h2,.band-light h3,.band-light h4{color:var(--navy)}
.band-light .idx{color:var(--cyan-ink)}
.band-light .mono{color:rgba(10,37,64,.55)}
@media (max-width:640px){.band{padding:44px 0}.band--tight{padding:28px 0}}

.grid-12{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:24px;
}
.span-3{grid-column:span 3}
.span-4{grid-column:span 4}
.span-5{grid-column:span 5}
.span-6{grid-column:span 6}
.span-7{grid-column:span 7}
.span-8{grid-column:span 8}
.span-9{grid-column:span 9}
.span-12{grid-column:span 12}
@media (max-width:1024px){
  .span-3,.span-4,.span-5{grid-column:span 6}
  .span-6,.span-7,.span-8,.span-9{grid-column:span 12}
  .grid-12{gap:20px}
}
@media (max-width:640px){
  .span-3,.span-4,.span-5,.span-6,.span-7,.span-8,.span-9{grid-column:span 12}
  .grid-12{gap:16px}
}
.stack > * + *{margin-top:16px}
.stack--lg > * + *{margin-top:28px}
.cluster{display:flex;flex-wrap:wrap;align-items:center;gap:12px}

/* --- section head / index ------------------------------------------------- */
.idx{
  display:inline-flex;
  align-items:center;
  gap:9px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--cyan);
}
.idx::before{
  content:"";
  width:18px;
  height:1px;
  background:currentColor;
  opacity:.8;
}
.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:14px 24px;
  padding-bottom:16px;
  margin-bottom:28px;
  border-bottom:1px solid var(--line);
}
.section-head__title{
  font-size:clamp(24px,3vw,34px);
  font-weight:900;
}
.band-light .section-head{border-bottom-color:rgba(10,37,64,.16)}

/* --- buttons -------------------------------------------------------------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:12px 22px;
  border:1px solid transparent;
  border-radius:3px;
  font-family:var(--font-display);
  font-weight:700;
  font-size:15px;
  letter-spacing:.01em;
  text-decoration:none;
  transition:background-color var(--dur) var(--ease),
             color var(--dur) var(--ease),
             border-color var(--dur) var(--ease),
             transform var(--dur) var(--ease);
}
.btn:hover{transform:translateY(-2px)}
.btn:active{transform:translateY(0)}
.btn--primary{background:var(--orange);color:#2A0F04}
.btn--primary:hover{background:#FF9268}
.btn--cyan{background:var(--cyan);color:var(--navy-deep)}
.btn--cyan:hover{background:#4DF0DA}
.btn--ghost{border-color:var(--line);color:var(--mist)}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan)}
.band-light .btn--ghost{border-color:rgba(10,37,64,.3);color:var(--navy)}
.band-light .btn--ghost:hover{border-color:var(--cyan-ink);color:var(--cyan-ink)}

/* --- crumbs --------------------------------------------------------------- */
.crumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:rgba(215,225,234,.55);
}
.crumbs a{color:var(--cyan);transition:color var(--dur) var(--ease)}
.crumbs a:hover{color:var(--white)}
.crumbs__sep{opacity:.5}

/* --- prose ---------------------------------------------------------------- */
.prose{max-width:68ch}
.prose > * + *{margin-top:1.05em}
.prose h2{font-size:clamp(24px,2.7vw,32px);font-weight:900;margin-top:1.8em}
.prose h3{font-size:clamp(18px,2vw,21px);margin-top:1.5em}
.prose p,.prose li{color:rgba(215,225,234,.9)}
.prose ul,.prose ol{padding-left:1.35em}
.prose ul{list-style:square}
.prose ol{list-style:decimal}
.prose li + li{margin-top:.45em}
.prose a{color:var(--cyan);text-decoration:underline;text-underline-offset:3px}
.prose strong{color:var(--white)}
.prose code{
  font-family:var(--font-mono);
  font-size:.86em;
  padding:1px 6px;
  border:1px solid rgba(0,229,199,.2);
  border-radius:3px;
  background:rgba(0,229,199,.08);
  color:var(--cyan);
}
.band-light .prose p,.band-light .prose li{color:#22384D}
.band-light .prose strong{color:var(--navy)}
.band-light .prose a{color:var(--cyan-ink)}
.band-light .prose code{color:#065A51;background:rgba(3,137,123,.09);border-color:rgba(3,137,123,.24)}

/* --- panels --------------------------------------------------------------- */
.panel{
  position:relative;
  background:var(--navy-deep);
  border:1px solid var(--line);
  border-radius:4px;
  padding:24px;
  transition:border-color var(--dur) var(--ease),
             transform var(--dur) var(--ease),
             box-shadow var(--dur) var(--ease);
}
.panel:hover{border-color:var(--line-cyan);transform:translateY(-2px)}
.panel--cut{
  clip-path:polygon(
    var(--cut) 0,100% 0,
    100% calc(100% - var(--cut)),
    calc(100% - var(--cut)) 100%,
    0 100%,0 var(--cut)
  );
  border-radius:0;
}
.panel--cream{
  background:var(--cream);
  border-color:rgba(10,37,64,.14);
  color:var(--navy);
}
.panel--cream h2,.panel--cream h3{color:var(--navy)}

/* --- tags ----------------------------------------------------------------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 11px;
  border:1px solid var(--line);
  border-radius:999px;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--mist);
}
.tag--cyan{border-color:rgba(0,229,199,.5);color:var(--cyan)}
.tag--orange{border-color:rgba(255,122,69,.55);color:var(--orange)}
.tag--violet{border-color:rgba(124,92,255,.6);color:#AE99FF}
.tag--moss{border-color:rgba(94,122,90,.85);color:#A6C79F}

/* --- media ---------------------------------------------------------------- */
.media{
  position:relative;
  width:100%;
  aspect-ratio:16 / 10;
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:4px;
  background:linear-gradient(135deg,#0B2036 0%,#061729 64%);
}
.media::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:
    linear-gradient(to right,rgba(0,229,199,.09) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(0,229,199,.09) 1px,transparent 1px);
  background-size:40px 40px;
}
.media::after{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(115deg,transparent 42%,rgba(255,122,69,.22) 50%,transparent 58%);
}
.media > img,
.media > picture > img{
  position:relative;
  z-index:2;
  width:100%;
  height:100%;
  object-fit:cover;
}
.media--wide{aspect-ratio:21 / 9}
.media--square{aspect-ratio:1 / 1}
.media--tall{aspect-ratio:3 / 4}
.media__cap{
  position:absolute;
  z-index:3;
  left:14px;
  right:14px;
  bottom:12px;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.13em;
  text-transform:uppercase;
  color:var(--mist);
  text-shadow:0 1px 6px rgba(3,10,18,.85);
}

/* --- reveal (由页面阶段加 data-reveal) ------------------------------------ */
html[data-reveal-ready] [data-reveal]{
  opacity:0;
  transform:translateY(14px);
  transition:opacity 320ms var(--ease),transform 320ms var(--ease);
}
html[data-reveal-ready] [data-reveal].is-revealed{
  opacity:1;
  transform:none;
}

/* ==========================================================================
   页头：分置式索引带
   ========================================================================== */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:var(--navy);
  border-bottom:1px solid var(--line-cyan);
  box-shadow:0 1px 0 rgba(6,23,41,.7);
}
.header-shell{
  display:flex;
  align-items:center;
  gap:18px;
  min-height:64px;
  padding-top:8px;
  padding-bottom:8px;
}

.brand-lockup{
  display:flex;
  align-items:center;
  gap:16px;
  margin-right:auto;
  min-width:0;
}
.brand{
  display:flex;
  align-items:center;
  gap:10px;
  color:var(--white);
  min-width:0;
}
.brand__glyph{
  display:grid;
  place-items:center;
  flex:0 0 auto;
  width:34px;
  height:34px;
  font-family:var(--font-mono);
  font-size:13px;
  font-weight:700;
  letter-spacing:.06em;
  color:var(--navy-deep);
  background:var(--cyan);
  clip-path:polygon(0 0,100% 0,100% 68%,68% 100%,0 100%);
  transition:background-color var(--dur) var(--ease);
}
.brand:hover .brand__glyph{background:#4DF0DA}
.brand__text{display:flex;flex-direction:column;line-height:1.1;min-width:0}
.brand__name{
  font-family:var(--font-display);
  font-weight:900;
  font-size:17px;
  letter-spacing:.01em;
  white-space:nowrap;
}
.brand__sub{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.16em;
  color:rgba(215,225,234,.55);
  white-space:nowrap;
}

.coord{
  display:none;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  color:rgba(215,225,234,.45);
  white-space:nowrap;
}
.coord__v{color:var(--cyan)}
.coord__sep{width:1px;height:12px;background:var(--line)}

.nav-toggle{
  display:inline-flex;
  align-items:center;
  gap:9px;
  flex:0 0 auto;
  padding:8px 13px;
  border:1px solid var(--line);
  border-radius:3px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--mist);
  transition:border-color var(--dur) var(--ease),color var(--dur) var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle__ico{display:grid;gap:3px;width:14px}
.nav-toggle__ico i{
  display:block;
  height:1.5px;
  background:currentColor;
  border-radius:2px;
  transition:transform var(--dur) var(--ease),opacity var(--dur) var(--ease);
}
.nav-toggle[data-open="true"]{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle[data-open="true"] .nav-toggle__ico i:nth-child(1){transform:translateY(4.5px) rotate(45deg)}
.nav-toggle[data-open="true"] .nav-toggle__ico i:nth-child(2){opacity:0}
.nav-toggle[data-open="true"] .nav-toggle__ico i:nth-child(3){transform:translateY(-4.5px) rotate(-45deg)}
.nav-toggle__tx{white-space:nowrap}

/* 导航：窄屏下拉板 */
.site-nav{
  position:absolute;
  top:100%;
  left:0;
  right:0;
  z-index:6;
  display:none;
  max-height:min(72vh,520px);
  overflow-y:auto;
  padding:10px 20px 18px;
  background:var(--navy-deep);
  border-bottom:1px solid var(--line-cyan);
  box-shadow:0 20px 42px rgba(3,10,18,.62);
}
.site-nav[data-open="true"]{display:block}
.site-nav__list{display:flex;flex-direction:column}
.site-nav__item{border-bottom:1px solid rgba(60,74,87,.45)}
.site-nav__item:last-child{border-bottom:0}
.site-nav__link{
  position:relative;
  display:block;
  padding:13px 4px 13px 18px;
  font-size:15.5px;
  color:rgba(215,225,234,.86);
  transition:color var(--dur) var(--ease),background-color var(--dur) var(--ease);
}
.site-nav__link::before{
  content:"";
  position:absolute;
  left:0;
  top:50%;
  width:7px;
  height:7px;
  margin-top:-3.5px;
  border:1px solid var(--rock);
  transform:rotate(45deg);
  transition:border-color var(--dur) var(--ease),background-color var(--dur) var(--ease);
}
.site-nav__link:hover{color:var(--white)}
.site-nav__link:hover::before{border-color:var(--cyan)}
.site-nav__link[aria-current="page"]{color:var(--cyan)}
.site-nav__link[aria-current="page"]::before{background:var(--cyan);border-color:var(--cyan)}

.scroll-meter{
  position:absolute;
  left:0;
  right:0;
  bottom:-1px;
  height:2px;
  overflow:hidden;
  pointer-events:none;
}
.scroll-meter__bar{
  display:block;
  width:100%;
  height:100%;
  background:linear-gradient(90deg,var(--cyan) 0%,var(--violet) 55%,var(--orange) 100%);
  transform:scaleX(0);
  transform-origin:0 50%;
}

/* 桌面：索引带横置并左右渐隐 */
@media (min-width:901px){
  .coord{display:inline-flex}
  .nav-toggle{display:none}
  .site-nav{
    position:static;
    display:block;
    max-height:none;
    overflow:visible;
    padding:0;
    background:none;
    border:0;
    box-shadow:none;
  }
  .site-nav__list{
    flex-direction:row;
    align-items:center;
    gap:2px;
    overflow-x:auto;
    padding:2px 0;
    scrollbar-width:none;
    -ms-overflow-style:none;
    -webkit-mask-image:linear-gradient(to right,transparent 0,#000 16px,#000 calc(100% - 16px),transparent 100%);
    mask-image:linear-gradient(to right,transparent 0,#000 16px,#000 calc(100% - 16px),transparent 100%);
  }
  .site-nav__list::-webkit-scrollbar{display:none}
  .site-nav__item{border-bottom:0}
  .site-nav__link{
    display:inline-block;
    padding:9px 14px 9px 22px;
    font-size:14.5px;
    white-space:nowrap;
    border-radius:3px;
  }
  .site-nav__link:hover{background:rgba(0,229,199,.06)}
  .site-nav__link::after{
    content:"";
    position:absolute;
    left:22px;
    right:14px;
    bottom:3px;
    height:2px;
    background:var(--cyan);
    transform:scaleX(0);
    transform-origin:left center;
    transition:transform 240ms var(--ease);
  }
  .site-nav__link:hover::after{transform:scaleX(.5)}
  .site-nav__link[aria-current="page"]::after{transform:scaleX(1)}
}

@media (max-width:640px){
  .brand__sub{display:none}
  .brand__glyph{width:30px;height:30px;font-size:12px}
  .brand__name{font-size:16px}
  .header-shell{min-height:58px;padding-top:6px;padding-bottom:6px}
  .nav-toggle__tx{display:none}
  .nav-toggle{padding:9px 11px}
}

/* ==========================================================================
   页脚：四段式蓝图底板
   ========================================================================== */
.site-footer{
  position:relative;
  color:var(--mist);
  background-color:var(--navy-deep);
  border-top:1px solid var(--line-cyan);
  background-image:
    linear-gradient(to right,rgba(60,74,87,.24) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(60,74,87,.24) 1px,transparent 1px);
  background-size:44px 44px;
}
.site-footer::before{
  content:"";
  position:absolute;
  top:0;
  left:0;
  width:100%;
  height:3px;
  background:linear-gradient(90deg,var(--cyan) 0%,var(--violet) 48%,var(--orange) 100%);
}
.footer-grid{
  display:grid;
  grid-template-columns:1.55fr 1fr 1.4fr 1fr;
  gap:36px 28px;
  padding:52px 0 40px;
}
.footer-col{min-width:0}
.footer-title{
  margin-bottom:14px;
  padding-bottom:10px;
  border-bottom:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--cyan);
}
.footer-brand{
  font-family:var(--font-display);
  font-weight:900;
  font-size:21px;
  line-height:1.2;
  color:var(--white);
}
.footer-lead{
  margin-top:12px;
  max-width:34ch;
  font-size:14.5px;
  line-height:1.8;
  color:rgba(215,225,234,.8);
}
.footer-coord{
  margin-top:16px;
  color:rgba(215,225,234,.45);
}
.footer-list{display:grid;gap:10px}
.footer-link{
  display:inline-flex;
  align-items:center;
  gap:9px;
  font-size:14.5px;
  color:var(--mist);
  transition:color var(--dur) var(--ease);
}
.footer-link::before{
  content:"";
  width:10px;
  height:1px;
  background:rgba(215,225,234,.4);
  transition:width var(--dur) var(--ease),background-color var(--dur) var(--ease);
}
.footer-link:hover{color:var(--cyan)}
.footer-link:hover::before{width:18px;background:var(--cyan)}

.footer-list--contact{gap:13px}
.footer-list--contact li{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:9px;
  font-size:14.5px;
}
.footer-k{
  flex:0 0 auto;
  min-width:66px;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:rgba(215,225,234,.5);
}
.footer-v{
  color:var(--white);
  word-break:break-all;
}
.footer-hint{
  display:block;
  flex-basis:100%;
  font-size:13px;
  line-height:1.75;
  color:rgba(215,225,234,.62);
}
.copy-btn{
  flex:0 0 auto;
  padding:3px 10px;
  border:1px solid var(--line);
  border-radius:2px;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.14em;
  color:var(--mist);
  transition:border-color var(--dur) var(--ease),
             color var(--dur) var(--ease),
             background-color var(--dur) var(--ease);
}
.copy-btn:hover{border-color:var(--cyan);color:var(--cyan)}
.copy-btn.is-done{
  border-color:var(--moss);
  color:#A6C79F;
  background:rgba(94,122,90,.18);
}
.footer-icp{
  margin-top:16px;
  font-size:11px;
  letter-spacing:.12em;
  color:rgba(215,225,234,.5);
  text-transform:none;
}
.footer-base{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 24px;
  padding-top:18px;
  padding-bottom:26px;
  border-top:1px solid var(--line);
  color:rgba(215,225,234,.5);
  text-transform:none;
}

@media (max-width:1024px){
  .footer-grid{grid-template-columns:1fr 1fr;gap:34px 24px;padding:44px 0 34px}
}
@media (max-width:600px){
  .footer-grid{grid-template-columns:1fr;padding:34px 0 26px}
  .footer-base{justify-content:flex-start;padding-bottom:22px}
}

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