/* 一字一世界 · 站点样式。封面区用星空+金；正文暖白、大字、清楚的按钮（老师会长时间看）。 */
:root{
  --night:#0b1020;--night2:#141b33;--gold:#d8b25a;--gold2:#f0d48a;--paper:#faf6ee;--paper2:#f1ebdd;
  --ink:#1e1b16;--ink2:#4a453c;--dim:#7a7468;--line:#e2dccb;--white:#fff;--ok:#2e7d4f;--warn:#b26a00;
  --r:14px;--gutter:16px;--maxw:1080px;
  --serif:"Songti SC","Noto Serif SC","Source Han Serif SC","SimSun",serif;
  --sans:-apple-system,"PingFang SC","Hiragino Sans GB","Noto Sans SC","Microsoft YaHei",sans-serif;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){--paper:#15171c;--paper2:#1d2028;--ink:#ece6d8;--ink2:#c9c2b3;--dim:#8f897c;--line:#2b2f3a;--white:#1b1e26}}
:root[data-theme="dark"]{--paper:#15171c;--paper2:#1d2028;--ink:#ece6d8;--ink2:#c9c2b3;--dim:#8f897c;--line:#2b2f3a;--white:#1b1e26}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font:17px/1.75 var(--sans);overflow-x:hidden}
a{color:inherit;text-decoration:none}img,video{max-width:100%;display:block}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 var(--gutter)}
h1,h2,h3{font-family:var(--serif);font-weight:700;line-height:1.3;margin:0 0 12px}
h1{font-size:clamp(28px,5vw,44px)}h2{font-size:clamp(22px,3.4vw,30px);margin-top:8px}h2 small{font-family:var(--sans);font-weight:400;font-size:14px;color:var(--dim);margin-left:8px}
h3{font-size:19px;margin-top:22px}
section{padding:36px 0}
.note{color:var(--dim);font-size:15px}.note a{color:var(--warn);border-bottom:1px solid}
.kicker{color:var(--gold);letter-spacing:.12em;font-size:13px;margin:0 0 8px;text-transform:uppercase}
.lede{font-size:18px;color:var(--ink2);margin:0 0 18px}
.btn{display:inline-block;padding:12px 22px;border-radius:999px;font-weight:600;border:2px solid var(--gold);color:var(--gold);background:transparent;cursor:pointer;font-size:16px;line-height:1.3;font-family:var(--sans)}
.btn.gold{background:var(--gold);color:var(--night)}.btn.ghost{color:var(--ink);border-color:var(--ink2)}
.hero .btn.ghost,.dark .btn.ghost{color:#fff;border-color:rgba(255,255,255,.7)}
.cta{display:flex;gap:12px;flex-wrap:wrap;margin:8px 0 14px}

/* 品牌导航条 + 顶栏 */
.brandbar{background:var(--night);color:#cfc7b3;font-size:13px}
.brandbar .wrap{display:flex;justify-content:space-between;align-items:center;height:34px;gap:10px}
.bb-r{display:flex;gap:14px;white-space:nowrap;overflow:auto}.bb-r a{opacity:.8}.bb-r a.cur{color:var(--gold);opacity:1}
.top{background:var(--night2);color:#fff;position:sticky;top:0;z-index:20;border-bottom:1px solid rgba(255,255,255,.08)}
.top .wrap{display:flex;align-items:center;justify-content:space-between;height:60px}
.logo{font-family:var(--serif);font-size:24px;letter-spacing:.08em;display:flex;flex-direction:column;line-height:1.1}.logo .zh{white-space:nowrap}
.logo b{color:var(--gold);font-weight:600}.logo small{font-family:var(--sans);font-size:11px;letter-spacing:.14em;color:#9aa1b5;margin-top:2px}
.nav{display:flex;gap:22px;font-size:16px}.nav a.on{color:var(--gold)}
.menu{display:none;background:none;border:0;color:#fff;font-size:24px;padding:6px}
@media (max-width:720px){.menu{display:block}.nav{display:none;position:absolute;left:0;right:0;top:60px;background:var(--night2);flex-direction:column;gap:0;padding:6px 16px 12px}.nav a{padding:10px 0;border-top:1px solid rgba(255,255,255,.08)}body.nav-open .nav{display:flex}}

/* 首页 hero */
.hero{background:radial-gradient(1200px 600px at 70% -10%,#2a3563 0%,var(--night) 55%);color:#fff;padding:44px 0 40px}
.hero .wrap{display:grid;grid-template-columns:1.1fr 1fr;gap:32px;align-items:center}
@media (max-width:820px){.hero .wrap{grid-template-columns:1fr}}
.hero h1{color:#fff}.hero .lede{color:#cfd3e0}
.motto{font-family:var(--serif);color:var(--gold2);margin:0}.motto i{display:block;font-style:italic;font-family:Georgia,serif;font-size:14px;color:#9aa1b5}
.h-video{position:relative;display:block;border-radius:var(--r);overflow:hidden;box-shadow:0 20px 50px rgba(0,0,0,.45)}
.h-video img{width:100%;aspect-ratio:2/1;object-fit:cover}
.h-video .play{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);width:68px;height:68px;border-radius:50%;background:var(--gold);color:var(--night);display:grid;place-items:center;font-size:26px;padding-left:5px}
.h-video .cap{position:absolute;left:0;right:0;bottom:0;padding:10px 14px;background:linear-gradient(transparent,rgba(0,0,0,.75));font-size:14px;color:#fff}

/* 两个入口 */
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:16px}@media (max-width:720px){.grid2{grid-template-columns:1fr}}
.door{display:flex;flex-direction:column;gap:8px;background:var(--white);border:1px solid var(--line);border-radius:var(--r);padding:22px 20px;box-shadow:0 4px 18px rgba(0,0,0,.04)}
.door b{font-family:var(--serif);font-size:22px}.door span{color:var(--ink2);font-size:15px}.door i{color:var(--gold);font-style:normal;font-weight:600;margin-top:auto}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:8px 0 20px}@media (max-width:720px){.grid3{grid-template-columns:1fr}}
.box{background:var(--white);border:1px solid var(--line);border-radius:var(--r);padding:18px}.box b{display:block;margin-bottom:4px}.box span{color:var(--ink2);font-size:15px}
.plain{padding-left:20px;color:var(--ink2)}

/* 字库 */
.zi-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:12px;margin:10px 0}
.zi-card{background:var(--white);border:1px solid var(--line);border-radius:var(--r);padding:16px 10px;text-align:center;display:flex;flex-direction:column;gap:6px}
.zi-card .glyph{font-family:var(--serif);font-size:54px;line-height:1;color:var(--ink)}
.zi-card .st{font-size:13px;color:var(--dim)}.zi-card.ready{border-color:var(--gold)}.zi-card.ready .st{color:var(--warn)}.zi-card.soon{opacity:.55}
.zi-list{display:flex;flex-direction:column;gap:10px}
.zi-row{display:grid;grid-template-columns:70px 1fr auto;align-items:center;gap:14px;background:var(--white);border:1px solid var(--line);border-radius:var(--r);padding:14px 16px}
.zi-row .glyph{font-family:var(--serif);font-size:44px;text-align:center}.zi-row b{display:block}.zi-row span{color:var(--dim);font-size:14px}.zi-row i{color:var(--warn);font-style:normal;font-weight:600}.zi-row.soon{opacity:.6}
.tb{width:100%;border-collapse:collapse;background:var(--white);border:1px solid var(--line);border-radius:var(--r);overflow:hidden;font-size:15px}
.tb th,.tb td{padding:11px 12px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}.tb th{background:var(--paper2);font-weight:600}
@media (max-width:600px){.tb{display:block;overflow-x:auto;white-space:nowrap}}

/* 页头 */
.pagehead{background:var(--paper2);padding:34px 0 22px}.pagehead p{color:var(--ink2);margin:0;max-width:720px}
.pagehead.dark{background:radial-gradient(900px 400px at 20% -20%,#2a3563,var(--night) 60%);color:#fff}.pagehead.dark h1{color:#fff}.pagehead.dark p{color:#cfd3e0}

/* 字详情 */
.zhead{background:radial-gradient(900px 500px at 80% -10%,#2a3563,var(--night) 60%);color:#fff;padding:36px 0 28px}
.zhead .wrap{display:grid;grid-template-columns:auto 1fr;gap:26px;align-items:center}
.zh-l{display:flex;align-items:baseline;gap:10px;font-family:var(--serif)}.zh-l .big{font-size:clamp(88px,16vw,150px);line-height:1;color:var(--gold2)}.zh-l .trad{font-size:34px;color:#9aa1b5}
.zhead h1{color:#fff}.zhead .lede{color:#cfd3e0;margin-bottom:10px}
.tags{display:flex;gap:8px;flex-wrap:wrap}.tags span{border:1px solid rgba(255,255,255,.3);border-radius:999px;padding:3px 12px;font-size:13px;color:#dfe3ee}
@media (max-width:640px){.zhead .wrap{grid-template-columns:1fr}}
.player{background:var(--night);padding:0 0 22px}.player video{width:100%;aspect-ratio:16/9;background:#000;border-radius:0 0 var(--r) var(--r)}
.vbar{display:flex;gap:14px;align-items:center;flex-wrap:wrap;margin-top:14px}.vnote{color:#9aa1b5;font-size:14px}
.goal-list{padding-left:22px;font-size:18px}.goal-list li{margin:6px 0}
.switch{display:inline-flex;background:var(--paper2);border-radius:999px;padding:4px;margin-bottom:14px}
.switch button{border:0;background:transparent;padding:9px 20px;border-radius:999px;font-size:16px;font-family:var(--sans);color:var(--ink2);cursor:pointer}.switch button.on{background:var(--night);color:var(--gold2)}
.intro{color:var(--ink2);margin:0 0 10px}
.steps{counter-reset:s;list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:10px}
.steps li{counter-increment:s;display:grid;grid-template-columns:38px 1fr;gap:10px;background:var(--white);border:1px solid var(--line);border-radius:var(--r);padding:14px 16px}
.steps li::before{content:counter(s);width:30px;height:30px;border-radius:50%;background:var(--gold);color:var(--night);display:grid;place-items:center;font-weight:700}
.steps b{display:block}.steps span{color:var(--ink2);font-size:15px;grid-column:2}
.qa{padding-left:20px}.qa li{margin:10px 0}.qa b{display:block}.qa span{color:var(--ink2);font-size:15px}
.talk{padding-left:20px;color:var(--ink2)}
.mats{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:10px}
.mat{display:flex;flex-direction:column;gap:4px;background:var(--white);border:1px solid var(--line);border-radius:var(--r);padding:14px 16px;position:relative}
.mat span{color:var(--dim);font-size:14px}.mat i{position:absolute;right:12px;top:12px;font-style:normal;font-size:12px;border-radius:999px;padding:2px 10px}
.mat.ready i{background:var(--gold);color:var(--night)}.mat.pending i{background:var(--paper2);color:var(--dim)}.mat.pending{opacity:.75}
.evo-list{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:10px}
.evo-list li{background:var(--white);border:1px solid var(--line);border-radius:var(--r);padding:14px;display:flex;flex-direction:column;gap:4px;position:relative}
.evo-list b{font-family:var(--serif);font-size:20px;color:var(--warn)}.evo-list .tt{font-weight:600}.evo-list span{font-size:14px;color:var(--ink2)}
.evo-list em{font-style:normal;font-size:12px;align-self:flex-start;border-radius:999px;padding:1px 9px;margin-top:6px}
.evo-list li.story em{background:#eef1fb;color:#3b4a8f}.evo-list li.fact em{background:#e9f5ee;color:var(--ok)}
.src-list{padding-left:20px}.src-list li{margin:6px 0}.src-list a{color:var(--warn);border-bottom:1px solid}.src-list span{display:block;color:var(--dim);font-size:14px}

/* 会员 */
.tiers{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px}
.tier{background:var(--white);border:1px solid var(--line);border-radius:var(--r);padding:20px;display:flex;flex-direction:column;gap:8px;position:relative}
.tier b{font-family:var(--serif);font-size:21px}.tier .price{font-size:26px;font-weight:700}.tier ul{padding-left:18px;margin:0 0 8px;color:var(--ink2);font-size:15px;flex:1}
.tier.open{border-color:var(--gold);box-shadow:0 8px 24px rgba(216,178,90,.18)}.tier i{position:absolute;right:14px;top:14px;font-style:normal;font-size:12px;color:var(--dim)}

/* 留资 */
.lead{background:var(--night);color:#fff}.lead h2{color:#fff}.lead .sub{color:#cfd3e0;margin-top:0}
.leadform .row{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:14px}@media (max-width:640px){.leadform .row{grid-template-columns:1fr}}
.leadform label{display:flex;flex-direction:column;gap:4px;font-size:14px;color:#cfd3e0}.leadform label.wide{grid-column:1/-1}
.leadform input,.leadform select{font:16px var(--sans);padding:11px 12px;border-radius:10px;border:1px solid rgba(255,255,255,.2);background:rgba(255,255,255,.06);color:#fff}
.leadform .hp{position:absolute;left:-9999px}.leadform .msg{margin-left:12px;font-size:15px;color:var(--gold2)}
.prose p{max-width:760px}

/* 页脚 */
.foot{background:var(--night);color:#9aa1b5;padding:34px 0 28px;font-size:14px}
.f-brand{color:#fff;font-family:var(--serif);font-size:18px;margin-bottom:14px}.f-brand span{font-family:var(--sans);font-size:13px;color:#9aa1b5}
.f-sites{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:8px 18px;margin-bottom:16px}.f-sites a{color:var(--gold2)}.f-sites i{display:block;font-style:normal;font-size:12px}
.f-copy{border-top:1px solid rgba(255,255,255,.1);padding-top:14px}
/* 视频分段 */
.chap{border:1px solid rgba(255,255,255,.35);background:transparent;color:#fff;border-radius:999px;padding:8px 14px;font:14px var(--sans);cursor:pointer}
.chap:hover{border-color:var(--gold);color:var(--gold2)}
.player .vnote{margin:10px 0 0}