/* UBAN4D — 银发行云 silver-cloud hero + 卡片流. 银灰黑 #23262B × 月银 #C9D4E0 */
:root{
  --bg:#23262B;--panel:#2C313A;--panel2:#343A45;--text:#E8EDF4;--muted:#9DAAB9;
  --silver:#C9D4E0;--glow:0 0 12px rgba(201,212,224,.35),0 0 26px rgba(201,212,224,.18);
  --grad-panel:linear-gradient(150deg,#343A45 0%,#23262B 100%);
  --font-h:'Literata',serif;--font-b:'Atkinson Hyperlegible',sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--text);font-family:var(--font-b);line-height:1.8;font-size:17px}
img,svg{max-width:100%;vertical-align:middle}
a{color:var(--silver);text-decoration:none}
a:hover{text-decoration:underline}
.container{width:100%;max-width:1160px;margin:0 auto;padding:0 16px}
.container.narrow{max-width:840px}
.center{text-align:center}
.site-header{position:sticky;top:0;z-index:50;background:rgba(35,38,43,.94);backdrop-filter:blur(10px);border-bottom:1px solid rgba(201,212,224,.35)}
.header-in{display:flex;align-items:center;gap:14px;min-height:64px}
.brand{display:inline-flex;align-items:center;gap:8px;font-family:var(--font-h);font-weight:700;font-size:1.25rem;color:var(--text);white-space:nowrap}
.brand:hover{text-decoration:none}
.nav-desktop{display:none;margin-left:auto;gap:18px}
.nav-desktop a{color:var(--muted);font-weight:400;font-size:.98rem}
.nav-desktop a:hover{color:var(--silver);text-decoration:none}
.header-cta{display:flex;gap:8px;margin-left:auto}
.nav-desktop+.header-cta{margin-left:0}
.btn{display:inline-block;min-height:48px;padding:12px 24px;border-radius:12px;font-family:var(--font-b);font-weight:700;font-size:1rem;cursor:pointer;border:1px solid transparent;transition:transform .15s;line-height:1.4}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn-primary{background:linear-gradient(135deg,#DCE6F0,#C9D4E0);color:#23262B;box-shadow:var(--glow)}
.btn-secondary{background:transparent;color:var(--silver);border-color:rgba(201,212,224,.55)}
.pulse{animation:pulse-glow 2.4s infinite}
@keyframes pulse-glow{0%,100%{box-shadow:0 0 8px rgba(201,212,224,.35)}50%{box-shadow:0 0 22px rgba(201,212,224,.7)}}
.nav-toggle{display:none}
.burger{display:flex;flex-direction:column;gap:5px;cursor:pointer;padding:8px;margin-left:4px}
.burger span{width:24px;height:3px;background:var(--silver);border-radius:2px}
.m-nav{display:none;background:var(--panel);border-bottom:1px solid rgba(201,212,224,.3)}
.m-nav-group{padding:10px 16px}
.m-nav-group h3{font-family:var(--font-b);font-size:.85rem;text-transform:uppercase;letter-spacing:.08em;color:var(--silver);margin-bottom:6px;font-weight:700}
.m-nav-group a{display:block;padding:8px 0;color:var(--text)}
.nav-toggle:checked~.m-nav{display:block}
/* silver-cloud hero */
.cloud-hero{position:relative;padding:64px 0 46px;background:
  radial-gradient(60% 50% at 20% 0%,rgba(201,212,224,.14),transparent 70%),
  radial-gradient(50% 40% at 85% 20%,rgba(201,212,224,.10),transparent 70%),
  linear-gradient(180deg,#2C313A 0%,#23262B 100%);overflow:hidden;text-align:center}
.cloud-band{position:absolute;inset:auto 0 0 0;height:120px;pointer-events:none}
.cloud{position:absolute;bottom:-30px;border-radius:50%;background:radial-gradient(closest-side,rgba(201,212,224,.16),rgba(201,212,224,.05) 70%,transparent)}
.cloud.c1{left:6%;width:260px;height:120px;animation:drift 16s ease-in-out infinite alternate}
.cloud.c2{left:44%;width:340px;height:150px;animation:drift 22s ease-in-out infinite alternate-reverse}
.cloud.c3{right:5%;width:230px;height:110px;animation:drift 19s ease-in-out infinite alternate}
@keyframes drift{from{transform:translateX(-24px)}to{transform:translateX(24px)}}
.hero-title-wrap h1{font-family:var(--font-h);font-size:clamp(2.6rem,8vw,4.4rem);letter-spacing:.06em;color:var(--text);text-shadow:0 0 26px rgba(201,212,224,.45)}
.hero-sub{max-width:640px;margin:14px auto 24px;color:var(--muted);font-size:1.08rem}
.hero-cta{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.hero-chips{list-style:none;display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:24px}
.hero-chips li{border:1px solid rgba(201,212,224,.4);border-radius:999px;padding:6px 16px;font-size:.9rem;color:var(--silver)}
.section{padding:40px 0}
.section-alt{background:rgba(44,49,58,.55)}
.sec-title{font-family:var(--font-h);font-size:1.6rem;margin-bottom:18px;text-align:center}
.sec-sub{text-align:center;color:var(--muted);margin:-8px 0 18px}
.grid-3,.grid-4{display:grid;gap:16px;grid-template-columns:1fr;margin-bottom:8px}
.glow-card{display:block;background:var(--grad-panel);border:1px solid rgba(201,212,224,.35);border-radius:14px;padding:20px;color:var(--text);transition:border-color .15s,box-shadow .15s}
.glow-card:hover{border-color:var(--silver);box-shadow:var(--glow);text-decoration:none}
.glow-card h3{font-family:var(--font-h);font-size:1.12rem;margin-bottom:6px;color:var(--silver)}
.glow-card p{color:var(--muted);font-size:.96rem}
.nc-icon{font-size:1.6rem;display:block;margin-bottom:8px}
/* 大字模式对照卡 */
.compare-pair{display:grid;gap:16px;grid-template-columns:1fr;margin:18px 0;max-width:760px;margin-left:auto;margin-right:auto}
.compare-card{border-radius:14px;padding:22px;border:1px solid rgba(201,212,224,.35);background:var(--grad-panel)}
.compare-card .compare-tag{display:inline-block;font-size:.82rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin-bottom:10px;border:1px solid rgba(201,212,224,.3);border-radius:999px;padding:2px 12px}
.compare-card p{margin:0}
.compare-card.small p{font-size:15px;color:var(--muted)}
.compare-card.big{border-color:var(--silver);box-shadow:var(--glow)}
.compare-card.big .compare-tag{color:var(--silver)}
.compare-card.big p{font-size:23px;color:var(--text);font-weight:700}
.prose .note{color:var(--muted);font-size:.92rem}
.page-head{padding-top:22px}
.page-head h1,.prose h1{font-family:var(--font-h);font-size:clamp(1.7rem,4.5vw,2.3rem)}
.prose h2{font-family:var(--font-h);font-size:1.45rem;margin:28px 0 10px}
.prose h3{font-size:1.15rem;font-weight:700;margin:22px 0 8px;color:var(--silver)}
.prose p{margin:0 0 15px}
.prose ul,.prose ol{margin:0 0 15px 22px}
.prose li{margin-bottom:8px}
.steps li{margin-bottom:12px}
.steps li strong{color:var(--silver)}
.kamus-grid{display:grid;gap:10px;margin:14px 0}
.kamus-item{background:var(--grad-panel);border:1px solid rgba(201,212,224,.3);border-radius:10px;overflow:hidden}
.kamus-item summary{cursor:pointer;padding:14px 16px;font-weight:700;list-style:none;position:relative}
.kamus-item summary::-webkit-details-marker{display:none}
.kamus-item summary::after{content:"+";position:absolute;right:16px;color:var(--silver)}
.kamus-item[open] summary::after{content:"−"}
.kamus-item p{padding:0 16px 14px;color:var(--muted);font-size:.98rem}
.err-wrap{padding:70px 16px}
.err-code{font-family:var(--font-h);font-size:5rem;color:var(--silver);text-shadow:var(--glow)}
.err-wrap .btn{margin:18px 0}
.crumbs{padding:12px 0 0;font-size:.85rem;color:var(--muted)}
.crumbs ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px}
.crumbs li+li::before{content:"›";margin-right:6px;color:var(--silver)}
.site-footer{background:var(--panel);border-top:1px solid rgba(201,212,224,.35);padding:36px 0 100px;margin-top:30px}
.foot-grid{display:grid;gap:24px;grid-template-columns:1fr}
.foot-brand p{color:var(--muted);font-size:.92rem;margin:10px 0}
.foot-col h3{font-size:.9rem;text-transform:uppercase;letter-spacing:.08em;color:var(--silver);margin-bottom:8px;font-weight:700}
.foot-col a{display:block;color:var(--muted);padding:4px 0;font-size:.95rem}
.foot-col a:hover{color:var(--silver);text-decoration:none}
.pill-18{display:inline-block;border:1px solid var(--silver);color:var(--silver);border-radius:999px;padding:2px 12px;font-weight:700;font-size:.85rem}
.foot-bottom{margin-top:24px;padding-top:16px;border-top:1px solid rgba(201,212,224,.25);color:var(--muted);font-size:.88rem}
.float-cta{position:fixed;left:50%;bottom:calc(12px + env(safe-area-inset-bottom));transform:translateX(-50%);z-index:60;display:flex;align-items:center;justify-content:center;gap:12px;width:max-content;max-width:calc(100vw - 24px);padding:10px 12px;background:rgba(35,38,43,.94);backdrop-filter:blur(8px);border:1px solid rgba(201,212,224,.5);border-radius:14px;box-shadow:0 6px 24px rgba(0,0,0,.45)}
.float-cta-tag{font-family:var(--font-h);font-weight:700;font-size:.98rem;color:var(--silver);white-space:nowrap}
.float-cta .btn{white-space:nowrap;padding:11px 20px;animation:cta-blink 1.6s ease-in-out infinite}
@keyframes cta-blink{0%,100%{box-shadow:0 0 10px rgba(201,212,224,.45),0 0 22px rgba(201,212,224,.18);transform:scale(1)}50%{box-shadow:0 0 18px rgba(201,212,224,.9),0 0 40px rgba(201,212,224,.45);transform:scale(1.04)}}
@media (max-width:400px){.float-cta{gap:8px;padding:8px 10px}.float-cta .btn{padding:11px 16px}}
@media (max-width:360px){.float-cta-tag{font-size:.88rem}}
@media (min-width:768px){
  .grid-3{grid-template-columns:repeat(3,1fr)}
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .compare-pair{grid-template-columns:1fr 1fr}
  .foot-grid{grid-template-columns:2fr 1fr 1fr 1fr}
  .nav-desktop{display:flex}
  .header-cta{margin-left:0}
  .burger{display:none}
  .m-nav{display:none!important}
}
@media (min-width:1024px){.grid-4{grid-template-columns:repeat(4,1fr)}}
@media (prefers-reduced-motion:reduce){.pulse,.cloud,.float-cta .btn{animation:none}}