/* ==========================================================================
   得胜28 · 全站共享样式 /assets/site.css
   技术蓝图网格 + 深海蓝-熔岩橙双色体系
   ========================================================================== */

:root{
  --ink:#06182B;
  --blue:#0C3A5E;
  --blue-mid:#17557F;
  --rule:#8FB6D4;
  --mist:#EEF4F9;
  --white:#FFFFFF;
  --orange:#FF5A18;
  --orange-soft:#FFA46B;
  --celadon:#35C0A0;
  --celadon-deep:#1E8C74;
  --graphite:#22303D;
  --cool:#6B7C8C;

  --rule-soft:rgba(143,182,212,.28);
  --rule-dark:rgba(143,182,212,.16);
  --rule-light:rgba(12,58,94,.14);

  --font-head:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-body:var(--font-head);
  --font-mono:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --wrap:1240px;
  --gut:clamp(16px,4vw,40px);
  --hdr-h:64px;
  --t:180ms cubic-bezier(.2,.7,.3,1);
  --t-slow:520ms cubic-bezier(.2,.7,.3,1);
}

*,*::before,*::after{box-sizing:border-box}

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

body{
  margin:0;
  background:var(--white);
  color:var(--graphite);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

main{display:block}

#main-content{
  outline:none;
  scroll-margin-top:calc(var(--hdr-h) + 16px);
}

img{max-width:100%;height:auto;display:block}
svg{max-width:100%}

a{color:var(--blue);text-decoration-thickness:1px;text-underline-offset:3px}

::selection{background:var(--orange);color:#fff}

h1,h2,h3,h4,h5{
  font-family:var(--font-head);
  letter-spacing:-.02em;
  line-height:1.15;
  margin:0 0 .6em;
  color:var(--ink);
}
h1{font-weight:900;font-size:clamp(30px,5.2vw,56px);line-height:1.08}
h2{font-weight:900;font-size:clamp(24px,3.4vw,40px)}
h3{font-weight:800;font-size:clamp(19px,2.2vw,28px)}
h4{font-weight:700;font-size:clamp(17px,1.6vw,22px)}
p{margin:0 0 1em}
p:last-child{margin-bottom:0}

:focus-visible{
  outline:2px solid var(--orange);
  outline-offset:2px;
  border-radius:1px;
}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:fixed;
  top:-120px;
  left:16px;
  z-index:999;
  padding:11px 18px;
  background:var(--orange);
  color:#fff;
  font:600 14px/1 var(--font-head);
  text-decoration:none;
  transition:top var(--t);
}
.skip-link:focus{top:12px;color:#fff}

/* ---------- 宽度容器 ---------- */
.wrap{
  width:100%;
  max-width:var(--wrap);
  margin:0 auto;
  padding:0 var(--gut);
}
.wrap--narrow{max-width:820px}

/* ==========================================================================
   页头 · 紧凑命令栏
   ========================================================================== */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background-color:var(--blue);
  background-image:
    linear-gradient(rgba(143,182,212,.11) 1px,transparent 1px),
    linear-gradient(90deg,rgba(143,182,212,.11) 1px,transparent 1px);
  background-size:32px 32px,32px 32px;
  border-bottom:1px solid rgba(143,182,212,.34);
  color:var(--mist);
}

.site-header__inner{
  position:relative;
  max-width:var(--wrap);
  margin:0 auto;
  padding:0 var(--gut);
  min-height:var(--hdr-h);
  display:flex;
  align-items:center;
  gap:clamp(10px,1.8vw,26px);
}

/* 品牌刻度块 */
.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  flex:none;
  text-decoration:none;
  color:inherit;
  padding:6px 0;
}
.brand__mark{
  width:30px;
  height:30px;
  flex:none;
  display:grid;
  place-items:center;
  background:var(--orange);
  color:#fff;
  font:900 12px/1 var(--font-mono);
  clip-path:polygon(0 0,100% 0,100% 68%,68% 100%,0 100%);
}
.brand__text{display:flex;flex-direction:column;gap:2px}
.brand__name{
  font:900 17px/1.05 var(--font-head);
  letter-spacing:-.02em;
  color:#fff;
}
.brand__tagline{
  font:400 11px/1.2 var(--font-head);
  letter-spacing:.04em;
  color:var(--rule);
  white-space:nowrap;
}

/* 栏目标签带 */
.nav{flex:1 1 auto;min-width:0}
.nav__list{
  list-style:none;
  margin:0;
  padding:0;
  display:flex;
  align-items:stretch;
  gap:2px;
  overflow-x:auto;
  scrollbar-width:none;
  -ms-overflow-style:none;
}
.nav__list::-webkit-scrollbar{display:none}
.nav__item{display:flex}

.nav__link{
  position:relative;
  display:flex;
  align-items:center;
  height:var(--hdr-h);
  padding:0 13px;
  font:500 14px/1 var(--font-head);
  letter-spacing:.01em;
  color:rgba(238,244,249,.84);
  text-decoration:none;
  white-space:nowrap;
  transition:color var(--t),background-color var(--t);
}
.nav__link:hover{color:#fff;background:rgba(143,182,212,.12)}

.nav__link::after{
  content:"";
  position:absolute;
  left:13px;
  right:13px;
  bottom:0;
  height:3px;
  background:var(--orange);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform var(--t);
}
.nav__link::before{
  content:"";
  position:absolute;
  left:13px;
  top:0;
  width:0;
  height:2px;
  background:var(--orange-soft);
  transition:width var(--t);
}
.nav__link[aria-current="page"]{color:#fff}
.nav__link[aria-current="page"]::after{transform:scaleX(1)}
.nav__link[aria-current="page"]::before{width:20px}

/* 头部动作入口 */
.header__actions{
  display:flex;
  align-items:center;
  gap:8px;
  flex:none;
  margin-left:auto;
}

/* 移动端开关 */
.nav-toggle{
  display:none;
  margin-left:auto;
  align-items:center;
  gap:9px;
  padding:9px 12px;
  background:transparent;
  border:0;
  box-shadow:inset 0 0 0 1px rgba(143,182,212,.55);
  color:var(--mist);
  font:600 12px/1 var(--font-head);
  letter-spacing:.1em;
  cursor:pointer;
  clip-path:polygon(0 0,calc(100% - 9px) 0,100% 9px,100% 100%,9px 100%,0 calc(100% - 9px));
  transition:background-color var(--t),color var(--t);
}
.nav-toggle:hover{background:rgba(143,182,212,.16);color:#fff}
.nav-toggle[aria-expanded="true"]{background:var(--orange);color:#fff;box-shadow:none}
.nav-toggle__bars{display:grid;gap:3px;width:16px}
.nav-toggle__bars i{display:block;height:2px;background:currentColor}
.nav-toggle__label{white-space:nowrap}

/* 滚动进度条 */
.header__progress{
  position:absolute;
  left:0;
  right:0;
  bottom:-1px;
  height:2px;
  background:rgba(143,182,212,.18);
  overflow:hidden;
}
.header__progress i{
  display:block;
  width:0;
  height:100%;
  background:linear-gradient(90deg,var(--celadon) 0%,var(--orange-soft) 45%,var(--orange) 100%);
}

/* ==========================================================================
   页脚 · 图纸签章区
   ========================================================================== */
.site-footer{
  position:relative;
  background-color:var(--ink);
  background-image:
    linear-gradient(rgba(143,182,212,.075) 1px,transparent 1px),
    linear-gradient(90deg,rgba(143,182,212,.075) 1px,transparent 1px);
  background-size:40px 40px,40px 40px;
  border-top:1px solid rgba(143,182,212,.34);
  color:var(--mist);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:0;
  left:0;
  width:clamp(80px,14vw,160px);
  height:3px;
  background:var(--orange);
}

.site-footer__inner{
  max-width:var(--wrap);
  margin:0 auto;
  padding:clamp(40px,6vw,72px) var(--gut) clamp(32px,4vw,52px);
  display:grid;
  grid-template-columns:minmax(0,1.15fr) minmax(0,1.45fr);
  gap:clamp(28px,5vw,64px);
  align-items:start;
}

.footer__logo{
  display:inline-flex;
  align-items:center;
  gap:10px;
  text-decoration:none;
  color:#fff;
}
.footer__logo-mark{
  width:28px;
  height:28px;
  flex:none;
  display:grid;
  place-items:center;
  background:var(--orange);
  color:#fff;
  font:900 11px/1 var(--font-mono);
  clip-path:polygon(0 0,100% 0,100% 68%,68% 100%,0 100%);
}
.footer__logo-text{
  font:900 18px/1 var(--font-head);
  letter-spacing:-.02em;
}
.footer__closing{
  margin:14px 0 0;
  max-width:34ch;
  font:400 14px/1.7 var(--font-head);
  color:rgba(238,244,249,.72);
}
.footer__meta{
  margin:22px 0 0;
  padding:0;
  display:grid;
  gap:10px;
}
.footer__meta-row{
  display:grid;
  grid-template-columns:76px minmax(0,1fr);
  gap:12px;
  align-items:baseline;
  border-top:1px dashed rgba(143,182,212,.26);
  padding-top:10px;
}
.footer__meta-row dt{
  font:600 11px/1.7 var(--font-head);
  letter-spacing:.12em;
  color:var(--rule);
}
.footer__meta-row dd{
  margin:0;
  font-size:13px;
  line-height:1.6;
  color:rgba(238,244,249,.9);
  overflow-wrap:anywhere;
}
.footer__note{
  margin:16px 0 0;
  max-width:44ch;
  font-size:12px;
  line-height:1.7;
  color:rgba(143,182,212,.82);
}

.footer__nav{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(16px,3vw,32px);
}
.footer__heading{
  margin:0 0 14px;
  padding-bottom:10px;
  border-bottom:1px solid rgba(143,182,212,.24);
  font:900 12px/1 var(--font-head);
  letter-spacing:.14em;
  color:var(--orange-soft);
}
.footer__list{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:11px;
}
.footer__link{
  display:inline-block;
  color:rgba(238,244,249,.82);
  font-size:14px;
  line-height:1.5;
  text-decoration:none;
  padding-bottom:2px;
  border-bottom:1px solid transparent;
  transition:color var(--t),border-color var(--t);
}
.footer__link:hover{color:#fff;border-bottom-color:var(--orange)}

.site-footer__base{
  border-top:1px solid rgba(143,182,212,.24);
  background:rgba(6,24,43,.62);
}
.site-footer__base-inner{
  max-width:var(--wrap);
  margin:0 auto;
  padding:18px var(--gut);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 24px;
}
.footer__copy{
  margin:0;
  font-size:12px;
  line-height:1.6;
  color:rgba(143,182,212,.9);
}
.footer__icp{
  margin:0;
  font-size:12px;
  line-height:1.6;
  letter-spacing:.04em;
  color:var(--rule);
}

/* ==========================================================================
   通用按钮
   ========================================================================== */
.btn{
  position:relative;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:12px 20px;
  border:0;
  cursor:pointer;
  font:600 14px/1 var(--font-head);
  letter-spacing:.02em;
  text-decoration:none;
  text-align:center;
  clip-path:polygon(0 0,calc(100% - 10px) 0,100% 10px,100% 100%,10px 100%,0 calc(100% - 10px));
  transition:background-color var(--t),color var(--t),box-shadow var(--t);
}
.btn:focus-visible{outline-offset:-4px;outline-color:currentColor}

.btn--accent{background:var(--orange);color:#fff}
.btn--accent:hover{background:var(--orange-soft);color:var(--ink)}

.btn--line{background:transparent;color:var(--mist);box-shadow:inset 0 0 0 1px rgba(143,182,212,.6)}
.btn--line:hover{background:rgba(143,182,212,.16);color:#fff}

.btn--dark{background:var(--blue);color:#fff}
.btn--dark:hover{background:var(--blue-mid)}

.btn--ghost{background:var(--white);color:var(--blue);box-shadow:inset 0 0 0 1px rgba(12,58,94,.22)}
.btn--ghost:hover{background:var(--mist)}

.btn--sm{padding:9px 14px;font-size:13px}

/* ==========================================================================
   基础组件
   ========================================================================== */
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:9px;
  font:600 12px/1 var(--font-mono);
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--cool);
  margin:0 0 14px;
}
.eyebrow::before{
  content:"";
  width:16px;
  height:2px;
  flex:none;
  background:var(--orange);
}

.mono{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-feature-settings:"tnum" 1;
}

.lede{
  font-size:clamp(16px,1.6vw,18px);
  line-height:1.75;
  color:var(--graphite);
  max-width:38ch;
}

.blueprint{
  background-image:
    linear-gradient(rgba(143,182,212,.14) 1px,transparent 1px),
    linear-gradient(90deg,rgba(143,182,212,.14) 1px,transparent 1px);
  background-size:32px 32px,32px 32px;
}

/* 章节 */
.section{padding:clamp(40px,6vw,80px) 0}
.section--tight{padding:clamp(26px,4vw,48px) 0}
.section--mist{background:var(--mist)}
.section--blue{background:var(--blue);color:var(--mist)}
.section--ink{background:var(--ink);color:var(--mist)}
.section--blue h1,.section--blue h2,.section--blue h3,.section--blue h4,
.section--ink h1,.section--ink h2,.section--ink h3,.section--ink h4{color:#fff}

/* 网格 */
.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}

/* 切角面板 */
.panel{
  position:relative;
  background:var(--white);
  color:var(--graphite);
  border:1px solid var(--rule-light);
  padding:clamp(18px,2.4vw,28px);
  clip-path:polygon(0 0,calc(100% - 18px) 0,100% 18px,100% 100%,18px 100%,0 calc(100% - 18px));
}
.panel--dark{background:var(--blue);color:var(--mist);border-color:rgba(143,182,212,.3)}
.panel--ink{background:var(--ink);color:var(--mist);border-color:rgba(143,182,212,.26)}
.panel--accent{background:linear-gradient(135deg,var(--blue) 0%,var(--blue-mid) 100%);color:#fff;border-color:transparent}
.panel--dark h1,.panel--dark h2,.panel--dark h3,.panel--dark h4,
.panel--ink h1,.panel--ink h2,.panel--ink h3,.panel--ink h4,
.panel--accent h1,.panel--accent h2,.panel--accent h3,.panel--accent h4{color:#fff}
.panel--dark p,.panel--ink p,.panel--accent p{color:rgba(238,244,249,.86)}

/* 大号数值 */
.metric{display:flex;flex-direction:column;gap:6px}
.metric__num{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-weight:900;
  font-size:clamp(32px,4.6vw,64px);
  line-height:1;
  letter-spacing:-.03em;
  color:var(--orange);
}
.metric__unit{font-size:.4em;margin-left:5px;color:var(--cool);font-weight:600}
.metric__label{font-size:13px;line-height:1.6;letter-spacing:.06em;color:var(--cool)}
.panel--dark .metric__label,.panel--ink .metric__label,.panel--accent .metric__label{color:var(--rule)}
.panel--dark .metric__unit,.panel--ink .metric__unit,.panel--accent .metric__unit{color:var(--rule)}

/* 清单 */
.checklist{list-style:none;margin:0;padding:0;display:grid;gap:11px}
.checklist li{
  position:relative;
  padding-left:26px;
  font-size:15px;
  line-height:1.7;
  color:var(--graphite);
}
.checklist li::before{
  content:"";
  position:absolute;
  left:2px;
  top:9px;
  width:9px;
  height:5px;
  border-left:2px solid var(--celadon-deep);
  border-bottom:2px solid var(--celadon-deep);
  transform:rotate(-45deg);
}
.checklist--dark li{color:rgba(238,244,249,.88)}
.checklist--dark li::before{border-color:var(--celadon)}

/* 表格 */
.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}
table.data{
  width:100%;
  min-width:560px;
  border-collapse:collapse;
  font-size:14px;
  background:var(--white);
}
table.data caption{
  caption-side:top;
  text-align:left;
  padding:0 0 12px;
  font:600 12px/1.6 var(--font-mono);
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--cool);
}
table.data th,table.data td{
  padding:12px 14px;
  text-align:left;
  border-bottom:1px solid var(--rule-light);
  vertical-align:top;
}
table.data thead th{
  background:var(--blue);
  color:#fff;
  font-weight:700;
  font-size:12px;
  letter-spacing:.08em;
  white-space:nowrap;
  border-bottom:0;
}
table.data tbody tr{background:var(--white)}
table.data tbody tr:nth-child(even){background:var(--mist)}
table.data tbody tr:hover{background:#E1EDF7}
table.data td.num{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  text-align:right;
  white-space:nowrap;
}

/* 标签 */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 9px;
  border:1px solid currentColor;
  font:600 12px/1.4 var(--font-head);
  letter-spacing:.06em;
  white-space:nowrap;
}
.tag--ok{color:var(--celadon-deep)}
.tag--hot{color:var(--orange)}

/* 延伸链接 */
.link-more{
  display:inline-flex;
  align-items:center;
  gap:7px;
  font:600 14px/1 var(--font-head);
  color:var(--orange);
  text-decoration:none;
  padding-bottom:3px;
  border-bottom:1px solid rgba(255,90,24,.36);
  transition:border-color var(--t),color var(--t);
}
.link-more:hover{border-bottom-color:var(--orange);color:var(--orange)}
.link-more::after{content:"→";font-family:var(--font-mono)}

/* 面包屑 */
.breadcrumb{
  margin:0 0 18px;
  padding:0;
  list-style:none;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:7px;
  font:500 12px/1.5 var(--font-head);
  letter-spacing:.06em;
  color:var(--cool);
}
.breadcrumb li{display:flex;align-items:center;gap:7px}
.breadcrumb li+li::before{content:"/";color:var(--rule)}
.breadcrumb a{
  color:var(--cool);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color var(--t),border-color var(--t);
}
.breadcrumb a:hover{color:var(--orange);border-bottom-color:var(--orange)}
.breadcrumb [aria-current="page"]{color:var(--graphite)}

/* ==========================================================================
   图片容器基础规则（页面阶段放置图片占位）
   ========================================================================== */
.media{
  position:relative;
  display:block;
  overflow:hidden;
  aspect-ratio:16/10;
  border:1px solid var(--rule-soft);
  background-color:var(--blue);
  background-image:
    linear-gradient(rgba(143,182,212,.13) 1px,transparent 1px),
    linear-gradient(90deg,rgba(143,182,212,.13) 1px,transparent 1px);
  background-size:24px 24px,24px 24px;
  clip-path:polygon(0 0,calc(100% - 16px) 0,100% 16px,100% 100%,16px 100%,0 calc(100% - 16px));
}
.media img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}
.media--wide{aspect-ratio:21/9}
.media--tall{aspect-ratio:3/4}
.media--square{aspect-ratio:1/1}
.media__tag{
  position:absolute;
  left:12px;
  bottom:12px;
  padding:3px 8px;
  background:rgba(6,24,43,.78);
  font:600 11px/1.4 var(--font-mono);
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--rule);
}

/* ==========================================================================
   入场动效
   ========================================================================== */
.reveal{
  opacity:0;
  transform:translateY(12px);
  transition:opacity var(--t-slow),transform var(--t-slow);
}
.reveal.is-in{opacity:1;transform:none}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width:1080px){
  .header__actions{display:none}
  .nav-toggle{display:inline-flex}

  .nav{
    position:absolute;
    left:0;
    right:0;
    top:100%;
    display:none;
    background-color:var(--ink);
    background-image:
      linear-gradient(rgba(143,182,212,.07) 1px,transparent 1px),
      linear-gradient(90deg,rgba(143,182,212,.07) 1px,transparent 1px);
    background-size:32px 32px,32px 32px;
    border-bottom:1px solid rgba(143,182,212,.34);
    max-height:calc(100vh - var(--hdr-h));
    overflow-y:auto;
  }
  .nav[data-open]{display:block}

  .nav__list{
    flex-direction:column;
    gap:0;
    overflow:visible;
  }
  .nav__item{display:block}

  .nav__link{
    height:auto;
    padding:15px var(--gut);
    font-size:15px;
    border-bottom:1px solid rgba(143,182,212,.14);
  }
  .nav__link::after{
    left:0;
    right:auto;
    top:0;
    bottom:0;
    width:3px;
    height:auto;
    transform:scaleY(0);
    transform-origin:top center;
  }
  .nav__link[aria-current="page"]::after{transform:scaleY(1)}
  .nav__link[aria-current="page"]::before{display:none}

  .site-footer__inner{grid-template-columns:minmax(0,1fr)}
}

@media (max-width:900px){
  .grid--4,.grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (max-width:760px){
  :root{--hdr-h:60px}
  .brand__tagline{display:none}
  .footer__nav{grid-template-columns:repeat(3,minmax(0,1fr))}
}

@media (max-width:640px){
  .grid--2,.grid--3,.grid--4{grid-template-columns:minmax(0,1fr)}
  .site-footer__base-inner{flex-direction:column;align-items:flex-start}
}

@media (max-width:520px){
  .footer__nav{grid-template-columns:minmax(0,1fr)}
  .footer__meta-row{grid-template-columns:minmax(0,1fr);gap:3px}
  .footer__meta-row dd{font-size:13px}
}

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