/* ============================================================
   邀请函官网 ·「鎏金信笺」Gilded Letterpress
   宣纸颗粒底 / 深茶墨 / 烫金发丝线 / 朱砂印章 / 宋黑混排
   ============================================================ */
:root{
  --paper:#f6f1e6;
  --paper-2:#f1e9d8;
  --paper-3:#e9dfc9;
  --card:#fdfaf2;
  --ink:#241d13;
  --ink-2:#4a3f30;
  --ink-3:#7a6c55;
  --ink-4:#a89878;
  --gold:#a9803f;
  --gold-2:#c8a45d;
  --gold-3:#e2cb94;
  --line:rgba(169,128,63,.32);
  --cinnabar:#9c3a2e;
  --shadow:0 18px 44px -18px rgba(70,54,28,.28);
  --serif:"Noto Serif SC","Source Han Serif SC","Songti SC","STSong","SimSun",serif;
  --latin:"Cormorant Garamond",Georgia,"Times New Roman",serif;
  --sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Helvetica Neue","Microsoft YaHei",sans-serif;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--paper);color:var(--ink-2);font-family:var(--sans);line-height:1.75;
  background-image:
    radial-gradient(1200px 500px at 80% -8%,rgba(200,164,93,.14),transparent 60%),
    radial-gradient(900px 480px at -10% 30%,rgba(156,58,46,.045),transparent 55%),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0.38 0 0 0 0 0.30 0 0 0 0 0.18 0 0 0 0.05 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
a{color:inherit;text-decoration:none}
img{max-width:100%}
.serif{font-family:var(--serif)}
::selection{background:rgba(200,164,93,.32)}

/* 发丝线 + 菱形饰件 */
.rule-d{display:flex;align-items:center;justify-content:center;gap:10px}
.rule-d::before,.rule-d::after{content:"";width:54px;height:1px;background:linear-gradient(90deg,transparent,var(--gold));}
.rule-d::after{background:linear-gradient(90deg,var(--gold),transparent)}
.rule-d i{font-style:normal;color:var(--gold);font-size:9px;transform:rotate(45deg)}

/* ---------- 导航 ---------- */
.nav{position:sticky;top:0;z-index:100;background:rgba(246,241,230,.88);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.nav-inner{max-width:1180px;margin:0 auto;padding:15px 32px;display:flex;align-items:center;justify-content:space-between}
.brand{display:flex;align-items:baseline;gap:11px;font-size:23px;font-weight:700;letter-spacing:6px;color:var(--ink);font-family:var(--serif);position:relative;padding-left:15px}
.brand::before{content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);width:5px;height:24px;background:linear-gradient(180deg,var(--gold-2),var(--gold));border-radius:1px}
.brand em{font-style:normal;font-family:var(--latin);font-size:10px;letter-spacing:3.5px;color:var(--gold);font-weight:500}
.nav-links{display:flex;align-items:center;gap:30px;font-size:14px;color:var(--ink-3);letter-spacing:2px}
.nav-links a{position:relative;padding:4px 0;transition:color .2s}
.nav-links a:not(.nav-cta):not(.nav-user)::after{content:"";position:absolute;left:50%;bottom:0;width:0;height:1px;background:var(--gold);transition:all .25s;transform:translateX(-50%)}
.nav-links a:not(.nav-cta):not(.nav-user):hover{color:var(--ink)}
.nav-links a:not(.nav-cta):not(.nav-user):hover::after{width:100%}
.nav-links a.on{color:var(--ink)}
.nav-links a.on::after{width:100%}
.nav-cta{padding:9px 22px;background:var(--ink);color:var(--paper)!important;font-size:13px;letter-spacing:3px;font-family:var(--serif);border:1px solid var(--ink);transition:all .25s}
.nav-cta:hover{background:transparent;color:var(--ink)!important}
.nav-user{display:inline-flex!important;align-items:center;gap:8px;max-width:160px;color:var(--ink)!important;letter-spacing:0}
.nav-user::after{display:none}
.nav-avatar{width:30px;height:30px;border-radius:50%;object-fit:cover;border:1.5px solid var(--gold-2);padding:1.5px;background:var(--card);flex:none}
.nav-nickname{font-size:13.5px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:96px}

/* ---------- 按钮 ---------- */
.btn-solid,.btn-primary{
  display:inline-block;padding:15px 40px;background:var(--ink);color:var(--paper);font-size:14.5px;letter-spacing:5px;
  border:1px solid var(--ink);border-radius:0;font-family:var(--serif);cursor:pointer;position:relative;overflow:hidden;transition:all .3s;
}
.btn-solid::after{content:"";position:absolute;top:0;left:-80%;width:50%;height:100%;background:linear-gradient(100deg,transparent,rgba(226,203,148,.35),transparent);transform:skewX(-20deg);transition:left .6s}
.btn-solid:hover{background:#000;box-shadow:0 12px 26px -10px rgba(36,29,19,.55)}
.btn-solid:hover::after{left:130%}
.btn-line{display:inline-block;padding:14px 38px;background:transparent;color:var(--ink);border:1px solid var(--ink);font-size:14.5px;letter-spacing:5px;border-radius:0;font-family:var(--serif);cursor:pointer;transition:all .3s}
.btn-line:hover{background:var(--ink);color:var(--paper)}
.btn-primary{padding:12px 30px;font-size:14px;letter-spacing:3px}

/* ---------- Hero ---------- */
.hero{max-width:1180px;margin:0 auto;padding:92px 32px 70px;position:relative}
.hero-inner{text-align:center;position:relative;z-index:1}
.hero-seal{display:inline-flex;align-items:center;gap:12px;margin-bottom:30px;animation:rise .8s both}
.hero-seal .seal{width:38px;height:38px;background:var(--cinnabar);color:#f7ecd6;font-family:var(--serif);font-size:19px;display:flex;align-items:center;justify-content:center;border-radius:4px;letter-spacing:0;box-shadow:0 4px 12px rgba(156,58,46,.35);transform:rotate(-4deg)}
.hero-seal .seal-line{width:46px;height:1px;background:var(--gold)}
.kicker{font-size:11px;letter-spacing:6px;color:var(--gold);font-weight:500;font-family:var(--latin)}
.hero h1{font-size:62px;font-weight:700;line-height:1.18;color:var(--ink);margin:22px 0 26px;letter-spacing:10px;font-family:var(--serif);animation:rise .8s .08s both}
.hero h1 em{display:block;font-style:normal;font-family:var(--latin);font-size:21px;font-weight:500;color:var(--ink-3);letter-spacing:7px;margin-top:18px}
.hero .lead{font-size:16px;color:var(--ink-2);max-width:580px;margin:0 auto 40px;letter-spacing:1.5px;animation:rise .8s .16s both}
.hero-cta{display:flex;gap:18px;justify-content:center;margin-bottom:54px;animation:rise .8s .24s both}
.hero-meta{display:flex;justify-content:center;gap:0;font-size:13px;color:var(--ink-3);letter-spacing:2px;animation:rise .8s .32s both}
.hero-meta span{padding:0 26px;position:relative}
.hero-meta span+span::before{content:"";position:absolute;left:0;top:50%;width:1px;height:13px;background:var(--line);transform:translateY(-50%)}
.hero-meta b{font-size:24px;color:var(--gold);font-weight:600;font-family:var(--latin);margin-right:7px}
.hero-ghost{position:absolute;top:38px;right:0;font-family:var(--latin);font-size:150px;line-height:1;color:rgba(169,128,63,.07);font-weight:600;user-select:none;pointer-events:none}
@keyframes rise{from{opacity:0;transform:translateY(26px)}to{opacity:1;transform:translateY(0)}}

/* ---------- 章节头 ---------- */
.sec-hd{max-width:1180px;margin:0 auto 46px;padding:0 32px;display:flex;align-items:flex-end;gap:18px;position:relative}
.sec-hd .no{font-size:13px;color:var(--gold);letter-spacing:2px;font-weight:600;padding-bottom:10px;font-family:var(--latin)}
.sec-hd h2{margin:0;font-size:31px;font-weight:700;color:var(--ink);letter-spacing:6px;padding-bottom:10px;position:relative;font-family:var(--serif)}
.sec-hd h2::after{content:"";position:absolute;left:0;bottom:-1px;width:46px;height:2px;background:linear-gradient(90deg,var(--gold-2),transparent)}
.sec-hd em{font-style:normal;font-family:var(--latin);font-size:11px;letter-spacing:4px;color:var(--ink-4);margin-left:auto;padding-bottom:14px;text-transform:uppercase}

/* ---------- 主推模板（大幅编辑风） ---------- */
.signature{padding:78px 0 30px;background:linear-gradient(180deg,transparent,rgba(233,223,201,.5) 18%,rgba(233,223,201,.5) 82%,transparent)}
.sig-inner{max-width:1180px;margin:0 auto;padding:0 32px;display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.sig-cover{position:relative}
.sig-cover .sig-img{aspect-ratio:4/4.6;background:var(--paper-3) center/cover no-repeat;display:block;box-shadow:var(--shadow)}
.sig-cover::before{content:"";position:absolute;left:14px;top:14px;right:-14px;bottom:-14px;border:1px solid var(--gold);z-index:-1}
.sig-cover .sig-tag{position:absolute;left:-12px;top:26px;background:var(--ink);color:var(--gold-3);font-size:11px;letter-spacing:4px;padding:8px 18px;font-family:var(--serif)}
.sig-text .sig-k{font-family:var(--latin);font-size:12px;letter-spacing:4px;color:var(--gold);margin-bottom:16px}
.sig-text h3{margin:0 0 8px;font-size:38px;letter-spacing:6px;color:var(--ink);font-family:var(--serif);font-weight:700;line-height:1.25}
.sig-text .sig-en{font-family:var(--latin);font-size:15px;letter-spacing:3px;color:var(--ink-4);margin-bottom:26px}
.sig-text p{font-size:15px;color:var(--ink-2);margin:0 0 28px;letter-spacing:.8px}
.sig-points{list-style:none;margin:0 0 34px;padding:0;border-top:1px solid var(--line)}
.sig-points li{display:flex;align-items:baseline;gap:14px;padding:13px 2px;border-bottom:1px solid rgba(169,128,63,.18);font-size:14.5px;color:var(--ink-2)}
.sig-points li b{font-family:var(--latin);color:var(--gold);font-size:15px;font-weight:600;letter-spacing:1px}
.sig-points li span{color:var(--ink-3);font-size:13px;margin-left:auto;letter-spacing:1px}
.sig-cta{display:flex;gap:14px;flex-wrap:wrap}

/* 分类小条 */
.cat-strip{max-width:1180px;margin:0 auto;padding:0 32px 10px;display:flex;gap:12px;flex-wrap:wrap}
.cat-pill{border:1px solid var(--line);background:rgba(253,250,242,.6);padding:9px 22px;font-size:13.5px;letter-spacing:3px;color:var(--ink-3);font-family:var(--serif);transition:all .25s;display:inline-flex;align-items:center;gap:8px}
.cat-pill i{font-style:normal;width:5px;height:5px;background:var(--gold-2);transform:rotate(45deg)}
.cat-pill:hover,.cat-pill.on{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.cat-pill.muted{opacity:.45;pointer-events:none}

/* ---------- 模板网格（保留，未来多模板） ---------- */
.tpl-sec{padding:64px 0}
.tpl-grid{max-width:1180px;margin:0 auto;padding:0 32px;display:grid;grid-template-columns:repeat(auto-fill,minmax(270px,1fr));gap:28px}
.tpl-card{display:block;background:var(--card);overflow:hidden;transition:all .3s;border:1px solid rgba(169,128,63,.22);position:relative}
.tpl-card:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:var(--gold)}
.tpl-card::after{content:"使用此模板";position:absolute;left:50%;top:calc(50% - 26px);transform:translate(-50%,10px);background:var(--ink);color:var(--paper);font-family:var(--serif);font-size:13px;letter-spacing:4px;padding:11px 26px;opacity:0;transition:all .3s;pointer-events:none}
.tpl-card:hover::after{opacity:1;transform:translate(-50%,0)}
.tpl-cover{width:100%;aspect-ratio:4/3;background:var(--paper-3) center/cover no-repeat}
.tpl-info{padding:18px 20px 20px;border-top:1px solid rgba(169,128,63,.18)}
.tpl-info h4{margin:0 0 5px;font-size:17px;color:var(--ink);letter-spacing:2px;font-family:var(--serif)}
.tpl-info span{font-size:11.5px;color:var(--gold);letter-spacing:2.5px;font-family:var(--latin);text-transform:uppercase}
.tpl-skel{grid-column:1/-1;text-align:center;padding:70px;color:var(--ink-3)}

/* ---------- 制作流程 ---------- */
.flow-sec{padding:84px 0}
.flow-grid{max-width:1180px;margin:0 auto;padding:0 32px;display:grid;grid-template-columns:repeat(3,1fr);gap:0;counter-reset:step}
.flow-item{padding:40px 34px;position:relative;border-top:2px solid var(--ink)}
.flow-item+ .flow-item{border-left:1px solid var(--line)}
.flow-item .f-num{font-family:var(--latin);font-size:46px;font-weight:600;color:transparent;-webkit-text-stroke:1px var(--gold);line-height:1;margin-bottom:20px}
.flow-item h3{margin:0 0 12px;font-size:20px;color:var(--ink);letter-spacing:3px;font-family:var(--serif)}
.flow-item p{margin:0;font-size:14px;color:var(--ink-3);line-height:1.9}
.flow-item::after{content:"";position:absolute;top:-6px;left:0;width:10px;height:10px;background:var(--gold-2);transform:rotate(45deg)}

/* ---------- 功能 ---------- */
.feat-sec{padding:70px 0 90px}
.feat-grid{max-width:1180px;margin:0 auto;padding:0 32px;display:grid;grid-template-columns:repeat(4,1fr);gap:26px}
.feat{padding:34px 26px;background:var(--card);border:1px solid rgba(169,128,63,.2);position:relative;transition:all .3s}
.feat:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:rgba(169,128,63,.5)}
.feat .f-ico{width:42px;height:42px;border:1px solid var(--gold);color:var(--gold);display:flex;align-items:center;justify-content:center;font-family:var(--serif);font-size:18px;margin-bottom:20px;transform:rotate(45deg)}
.feat .f-ico span{transform:rotate(-45deg)}
.feat h3{margin:0 0 10px;font-size:18px;color:var(--ink);letter-spacing:2px;font-family:var(--serif)}
.feat p{margin:0;font-size:13.5px;color:var(--ink-3);line-height:1.85}

/* ---------- 数据带 ---------- */
.band{background:var(--ink);color:var(--paper);padding:58px 32px;position:relative;overflow:hidden}
.band::before{content:"囍";position:absolute;right:-24px;top:50%;transform:translateY(-50%);font-family:var(--serif);font-size:230px;color:rgba(200,164,93,.07);line-height:1}
.band-inner{max-width:1180px;margin:0 auto;display:grid;grid-template-columns:repeat(3,1fr);text-align:center;position:relative;z-index:1}
.band b{display:block;font-family:var(--latin);font-size:44px;font-weight:600;color:var(--gold-2);line-height:1.2}
.band span{font-size:13px;letter-spacing:4px;color:rgba(246,241,230,.65);font-family:var(--serif)}

/* ---------- CTA ---------- */
.cta-sec{padding:96px 32px;text-align:center;position:relative}
.cta-inner{max-width:620px;margin:0 auto}
.cta-sec .cta-seal{width:52px;height:52px;margin:0 auto 26px;background:var(--cinnabar);color:#f7ecd6;font-family:var(--serif);font-size:26px;display:flex;align-items:center;justify-content:center;border-radius:5px;transform:rotate(-4deg);box-shadow:0 8px 22px rgba(156,58,46,.3)}
.cta-sec h2{font-size:34px;margin:0 0 16px;letter-spacing:7px;color:var(--ink);font-family:var(--serif);font-weight:700}
.cta-sec p{margin:0 0 36px;color:var(--ink-3);font-size:15px;letter-spacing:1.5px}

/* ---------- 页脚 ---------- */
.site-foot{padding:46px 32px 40px;text-align:center;color:var(--ink-4);font-size:12px;letter-spacing:3px;border-top:1px solid var(--line);background:rgba(233,223,201,.35)}
.site-foot p{margin:7px 0}
.site-foot .sub{font-size:11px;letter-spacing:1.5px}
.site-foot a{color:var(--gold);border-bottom:1px solid rgba(169,128,63,.45);transition:color .2s}
.site-foot a:hover{color:var(--cinnabar)}

/* 视图切换淡入 */
.sp-view{animation:viewin .45s ease both}
@keyframes viewin{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}

/* ---------- 响应式 ---------- */
@media (max-width:900px){
  .sig-inner{grid-template-columns:1fr;gap:40px}
  .sig-cover{max-width:420px;margin:0 auto;width:100%}
  .feat-grid{grid-template-columns:1fr 1fr}
  .flow-grid{grid-template-columns:1fr}
  .flow-item+ .flow-item{border-left:none}
}
@media (max-width:768px){
  .nav-inner{padding:13px 18px;gap:10px}
  .brand{font-size:19px;letter-spacing:3px;padding-left:12px}
  .brand em{display:none}
  .nav-links{gap:15px;font-size:13px;white-space:nowrap}
  .nav-links a:not(.nav-cta):not(.nav-user):not(.nav-avatar){display:inline-block}
  .nav-cta{padding:8px 14px;letter-spacing:2px}
  .nav-nickname{display:none}
  .hero{padding:58px 20px 50px}
  .hero h1{font-size:40px;letter-spacing:6px}
  .hero h1 em{font-size:15px;letter-spacing:4px}
  .hero .lead{font-size:14.5px}
  .hero-cta{flex-direction:column;align-items:stretch;max-width:300px;margin:0 auto 40px}
  .hero-cta .btn-solid,.hero-cta .btn-line{text-align:center;padding:14px 20px}
  .hero-meta{flex-wrap:wrap;gap:8px 0;font-size:12px}
  .hero-meta span{padding:0 16px}
  .hero-ghost{font-size:90px;top:10px}
  .sec-hd{padding:0 20px;margin-bottom:32px}
  .sec-hd h2{font-size:23px;letter-spacing:4px}
  .sec-hd em{display:none}
  .sig-inner,.tpl-grid,.feat-grid{padding-left:20px;padding-right:20px}
  .sig-text h3{font-size:29px;letter-spacing:4px}
  .cat-strip{padding:0 20px}
  .band-inner{grid-template-columns:repeat(3,1fr);gap:10px}
  .band b{font-size:30px}
  .band span{font-size:11px;letter-spacing:2px}
  .band::before{font-size:150px}
  .cta-sec{padding:70px 20px}
  .cta-sec h2{font-size:26px;letter-spacing:5px}
}
@media (max-width:480px){
  .feat-grid{grid-template-columns:1fr}
  .hero-meta b{font-size:19px}
}

/* ---------- 首页背景音乐悬浮播放器 ---------- */

/* button 默认样式重置 */
button{margin:0;padding:0;background:none;border:none;outline:none;font:inherit;cursor:pointer;-webkit-appearance:none;appearance:none;}
button::-moz-focus-inner{border:0;padding:0}

.music-fab{
  position:fixed;right:22px;bottom:30px;z-index:120;
  width:52px;height:52px;border-radius:50%;
  border:1px solid rgba(200,164,93,.65);
  background:radial-gradient(circle at 32% 28%,#3a2f1c,#1d160c 72%);
  box-shadow:0 8px 26px -8px rgba(70,54,28,.55),inset 0 0 0 3px rgba(200,164,93,.16);
  cursor:pointer;padding:0;
  display:flex;align-items:center;justify-content:center;
  transition:transform .25s ease,box-shadow .25s ease;
}
.music-fab:active{transform:scale(.92)}
.music-fab .mf-disc{
  position:absolute;inset:5px;border-radius:50%;
  border:1px solid rgba(200,164,93,.35);
}
.music-fab .mf-note{
  position:relative;font-size:21px;color:var(--gold-2);line-height:1;
  text-shadow:0 0 10px rgba(226,203,148,.55);
}
.music-fab.playing .mf-disc{animation:mfSpin 5s linear infinite}
.music-fab.playing .mf-note{animation:mfPulse 1.6s ease-in-out infinite}
@keyframes mfSpin{to{transform:rotate(360deg)}}
@keyframes mfPulse{0%,100%{opacity:1}50%{opacity:.55}}
@media (max-width:480px){
  .music-fab{right:16px;bottom:20px;width:46px;height:46px}
  .music-fab .mf-note{font-size:19px}
}