/* ==========================================================================
   Alliance Tower Defense Guide — 站点皮肤（从零重写，非母版视觉）
   设计依据：DESIGN-BRIEF.md
     · 底色 = 官方 512 图标 / 768×432 官方图的夜城深蓝（非近白、非万圣节橘黑）
     · 六色难度令牌 = 官方成就徽章本体底色（蓝/绿/黄/红/品红/橘）
     · 结构件：硬投影战术卡 + 切角 + 难度阶梯条 + HUD 读数条 + 联盟徽记
   ========================================================================== */

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@font-face{font-family:'Rubik';src:url('assets/fonts/rubik-latin.woff2') format('woff2');font-weight:300 900;font-style:normal;font-display:swap}

:root{
  --bg:#0a1020; --bg-2:#0f1729; --panel:#141d33; --panel-2:#1b2745;
  --line:#2a3a63; --line-soft:rgba(42,58,99,.62);
  --ink:#eaf1ff; --muted:#9db0d4; --shadow:#05080f;
  --welcome:#0090fe; --easy:#21f92b; --medium:#fde500; --hard:#e80202;
  --insane:#ff00ff; --crazy:#ff7d00; --gold:#ffc42e; --cyan:#6ffef0;
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  --maxw:1200px; --radius:6px; --radius-sm:4px;
  --hard:6px 6px 0 var(--shadow); --hard-sm:4px 4px 0 var(--shadow);
  color-scheme:dark;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;color:var(--ink);font:17px/1.62 var(--font);-webkit-font-smoothing:antialiased;
  background:
    radial-gradient(900px 520px at 6% -8%, rgba(33,249,43,.17), transparent 62%),
    radial-gradient(760px 470px at 98% 2%, rgba(255,0,255,.13), transparent 60%),
    radial-gradient(1100px 620px at 58% 106%, rgba(0,144,254,.17), transparent 64%),
    linear-gradient(180deg,#0a1020 0%,#0b1226 45%,#090e1c 100%);
  background-attachment:fixed;
}
img{max-width:100%;height:auto}
a{color:var(--easy);text-decoration:none}
a:hover{text-decoration:underline}
a:focus-visible{outline:2px dashed var(--easy);outline-offset:2px}
h1,h2,h3,h4{font-family:var(--display);font-weight:400;line-height:1.1;margin:0 0 .5em;letter-spacing:.2px}
code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;background:#0e1730;border:1px solid var(--line);
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strong{color:#fff}
.skip{position:absolute;left:-9999px}
.skip:focus{left:8px;top:8px;z-index:99;background:var(--panel);padding:8px 12px;border:2px solid var(--easy)}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 22px}

/* ------------------------------------------------- equality: ribbon / header */
.ribbon{background:linear-gradient(90deg,#0c1a12,#101f2f);border-bottom:2px solid rgba(33,249,43,.5)}
.ribbon .wrap{padding:9px 22px;font-size:13.5px;letter-spacing:.3px;color:#c9f7cd}
.ribbon .wrap::before{content:"◆ ";color:var(--easy)}
.topbar{position:sticky;top:0;z-index:30;background:linear-gradient(180deg,#111b32,#0c1425);border-bottom:2px solid var(--line)}
.topbar .bar{display:flex;align-items:center;gap:16px;flex-wrap:wrap;padding:11px 22px;min-height:64px}
.brand{display:flex;align-items:center;gap:11px;color:#fff;font-family:var(--display);font-size:17px;line-height:1.04;max-width:300px}
.brand:hover{text-decoration:none;color:var(--easy)}
.brand img{width:40px;height:40px;border-radius:50%;border:2px solid var(--easy);background:#07101f;flex:0 0 auto}
.nav{margin-left:auto;display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.nav ul{display:flex;gap:3px;margin:0;padding:0;list-style:none;flex-wrap:wrap}
.nav li{position:relative}
.nav a{display:inline-block;padding:9px 11px;color:var(--ink);font-family:var(--display);font-size:12.5px;letter-spacing:.6px;text-transform:uppercase}
.nav a:hover{color:var(--easy);text-decoration:none}
.nav li.active > a{color:var(--easy)}
.nav .has-kids > a::after{content:" ▾";color:var(--easy)}
.nav .kids{display:none;position:absolute;left:0;top:100%;min-width:250px;list-style:none;margin:0;padding:8px;
  background:var(--panel);border:2px solid var(--line);border-radius:var(--radius);box-shadow:var(--hard);z-index:60}
.nav .has-kids:hover .kids,.nav .has-kids:has(:focus-visible) .kids{display:flex;flex-direction:column;gap:2px}
/* 下拉与父项之间的透明桥（防止鼠标经过空隙时菜单消失） */
.nav li.has-kids::after{content:"";display:none;position:absolute;left:0;top:100%;width:250px;height:12px;z-index:55}
.nav li.has-kids:hover::after,.nav li.has-kids:has(:focus-visible)::after{display:block}
.nav .kids a{font-family:var(--font);font-weight:600;font-size:13px;text-transform:none;letter-spacing:0;padding:8px 10px;border-radius:var(--radius-sm);display:block}
.nav .kids a:hover{background:#1e2b4d;color:var(--easy)}
.nav .cta{background:var(--easy);color:#04160a!important;border:2px solid #0d3f18;border-radius:var(--radius-sm);
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.nav .cta:hover{background:#8dff99;text-decoration:none}

/* ------------------------------------------------------------------- hero */
.hero{position:relative;overflow:hidden;border-bottom:2px solid var(--line);
  background:linear-gradient(90deg,rgba(6,10,20,.96) 0%,rgba(8,13,26,.88) 44%,rgba(8,13,26,.58) 74%,rgba(8,13,26,.34) 100%),
             var(--hero,none) right 40%/cover no-repeat,
             linear-gradient(120deg,#0d1530,#101a2e)}
.hero::after{content:"";position:absolute;left:0;right:0;bottom:0;height:3px;z-index:3;
  background:linear-gradient(90deg,var(--welcome),var(--easy),var(--medium),var(--hard),var(--insane),var(--crazy))}
.hero-in{position:relative;z-index:2;padding:42px 22px 50px;display:grid;grid-template-columns:minmax(0,1.06fr) minmax(0,.94fr);gap:32px;align-items:center}
.hero-copy{min-width:0}
.eyebrow{display:inline-block;margin:0 0 14px;padding:6px 12px;border:2px solid var(--easy);border-radius:999px;
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.hero h1{font-size:clamp(36px,5.2vw,66px);color:#fff;text-shadow:4px 4px 0 var(--shadow),0 0 26px rgba(33,249,43,.26);margin:0 0 14px}
.hero h1 .ln{display:block}
.hero h1 .ln-2{color:var(--easy)}
.lead{font-size:18px;color:#cfe0ff;max-width:54ch;margin:0 0 20px}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap;margin:0}
.btn{display:inline-block;background:var(--easy);color:#04160a;border:2px solid #0d3f18;border-radius:var(--radius-sm);
  box-shadow:var(--hard-sm);padding:12px 18px;font-family:var(--display);font-size:13.5px;letter-spacing:.4px}
.btn:hover{background:#8dff99;text-decoration:none;transform:translate(-1px,-1px);box-shadow:5px 5px 0 var(--shadow)}
.btn.ghost{background:transparent;color:#fff;border-color:var(--line)}
.btn.ghost:hover{background:#1a2745;color:var(--easy)}
.hero-shot{margin:0;border:2px solid var(--line);border-radius:var(--radius);background:#0c1426;box-shadow:var(--hard);
  transform:rotate(-1.1deg);overflow:hidden}
.hero-shot img{display:block;width:100%;height:auto}
.hero-shot figcaption{padding:9px 12px;font-size:12.5px;color:var(--muted);border-top:2px solid var(--line);background:#0e1730}

/* ------------------------------------------------------------------ facts */
.facts-strip{background:#0c1526;border-bottom:2px solid var(--line)}
.facts{display:flex;flex-wrap:wrap;gap:10px;padding:16px 22px}
.fact{flex:1 1 148px;min-width:0;background:var(--panel);border:2px solid var(--line);border-left:5px solid var(--easy);
  border-radius:var(--radius);padding:10px 13px;box-shadow:3px 3px 0 var(--shadow)}
.fact-k{display:block;font-size:11px;letter-spacing:1.1px;text-transform:uppercase;color:var(--muted)}
.fact-v{display:block;font-family:var(--display);font-size:19px;color:var(--easy);margin-top:3px}

/* ------------------------------------------------ home body（裸正文兜底） */
.home-body{padding:34px 22px 46px}
.home-body > h2{font-size:27px;color:#fff;margin:34px 0 14px;padding-left:14px;border-left:5px solid var(--easy)}
.home-body > h2:first-child{margin-top:0}
.home-body > h3{font-size:19px;color:var(--cyan);margin:24px 0 8px}
.home-body > p,.home-body > ul,.home-body > ol{color:#dae5ff;max-width:88ch;margin:0 0 14px}
.home-body > ul,.home-body > ol{padding-left:22px}
.home-body > ul li,.home-body > ol li{margin:6px 0}
.home-body > ul li::marker{color:var(--easy)}
.home-body > ol li::marker{color:var(--easy);font-family:var(--display)}
.home-body > blockquote{margin:18px 0;padding:12px 16px;background:#101b31;border-left:4px solid var(--crazy);
  border-radius:0 var(--radius) var(--radius) 0}
.home-body > blockquote p{margin:0}
.home-body > .tbl-wrap{margin:16px 0 22px}
.section-head{display:flex;flex-direction:column;align-items:flex-start;gap:2px;margin:30px 0 14px;flex-wrap:wrap}
.section-head:first-child{margin-top:0}
.section-head h2{margin:0;font-size:26px;color:#fff}
.overline{font-size:11px;letter-spacing:1.3px;text-transform:uppercase;color:var(--muted);font-family:var(--display)}
.count-pill{margin-left:10px;background:var(--easy);color:#04160a;font-size:13px;padding:2px 10px;border-radius:999px;vertical-align:middle}

/* ------------------------------------------------------------------ cards */
.grid{display:flex;flex-wrap:wrap;gap:18px;margin:0 0 8px}
.grid[data-n="2"] > .card{flex:1 1 calc(50% - 9px)}
.grid[data-n="3"] > .card{flex:1 1 calc(33.333% - 12px)}
.grid[data-n="4"] > .card{flex:1 1 calc(25% - 14px)}
.card{flex:1 1 300px;min-width:0;display:flex;flex-direction:column;background:var(--panel);border:2px solid var(--line);
  border-radius:var(--radius);box-shadow:var(--hard);overflow:hidden;color:var(--ink);
  clip-path:polygon(0 0,calc(100% - 16px) 0,100% 16px,100% 100%,0 100%)}
.card:hover{text-decoration:none;border-color:var(--easy);transform:translate(-2px,-2px);box-shadow:8px 8px 0 var(--shadow)}
.card .thumb{display:block;position:relative;background:#0a1220;border-bottom:2px solid var(--line)}
.card .thumb img{display:block;width:100%;aspect-ratio:16/9;object-fit:cover}
.pill-tag{position:absolute;left:10px;bottom:-11px;background:var(--easy);color:#04160a;font-family:var(--display);
  font-size:11px;letter-spacing:.6px;text-transform:uppercase;padding:4px 9px;border-radius:var(--radius-sm);border:2px solid #071a0c}
.card-body{padding:20px 15px 15px;display:flex;flex-direction:column;gap:8px;flex:1}
.card-body h3{margin:0;font-size:17.5px;color:#fff}
.card-body p{margin:0;color:#c6d4ef;font-size:14.5px;line-height:1.5;flex:1}
.go{font-family:var(--display);font-size:12px;letter-spacing:.5px;color:var(--easy)}
.stamp{font-size:11.5px;letter-spacing:.7px;text-transform:uppercase;color:var(--muted)}
.card.sm{flex:1 1 200px}
.card.sm .card-body{padding:14px 12px}
.card.sm .card-body h3{font-size:15px}

/* ---------------------------------------------------------------- article */
.article-grid{display:grid;grid-template-columns:minmax(0,1fr) 236px;gap:30px;align-items:start;padding:26px 22px 52px}
.article-grid > div{min-width:0}
.crumb{font-size:13.5px;color:var(--muted);margin:0 0 14px}
.crumb a{color:var(--muted)}
.crumb .sep{margin:0 6px;color:var(--line)}
.crumb .here{color:#fff;font-weight:600}
article{background:var(--panel);border:2px solid var(--line);border-radius:var(--radius);box-shadow:var(--hard);
  padding:26px 26px 30px;min-width:0}
article h1{font-size:clamp(27px,3.3vw,38px);color:#fff;text-shadow:3px 3px 0 var(--shadow);margin-bottom:14px}
article h2{font-size:23px;color:#fff;margin:32px 0 12px;padding-left:13px;border-left:4px solid var(--easy)}
article h3{font-size:18px;color:var(--cyan);margin:22px 0 8px}
article p,article li{color:#d8e3fc}
article p{max-width:92ch}
article ul,article ol{padding-left:22px}
article li{margin:6px 0}
article ul li::marker{color:var(--easy)}
article img.zoom{display:block;width:100%;border:2px solid var(--line);border-radius:var(--radius);margin:16px 0 6px;cursor:zoom-in;background:#0b1220}
.art-lead{font-size:17.5px;color:#cfe0ff;margin:0 0 6px;max-width:88ch}
.tbl-wrap{margin:16px 0 22px;overflow-x:auto;border:2px solid var(--line);border-radius:var(--radius);background:#101a2e}
table{border-collapse:collapse;width:100%;font-size:14.5px}
th,td{padding:10px 12px;text-align:left;border-bottom:1px solid var(--line-soft);vertical-align:top}
thead th{background:var(--panel-2);color:#fff;font-family:var(--display);font-size:12px;letter-spacing:.5px;text-transform:uppercase}
tbody tr:nth-child(even){background:rgba(33,249,43,.045)}
tbody tr:last-child td{border-bottom:0}
table strong,table b{color:inherit}
td.num{font-family:var(--display);color:var(--easy)}
.quick-answer{margin:0 0 22px;padding:16px 18px 14px;background:#101d2c;border:2px solid var(--easy);
  border-radius:var(--radius);box-shadow:4px 4px 0 var(--shadow)}
.quick-answer p{margin:6px 0 0;color:#e6f4ff;max-width:92ch}
.qa-stamp{display:inline-block;background:var(--easy);color:#04160a;font-family:var(--display);font-size:11px;letter-spacing:.8px;text-transform:uppercase;padding:3px 9px;border-radius:var(--radius-sm)}
.callout{margin:18px 0;padding:14px 16px;background:#101b31;border-left:4px solid var(--cyan);border-radius:0 var(--radius) var(--radius) 0}
.callout p{margin:0 0 8px;max-width:90ch}
.callout p:last-child{margin:0}
.callout.note{border-left-color:var(--welcome)}
.callout.warn{border-left-color:var(--crazy)}
.toc{position:sticky;top:16px;background:var(--panel);border:2px solid var(--line);border-radius:var(--radius);box-shadow:var(--hard-sm);padding:14px}
.toc .overline{display:block;margin-bottom:8px}
.toc-list{display:flex;flex-direction:column;gap:6px}
.toc-list a{font-size:13.5px;color:#c9d8f6;border-left:2px solid var(--line);padding-left:9px}
.toc-list a:hover{color:var(--easy);border-left-color:var(--easy);text-decoration:none}
.all-guides{margin-top:34px;padding-top:20px;border-top:2px dashed var(--line)}
.all-guides .grid{gap:14px}
.more-guides{margin:14px 0 0;font-family:var(--display);font-size:13px}

/* 难度阶梯条（官方徽章六色；modes / badges 页共用） */
.mode-ladder{display:flex;flex-wrap:wrap;gap:8px;margin:16px 0 20px;padding:0;list-style:none}
@media (min-width:901px){ .mode-ladder{display:grid;grid-template-columns:repeat(6,minmax(0,1fr))} }
.mode-ladder li{flex:1 1 150px;min-width:0;border:2px solid var(--line);border-radius:var(--radius);padding:10px 12px;
  background:#101a2e;box-shadow:3px 3px 0 var(--shadow)}
.mode-ladder .m-name{display:block;font-family:var(--display);font-size:13px;letter-spacing:.5px}
.mode-ladder .m-note{display:block;font-size:12.5px;color:var(--muted)}
.mode-ladder .m-welcome{border-left:6px solid var(--welcome)} .mode-ladder .m-welcome .m-name{color:var(--welcome)}
.mode-ladder .m-easy{border-left:6px solid var(--easy)} .mode-ladder .m-easy .m-name{color:var(--easy)}
.mode-ladder .m-medium{border-left:6px solid var(--medium)} .mode-ladder .m-medium .m-name{color:var(--medium)}
.mode-ladder .m-hard{border-left:6px solid var(--hard)} .mode-ladder .m-hard .m-name{color:var(--hard)}
.mode-ladder .m-insane{border-left:6px solid var(--insane)} .mode-ladder .m-insane .m-name{color:var(--insane)}
.mode-ladder .m-crazy{border-left:6px solid var(--crazy)} .mode-ladder .m-crazy .m-name{color:var(--crazy)}
.emb-grid{display:flex;flex-wrap:wrap;gap:14px;margin:16px 0 22px;padding:0;list-style:none}
.emb-grid li{flex:1 1 160px;min-width:0;text-align:center;background:#101a2e;border:2px solid var(--line);
  border-radius:var(--radius);padding:12px;box-shadow:3px 3px 0 var(--shadow)}
.emb-grid img{width:84px;height:84px;margin:0 auto 8px;display:block}
.emb-grid b{display:block;font-family:var(--display);font-size:13px;color:#fff}
.emb-grid span{display:block;font-size:12.5px;color:var(--muted)}
.stamp-check{display:inline-block;transform:rotate(-3deg);border:2px dashed var(--gold);color:var(--gold);
  font-family:var(--display);font-size:11.5px;letter-spacing:.7px;padding:5px 10px;border-radius:var(--radius-sm);margin:0 0 14px}

/* ---------------------------------------------------------------- footer */
.foot{border-top:2px solid var(--line);background:#0b1324;padding:30px 0 40px;margin-top:34px}
.foot .wrap{display:flex;flex-direction:column;gap:10px}
.disclaimer{color:var(--muted);font-size:13.5px;max-width:100ch;margin:0}
.foot-links{margin:0;display:flex;flex-wrap:wrap;gap:8px;align-items:center;font-family:var(--display);font-size:12.5px;letter-spacing:.4px}
.foot-links a{color:#cfe0ff}
.foot-links a:hover{color:var(--easy)}
.muted{color:#7d8fb5;font-size:12.5px;margin:0}

/* ---------------------------------------------------------------- ad slot */
@media (hover: hover) and (pointer: fine){ .ad-slot{display:block} }
@media not all and (hover: hover) and (pointer: fine){ .ad-slot{display:none} }
.ad-slot{margin:26px auto;max-width:var(--maxw)}
.ad-inner{min-height:90px;border:1px dashed var(--line);border-radius:var(--radius);background:var(--panel);overflow:hidden}

/* -------------------------------------------------------------- lightbox */
.lightbox{position:fixed;inset:0;z-index:200;background:rgba(4,7,16,.94);display:flex;align-items:center;
  justify-content:center;padding:20px;cursor:zoom-out}
.lightbox img{max-width:min(1500px,96vw);max-height:92vh;width:auto;height:auto;border:2px solid var(--line);box-shadow:8px 8px 0 rgba(0,0,0,.6)}
article img.zoom.open{max-width:min(1200px,96vw);cursor:zoom-out;border-color:var(--easy)}
.tbl-wrap table{min-width:520px}

/* ------------------------------------------------------------ responsive */
@media (max-width:1000px){
  .hero-in{grid-template-columns:minmax(0,1fr);gap:22px}
  .hero-shot{transform:none}
  .article-grid{grid-template-columns:minmax(0,1fr);gap:22px}
  .toc{position:static}
}
@media (max-width:900px){
  .grid[data-n="3"] > .card,.grid[data-n="4"] > .card{flex:1 1 calc(50% - 10px)}
}
@media (max-width:820px){
  .topbar .bar{flex-wrap:wrap;padding:9px 14px}
  .brand{max-width:100%;font-size:15px}
  .nav{margin-left:0;width:100%;gap:8px}
  .nav ul{flex-wrap:wrap;white-space:normal}
  .nav .kids{min-width:230px}
  .nav li.has-kids::after{display:none}
}
@media (max-width:760px){
  .grid[data-n="2"] > .card,.grid[data-n="3"] > .card,.grid[data-n="4"] > .card,.card{flex:1 1 100%}
  article{padding:18px 16px 22px}
  article h1{font-size:26px}
  .hero h1{font-size:34px}
}
@media (max-width:620px){
  body{font-size:16px}
  .wrap{padding:0 14px}
  .home-body,.article-grid,.facts{padding-left:14px;padding-right:14px}
  .hero-in{padding:28px 14px 32px}
  .fact{flex:1 1 45%}
  .mode-ladder li,.emb-grid li{flex:1 1 100%}
}
@media print{.topbar,.ribbon,.foot,.toc,.ad-slot{display:none}}