/* ============================================================
 * 暗色首页（新版主页）
 * 只在「首页 + 布局=暗色」时加载，作用域全部挂在 body.kaimen-home-dark 下
 * ============================================================ */

@font-face{
  font-family:"Archivo X";
  src:url("archivo-italic-900.woff2") format("woff2");
  font-style:italic;
  font-weight:800 900;
  font-display:swap;
}

:root{
  --kd-green:#43d17e;
  --kd-green-2:#7df0b6;
  --kd-green-deep:#23945f;
  --kd-ink:#eef6f2;
  --kd-ink-2:rgba(230,247,240,.82);
  --kd-ink-3:rgba(214,240,231,.62);
  --kd-line:rgba(255,255,255,.14);
  --kd-glass:rgba(255,255,255,.065);
  --kd-radius:26px;
}

/* ---------- 页面底色 / 顶部导航 / 页脚 ---------- */
/* 主题在 body 上放了浅色渐变背景图，必须显式关掉，否则页面短的时候会露出白条 */
body.kaimen-home-dark,
body.kaimen-home-dark.kt-clear{
  background-color:#0a1c19!important;
  background-image:none!important;
  color:var(--kd-ink);
}
body.kaimen-home-dark #masthead{
  background:linear-gradient(180deg,rgba(8,24,21,.94),rgba(8,24,21,.72))!important;
  border-bottom:1px solid rgba(255,255,255,.08);
}
/* 主题把浅蓝底设在这层上，必须一起覆盖 */
body.kaimen-home-dark #masthead .site-header-upper-wrap,
body.kaimen-home-dark #masthead .site-header-upper-inner-wrap,
body.kaimen-home-dark #masthead .site-header-row-container,
body.kaimen-home-dark #masthead .site-header-row-container-inner,
body.kaimen-home-dark #masthead .site-main-header-wrap,
body.kaimen-home-dark #masthead .site-header-inner-wrap,
body.kaimen-home-dark #masthead .site-header-wrap{background:transparent!important}
body.kaimen-home-dark #masthead .custom-logo{filter:brightness(0) invert(1)}
body.kaimen-home-dark #masthead a,
body.kaimen-home-dark #masthead .menu-toggle{color:var(--kd-ink-2)!important}
body.kaimen-home-dark #masthead .header-search-icon,
body.kaimen-home-dark #masthead svg{fill:currentColor;color:var(--kd-ink-2)}
body.kaimen-home-dark #masthead .primary-menu-container a:hover,
body.kaimen-home-dark #masthead .current-menu-item > a{color:var(--kd-green-2)!important}
body.kaimen-home-dark #primary{padding:0}
/* 主题用的是「箱式内容」白底，暗色首页要把这些容器全部透明掉，否则会露出白条 */
body.kaimen-home-dark #inner-wrap,
body.kaimen-home-dark .site,
body.kaimen-home-dark .site-inner,
body.kaimen-home-dark #primary,
body.kaimen-home-dark .content-area,
body.kaimen-home-dark .content-bg,
body.kaimen-home-dark #content,
body.kaimen-home-dark #content-wrap,
body.kaimen-home-dark .site-main{background:transparent!important}
body.kaimen-home-dark .content-container.site-container,
body.kaimen-home-dark #main{max-width:none!important;padding-left:0!important;padding-right:0!important}
body.kaimen-home-dark #colophon,
body.kaimen-home-dark .site-footer{background:#081614;color:var(--kd-ink-3)}
body.kaimen-home-dark #colophon .site-footer-row-container,
body.kaimen-home-dark #colophon .site-footer-row-container-inner,
body.kaimen-home-dark #colophon .site-top-footer-wrap,
body.kaimen-home-dark #colophon .site-bottom-footer-wrap,
body.kaimen-home-dark #colophon .site-middle-footer-wrap,
body.kaimen-home-dark #colophon .site-footer-inner-wrap,
body.kaimen-home-dark #colophon .site-footer-wrap{background:transparent!important}
body.kaimen-home-dark #colophon a{color:var(--kd-ink-3)}
body.kaimen-home-dark #colophon a:hover{color:var(--kd-green-2)}

/* ---------- 通用容器 ---------- */
.kd-home{position:relative;padding:0 0 40px}

/* 隐藏主题头部时，用首页自带的极简导航 */
body.kaimen-home-dark.kd-hide-header #masthead{display:none!important}
.kd-nav{position:relative;z-index:2;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:22px 0 0}
.kd-brand{display:flex;align-items:center;gap:11px;text-decoration:none;color:var(--kd-ink)}
.kd-brand-mark{width:5px;height:22px;border-radius:3px;background:linear-gradient(180deg,var(--kd-green-2),var(--kd-green-deep));box-shadow:0 0 18px rgba(67,209,126,.65)}
.kd-brand-name{font-weight:800;letter-spacing:.14em;font-size:15px;color:var(--kd-ink)}
.kd-brand-sub{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:10px;letter-spacing:.22em;color:var(--kd-ink-3)}
.kd-nav-menu{display:flex;align-items:center;gap:6px;flex-wrap:wrap;justify-content:flex-end}
.kd-nav-menu a{color:var(--kd-ink-2);text-decoration:none;font-size:13.5px;font-weight:600;padding:9px 14px;border-radius:999px;white-space:nowrap}
.kd-nav-menu a:hover{color:#fff;background:rgba(255,255,255,.07)}
.kd-nav-menu a.kd-nav-cta{color:#04120c;background:linear-gradient(135deg,var(--kd-green-2),var(--kd-green));font-weight:800;box-shadow:0 10px 26px rgba(67,209,126,.28)}

/* 悬浮极简版：不占位置、没有底色，只把 Logo 和登录浮在 Hero 上层 */
.kd-nav--float{
  position:absolute;top:0;left:0;right:0;padding:24px 40px 0;
  pointer-events:none;
}
.kd-nav--float .kd-brand,
.kd-nav--float .kd-nav-menu{pointer-events:auto}
.kd-nav--float .kd-brand-mark{height:18px;opacity:.9}
.kd-nav--float .kd-brand-name{font-size:13.5px;letter-spacing:.16em;color:rgba(238,246,242,.78)}
.kd-nav--float .kd-brand-sub{font-size:9px;color:rgba(214,240,231,.42)}
.kd-nav--float .kd-nav-menu a{
  padding:7px 10px;font-size:13px;font-weight:500;
  color:rgba(230,247,240,.62);background:none;
}
.kd-nav--float .kd-nav-menu a:hover{color:#fff;background:none}

@media (max-width:640px){
  .kd-nav--float{padding:16px 18px 0}
  .kd-nav--float .kd-brand-name{font-size:12.5px}
  .kd-nav--float .kd-nav-menu a{padding:6px 8px;font-size:12.5px}
}
.kd-home::before{
  content:"";position:absolute;inset:0;z-index:0;pointer-events:none;
  background:
    radial-gradient(1000px 700px at 16% 4%, rgba(52,178,122,.42), transparent 62%),
    radial-gradient(860px 620px at 86% 12%, rgba(34,146,156,.34), transparent 60%),
    radial-gradient(1200px 820px at 50% 104%, rgba(30,132,96,.36), transparent 64%),
    linear-gradient(180deg,#0a1e1b 0%,#123028 42%,#0a1a18 100%);
}
.kd-home::after{
  content:"";position:absolute;inset:0;z-index:0;pointer-events:none;
  opacity:.9;
  background-image:
    linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(1200px 800px at 50% 26%,#000 20%,transparent 78%);
  -webkit-mask-image:radial-gradient(1200px 800px at 50% 26%,#000 20%,transparent 78%);
}
.kd-wrap{position:relative;z-index:1;width:100%;max-width:var(--kd-wrap,1680px);margin:0 auto;padding:0 40px}

/* ---------- Hero ---------- */
.kd-hero{padding:62px 0 30px;text-align:center}
.kd-title{
  margin:0;
  font-family:"Archivo X",Archivo,Impact,"Arial Black",sans-serif;
  font-style:italic;font-weight:900;text-transform:uppercase;
  font-size:clamp(46px,8.4vw,116px);line-height:.94;letter-spacing:-.025em;
}
.kd-title .l1{display:block;color:#fff;text-shadow:0 22px 60px rgba(0,0,0,.55)}
.kd-title .l2{display:block;color:var(--kd-green);text-shadow:0 22px 70px rgba(67,209,126,.30)}
.kd-meta{
  display:inline-flex;align-items:center;gap:12px;flex-wrap:wrap;justify-content:center;
  margin:24px auto 0;padding:11px 22px;border-radius:999px;
  background:rgba(3,10,9,.66);border:1px solid rgba(255,255,255,.12);
  font-family:"JetBrains Mono",ui-monospace,Menlo,Consolas,monospace;
  font-size:11.5px;letter-spacing:.18em;color:var(--kd-ink-3);
}
.kd-meta i{width:5px;height:5px;border-radius:50%;background:var(--kd-green);box-shadow:0 0 10px var(--kd-green)}

/* ---------- 两张入口大卡 ---------- */
/* 入口卡：张数变了自动适应（2 张 = 两列，3 张 = 三列；窄屏自动堆成一列）—— 2026-10-10 改 */
.kd-entry{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:24px;margin:52px 0 0}
.kd-ecard{
  position:relative;display:flex;flex-direction:column;justify-content:flex-end;
  /* 2026-10-06：原来写死 min-height:400px，内容只在底部，上面留一大片空背景。
     现在改成跟内容一样高（红框那种高度），背景图继续铺满。 */
  min-height:0;border-radius:var(--kd-radius);overflow:hidden;
  border:1px solid var(--kd-line);background:var(--kd-glass);
  box-shadow:0 30px 80px rgba(0,0,0,.5);
  text-decoration:none;
  transition:transform .25s ease,border-color .25s ease,box-shadow .25s ease;
}
.kd-ecard:hover{transform:translateY(-4px);border-color:rgba(67,209,126,.42);box-shadow:0 40px 96px rgba(0,0,0,.6)}
.kd-ecard .kd-art{position:absolute;inset:0}
.kd-ecard.kd-free .kd-art{
  background:
    radial-gradient(430px 330px at 26% 26%, rgba(140,246,190,.60), transparent 62%),
    radial-gradient(560px 430px at 80% 82%, rgba(29,122,81,.60), transparent 64%),
    linear-gradient(160deg,#114032,#061512);
}
.kd-ecard.kd-free .kd-art::after{
  content:"";position:absolute;inset:-8%;opacity:.85;
  background-image:
    repeating-linear-gradient(60deg,rgba(190,255,224,.16) 0 1px,transparent 1px 44px),
    repeating-linear-gradient(-60deg,rgba(190,255,224,.16) 0 1px,transparent 1px 44px),
    repeating-linear-gradient(0deg,rgba(190,255,224,.09) 0 1px,transparent 1px 76px);
  mask-image:radial-gradient(76% 74% at 42% 38%,#000 18%,transparent 78%);
  -webkit-mask-image:radial-gradient(76% 74% at 42% 38%,#000 18%,transparent 78%);
}
.kd-ecard.kd-vip .kd-art{
  background:
    radial-gradient(500px 380px at 60% 24%, rgba(96,190,175,.56), transparent 64%),
    radial-gradient(620px 470px at 20% 86%, rgba(32,116,96,.70), transparent 66%),
    linear-gradient(200deg,#123a33,#0a1f1b);
}
.kd-ecard .kd-sheen{
  position:absolute;inset:0;pointer-events:none;mix-blend-mode:screen;opacity:.6;
  background:linear-gradient(112deg,rgba(255,255,255,.12) 0 2px,transparent 2px 46%,rgba(255,255,255,.05) 46% 60%,transparent 60%);
}
.kd-ecard .kd-veil{position:absolute;inset:0;background:linear-gradient(180deg,rgba(3,9,8,.18) 0%,rgba(3,9,8,.68) 62%,rgba(3,9,8,.9) 100%)}
/* 第三张卡（音乐播放器）：图上自带文字，所以卡里不叠 HTML 文字 —— 2026-10-10 加
   高度：**不写 aspect-ratio**，让它跟同排的卡片一样高（grid 默认 stretch）；
   只在"单独占一行"（窄屏/换行）时用 min-height 兜底，避免塌成 0 高。
   图片用 contain 完整显示（不被裁掉图里的字），多出来的边用同色底补齐。 */
.kd-ecard.kd-player{min-height:160px;cursor:default;background-color:#0a1c19}
.kd-ecard.kd-player[href]{cursor:pointer}
.kd-ecard.kd-player .kd-art{background-size:contain;background-position:center;background-repeat:no-repeat}
.kd-ecard.kd-player .kd-veil{background:linear-gradient(180deg,rgba(3,9,8,.06) 0%,rgba(3,9,8,.14) 60%,rgba(3,9,8,.30) 100%)}
.kd-sr{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.kd-ecard .kd-ebody{position:relative;padding:30px 32px}
.kd-chip{display:inline-flex;align-items:center;gap:8px;padding:7px 15px;border-radius:999px;font-size:12.5px;font-weight:800;margin-bottom:14px}
.kd-chip.solid{background:linear-gradient(135deg,var(--kd-green-2),var(--kd-green));color:#05140e;box-shadow:0 10px 26px rgba(67,209,126,.30)}
.kd-chip.ghost{background:rgba(255,255,255,.08);color:#cfe9df;border:1px solid rgba(255,255,255,.18)}
.kd-ecard,
.kd-ecard h3,
.kd-ecard .kd-go{color:var(--kd-ink)}
.kd-ecard h3{margin:0 0 8px;font-size:clamp(26px,2.6vw,36px);font-weight:900;letter-spacing:-.02em;line-height:1.15;color:var(--kd-ink)}
.kd-ecard .kd-sub{margin:0 0 12px;font-size:14px;font-weight:700;color:var(--kd-green-2)}
.kd-ecard .kd-desc{margin:0 0 20px;font-size:13.5px;line-height:1.75;color:var(--kd-ink-3);max-width:30em}
.kd-go{display:inline-flex;align-items:center;gap:9px;font-size:13.5px;font-weight:800;color:#fff}
.kd-go svg{transition:transform .22s ease}
.kd-ecard:hover .kd-go svg{transform:translateX(5px)}

/* ---------- 栏目 ---------- */
.kd-section{margin:74px 0 0}
.kd-section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:20px;flex-wrap:wrap}
.kd-section-title{display:flex;align-items:center;gap:14px}
.kd-bar{width:5px;height:26px;border-radius:3px;background:linear-gradient(180deg,var(--kd-green-2),var(--kd-green-deep));box-shadow:0 0 16px rgba(67,209,126,.55)}
.kd-section-title h2{margin:0;font-size:24px;font-weight:900;letter-spacing:-.01em;color:var(--kd-ink)}
.kd-section-title span{display:block;margin-top:4px;font-family:ui-monospace,Menlo,Consolas,monospace;font-size:11px;letter-spacing:.2em;color:var(--kd-ink-3)}
.kd-count{font-size:12.5px;color:var(--kd-ink-3);font-family:ui-monospace,Menlo,Consolas,monospace;letter-spacing:.06em}
.kd-count a{color:var(--kd-green-2)}
/* 原理交互区块的说明小字（2026-10-10 加） */
.kd-section-desc{margin:-8px 0 22px;max-width:760px;font-size:14px;line-height:1.75;color:var(--kd-ink-3)}

.kd-filters{display:flex;flex-wrap:wrap;gap:10px;margin:0 0 24px;align-items:center}
.kd-filters a{
  padding:9px 17px;border-radius:999px;font-size:13px;font-weight:700;text-decoration:none;
  color:var(--kd-ink-2);background:rgba(255,255,255,.05);border:1px solid var(--kd-line);
  transition:.18s;
}
.kd-filters a:hover{color:#fff;border-color:rgba(67,209,126,.38);background:rgba(67,209,126,.12)}
.kd-filters a.on{color:#05140e;background:linear-gradient(135deg,var(--kd-green-2),var(--kd-green));border-color:transparent}
.kd-filters .kd-sep{width:1px;height:22px;background:var(--kd-line);margin:0 6px}

.kd-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(var(--kd-card-min,310px),1fr));gap:22px}
.kd-card{
  display:flex;flex-direction:column;border-radius:20px;overflow:hidden;text-decoration:none;color:inherit;
  background:var(--kd-glass);border:1px solid var(--kd-line);
  transition:transform .22s ease,border-color .22s ease,box-shadow .22s ease;
}
.kd-card:hover{transform:translateY(-5px);border-color:rgba(67,209,126,.40);box-shadow:0 30px 70px rgba(0,0,0,.5)}
.kd-card,.kd-card .kd-ctitle,.kd-card .kd-tag{color:var(--kd-ink)}
.kd-card .kd-tag.g{color:var(--kd-green-2)}
.kd-card .kd-tag{color:var(--kd-ink-3)}
.kd-thumb{position:relative;aspect-ratio:16/10;overflow:hidden;background:#0d221e}
.kd-thumb img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .5s ease}
.kd-card:hover .kd-thumb img{transform:scale(1.05)}
.kd-thumb::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(3,9,8,.0) 45%,rgba(3,9,8,.55) 100%);
}
.kd-badges{position:absolute;top:12px;right:12px;z-index:2;display:flex;gap:7px}
/* 置顶角标：左上角，黑底橙字，跟右侧的彩色角标区分开 */
.kd-pin{
  position:absolute;top:12px;left:12px;z-index:2;
  display:inline-flex;align-items:center;
  padding:5px 12px;border-radius:999px;
  font-size:11.5px;font-weight:800;letter-spacing:.04em;
  background:rgba(3,9,8,.92);color:#ff9f43;
  border:1px solid rgba(255,159,67,.45);
  box-shadow:0 6px 18px rgba(0,0,0,.35);
}
.kd-badges b{
  display:inline-flex;align-items:center;padding:5px 11px;border-radius:999px;
  font-size:11.5px;font-weight:800;letter-spacing:.03em;backdrop-filter:blur(6px);
  background:rgba(255,255,255,.16);color:#fff;border:1px solid rgba(255,255,255,.22);
}
.kd-badges b.kd-b-free{background:rgba(67,209,126,.92);color:#04140d;border-color:transparent}
.kd-badges b.kd-b-vip{background:rgba(4,12,11,.78);color:var(--kd-green-2);border-color:rgba(110,231,168,.45)}
.kd-cbody{padding:16px 18px 18px;display:flex;flex-direction:column;gap:10px;flex:1}
.kd-ctitle{margin:0;font-size:16.5px;font-weight:800;line-height:1.35;letter-spacing:-.01em;color:var(--kd-ink)}
.kd-tags{display:flex;gap:8px;flex-wrap:wrap;margin-top:auto}
.kd-tag{font-size:11.5px;font-weight:700;color:var(--kd-ink-3);padding:4px 10px;border-radius:999px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.08)}
.kd-tag.g{color:var(--kd-green-2);background:rgba(67,209,126,.10);border-color:rgba(67,209,126,.22)}

.kd-empty{padding:26px 0;color:var(--kd-ink-3)}
.kd-pager{display:flex;gap:12px;justify-content:center;margin:32px 0 0}
.kd-pager a{padding:10px 20px;border-radius:999px;text-decoration:none;font-weight:700;font-size:13px;color:var(--kd-ink-2);background:rgba(255,255,255,.06);border:1px solid var(--kd-line)}
.kd-pager a:hover{color:#fff;border-color:rgba(67,209,126,.4)}

@media (max-width:1080px){
  .kd-entry{grid-template-columns:1fr}
  .kd-ecard{min-height:0}
}
@media (max-width:640px){
  .kd-wrap{padding:0 18px}
  /* 2026-10-06：手机上「悬浮导航」是绝对定位，会压住 MAKE MATH / VISIBLE 两行大字，
     连 Logo 和「登录/注册」都被盖住。这里改成正常占位（导航自己占一行），
     同时把大标题缩小一点，两行字就不会顶到上面去。 */
  .kd-nav--float{position:static;padding:14px 0 0}
  .kd-title{font-size:clamp(30px,10.5vw,52px);line-height:1.02;letter-spacing:-.02em}
  .kd-home{overflow-x:hidden}
  .kd-hero{padding:26px 0 24px}
  .kd-meta{font-size:10px;letter-spacing:.10em;padding:9px 15px;gap:9px}
  .kd-meta .kd-only-l{display:none}
  .kd-entry{gap:16px;margin-top:32px}
  .kd-ecard .kd-ebody{padding:22px}
  .kd-section{margin-top:50px}
  .kd-grid{gap:16px}
  .kd-nav{padding:16px 0 0}
  .kd-nav-menu a{font-size:12.5px;padding:8px 11px}
  .kd-nav-menu a.kd-nav-cta .kd-price{display:none}
}