/* Nightwater Guide — "夜航日志":墨蓝夜色承载阅读,羊皮纸面板承载数据,琥珀灯火做点睛。
   字体:Averia Serif Libre(标题)+ Atkinson Hyperlegible(正文);中文回退系统黑体。 */
:root{
  --ink:oklch(17% 0.03 275);        /* 页面底:带紫调的墨蓝 */
  --ink-2:oklch(21% 0.035 275);     /* 次级面 */
  --ink-3:oklch(26% 0.04 275);      /* 分隔/边框 */
  --ink-line:oklch(32% 0.035 275);
  --fg:oklch(93% 0.012 80);         /* 正文:暖白 */
  --fg-2:oklch(74% 0.02 275);       /* 次级文字:紫灰 */
  --paper:oklch(91% 0.035 85);      /* 羊皮纸 */
  --paper-2:oklch(86% 0.045 82);
  --paper-ink:oklch(24% 0.03 60);   /* 纸上的墨 */
  --paper-mute:oklch(45% 0.03 60);
  --amber:oklch(78% 0.15 75);       /* 灯火 */
  --amber-deep:oklch(62% 0.15 60);
  --link:oklch(84% 0.09 80);
  --max:1180px;
  --measure:70ch;
  --font-display:"Averia Serif Libre",Georgia,"Songti SC","Noto Serif SC",serif;
  --font-body:"Atkinson Hyperlegible","PingFang SC","Hiragino Sans GB","Noto Sans SC","Microsoft YaHei",system-ui,sans-serif;
  --s1:4px;--s2:8px;--s3:12px;--s4:16px;--s5:24px;--s6:32px;--s7:48px;--s8:64px;--s9:96px;
  --ease:cubic-bezier(.16,1,.3,1);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--ink);color:var(--fg);font:17px/1.7 var(--font-body);position:relative;overflow-x:hidden}
/* 细颗粒:让大面积深色不发"塑料" */
body::before{content:"";position:fixed;inset:0;pointer-events:none;z-index:0;opacity:.07;mix-blend-mode:overlay;
  background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>")}
:lang(zh) body,body:lang(zh){font-family:var(--font-body)}
a{color:var(--link);text-decoration:underline;text-decoration-color:color-mix(in oklch,var(--amber) 45%,transparent);text-underline-offset:3px;text-decoration-thickness:1px;transition:text-decoration-color .2s var(--ease),color .2s var(--ease)}
a:hover{color:var(--amber);text-decoration-color:var(--amber)}
img{max-width:100%;height:auto}
h1,h2,h3{font-family:var(--font-display);font-weight:700;letter-spacing:-.01em;color:var(--fg);margin:0}
:lang(zh) h1,:lang(zh) h2,:lang(zh) h3{letter-spacing:0}
.wrap{max-width:var(--max);margin:0 auto;padding:0 clamp(16px,4vw,40px);position:relative;z-index:1}
.muted{color:var(--fg-2);font-size:14px}

/* ---------- header ---------- */
.hdr{position:sticky;top:0;z-index:20;background:color-mix(in oklch,var(--ink) 88%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--ink-3)}
.hdr-in{display:flex;align-items:center;gap:var(--s4);min-height:64px}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--font-display);font-weight:700;font-size:20px;color:var(--fg);text-decoration:none;white-space:nowrap}
.brand img{border-radius:6px;box-shadow:0 0 0 1px var(--ink-line)}
.nav{margin-left:auto;display:flex;align-items:center;gap:2px;flex-wrap:wrap}
.nav a{color:var(--fg-2);padding:8px 12px;border-radius:6px;font-weight:400;font-size:15px;text-decoration:none;position:relative}
.nav a::after{content:"";position:absolute;left:12px;right:12px;bottom:4px;height:1px;background:var(--amber);transform:scaleX(0);transform-origin:left;transition:transform .25s var(--ease)}
.nav a:hover::after,.nav a.on::after{transform:scaleX(1)}
.nav a.on,.nav a:hover{color:var(--fg)}
.nav-toggle{display:none;margin-left:auto;background:none;border:1px solid var(--ink-line);color:var(--fg);font-size:20px;border-radius:6px;padding:4px 10px;cursor:pointer}
.lang{position:relative;margin-left:var(--s2)}
.lang-btn{background:transparent;color:var(--fg-2);border:1px solid var(--ink-line);border-radius:6px;padding:6px 12px;cursor:pointer;font:inherit;font-size:14px}
.lang-menu{display:none;position:absolute;right:0;top:120%;background:var(--paper);color:var(--paper-ink);border-radius:8px;min-width:150px;padding:6px;flex-direction:column;box-shadow:0 18px 40px -12px oklch(0% 0 0/.6)}
.lang.open .lang-menu{display:flex}.lang-menu a{padding:8px 12px;color:var(--paper-ink);text-decoration:none;border-radius:6px}.lang-menu a:hover{background:var(--paper-2)}
@media(max-width:860px){.nav-toggle{display:block}.nav{display:none;width:100%;flex-direction:column;align-items:stretch;padding-bottom:12px}body.nav-open .nav{display:flex}.lang{align-self:flex-start}}
main{padding:0 0 var(--s9);position:relative;z-index:1}

/* ---------- hero:全宽夜空 + 60/40 非对称 ---------- */
.hero{position:relative;margin:0 calc(50% - 50vw) var(--s7);padding:clamp(48px,8vw,112px) 0 clamp(40px,6vw,80px);overflow:hidden;border-bottom:1px solid var(--ink-3)}
.hero-sky{position:absolute;inset:0;z-index:0;
  background:
    radial-gradient(60% 80% at 78% 20%,oklch(34% 0.09 290/.55),transparent 60%),
    radial-gradient(40% 50% at 10% 90%,oklch(40% 0.1 60/.28),transparent 60%),
    linear-gradient(180deg,oklch(15% 0.03 280),var(--ink));}
.hero-sky::after{content:"";position:absolute;inset:0;opacity:.55;
  background-image:radial-gradient(1px 1px at 12% 22%,oklch(95% .02 90/.9) 50%,transparent 51%),radial-gradient(1px 1px at 37% 68%,oklch(95% .02 90/.7) 50%,transparent 51%),radial-gradient(1.5px 1.5px at 63% 14%,oklch(95% .02 90/.9) 50%,transparent 51%),radial-gradient(1px 1px at 82% 56%,oklch(95% .02 90/.6) 50%,transparent 51%),radial-gradient(1px 1px at 91% 31%,oklch(95% .02 90/.8) 50%,transparent 51%),radial-gradient(1px 1px at 24% 84%,oklch(95% .02 90/.5) 50%,transparent 51%),radial-gradient(1.5px 1.5px at 50% 40%,oklch(95% .02 90/.7) 50%,transparent 51%),radial-gradient(1px 1px at 70% 80%,oklch(95% .02 90/.6) 50%,transparent 51%);
  background-size:900px 600px}
.hero-in{position:relative;z-index:1;max-width:var(--max);margin:0 auto;padding:0 clamp(16px,4vw,40px);display:grid;grid-template-columns:minmax(0,3fr) minmax(0,2fr);gap:clamp(24px,5vw,72px);align-items:center}
@media(max-width:900px){.hero-in{grid-template-columns:1fr}.hero-art{order:-1;max-width:520px}}
.kicker{display:inline-flex;align-items:center;gap:10px;color:var(--amber);font-weight:700;letter-spacing:.14em;text-transform:uppercase;font-size:12px;margin-bottom:var(--s4)}
.kicker::before{content:"";width:28px;height:1px;background:var(--amber)}
.hero h1{font-size:clamp(38px,6.2vw,76px);line-height:1.02;margin:0 0 var(--s5);font-weight:700;text-wrap:balance}
.hero .lead{font-size:clamp(17px,1.6vw,21px);color:var(--fg-2);max-width:56ch;margin:0 0 var(--s6);line-height:1.6}
.cta{display:flex;gap:var(--s3);flex-wrap:wrap;align-items:center}
.btn{display:inline-block;background:var(--amber);color:var(--paper-ink);font-weight:700;padding:13px 22px;border-radius:6px;text-decoration:none;box-shadow:4px 4px 0 var(--amber-deep);transition:transform .2s var(--ease),box-shadow .2s var(--ease)}
.btn:hover{transform:translate(-1px,-1px);box-shadow:6px 6px 0 var(--amber-deep);color:var(--paper-ink)}
.btn.ghost{background:transparent;color:var(--fg);border:1px solid var(--ink-line);box-shadow:none}
.btn.ghost:hover{border-color:var(--fg-2);transform:none;color:var(--fg)}
.hero-art{margin:0;position:relative;transform:rotate(1.5deg);transition:transform .5s var(--ease)}
.hero-art:hover{transform:rotate(0deg)}
.hero-art img{display:block;width:100%;border-radius:4px;border:6px solid var(--paper);box-shadow:0 30px 60px -20px oklch(0% 0 0/.7),0 0 0 1px oklch(0% 0 0/.4)}
.hero-art figcaption{margin-top:10px;font-size:12px;color:var(--fg-2);font-style:italic;text-align:right}
/* 入场 */
@media(prefers-reduced-motion:no-preference){
  .hero .kicker,.hero h1,.hero .lead,.hero .cta,.hero-art{opacity:0;animation:rise .9s var(--ease) forwards}
  .hero h1{animation-delay:.08s}.hero .lead{animation-delay:.16s}.hero .cta{animation-delay:.24s}.hero-art{animation-delay:.2s}
  @keyframes rise{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}
  .hero-art{animation-name:rise-art}@keyframes rise-art{from{opacity:0;transform:translateY(14px) rotate(1.5deg)}to{opacity:1;transform:rotate(1.5deg)}}
}

/* ---------- ledger:羊皮纸事实条 ---------- */
.ledger{margin:calc(-1 * var(--s7) - 28px) 0 var(--s8);position:relative;z-index:2}
.ledger dl{margin:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));background:var(--paper);color:var(--paper-ink);border-radius:8px;box-shadow:0 24px 50px -24px oklch(0% 0 0/.8);overflow:hidden}
.ledger div{padding:14px 18px;border-right:1px solid color-mix(in oklch,var(--paper-ink) 14%,transparent)}
.ledger div:last-child{border-right:0}
.ledger dt{font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--paper-mute);font-weight:700}
.ledger dd{margin:2px 0 0;font-family:var(--font-display);font-size:20px;font-weight:700;line-height:1.2}
@media(max-width:640px){.ledger div{border-right:0;border-bottom:1px solid color-mix(in oklch,var(--paper-ink) 14%,transparent)}.ledger div:last-child{border-bottom:0}}

/* ---------- prose ---------- */
.prose,.intro{max-width:var(--measure);font-size:18px;line-height:1.75}
.intro p{margin:0 0 var(--s4)}
.intro p:first-child::first-letter{font-family:var(--font-display);font-size:3.6em;float:left;line-height:.85;margin:6px 10px 0 0;color:var(--amber)}
:lang(zh) .intro p:first-child::first-letter{font-size:1em;float:none;margin:0;color:inherit}

/* ---------- 编号索引(替代四张同款卡) ---------- */
.index{margin:var(--s8) 0}
.index ol{list-style:none;margin:0;padding:0;border-top:1px solid var(--ink-line)}
.index li a{display:grid;grid-template-columns:72px minmax(0,1fr) 40px;gap:var(--s4);align-items:center;padding:22px 0;border-bottom:1px solid var(--ink-line);text-decoration:none;color:var(--fg);transition:background .25s var(--ease),padding .25s var(--ease)}
.index li a:hover{background:linear-gradient(90deg,color-mix(in oklch,var(--amber) 10%,transparent),transparent 60%);padding-left:10px}
.index .num{font-family:var(--font-display);font-size:34px;color:var(--amber);line-height:1}
.index strong{display:block;font-family:var(--font-display);font-size:clamp(20px,2.2vw,26px);font-weight:700;margin-bottom:2px}
.index .idx-body span{color:var(--fg-2);font-size:15px;display:block;max-width:60ch}
.index .arrow{color:var(--fg-2);font-size:22px;text-align:right;transition:transform .25s var(--ease),color .25s var(--ease)}
.index li a:hover .arrow{transform:translateX(6px);color:var(--amber)}
@media(max-width:560px){.index li a{grid-template-columns:48px minmax(0,1fr)}.index .arrow{display:none}.index .num{font-size:26px}}

/* ---------- section titles ---------- */
.sec{font-size:clamp(24px,2.6vw,32px);margin:0 0 var(--s5);display:flex;align-items:baseline;gap:var(--s3)}
.sec::after{content:"";flex:1;height:1px;background:var(--ink-line);transform:translateY(-6px)}

/* ---------- two columns:攻略 / 更新 ---------- */
.two{display:grid;grid-template-columns:minmax(0,7fr) minmax(0,5fr);gap:clamp(32px,6vw,88px);margin:var(--s9) 0}
@media(max-width:820px){.two{grid-template-columns:1fr;gap:var(--s7)}}
.guide-list{list-style:none;margin:0;padding:0;counter-reset:g}
.guide-list li{counter-increment:g;display:grid;grid-template-columns:40px minmax(0,1fr);gap:var(--s3);padding:16px 0;border-bottom:1px solid var(--ink-3)}
.guide-list li::before{content:counter(g,decimal-leading-zero);font-family:var(--font-display);color:var(--amber-deep);font-size:15px;padding-top:6px}
.guide-list a{font-family:var(--font-display);font-size:clamp(19px,1.8vw,22px);font-weight:700;color:var(--fg);text-decoration:none;line-height:1.3}
.guide-list a:hover{color:var(--amber)}
.guide-list p{margin:4px 0 0;color:var(--fg-2);font-size:15px;max-width:52ch}
.timeline{list-style:none;margin:0;padding:0 0 0 18px;border-left:1px solid var(--ink-line)}
.timeline li{position:relative;padding:0 0 22px 18px}
.timeline li::before{content:"";position:absolute;left:-22px;top:9px;width:7px;height:7px;border-radius:50%;background:var(--ink);border:1px solid var(--amber)}
.timeline li:first-child::before{background:var(--amber)}
.timeline time{display:block;font-size:12px;letter-spacing:.08em;color:var(--fg-2);text-transform:uppercase;margin-bottom:2px}
.timeline a{color:var(--fg);text-decoration:none;font-weight:700}.timeline a:hover{color:var(--amber)}
.list{list-style:none;padding:0;margin:0}.list li{padding:12px 0;border-bottom:1px solid var(--ink-3)}.list li a{font-family:var(--font-display);font-weight:700;color:var(--fg);font-size:19px;text-decoration:none}.list li a:hover{color:var(--amber)}.list li p{margin:4px 0 0;color:var(--fg-2);font-size:15px}.list.big li a{font-size:22px}

/* ---------- screenshots:一大四小 ---------- */
.shots{margin:var(--s9) 0}
.shot-grid{display:grid;grid-template-columns:repeat(4,1fr);grid-auto-rows:150px;gap:10px}
.shot-grid img{width:100%;height:100%;object-fit:cover;border-radius:4px;border:1px solid var(--ink-line);filter:saturate(.92);transition:filter .3s var(--ease),transform .3s var(--ease)}
.shot-grid img:hover{filter:saturate(1.05);transform:scale(1.01)}
.shot-grid img.big{grid-column:span 2;grid-row:span 2}
@media(max-width:720px){.shot-grid{grid-template-columns:repeat(2,1fr);grid-auto-rows:120px}.shot-grid img.big{grid-column:span 2;grid-row:span 2}}

/* ---------- FAQ ---------- */
.faq{margin:var(--s9) 0 var(--s7);max-width:820px}
.faq details{border-top:1px solid var(--ink-line);padding:6px 0}
.faq details:last-of-type{border-bottom:1px solid var(--ink-line)}
.faq summary{cursor:pointer;font-family:var(--font-display);font-weight:700;font-size:19px;padding:14px 40px 14px 0;list-style:none;position:relative;color:var(--fg)}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:4px;top:10px;font-size:26px;color:var(--amber);font-weight:400;transition:transform .3s var(--ease)}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq details>div{padding:0 0 16px;color:var(--fg-2);max-width:65ch}

/* ---------- article ---------- */
.art-grid{display:grid;grid-template-columns:minmax(0,1fr);gap:clamp(32px,5vw,72px);align-items:start;padding-top:var(--s6)}
@media(min-width:1100px){.art-grid{grid-template-columns:minmax(0,1fr) 300px}.side{position:sticky;top:84px}}
.article{max-width:760px;min-width:0}
.article h1{font-size:clamp(32px,4.6vw,54px);line-height:1.06;margin:10px 0 var(--s4);text-wrap:balance}
.article .lead{font-size:20px;color:var(--fg-2);line-height:1.55;max-width:60ch;margin:0 0 var(--s3)}
.byline{color:var(--fg-2);font-size:14px;margin:0 0 var(--s6);display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.byline::before{content:"";width:24px;height:1px;background:var(--amber)}
.crumbs{font-size:13px;color:var(--fg-2);letter-spacing:.02em}.crumbs a{color:var(--fg-2);text-decoration:none}.crumbs a:hover{color:var(--amber)}
.art-hero{margin:0 0 var(--s7)}
.art-hero img{width:100%;display:block;border-radius:4px;border:5px solid var(--paper);box-shadow:0 24px 50px -24px oklch(0% 0 0/.8)}
.art-hero figcaption{color:var(--fg-2);font-size:12px;margin-top:8px;font-style:italic}
.toc{background:var(--paper);color:var(--paper-ink);border-radius:8px;padding:18px 22px;margin:0 0 var(--s7);box-shadow:0 20px 40px -24px oklch(0% 0 0/.8)}
.toc strong{font-family:var(--font-display);font-size:14px;letter-spacing:.1em;text-transform:uppercase;color:var(--paper-mute)}
.toc ol{margin:8px 0 0;padding-left:22px;columns:1}.toc li{padding:3px 0}.toc a{color:var(--paper-ink);text-decoration-color:color-mix(in oklch,var(--paper-ink) 30%,transparent)}.toc a:hover{color:var(--amber-deep)}
.article section{counter-increment:sec}
.article h2{font-size:clamp(24px,2.8vw,32px);line-height:1.2;margin:var(--s8) 0 var(--s4);padding-top:var(--s4);border-top:1px solid var(--ink-line);display:flex;gap:14px;align-items:baseline}
.article h2::before{content:counter(sec,decimal-leading-zero);font-size:14px;color:var(--amber);letter-spacing:.08em;font-family:var(--font-body);font-weight:700;flex:none}
.article h3{font-size:20px;margin:var(--s5) 0 var(--s2)}
.article p,.article li{font-size:17.5px;line-height:1.75;max-width:var(--measure)}
.article p{margin:0 0 var(--s4)}
.article ul,.article ol{padding-left:22px;margin:0 0 var(--s4)}.article li{margin:4px 0}
.article ul li::marker{color:var(--amber)}
.article table{border-collapse:collapse;width:100%;margin:var(--s4) 0 var(--s5);font-size:15px;background:var(--paper);color:var(--paper-ink);border-radius:6px;overflow:hidden;box-shadow:0 20px 40px -26px oklch(0% 0 0/.8)}
.article th,.article td{border-bottom:1px solid color-mix(in oklch,var(--paper-ink) 14%,transparent);padding:10px 12px;text-align:left;vertical-align:top}
.article th{background:var(--paper-2);font-family:var(--font-display);font-size:14px;letter-spacing:.02em}
.article tr:last-child td{border-bottom:0}
.kv th{width:36%;color:var(--paper-mute);font-weight:600}
.related,.sources{margin-top:var(--s7);padding-top:var(--s4);border-top:1px solid var(--ink-line);font-size:15px}
.related h3,.sources h3{font-size:13px;letter-spacing:.12em;text-transform:uppercase;color:var(--fg-2);margin:0 0 var(--s3);font-family:var(--font-body)}
.related ul,.sources ul{margin:0;padding-left:18px}.related li,.sources li{margin:4px 0}
.updated{color:var(--fg-2);font-size:13px;margin-top:var(--s7);font-style:italic}
.news{margin-bottom:var(--s7)}.news h2{border-top:0;padding-top:0;margin-top:0;counter-increment:none}.news h2::before{content:none}
.news .content p{margin:0 0 12px}
.qa h2{font-size:22px;border-top:1px solid var(--ink-line)}
.article .qa:first-of-type h2{border-top:0}

/* ---------- sidebar ---------- */
.side-box{padding:0 0 var(--s5);margin-bottom:var(--s5);border-bottom:1px solid var(--ink-line);font-size:14px}
.side-box:last-of-type{border-bottom:0}
.side-box strong{display:block;font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--fg-2);margin-bottom:10px}
.side-box ul{list-style:none;margin:0;padding:0}.side-box li{padding:7px 0;border-bottom:1px dashed var(--ink-3)}.side-box li:last-child{border-bottom:0}
.side-box li a{color:var(--fg);text-decoration:none}.side-box li a:hover{color:var(--amber)}
.side-kv{width:100%;border-collapse:collapse;margin:0 0 8px;background:var(--paper);color:var(--paper-ink);border-radius:6px;overflow:hidden}
.side-kv th,.side-kv td{padding:7px 10px;border:0;border-bottom:1px solid color-mix(in oklch,var(--paper-ink) 12%,transparent);font-size:13px;text-align:left}
.side-kv tr:last-child th,.side-kv tr:last-child td{border-bottom:0}
.side-kv th{color:var(--paper-mute);font-weight:600;width:44%}
.side-link{display:inline-block;margin-top:6px;font-weight:700}

/* ---------- cards(wiki/guides 索引页仍用,但去掉图标、改纸面) ---------- */
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:14px;margin:var(--s6) 0}
.card{display:block;background:var(--paper);color:var(--paper-ink);border-radius:6px;padding:22px 22px 20px;text-decoration:none;box-shadow:0 18px 36px -24px oklch(0% 0 0/.8);transition:transform .25s var(--ease),box-shadow .25s var(--ease)}
.card:hover{transform:translateY(-3px);box-shadow:0 26px 44px -22px oklch(0% 0 0/.85);color:var(--paper-ink)}
.card h3{margin:0 0 8px;font-size:21px;color:var(--paper-ink);line-height:1.25}.card p{margin:0;color:var(--paper-mute);font-size:15px}.ico{display:none}
.ad-slot{margin:var(--s6) 0;min-height:90px;text-align:center}

/* ---------- footer ---------- */
.ftr{border-top:1px solid var(--ink-line);background:var(--ink-2);padding:var(--s7) 0 var(--s6);margin-top:var(--s9);font-size:14px;color:var(--fg-2);position:relative;z-index:1}
.ftr-cols{display:grid;grid-template-columns:2fr 1fr 1fr;gap:var(--s6)}@media(max-width:700px){.ftr-cols{grid-template-columns:1fr}}
.ftr strong{display:block;color:var(--fg);margin-bottom:10px;font-family:var(--font-display);font-size:16px}
.ftr a{display:block;color:var(--fg-2);padding:3px 0;text-decoration:none}.ftr a:hover{color:var(--amber)}
.ftr-note{margin-top:var(--s6);border-top:1px solid var(--ink-3);padding-top:16px;font-size:13px;max-width:80ch}