/* ==========================================================================
   金博主站 · 共享样式 /assets/site.css
   侧轨 + 顶框围成画框 · 精密网格 · 深海藏蓝 / 暖白象牙 / 鎏金暖橙
   ========================================================================== */

/* ------------------------------------------------------------------ 1 变量 */
:root{
  --navy:#0B1B2B;
  --navy-mid:#12304A;
  --ivory:#F5F1E8;
  --white:#FFFFFF;
  --gold:#E8A33D;
  --gold-light:#F2C879;
  --gold-ink:#7A4C0C;
  --jade:#0FB5A6;
  --jade-ink:#0A6E66;
  --coral:#E4572E;
  --coral-ink:#A6360F;
  --graphite:#6B7A8F;
  --ink:#1E2A38;
  --ink-soft:#41505F;
  --line:rgba(107,122,143,.28);
  --line-strong:rgba(107,122,143,.46);
  --line-dark:rgba(107,122,143,.34);
  --rail-w:88px;
  --frame-h:56px;
  --maxw:1320px;
  --pad:clamp(20px,4vw,72px);
  --gap:clamp(16px,1.8vw,28px);
  --ease:cubic-bezier(.22,.61,.36,1);
  --t-fast:140ms;
  --t:220ms;
  --font-display:'Alibaba PuHuiTi 3.0','Source Han Sans SC','Noto Sans SC','PingFang SC','HarmonyOS Sans SC','Microsoft YaHei',sans-serif;
  --font-body:'HarmonyOS Sans SC','Source Han Sans SC','PingFang SC','Noto Sans SC','Microsoft YaHei',sans-serif;
  --font-mono:'JetBrains Mono','Roboto Mono',SFMono-Regular,Menlo,Consolas,monospace;
}
@media (min-width:1280px){:root{--rail-w:104px;}}

/* ------------------------------------------------------------------ 2 Reset */
*,*::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;}
img,picture,svg,video{display:block;max-width:100%;}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer;}
a{color:inherit;text-decoration:none;}
table{border-collapse:collapse;width:100%;}
input,select,textarea{font:inherit;}

/* -------------------------------------------------------------- 3 基础排版 */
body{
  font-family:var(--font-body);
  font-size:1rem;
  line-height:1.8;
  color:var(--ink);
  background:var(--ivory);
  padding-left:var(--rail-w);
  padding-top:var(--frame-h);
  min-height:100vh;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
@media (min-width:1080px){body{font-size:1.0625rem;}}
main{display:block;}
#main-content{display:block;}
[id]{scroll-margin-top:calc(var(--frame-h) + 20px);}
p{max-width:38ch;}
::selection{background:var(--gold-light);color:var(--navy);}

.display{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(2.75rem,7vw,6rem);
  line-height:1.02;
  letter-spacing:-.02em;
  color:var(--ink);
}
.section-title{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(1.5rem,3vw,2.5rem);
  line-height:1.18;
  letter-spacing:-.01em;
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:.75rem;
  font-weight:600;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--graphite);
}
.eyebrow::before{content:'';width:18px;height:2px;background:var(--gold);flex:none;}
.eyebrow--light{color:#9FB0C4;}
.lede{font-size:1.0625rem;line-height:1.85;color:var(--ink-soft);max-width:34ch;}
.mono{font-family:var(--font-mono);letter-spacing:.04em;}

.sr-only{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;border:0;
}
:focus-visible{outline:2px solid var(--gold-light);outline-offset:2px;}

/* -------------------------------------------------------- 4 容器 / 分区 / 网格 */
.wrap{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:var(--pad);
}
.section{padding-block:clamp(56px,7vw,104px);}
.section--ivory{background:var(--ivory);}
.section--white{background:var(--white);}
.section--navy{background:var(--navy);color:#D8E0EA;}
.section--navy .display,.section--navy .section-title{color:var(--white);}
.section--navy .lede,.section--navy p{color:#B9C4D2;}
.section--mid{background:var(--navy-mid);color:#D8E0EA;}
.section--mid .section-title{color:var(--white);}
.section--mid .lede,.section--mid p{color:#BEC9D6;}

.hairgrid{position:relative;}
.hairgrid::before{
  content:'';position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(90deg,var(--line) 1px,transparent 1px);
  background-size:calc(100% / 12) 100%;
  opacity:.75;
}

.grid12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:var(--gap);}
.span-3,.span-4,.span-5,.span-6,.span-7,.span-8,.span-12{grid-column:span 12;}
@media (min-width:768px){
  .span-3,.span-4,.span-5,.span-6{grid-column:span 6;}
}
@media (min-width:1080px){
  .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;}
}

/* ------------------------------------------------------------------ 5 按钮 */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-family:var(--font-body);font-weight:700;font-size:.9375rem;line-height:1;
  letter-spacing:.02em;padding:12px 20px;border:1px solid transparent;border-radius:0;
  transition:background var(--t) var(--ease),color var(--t) var(--ease),
             border-color var(--t) var(--ease),transform var(--t) var(--ease);
}
.btn:hover{transform:translateY(-2px);}
.btn:active{transform:translateY(0);}
.btn--gold{background:var(--gold);color:#2A1B04;border-color:var(--gold);}
.btn--gold:hover{background:var(--gold-light);border-color:var(--gold-light);}
.btn--ghost{background:transparent;color:var(--gold-light);border-color:rgba(242,200,121,.55);}
.btn--ghost:hover{background:rgba(232,163,61,.12);color:var(--white);}
.btn--jade{background:transparent;color:var(--jade);border-color:rgba(15,181,166,.5);}
.btn--jade:hover{background:rgba(15,181,166,.12);}
.btn--sm{padding:8px 14px;font-size:.8125rem;}

/* ------------------------------------------------------------------ 6 标签 */
.tag{
  display:inline-block;font-family:var(--font-mono);font-size:.6875rem;
  letter-spacing:.1em;line-height:1.6;padding:3px 8px;border:1px solid transparent;
}
.tag--gold{color:var(--gold-ink);border-color:rgba(232,163,61,.6);background:rgba(242,200,121,.26);}
.tag--jade{color:var(--jade-ink);border-color:rgba(15,181,166,.55);background:rgba(15,181,166,.14);}
.tag--coral{color:var(--coral-ink);border-color:rgba(228,87,46,.5);background:rgba(228,87,46,.12);}
.tag--navy{color:var(--gold-light);border-color:rgba(242,200,121,.5);background:rgba(232,163,61,.14);}

/* ------------------------------------------------------------ 7 块面 / 图片 */
.panel{
  background:var(--white);
  border:1px solid var(--line);
  border-left:3px solid var(--gold);
  padding:clamp(20px,2.4vw,32px);
  transition:border-color var(--t) var(--ease),transform var(--t) var(--ease);
}
.panel:hover{border-color:var(--line-strong);transform:translateY(-4px);}
.panel--dark{background:rgba(18,48,74,.62);border-color:var(--line-dark);color:#D8E0EA;}

.media{
  position:relative;overflow:hidden;aspect-ratio:16 / 9;
  background:var(--navy-mid);
  border:1px solid var(--line-strong);
}
.media > img,.media > picture > img{width:100%;height:100%;object-fit:cover;}
.media::after{
  content:'';position:absolute;inset:8px;pointer-events:none;
  border:1px solid rgba(242,200,121,.24);
}
.media--wide{aspect-ratio:21 / 9;}
.media--tall{aspect-ratio:4 / 5;}
.media--square{aspect-ratio:1 / 1;}
.media--pending{
  background-image:
    repeating-linear-gradient(45deg,rgba(15,181,166,.08) 0 10px,transparent 10px 20px),
    linear-gradient(180deg,var(--navy-mid),var(--navy));
}
.media__cap{
  position:absolute;left:0;bottom:0;z-index:2;
  background:rgba(11,27,43,.8);color:var(--gold-light);
  font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.08em;
  padding:6px 12px;
}

/* --------------------------------------------------- 8 章节索引（页面阶段可选） */
.section-nav{display:flex;flex-wrap:wrap;gap:8px;padding-block:12px;}
.section-nav a{
  font-family:var(--font-mono);font-size:.75rem;letter-spacing:.06em;
  color:var(--graphite);padding:6px 10px;border:1px solid var(--line);
  transition:color var(--t) var(--ease),border-color var(--t) var(--ease),background var(--t) var(--ease);
}
.section-nav a:hover{color:var(--gold-ink);border-color:rgba(232,163,61,.6);background:rgba(242,200,121,.2);}
.section-nav a[aria-current]{color:var(--navy);background:var(--gold);border-color:var(--gold);}

/* --------------------------------------------------------------- 9 跳转链接 */
.skip-link{
  position:fixed;top:8px;left:calc(var(--rail-w) + 8px);z-index:200;
  transform:translateY(-200%);background:var(--gold);color:var(--navy);
  font-size:.875rem;font-weight:800;padding:10px 16px;
  transition:transform var(--t) var(--ease);
}
.skip-link:focus{transform:translateY(0);}

/* ----------------------------------------------------------- 10 头部 · 侧轨 */
.site-header{position:relative;z-index:60;}

.site-rail{
  position:fixed;top:0;left:0;bottom:0;width:var(--rail-w);z-index:70;
  display:flex;flex-direction:column;
  padding:16px 0 14px;
  color:#C6CFDB;
  border-right:1px solid var(--line-dark);
  background-image:
    repeating-linear-gradient(180deg,rgba(107,122,143,.13) 0 1px,transparent 1px 48px),
    linear-gradient(180deg,#0B1B2B 0%,#0D2135 58%,#0B1B2B 100%);
}
.rail__brand{
  display:flex;flex-direction:column;align-items:center;gap:8px;
  padding:4px 8px 18px;border-bottom:1px solid var(--line-dark);
}
.rail__mark{
  font-family:var(--font-display);font-weight:900;font-size:1.25rem;
  letter-spacing:.06em;line-height:1;color:var(--gold);
}
.rail__sub{
  font-family:var(--font-mono);font-size:.5625rem;letter-spacing:.16em;
  text-transform:uppercase;color:var(--graphite);
}
.rail__close{
  display:none;position:absolute;top:10px;right:10px;z-index:2;
  width:36px;height:36px;align-items:center;justify-content:center;
  border:1px solid var(--line-strong);color:var(--gold-light);
  font-size:.875rem;line-height:1;background:rgba(11,27,43,.5);
}
.rail__nav{
  flex:1 1 auto;overflow-y:auto;overflow-x:hidden;
  margin-top:14px;padding:0 6px;
}
.nav-list{display:flex;flex-direction:column;gap:4px;}
.nav-link{
  position:relative;display:flex;flex-direction:column;align-items:center;gap:2px;
  padding:10px 4px;border:1px solid transparent;color:#C6CFDB;
  transition:color var(--t) var(--ease),background var(--t) var(--ease),border-color var(--t) var(--ease);
}
.nav-link:hover{color:var(--gold-light);background:rgba(232,163,61,.08);border-color:rgba(232,163,61,.28);}
.nav-link[aria-current="page"]{
  color:var(--gold);background:rgba(232,163,61,.12);border-color:rgba(232,163,61,.45);
}
.nav-link[aria-current="page"]::before{
  content:'';position:absolute;left:-7px;top:50%;transform:translateY(-50%);
  width:3px;height:26px;background:var(--gold);
}
.nav-idx{font-family:var(--font-mono);font-size:.625rem;letter-spacing:.1em;color:var(--graphite);}
.nav-link[aria-current="page"] .nav-idx{color:var(--gold-light);}
.nav-label{font-size:.8125rem;font-weight:600;letter-spacing:.04em;line-height:1.3;text-align:center;}
.rail__meta{padding:14px 8px 0;border-top:1px solid var(--line-dark);text-align:center;}
.rail__status{display:flex;align-items:center;justify-content:center;gap:6px;max-width:none;}
.rail__dot{
  width:6px;height:6px;flex:none;background:var(--jade);
  animation:railPulse 2.4s ease-in-out infinite;
}
@keyframes railPulse{0%,100%{opacity:1;}50%{opacity:.35;}}
.rail__ver{font-family:var(--font-mono);font-size:.75rem;letter-spacing:.12em;color:var(--gold-light);}
.rail__note{
  margin-top:6px;font-size:.625rem;letter-spacing:.04em;color:var(--graphite);
  max-width:none;line-height:1.5;
}

/* --------------------------------------------------------- 11 头部 · 框架栏 */
.site-frame{
  position:fixed;top:0;left:var(--rail-w);right:0;height:var(--frame-h);z-index:60;
  display:flex;align-items:center;justify-content:space-between;gap:14px;
  padding-inline:clamp(14px,2vw,28px);
  border-bottom:1px solid rgba(232,163,61,.38);
  background-image:linear-gradient(90deg,#0B1B2B 0%,#12304A 68%,#0B1B2B 100%);
}
.frame__progress{
  position:absolute;left:0;bottom:0;width:100%;height:2px;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--gold),var(--gold-light));
}
.crumbs{display:flex;align-items:center;gap:10px;min-width:0;font-size:.8125rem;color:#B9C4D2;}
.crumbs__coord{
  font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.1em;
  color:var(--jade);border:1px solid rgba(15,181,166,.42);padding:2px 6px;white-space:nowrap;
}
.crumbs__link{color:#B9C4D2;transition:color var(--t) var(--ease);white-space:nowrap;}
.crumbs__link:hover{color:var(--gold-light);}
.crumbs__sep{color:var(--graphite);}
.crumbs__current{
  color:var(--gold-light);font-weight:600;white-space:nowrap;
  overflow:hidden;text-overflow:ellipsis;
}
.frame__actions{display:flex;align-items:center;gap:12px;}
.frame__hint{
  font-size:.75rem;color:var(--graphite);white-space:nowrap;
  padding-right:12px;border-right:1px solid var(--line-strong);
}
.nav-toggle{
  display:none;width:40px;height:40px;align-items:center;justify-content:center;
  border:1px solid var(--line-strong);color:var(--gold-light);
}
.nav-toggle__bars{position:relative;display:block;width:18px;height:2px;background:currentColor;transition:background var(--t) var(--ease);}
.nav-toggle__bars::before,.nav-toggle__bars::after{
  content:'';position:absolute;left:0;width:18px;height:2px;background:currentColor;
  transition:transform var(--t) var(--ease);
}
.nav-toggle__bars::before{top:-6px;}
.nav-toggle__bars::after{top:6px;}
.site-header[data-open] .nav-toggle__bars{background:transparent;}
.site-header[data-open] .nav-toggle__bars::before{transform:translateY(6px) rotate(45deg);}
.site-header[data-open] .nav-toggle__bars::after{transform:translateY(-6px) rotate(-45deg);}
.nav-scrim{
  position:fixed;inset:0;z-index:65;background:rgba(11,27,43,.62);
  opacity:0;visibility:hidden;
  transition:opacity var(--t) var(--ease),visibility var(--t) linear;
}

/* ------------------------------------------------------------- 12 移动 / 平板 */
@media (max-width:1079px){
  body{padding-left:0;}
  .site-rail{
    width:min(300px,84vw);
    transform:translateX(-102%);
    transition:transform var(--t) var(--ease);
    box-shadow:10px 0 28px rgba(11,27,43,.4);
  }
  .site-header[data-open] .site-rail{transform:translateX(0);}
  .site-header[data-open] .nav-scrim{opacity:1;visibility:visible;}
  .site-frame{left:0;}
  .nav-toggle{display:flex;}
  .rail__close{display:flex;}
  .rail__brand{align-items:flex-start;padding-left:16px;}
  .rail__nav{padding:0 10px;}
  .nav-link{flex-direction:row;align-items:center;justify-content:flex-start;gap:12px;padding:12px;}
  .nav-label{font-size:.9375rem;text-align:left;}
  .nav-link[aria-current="page"]::before{left:-10px;}
  .rail__meta{text-align:left;padding-inline:16px;}
  .rail__status{justify-content:flex-start;}
  .frame__hint{display:none;}
  .skip-link{left:8px;}
}
@media (min-width:1080px){
  .nav-scrim{display:none;}
}

/* -------------------------------------------------------------- 13 页脚 */
.site-footer{
  position:relative;
  color:#C6CFDB;
  font-size:.875rem;
  line-height:1.75;
  border-top:1px solid rgba(232,163,61,.38);
  background-color:var(--navy);
  background-image:
    linear-gradient(180deg,rgba(18,48,74,.6),rgba(11,27,43,0) 46%),
    repeating-linear-gradient(90deg,rgba(107,122,143,.13) 0 1px,transparent 1px 96px);
}
.footer__grid{
  display:grid;
  grid-template-columns:1.3fr 1fr 1.5fr 1fr;
  gap:clamp(20px,3vw,48px);
  padding-block:clamp(40px,5vw,64px) clamp(28px,3vw,40px);
}
@media (max-width:1079px){
  .footer__grid{grid-template-columns:1fr 1fr;}
}
@media (max-width:679px){
  .footer__grid{grid-template-columns:1fr;}
}
.footer__brand,.footer__col{align-self:start;}
.footer__mark{
  font-family:var(--font-display);font-weight:900;font-size:1.375rem;
  letter-spacing:.04em;line-height:1.2;color:var(--white);max-width:none;
}
.footer__tag{
  margin-top:8px;font-family:var(--font-mono);font-size:.75rem;
  letter-spacing:.1em;color:var(--gold-light);max-width:none;
}
.footer__note{margin-top:10px;color:#9FB0C4;max-width:34ch;}
.footer__note + .footer__note{margin-top:8px;}
.footer__title{
  font-family:var(--font-mono);font-size:.75rem;font-weight:600;
  letter-spacing:.14em;color:var(--gold);margin-bottom:12px;max-width:none;
}
.footer__list{display:flex;flex-direction:column;gap:8px;}
.footer__list--mono .footer__text{font-family:var(--font-mono);letter-spacing:.02em;}
.footer__link{
  color:#C6CFDB;border-bottom:1px solid transparent;
  transition:color var(--t) var(--ease),border-color var(--t) var(--ease);
}
.footer__link:hover{color:var(--gold-light);border-bottom-color:var(--gold-light);}
.footer__link--strong{font-weight:700;color:var(--gold-light);}
.footer__text{color:#9FB0C4;max-width:34ch;word-break:break-word;}
.footer__text--mono{font-family:var(--font-mono);letter-spacing:.04em;white-space:nowrap;}
.footer__legal{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:12px;padding-block:18px;border-top:1px solid var(--line-dark);color:#8FA0B4;
}
.footer__copy{max-width:none;}

/* --------------------------------------------------------- 14 显现动效 */
html.js [data-reveal]{
  opacity:0;transform:translateY(12px);
  transition:opacity 320ms var(--ease),transform 320ms var(--ease);
}
html.js [data-reveal].is-visible{opacity:1;transform:none;}

/* ----------------------------------------------------- 15 降低动效偏好 */
@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-behavior:auto !important;
  }
  .btn:hover,.panel:hover{transform:none;}
  html.js [data-reveal]{opacity:1;transform:none;}
  .rail__dot{animation:none;}
}