/* ============================================================
   笔枢 Novelbuilt · 站点共享样式（营销页：开发计划 / 免费工具 / 社群）
   tokens + 顶栏页签 + 页脚 + 基础排版，与首页保持一致
   ============================================================ */
:root,[data-theme="light"]{
  --paper:#FEFCF8;--paper-2:#F8F4EB;--paper-3:#F1E9DA;--card:#FFFFFF;
  --ink:#221D16;--ink-2:#5E5447;--ink-3:#938979;
  --line:rgba(34,29,22,.10);--line-2:rgba(34,29,22,.055);--grain:rgba(34,29,22,.022);
  --gold:oklch(0.70 0.125 70);--gold-deep:oklch(0.56 0.125 58);
  --gold-soft:oklch(0.92 0.045 78);--gold-wash:oklch(0.975 0.018 80);
  --terra:oklch(0.58 0.15 35);--terra-soft:oklch(0.93 0.05 40);
  --green:oklch(0.58 0.10 150);--green-soft:oklch(0.93 0.045 150);
  --shadow:rgba(34,29,22,.4);
}
[data-theme="dark"]{
  --paper:#17130E;--paper-2:#1F1A13;--paper-3:#2A2318;--card:#211B14;
  --ink:#F4EDE0;--ink-2:#BCB2A1;--ink-3:#897F6F;
  --line:rgba(244,237,224,.13);--line-2:rgba(244,237,224,.06);--grain:rgba(244,237,224,.018);
  --gold:oklch(0.80 0.13 75);--gold-deep:oklch(0.82 0.115 72);
  --gold-soft:oklch(0.42 0.07 70);--gold-wash:oklch(0.27 0.04 72);
  --terra:oklch(0.72 0.15 38);--terra-soft:oklch(0.34 0.07 38);
  --green:oklch(0.74 0.10 150);--green-soft:oklch(0.30 0.05 150);
  --shadow:rgba(0,0,0,.6);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
:root{--sans:"Noto Sans SC","PingFang SC",system-ui,sans-serif;--serif:"Noto Serif SC","Songti SC",serif;--latin:"Newsreader",Georgia,serif;--mono:ui-monospace,"SF Mono","JetBrains Mono",monospace;--maxw:1140px;--ease:cubic-bezier(.2,.7,.2,1)}
body{font-family:var(--sans);background:var(--paper);color:var(--ink);line-height:1.6;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;overflow-x:hidden;transition:background .5s var(--ease),color .5s var(--ease)}
body::before{content:"";position:fixed;inset:0;pointer-events:none;z-index:0;opacity:.6;background-image:radial-gradient(var(--grain) 1px,transparent 1px);background-size:4px 4px}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 32px}
a{color:inherit;text-decoration:none}
section{position:relative;z-index:1}
::selection{background:var(--gold-soft);color:var(--ink)}
em{font-style:normal;color:var(--gold-deep)}
strong{font-weight:600;color:var(--ink)}

/* ---------- nav (page tabs) ---------- */
.nav{position:fixed;top:0;left:0;right:0;z-index:50;transition:background .4s var(--ease),border-color .4s,backdrop-filter .4s}
.nav.scrolled{background:color-mix(in srgb,var(--paper) 82%,transparent);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.nav-inner{max-width:var(--maxw);margin:0 auto;padding:16px 32px;display:flex;align-items:center;justify-content:space-between;gap:18px}
.brand{display:flex;align-items:baseline;gap:10px}
.brand .cn{font-family:var(--serif);font-weight:600;font-size:23px;letter-spacing:.04em}
.brand .en{font-family:var(--latin);font-style:italic;font-size:13px;letter-spacing:.18em;text-transform:uppercase;color:var(--ink-3)}
.nav-links{display:flex;align-items:center;gap:28px}
.nav-links a:not(.btn){font-size:14.5px;color:var(--ink-2);position:relative;transition:color .25s;white-space:nowrap}
/* desktop：文字页签靠左，登录/进入控制台两枚按钮推到最右 */
@media(min-width:921px){
  .nav-links{flex:1}
  .nav-links a.btn-ghost{margin-left:auto}
  .nav-links a.btn-primary{margin-left:-18px}
}
.nav-links a:not(.btn)::after{content:"";position:absolute;left:0;bottom:-5px;width:0;height:1.5px;background:var(--gold-deep);transition:width .3s var(--ease)}
.nav-links a:not(.btn):hover{color:var(--ink)}
.nav-links a:not(.btn):hover::after{width:100%}
.nav-links a.active{color:var(--ink);font-weight:500}
.nav-links a.active::after{width:100%;background:var(--gold)}
.nav-tools{display:flex;align-items:center;gap:8px}
.icon-btn{width:38px;height:38px;display:grid;place-items:center;border-radius:50%;border:1px solid var(--line);background:transparent;color:var(--ink-2);cursor:pointer;transition:all .25s var(--ease);font-family:var(--sans);font-size:13px;font-weight:600}
.icon-btn:hover{border-color:var(--ink-3);color:var(--ink);background:var(--card)}
.icon-btn.lang-seg{width:auto;padding:3px;border-radius:999px;display:inline-flex;align-items:center;gap:0}
.icon-btn.lang-seg i{font-style:normal;font-size:11.5px;font-weight:600;line-height:1.2;padding:5px 9px;border-radius:999px;color:var(--ink-3);transition:all .25s}
.icon-btn.lang-seg i.on{background:var(--ink);color:var(--paper)}
.btn{display:inline-flex;align-items:center;gap:8px;font-size:14.5px;font-weight:500;padding:9px 18px;border-radius:999px;transition:all .25s var(--ease);white-space:nowrap;cursor:pointer}
.btn-primary{background:var(--ink);color:var(--paper)}
.btn-primary:hover{background:var(--gold-deep);color:var(--paper);transform:translateY(-1px);box-shadow:0 8px 22px -8px var(--gold-deep)}
.btn-ghost{border:1px solid var(--line);color:var(--ink)}
.btn-ghost:hover{border-color:var(--ink);background:var(--card)}
.btn-lg{padding:14px 28px;font-size:15.5px}
/* signed-in: push 进入控制台 to the right edge of the link row, avatar lives in nav-tools */
.nav-links a.btn-primary.nav-cta-right{margin-left:auto}
#lf-nav-av{display:inline-flex;align-items:center}
.menu-btn{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:8px}
.menu-btn span{width:22px;height:2px;background:var(--ink);transition:.3s;border-radius:2px}

/* ---------- subpage hero ---------- */
.phero{padding:148px 0 30px;position:relative}
.phero .kicker{margin-bottom:18px}
.phero h1{font-family:var(--serif);font-weight:600;font-size:clamp(2.1rem,4.4vw,3.5rem);line-height:1.16;letter-spacing:-.01em;margin-bottom:18px}
.phero h1 em{font-style:normal;color:var(--gold-deep)}
.phero .lead{font-size:clamp(1rem,1.5vw,1.18rem);color:var(--ink-2);max-width:40em}

/* ---------- section primitives ---------- */
.sec{padding:60px 0;position:relative;z-index:1}
.sec-head{max-width:720px;margin-bottom:44px}
.kicker{display:inline-flex;align-items:center;gap:9px;font-size:12.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--gold-deep);font-family:var(--latin);font-weight:500}
.kicker .bar{width:24px;height:1.5px;background:var(--gold)}
.sec h2{font-family:var(--serif);font-weight:600;font-size:clamp(1.7rem,3.2vw,2.5rem);line-height:1.2;letter-spacing:-.01em;margin-bottom:14px}
.sec h2 em{font-style:normal;color:var(--gold-deep)}
.sec .sub{font-size:1.04rem;color:var(--ink-2);max-width:44em}
.tint{background:var(--paper-2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .8s var(--ease),transform .8s var(--ease)}
.reveal.in{opacity:1;transform:none}
.reveal.d1{transition-delay:.08s}.reveal.d2{transition-delay:.16s}.reveal.d3{transition-delay:.24s}.reveal.d4{transition-delay:.32s}.reveal.d5{transition-delay:.4s}

/* ---------- footer ---------- */
footer{border-top:1px solid var(--line);padding:54px 0 36px;background:var(--paper-2);position:relative;z-index:1}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px;margin-bottom:42px}
.foot-grid h5{font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-3);margin-bottom:16px;font-weight:600}
.foot-grid a{display:block;font-size:14px;color:var(--ink-2);margin-bottom:11px;transition:color .2s}
.foot-grid a:hover{color:var(--gold-deep)}
.foot-brand p{font-size:14px;color:var(--ink-2);max-width:24em;margin-top:14px}
.foot-bot{display:flex;justify-content:space-between;align-items:center;padding-top:24px;border-top:1px solid var(--line);font-size:13px;color:var(--ink-3);flex-wrap:wrap;gap:14px}
.foot-bot .motto{font-family:var(--latin);font-style:italic}

/* ---------- responsive nav ---------- */
@media(max-width:920px){
  .nav-links{position:fixed;inset:0 0 auto 0;flex-direction:column;background:var(--paper);padding:88px 32px 40px;gap:20px;align-items:flex-start;transform:translateY(-100%);transition:transform .4s var(--ease);box-shadow:0 20px 50px -20px var(--shadow);border-bottom:1px solid var(--line)}
  .nav-links.open{transform:none}
  .menu-btn{display:flex;z-index:60}
}
@media(max-width:680px){
  .wrap{padding:0 22px}
  .nav-inner{padding:13px 22px}
  .phero{padding:120px 0 20px}
  .sec{padding:48px 0}
  .foot-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:480px){.foot-grid{grid-template-columns:1fr}}
@media(prefers-reduced-motion:reduce){
  *{animation:none!important}
  .reveal{opacity:1;transform:none;transition:none}
}