/* roulang page: index */
:root{
  --dfy-primary:#16406B;
  --dfy-primary-dark:#0F2E4E;
  --dfy-accent:#C97A2B;
  --dfy-bg:#F6F8FB;
  --dfy-surface:#FFFFFF;
  --dfy-tint:#EEF3FA;
  --dfy-line:#E3E9F1;
  --dfy-text:#14202E;
  --dfy-sub:#5A6B7F;
  --dfy-muted:#8996A6;
  --dfy-radius:16px;
  --dfy-radius-sm:12px;
  --dfy-radius-btn:10px;
  --dfy-shadow:0 1px 2px rgba(20,32,46,.04),0 8px 24px rgba(22,64,107,.06);
  --dfy-shadow-hover:0 2px 4px rgba(20,32,46,.06),0 14px 32px rgba(22,64,107,.12);
  --bs-primary:#16406B;
  --bs-body-bg:#F6F8FB;
  --bs-body-color:#14202E;
  --bs-border-color:#E3E9F1;
  --bs-border-radius:12px;
  --bs-link-color:#16406B;
  --bs-link-hover-color:#0F2E4E;
  --bs-font-sans-serif:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;
  font-size:16px;
  line-height:1.85;
  color:var(--dfy-text);
  background:var(--dfy-bg);
}
a{color:var(--dfy-primary);text-decoration:none;transition:color .2s ease;}
a:hover{color:var(--dfy-primary-dark);text-decoration:underline;text-underline-offset:3px;}
img{max-width:100%;height:auto;}
button{font-family:inherit;}
p{margin:0 0 14px;}
h1,h2,h3,h4{margin:0;font-weight:700;color:var(--dfy-text);}
.dfy-container{width:100%;max-width:1200px;margin:0 auto;padding:0 24px;}
.dfy-section{padding:72px 0;}
.dfy-section--white{background:var(--dfy-surface);}
.dfy-section--tint{background:var(--dfy-tint);}
.dfy-section[id]{scroll-margin-top:96px;}

/* header */
.dfy-header{
  position:sticky;top:0;z-index:1030;
  background:rgba(255,255,255,.95);
  border-bottom:1px solid var(--dfy-line);
  backdrop-filter:blur(6px);
  -webkit-backdrop-filter:blur(6px);
}
.dfy-header-inner{position:relative;display:flex;align-items:center;justify-content:space-between;gap:24px;height:72px;transition:height .22s ease;}
.dfy-header.is-scrolled .dfy-header-inner{height:62px;}
.dfy-logo{display:inline-flex;align-items:center;gap:10px;color:var(--dfy-primary);font-weight:700;font-size:19px;letter-spacing:.02em;min-width:0;}
.dfy-logo:hover{color:var(--dfy-primary);text-decoration:none;}
.dfy-logo-mark{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;flex:0 0 34px;border:1px solid var(--dfy-line);border-radius:10px;background:#fff;color:var(--dfy-primary);}
.dfy-logo-sub{display:inline-block;margin-left:6px;padding:1px 8px;font-size:11px;font-weight:500;color:var(--dfy-muted);border:1px solid var(--dfy-line);border-radius:999px;vertical-align:3px;}
.dfy-nav{display:flex;align-items:center;gap:28px;}
.dfy-nav-link{position:relative;display:inline-block;padding:6px 0;font-size:15px;color:var(--dfy-sub);white-space:nowrap;}
.dfy-nav-link::after{content:"";position:absolute;left:50%;bottom:-2px;width:0;height:2px;background:var(--dfy-primary);transform:translateX(-50%);transition:width .2s ease;}
.dfy-nav-link:hover,.dfy-nav-link.is-active{color:var(--dfy-primary);text-decoration:none;}
.dfy-nav-link:hover::after,.dfy-nav-link.is-active::after{width:60%;}
.dfy-nav-cta{flex:0 0 auto;}
.dfy-nav-toggle{
  display:none;width:44px;height:44px;align-items:center;justify-content:center;
  border:1px solid var(--dfy-line);border-radius:10px;background:#fff;color:var(--dfy-primary);cursor:pointer;
}
.dfy-nav-toggle:focus-visible{outline:2px solid var(--dfy-accent);outline-offset:2px;}

/* buttons */
.dfy-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:44px;padding:11px 22px;border-radius:var(--dfy-radius-btn);
  font-size:15px;font-weight:600;line-height:1.4;border:1px solid transparent;
  cursor:pointer;transition:all .22s ease;
}
.dfy-btn:hover{text-decoration:none;}
.dfy-btn-primary{background:var(--dfy-primary);color:#fff;box-shadow:0 8px 18px rgba(22,64,107,.16);}
.dfy-btn-primary:hover{background:var(--dfy-primary-dark);color:#fff;transform:translateY(-1px);box-shadow:0 12px 24px rgba(22,64,107,.22);}
.dfy-btn-primary:active{transform:translateY(0);filter:brightness(.96);}
.dfy-btn-outline{background:#fff;border-color:var(--dfy-primary);color:var(--dfy-primary);}
.dfy-btn-outline:hover{background:var(--dfy-tint);color:var(--dfy-primary-dark);border-color:var(--dfy-primary-dark);}
.dfy-btn:focus-visible{outline:2px solid var(--dfy-accent);outline-offset:2px;}
.dfy-btn-sm{padding:8px 16px;font-size:14px;min-height:40px;}

/* hero */
.dfy-hero{
  position:relative;
  padding:76px 0 68px;
  background:linear-gradient(180deg,#FFFFFF 0%,#F2F6FC 100%);
  border-bottom:1px solid var(--dfy-line);
}
.dfy-hero-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:52px;align-items:center;}
.dfy-eyebrow{display:inline-block;margin-bottom:14px;padding:4px 12px;font-size:12px;font-weight:600;letter-spacing:.06em;color:var(--dfy-accent);background:rgba(201,122,43,.08);border:1px solid rgba(201,122,43,.24);border-radius:999px;}
.dfy-hero h1{font-size:40px;line-height:1.28;letter-spacing:-.01em;}
.dfy-hero h1 .dfy-h1-mark{color:var(--dfy-primary);}
.dfy-hero-intro{margin:20px 0 0;font-size:16px;line-height:1.9;color:var(--dfy-sub);max-width:560px;}
.dfy-hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:28px;}
.dfy-hero-note{margin-top:18px;font-size:12px;color:var(--dfy-muted);line-height:1.7;}
.dfy-hero-panel{
  background:var(--dfy-primary);color:#fff;border-radius:var(--dfy-radius);
  padding:32px 30px;box-shadow:0 18px 40px rgba(22,64,107,.18);min-width:0;
}
.dfy-hero-panel .dfy-panel-tag{display:inline-block;padding:4px 10px;font-size:12px;border:1px solid rgba(255,255,255,.24);border-radius:999px;color:rgba(255,255,255,.85);}
.dfy-hero-panel h2{margin:16px 0 6px;font-size:21px;line-height:1.5;color:#fff;}
.dfy-panel-list{list-style:none;margin:18px 0 0;padding:0;}
.dfy-panel-list li{position:relative;padding:12px 0 12px 22px;font-size:14px;line-height:1.75;color:rgba(255,255,255,.86);border-top:1px solid rgba(255,255,255,.14);}
.dfy-panel-list li:first-child{border-top:0;}
.dfy-panel-list li::before{content:"";position:absolute;left:0;top:20px;width:8px;height:8px;border-radius:2px;background:var(--dfy-accent);}
.dfy-panel-foot{margin:18px 0 0;font-size:12px;color:rgba(255,255,255,.66);}

/* section head */
.dfy-section-head{max-width:780px;margin-bottom:33px;}
.dfy-h2{font-size:30px;line-height:1.35;margin-bottom:12px;}
.dfy-lede{margin:0;font-size:16px;line-height:1.85;color:var(--dfy-sub);}

/* plan matrix */
.dfy-plan-grid{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,1fr);gap:24px;align-items:start;}
.dfy-plan-main{
  background:var(--dfy-primary);color:#fff;border-radius:var(--dfy-radius);
  padding:34px 32px;box-shadow:0 16px 34px rgba(22,64,107,.16);min-width:0;
}
.dfy-plan-main h3{margin-bottom:14px;font-size:24px;color:#fff;}
.dfy-plan-main p{font-size:15px;line-height:1.85;color:rgba(255,255,255,.84);}
.dfy-tag-row{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0 20px;}
.dfy-tag-solid{display:inline-block;padding:4px 12px;font-size:12px;border-radius:999px;border:1px solid rgba(255,255,255,.28);color:rgba(255,255,255,.9);}
.dfy-link-light{display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:#fff;border-bottom:1px solid rgba(255,255,255,.5);padding-bottom:2px;}
.dfy-link-light:hover{color:#fff;text-decoration:none;border-bottom-color:#fff;}
.dfy-plan-side{display:grid;gap:16px;min-width:0;}
.dfy-plan-card{
  background:#fff;border:1px solid var(--dfy-line);border-radius:var(--dfy-radius-sm);
  padding:22px 22px 20px;box-shadow:var(--dfy-shadow);box-shadow:var(--dfy-shadow);
  transition:all .22s ease;min-width:0;
}
.dfy-plan-card:hover{transform:translateY(-2px);box-shadow:var(--dfy-shadow-hover);border-color:#D3DEEC;}
.dfy-plan-card h3{font-size:17px;margin-bottom:8px;}
.dfy-plan-card p{margin:0;font-size:14px;line-height:1.8;color:var(--dfy-sub);}

/* spec card list */
.dfy-spec-list{background:#fff;border:1px solid var(--dfy-line);border-radius:var(--dfy-radius);box-shadow:var(--dfy-shadow);overflow:hidden;}
.dfy-spec-row{display:grid;grid-template-columns:150px minmax(0,1fr) minmax(0,1.5fr);gap:18px;align-items:center;padding:18px 26px;border-top:1px solid var(--dfy-line);font-size:15px;}
.dfy-spec-row:first-child{border-top:0;}
.dfy-spec-head{background:var(--dfy-tint);font-size:13px;font-weight:600;letter-spacing:.04em;color:var(--dfy-sub);padding:14px 26px;}
.dfy-spec-label{font-weight:600;color:var(--dfy-primary);}
.dfy-spec-value{color:var(--dfy-text);}
.dfy-spec-desc{color:var(--dfy-sub);font-size:14px;line-height:1.8;}

/* feature grid */
.dfy-feature-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:24px;}
.dfy-feature-card{background:#fff;border:1px solid var(--dfy-line);border-radius:var(--dfy-radius-sm);padding:24px 22px;box-shadow:var(--dfy-shadow);transition:all .22s ease;min-width:0;}
.dfy-feature-card:hover{transform:translateY(-2px);box-shadow:var(--dfy-shadow-hover);}
.dfy-feature-card h3{font-size:17px;margin-bottom:8px;}
.dfy-feature-card p{margin:0;font-size:14px;line-height:1.8;color:var(--dfy-sub);}
.dfy-feature-icon{display:inline-flex;align-items:center;justify-content:center;width:38px;height:38px;margin-bottom:14px;border-radius:10px;background:var(--dfy-tint);color:var(--dfy-primary);}

/* numbered rows */
.dfy-num-list{border-top:1px solid var(--dfy-line);}
.dfy-num-row{display:grid;grid-template-columns:78px minmax(0,1fr);gap:20px;padding:24px 0;border-bottom:1px solid var(--dfy-line);}
.dfy-num-idx{font-size:26px;font-weight:700;line-height:1.2;color:var(--dfy-accent);font-variant-numeric:tabular-nums;}
.dfy-num-body h3{font-size:18px;margin-bottom:6px;}
.dfy-num-body p{margin:0;font-size:14.5px;line-height:1.85;color:var(--dfy-sub);}

/* steps */
.dfy-steps{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:18px;}
.dfy-step{position:relative;background:#fff;border:1px solid var(--dfy-line);border-radius:var(--dfy-radius-sm);padding:24px 20px 22px;box-shadow:var(--dfy-shadow);min-width:0;}
.dfy-step-dot{display:inline-flex;align-items:center;justify-content:center;width:30px;height:30px;margin-bottom:14px;border-radius:50%;background:var(--dfy-primary);color:#fff;font-size:13px;font-weight:700;font-variant-numeric:tabular-nums;}
.dfy-step h3{font-size:16px;margin-bottom:6px;}
.dfy-step p{margin:0;font-size:13.5px;line-height:1.8;color:var(--dfy-sub);}

/* scene wall */
.dfy-scene-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px;}
.dfy-scene-card{background:#fff;border:1px solid var(--dfy-line);border-radius:var(--dfy-radius);padding:0;overflow:hidden;box-shadow:var(--dfy-shadow);transition:all .22s ease;min-width:0;}
.dfy-scene-card:hover{transform:translateY(-2px);box-shadow:var(--dfy-shadow-hover);}
.dfy-scene-visual{height:112px;background:linear-gradient(135deg,#E8EFF8 0%,#F5F8FC 60%,#EDF2F9 100%);position:relative;overflow:hidden;}
.dfy-scene-visual span{position:absolute;display:block;border-radius:6px;background:rgba(22,64,107,.16);}
.dfy-scene-visual .v1{left:24px;bottom:22px;width:52px;height:10px;}
.dfy-scene-visual .v2{left:24px;bottom:42px;width:86px;height:10px;background:rgba(22,64,107,.26);}
.dfy-scene-visual .v3{left:24px;bottom:62px;width:38px;height:10px;background:rgba(201,122,43,.55);}
.dfy-scene-body{padding:20px 22px 22px;}
.dfy-scene-body h3{font-size:17px;margin-bottom:8px;}
.dfy-scene-body p{margin:0;font-size:14px;line-height:1.8;color:var(--dfy-sub);}
.dfy-scene-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px;}

/* tags */
.dfy-tag{display:inline-block;padding:3px 10px;font-size:12px;line-height:1.7;border-radius:999px;background:var(--dfy-tint);color:var(--dfy-primary);}
.dfy-tag-accent{background:transparent;border:1px solid rgba(201,122,43,.4);color:var(--dfy-accent);}

/* posts */
.dfy-post-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px;}
.dfy-post-card{background:#fff;border:1px solid var(--dfy-line);border-radius:var(--dfy-radius-sm);padding:22px;box-shadow:var(--dfy-shadow);transition:all .22s ease;min-width:0;display:flex;flex-direction:column;}
.dfy-post-card:hover{transform:translateY(-2px);box-shadow:var(--dfy-shadow-hover);border-color:#D3DEEC;}
.dfy-post-card .dfy-tag{margin-bottom:12px;align-self:flex-start;}
.dfy-post-title{font-size:17px;line-height:1.55;margin-bottom:10px;}
.dfy-post-title a{color:var(--dfy-text);}
.dfy-post-title a:hover{color:var(--dfy-primary);text-decoration:none;}
.dfy-post-excerpt{margin:0 0 16px;font-size:14px;line-height:1.8;color:var(--dfy-sub);}
.dfy-post-meta{margin-top:auto;font-size:12px;color:var(--dfy-muted);font-variant-numeric:tabular-nums;}
.dfy-empty{padding:56px 24px;text-align:center;background:#fff;border:1px dashed var(--dfy-line);border-radius:var(--dfy-radius);color:var(--dfy-muted);font-size:14px;}
.dfy-list-more{margin-top:32px;text-align:center;}

/* download */
.dfy-download{background:var(--dfy-primary);color:#fff;border-radius:var(--dfy-radius);padding:44px 40px;box-shadow:0 20px 44px rgba(22,64,107,.2);}
.dfy-download-grid{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:36px;align-items:center;}
.dfy-download h2{color:#fff;font-size:28px;line-height:1.4;margin-bottom:12px;}
.dfy-download p{color:rgba(255,255,255,.82);font-size:15px;margin:0;}
.dfy-download-note{margin-top:16px;font-size:12px;color:rgba(255,255,255,.62);line-height:1.7;}
.dfy-dl-actions{display:grid;gap:12px;}
.dfy-dl-btn{
  display:flex;align-items:center;gap:12px;padding:14px 18px;min-height:56px;
  background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.24);border-radius:var(--dfy-radius-btn);
  color:#fff;font-size:15px;font-weight:600;transition:all .22s ease;
}
.dfy-dl-btn:hover{background:rgba(255,255,255,.16);border-color:rgba(255,255,255,.44);color:#fff;text-decoration:none;transform:translateY(-2px);box-shadow:0 12px 22px rgba(0,0,0,.18);}
.dfy-dl-btn:focus-visible{outline:2px solid #fff;outline-offset:2px;}
.dfy-dl-btn svg{flex:0 0 20px;color:#fff;}
.dfy-dl-btn small{display:block;font-size:12px;font-weight:400;color:rgba(255,255,255,.66);}

/* glossary */
.dfy-gloss-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 40px;}
.dfy-gloss-item{padding:16px 0;border-bottom:1px solid var(--dfy-line);min-width:0;}
.dfy-gloss-item dt{font-size:15px;font-weight:700;color:var(--dfy-primary);margin-bottom:4px;}
.dfy-gloss-item dd{margin:0;font-size:14px;line-height:1.8;color:var(--dfy-sub);}

/* risk bar */
.dfy-risk{background:var(--dfy-tint);border-top:1px solid var(--dfy-line);border-bottom:1px solid var(--dfy-line);}
.dfy-risk-grid{display:grid;grid-template-columns:minmax(0,.8fr) minmax(0,1.6fr);gap:32px;align-items:center;}
.dfy-risk h2{font-size:22px;line-height:1.45;}
.dfy-risk-list{list-style:none;margin:0;padding:0;display:grid;gap:10px;}
.dfy-risk-list li{position:relative;padding-left:20px;font-size:14px;line-height:1.8;color:var(--dfy-sub);}
.dfy-risk-list li::before{content:"";position:absolute;left:0;top:10px;width:7px;height:7px;border-radius:50%;background:var(--dfy-accent);}

/* accordion */
.dfy-accordion{--bs-accordion-active-bg:#fff;--bs-accordion-active-color:var(--dfy-primary);--bs-accordion-btn-focus-box-shadow:none;--bs-accordion-border-width:0;--bs-accordion-border-radius:14px;}
.dfy-accordion .accordion-item{border:1px solid var(--dfy-line);border-radius:14px;overflow:hidden;margin-bottom:12px;background:#fff;box-shadow:var(--dfy-shadow);}
.dfy-accordion .accordion-button{font-size:15px;font-weight:600;color:var(--dfy-text);background:#fff;padding:18px 22px;line-height:1.7;box-shadow:none;transition:color .2s ease;}
.dfy-accordion .accordion-button:not(.collapsed){color:var(--dfy-primary);box-shadow:none;border-left:3px solid var(--dfy-primary);padding-left:19px;}
.dfy-accordion .accordion-button:focus{box-shadow:none;border-color:var(--dfy-line);}
.dfy-accordion .accordion-button:focus-visible{outline:2px solid var(--dfy-accent);outline-offset:-2px;}
.dfy-accordion .accordion-body{padding:2px 22px 20px;font-size:14.5px;line-height:1.85;color:var(--dfy-sub);}

/* topic entry */
.dfy-topic-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px;}
.dfy-topic-card{display:flex;align-items:center;justify-content:space-between;gap:20px;background:#fff;border:1px solid var(--dfy-line);border-radius:var(--dfy-radius);padding:28px 26px;box-shadow:var(--dfy-shadow);transition:all .22s ease;min-width:0;}
.dfy-topic-card:hover{transform:translateY(-2px);box-shadow:var(--dfy-shadow-hover);text-decoration:none;border-color:#D3DEEC;}
.dfy-topic-card h3{font-size:19px;margin-bottom:8px;color:var(--dfy-text);}
.dfy-topic-card p{margin:0;font-size:14px;line-height:1.8;color:var(--dfy-sub);}
.dfy-topic-arrow{flex:0 0 44px;width:44px;height:44px;display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--dfy-line);border-radius:50%;color:var(--dfy-primary);transition:all .22s ease;}
.dfy-topic-card:hover .dfy-topic-arrow{background:var(--dfy-tint);border-color:#CBD9EA;transform:translateX(4px);}
.dfy-topic-plain{background:#fff;border:1px solid var(--dfy-line);border-radius:var(--dfy-radius);padding:28px 26px;box-shadow:var(--dfy-shadow);min-width:0;}
.dfy-topic-plain h3{font-size:19px;margin-bottom:10px;}
.dfy-topic-plain ul{list-style:none;margin:0;padding:0;}
.dfy-topic-plain li{padding:10px 0 10px 18px;position:relative;font-size:14px;line-height:1.8;color:var(--dfy-sub);border-top:1px solid var(--dfy-line);}
.dfy-topic-plain li:first-child{border-top:0;}
.dfy-topic-plain li::before{content:"";position:absolute;left:0;top:19px;width:6px;height:6px;border-radius:2px;background:var(--dfy-accent);}

/* cta */
.dfy-cta-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:44px;align-items:center;}
.dfy-cta h2{font-size:28px;line-height:1.4;margin-bottom:12px;}
.dfy-cta p{font-size:15px;line-height:1.85;color:var(--dfy-sub);}
.dfy-form{background:#fff;border:1px solid var(--dfy-line);border-radius:var(--dfy-radius);padding:28px;box-shadow:var(--dfy-shadow);min-width:0;}
.dfy-field{margin-bottom:16px;}
.dfy-field label{display:block;margin-bottom:6px;font-size:13px;font-weight:600;color:var(--dfy-sub);}
.dfy-input{width:100%;min-height:44px;padding:10px 14px;font-size:15px;color:var(--dfy-text);background:#fff;border:1px solid var(--dfy-line);border-radius:var(--dfy-radius-btn);transition:border-color .2s ease,box-shadow .2s ease;}
.dfy-input::placeholder{color:var(--dfy-muted);}
.dfy-input:focus{outline:none;border-color:var(--dfy-primary);box-shadow:0 0 0 3px rgba(22,64,107,.10);}
textarea.dfy-input{min-height:96px;resize:vertical;}
.dfy-form-note{margin:12px 0 0;font-size:12px;color:var(--dfy-muted);line-height:1.7;}

/* footer */
.dfy-footer{background:#fff;border-top:1px solid var(--dfy-line);padding:56px 0 24px;}
.dfy-footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:36px;}
.dfy-footer-brand p{margin:14px 0 0;font-size:13px;line-height:1.85;color:var(--dfy-sub);}
.dfy-footer h4{font-size:14px;font-weight:700;color:var(--dfy-text);margin-bottom:14px;}
.dfy-footer ul{list-style:none;margin:0;padding:0;}
.dfy-footer li{margin-bottom:10px;font-size:13.5px;}
.dfy-footer li a{color:var(--dfy-sub);}
.dfy-footer li a:hover{color:var(--dfy-primary);}
.dfy-footer-bottom{margin-top:40px;padding-top:20px;border-top:1px solid var(--dfy-line);display:flex;flex-wrap:wrap;gap:10px 24px;align-items:center;justify-content:space-between;font-size:12px;color:var(--dfy-muted);}
.dfy-footer-bottom p{margin:0;}

@media (max-width:1199px){
  .dfy-hero h1{font-size:34px;}
  .dfy-feature-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .dfy-steps{grid-template-columns:repeat(3,minmax(0,1fr));}
}
@media (max-width:991px){
  .dfy-header-inner{height:64px;}
  .dfy-header.is-scrolled .dfy-header-inner{height:60px;}
  .dfy-nav-toggle{display:inline-flex;}
  .dfy-nav{
    position:absolute;top:100%;left:-24px;right:-24px;display:none;
    flex-direction:column;align-items:stretch;gap:0;
    background:#fff;border-bottom:1px solid var(--dfy-line);
    padding:12px 24px 20px;box-shadow:0 16px 28px rgba(22,64,107,.10);
  }
  .dfy-nav.is-open{display:flex;}
  .dfy-nav-link{padding:13px 0;border-bottom:1px solid var(--dfy-line);font-size:15px;}
  .dfy-nav-link::after{display:none;}
  .dfy-nav-cta{margin-top:16px;width:100%;}
  .dfy-hero{padding:52px 0 48px;}
  .dfy-hero-grid{grid-template-columns:minmax(0,1fr);gap:32px;}
  .dfy-hero h1{font-size:30px;}
  .dfy-section{padding:56px 0;}
  .dfy-plan-grid{grid-template-columns:minmax(0,1fr);}
  .dfy-scene-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .dfy-post-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .dfy-download-grid{grid-template-columns:minmax(0,1fr);gap:28px;}
  .dfy-risk-grid{grid-template-columns:minmax(0,1fr);gap:20px;}
  .dfy-cta-grid{grid-template-columns:minmax(0,1fr);gap:28px;}
  .dfy-topic-grid{grid-template-columns:minmax(0,1fr);}
  .dfy-footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:28px;}
  .dfy-gloss-grid{grid-template-columns:minmax(0,1fr);gap:0;}
}
@media (max-width:767px){
  .dfy-container{padding:0 16px;}
  .dfy-nav{left:-16px;right:-16px;padding:12px 16px 20px;}
  .dfy-section{padding:44px 0;}
  .dfy-h2{font-size:22px;}
  .dfy-hero h1{font-size:26px;line-height:1.34;}
  .dfy-hero-intro{font-size:15px;}
  .dfy-hero-actions{flex-direction:column;align-items:stretch;}
  .dfy-hero-actions .dfy-btn{width:100%;}
  .dfy-hero-panel{padding:24px 22px;}
  .dfy-plan-main{padding:26px 22px;}
  .dfy-spec-row{grid-template-columns:minmax(0,1fr);gap:6px;padding:16px 20px;}
  .dfy-spec-head{display:none;}
  .dfy-spec-desc{font-size:13.5px;}
  .dfy-feature-grid{grid-template-columns:minmax(0,1fr);}
  .dfy-steps{grid-template-columns:minmax(0,1fr);}
  .dfy-scene-grid{grid-template-columns:minmax(0,1fr);}
  .dfy-post-grid{grid-template-columns:minmax(0,1fr);}
  .dfy-num-row{grid-template-columns:52px minmax(0,1fr);gap:14px;}
  .dfy-num-idx{font-size:22px;}
  .dfy-download{padding:28px 22px;}
  .dfy-download h2{font-size:22px;}
  .dfy-cta h2{font-size:22px;}
  .dfy-form{padding:22px;}
  .dfy-footer{padding:40px 0 20px;}
  .dfy-footer-grid{grid-template-columns:minmax(0,1fr);gap:24px;}
  .dfy-footer-bottom{flex-direction:column;align-items:flex-start;}
}
@media (max-width:520px){
  .dfy-logo{font-size:16px;}
  .dfy-logo-sub{display:none;}
  .dfy-logo-mark{width:30px;height:30px;flex-basis:30px;}
  .dfy-hero h1{font-size:23px;}
  .dfy-topic-card{flex-direction:column;align-items:flex-start;}
  .dfy-dl-btn{font-size:14px;padding:12px 14px;}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{transition:none !important;animation:none !important;}
  .dfy-plan-card:hover,.dfy-feature-card:hover,.dfy-scene-card:hover,.dfy-post-card:hover,.dfy-topic-card:hover,.dfy-dl-btn:hover,.dfy-btn-primary:hover{transform:none;}
}

/* roulang page: article */
:root{
  --dfy-primary:#16406B;
  --dfy-primary-dark:#0F2E4E;
  --dfy-accent:#C97A2B;
  --dfy-bg:#F6F8FB;
  --dfy-surface:#FFFFFF;
  --dfy-tint:#EEF3FA;
  --dfy-line:#E3E9F1;
  --dfy-text:#14202E;
  --dfy-sub:#5A6B7F;
  --dfy-muted:#8996A6;
  --dfy-radius:16px;
  --dfy-radius-sm:12px;
  --dfy-radius-btn:10px;
  --dfy-shadow:0 1px 2px rgba(20,32,46,.04),0 8px 24px rgba(22,64,107,.06);
  --dfy-shadow-hover:0 2px 4px rgba(20,32,46,.06),0 14px 32px rgba(22,64,107,.12);
  --bs-primary:#16406B;
  --bs-body-bg:#F6F8FB;
  --bs-body-color:#14202E;
  --bs-border-color:#E3E9F1;
  --bs-border-radius:12px;
  --bs-link-color:#16406B;
  --bs-link-hover-color:#0F2E4E;
  --bs-font-sans-serif:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;
  font-size:16px;
  line-height:1.85;
  color:var(--dfy-text);
  background:var(--dfy-bg);
}
a{color:var(--dfy-primary);text-decoration:none;transition:color .2s ease;}
a:hover{color:var(--dfy-primary-dark);text-decoration:underline;text-underline-offset:3px;}
img{max-width:100%;height:auto;}
button{font-family:inherit;}
p{margin:0 0 16px;}
p:last-child{margin-bottom:0;}
.dfy-container{width:100%;max-width:1200px;margin:0 auto;padding:0 24px;}
.dfy-section{padding:72px 0;}
.dfy-section--white{background:var(--dfy-surface);}
.dfy-section--tint{background:var(--dfy-tint);}
.dfy-section[id]{scroll-margin-top:96px;}
/* header */
.dfy-header{
  position:sticky;top:0;z-index:1030;
  background:rgba(255,255,255,.95);
  border-bottom:1px solid var(--dfy-line);
  backdrop-filter:blur(6px);
  -webkit-backdrop-filter:blur(6px);
}
.dfy-header-inner{position:relative;display:flex;align-items:center;justify-content:space-between;gap:24px;height:72px;transition:height .22s ease;}
.dfy-header.is-scrolled .dfy-header-inner{height:62px;}
.dfy-logo{display:inline-flex;align-items:center;gap:10px;color:var(--dfy-primary);font-weight:700;font-size:19px;letter-spacing:.02em;min-width:0;}
.dfy-logo:hover{color:var(--dfy-primary);text-decoration:none;}
.dfy-logo-mark{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;flex:0 0 34px;border:1px solid var(--dfy-line);border-radius:10px;background:#fff;color:var(--dfy-primary);}
.dfy-logo-text{white-space:nowrap;}
.dfy-logo-sub{display:inline-block;margin-left:6px;padding:1px 8px;font-size:11px;font-weight:500;color:var(--dfy-muted);border:1px solid var(--dfy-line);border-radius:999px;vertical-align:3px;}
.dfy-nav{display:flex;align-items:center;gap:28px;}
.dfy-nav-link{position:relative;display:inline-block;padding:6px 0;font-size:15px;color:var(--dfy-sub);white-space:nowrap;}
.dfy-nav-link::after{content:"";position:absolute;left:50%;bottom:-2px;width:0;height:2px;background:var(--dfy-primary);transform:translateX(-50%);transition:width .2s ease;}
.dfy-nav-link:hover,.dfy-nav-link.is-active{color:var(--dfy-primary);text-decoration:none;}
.dfy-nav-link:hover::after,.dfy-nav-link.is-active::after{width:60%;}
.dfy-nav-cta{flex:0 0 auto;}
.dfy-nav-toggle{
  display:none;width:44px;height:44px;align-items:center;justify-content:center;
  border:1px solid var(--dfy-line);border-radius:10px;background:#fff;color:var(--dfy-primary);cursor:pointer;
}
.dfy-nav-toggle:focus-visible{outline:2px solid var(--dfy-accent);outline-offset:2px;}
/* buttons */
.dfy-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:44px;padding:11px 22px;border-radius:var(--dfy-radius-btn);
  font-size:15px;font-weight:600;line-height:1.4;border:1px solid transparent;
  cursor:pointer;transition:all .22s ease;
}
.dfy-btn:hover{text-decoration:none;}
.dfy-btn-primary{background:var(--dfy-primary);color:#fff;box-shadow:0 8px 18px rgba(22,64,107,.16);}
.dfy-btn-primary:hover{background:var(--dfy-primary-dark);color:#fff;transform:translateY(-1px);box-shadow:0 12px 24px rgba(22,64,107,.22);}
.dfy-btn-primary:active{transform:translateY(0);filter:brightness(.96);}
.dfy-btn-outline{background:#fff;border-color:var(--dfy-primary);color:var(--dfy-primary);}
.dfy-btn-outline:hover{background:var(--dfy-tint);color:var(--dfy-primary-dark);border-color:var(--dfy-primary-dark);}
.dfy-btn:focus-visible{outline:2px solid var(--dfy-accent);outline-offset:2px;}
.dfy-btn-sm{padding:8px 16px;font-size:14px;min-height:40px;}
/* breadcrumb */
.dfy-crumbs{background:var(--dfy-surface);border-bottom:1px solid var(--dfy-line);padding:14px 0;}
.dfy-crumbs-list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin:0;padding:0;list-style:none;font-size:12.5px;color:var(--dfy-muted);line-height:1.6;}
.dfy-crumbs-list li{display:inline-flex;align-items:center;gap:8px;min-width:0;}
.dfy-crumbs-list li+li::before{content:"/";color:#C3CDDA;}
.dfy-crumbs-list a{color:var(--dfy-muted);}
.dfy-crumbs-list a:hover{color:var(--dfy-primary);}
.dfy-crumbs-current{color:var(--dfy-sub);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:100%;}
/* article head */
.dfy-post-head{
  padding:46px 0 34px;
  background:linear-gradient(180deg,#FFFFFF 0%,#F2F6FC 100%);
  border-bottom:1px solid var(--dfy-line);
}
.dfy-post-head-inner{max-width:900px;}
.dfy-eyebrow{display:inline-block;margin-bottom:14px;padding:4px 12px;font-size:12px;font-weight:600;letter-spacing:.06em;color:var(--dfy-accent);background:rgba(201,122,43,.08);border:1px solid rgba(201,122,43,.24);border-radius:999px;}
.dfy-post-title{font-size:clamp(26px,3.4vw,34px);line-height:1.38;font-weight:700;letter-spacing:-.01em;margin:0;overflow-wrap:break-word;word-break:normal;}
.dfy-post-meta{display:flex;flex-wrap:wrap;align-items:center;gap:10px 18px;margin-top:20px;font-size:13px;color:var(--dfy-muted);}
.dfy-post-meta span{display:inline-flex;align-items:center;gap:6px;}
.dfy-tag{display:inline-block;padding:4px 10px;font-size:12px;line-height:1.6;color:var(--dfy-primary);background:var(--dfy-tint);border:1px solid var(--dfy-line);border-radius:999px;}
.dfy-tag--line{color:var(--dfy-accent);border-color:rgba(201,122,43,.34);background:#fff;}
/* layout */
.dfy-article-wrap{padding:44px 0 72px;}
.dfy-article-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:40px;align-items:start;}
.dfy-article-main{min-width:0;}
.dfy-article-aside{min-width:0;display:flex;flex-direction:column;gap:20px;position:sticky;top:96px;}
/* cards */
.dfy-card{
  background:var(--dfy-surface);border:1px solid var(--dfy-line);
  border-radius:var(--dfy-radius);box-shadow:var(--dfy-shadow);
}
.dfy-card-pad{padding:24px 26px;}
.dfy-card-title{margin:0 0 12px;font-size:16px;font-weight:700;color:var(--dfy-text);line-height:1.5;}
.dfy-card-sub{font-size:13px;color:var(--dfy-muted);line-height:1.75;margin:0;}
.dfy-point-list{list-style:none;margin:0;padding:0;}
.dfy-point-list li{position:relative;padding:10px 0 10px 18px;font-size:14px;line-height:1.75;color:var(--dfy-sub);border-top:1px solid var(--dfy-line);}
.dfy-point-list li:first-child{border-top:0;padding-top:0;}
.dfy-point-list li::before{content:"";position:absolute;left:0;top:18px;width:6px;height:6px;border-radius:2px;background:var(--dfy-accent);}
.dfy-point-list li:first-child::before{top:8px;}
/* summary */
.dfy-summary{background:var(--dfy-tint);border:1px solid var(--dfy-line);border-radius:var(--dfy-radius);padding:26px 28px;margin-bottom:24px;}
.dfy-summary h2{margin:0 0 6px;font-size:17px;font-weight:700;color:var(--dfy-primary);line-height:1.5;border:0;padding:0;}
.dfy-summary p{margin:0 0 14px;font-size:13.5px;color:var(--dfy-sub);line-height:1.8;}
/* article body */
.dfy-article-body{
  background:var(--dfy-surface);border:1px solid var(--dfy-line);
  border-radius:var(--dfy-radius);box-shadow:var(--dfy-shadow);
  padding:38px 42px;font-size:16px;line-height:1.9;color:var(--dfy-text);
  overflow-wrap:break-word;word-break:normal;
}
.dfy-article-body>*:first-child{margin-top:0;}
.dfy-article-body h2{font-size:22px;line-height:1.5;font-weight:700;color:var(--dfy-text);margin:36px 0 14px;padding-left:12px;border-left:3px solid var(--dfy-accent);}
.dfy-article-body h3{font-size:18px;line-height:1.6;font-weight:700;color:var(--dfy-text);margin:26px 0 10px;}
.dfy-article-body h4{font-size:16px;font-weight:700;margin:20px 0 8px;}
.dfy-article-body p{margin:0 0 18px;}
.dfy-article-body ul,.dfy-article-body ol{margin:0 0 18px;padding-left:22px;}
.dfy-article-body ul{list-style:none;padding-left:4px;}
.dfy-article-body ul li{position:relative;padding-left:16px;margin-bottom:8px;}
.dfy-article-body ul li::before{content:"";position:absolute;left:0;top:.72em;width:6px;height:6px;background:var(--dfy-primary);border-radius:1px;}
.dfy-article-body ol li{margin-bottom:8px;}
.dfy-article-body blockquote{margin:22px 0;padding:16px 20px;background:var(--dfy-tint);border-left:3px solid var(--dfy-primary);border-radius:0 12px 12px 0;color:var(--dfy-sub);}
.dfy-article-body blockquote p:last-child{margin-bottom:0;}
.dfy-article-body img{display:block;max-width:100%;height:auto;margin:22px auto;border-radius:12px;}
.dfy-article-body table{display:block;width:100%;overflow-x:auto;border-collapse:separate;border-spacing:0;border:1px solid var(--dfy-line);border-radius:12px;font-size:14px;margin:0 0 20px;}
.dfy-article-body th,.dfy-article-body td{padding:10px 14px;text-align:left;border-bottom:1px solid var(--dfy-line);vertical-align:top;}
.dfy-article-body thead th{background:var(--dfy-tint);color:var(--dfy-primary);font-weight:700;white-space:nowrap;}
.dfy-article-body tbody tr:nth-child(even) td{background:#F9FBFE;}
.dfy-article-body tbody tr:last-child td{border-bottom:0;}
.dfy-article-body a{color:var(--dfy-primary);text-decoration:underline;text-underline-offset:3px;}
.dfy-article-body strong{font-weight:700;color:var(--dfy-primary-dark);}
/* empty state */
.dfy-empty{text-align:center;padding:56px 24px;}
.dfy-empty svg{color:#C3CDDA;margin-bottom:14px;}
.dfy-empty h2{font-size:19px;margin:0 0 8px;border:0;padding:0;color:var(--dfy-text);}
.dfy-empty p{color:var(--dfy-muted);font-size:14px;margin:0 0 20px;}
/* notice */
.dfy-notice{display:flex;flex-wrap:wrap;gap:14px 24px;align-items:flex-start;background:var(--dfy-tint);border:1px solid var(--dfy-line);border-radius:var(--dfy-radius);padding:20px 26px;margin-top:24px;}
.dfy-notice h2{margin:0;font-size:15px;font-weight:700;color:var(--dfy-primary);line-height:1.6;flex:0 0 auto;}
.dfy-notice ul{list-style:none;margin:0;padding:0;flex:1 1 320px;min-width:0;display:grid;gap:6px;}
.dfy-notice li{position:relative;padding-left:16px;font-size:13px;line-height:1.7;color:var(--dfy-sub);}
.dfy-notice li::before{content:"";position:absolute;left:0;top:8px;width:5px;height:5px;border-radius:50%;background:var(--dfy-accent);}
/* download */
.dfy-download{background:var(--dfy-primary);color:#fff;border-radius:var(--dfy-radius);padding:32px 34px;margin-top:28px;box-shadow:0 18px 40px rgba(22,64,107,.18);}
.dfy-download h2{margin:0 0 8px;font-size:20px;line-height:1.5;color:#fff;font-weight:700;}
.dfy-download p{color:rgba(255,255,255,.82);font-size:14px;line-height:1.8;margin:0 0 20px;max-width:620px;}
.dfy-download-actions{display:flex;flex-wrap:wrap;gap:12px;}
.dfy-dl-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:44px;padding:10px 20px;border-radius:var(--dfy-radius-btn);
  font-size:14px;font-weight:600;color:#fff;background:rgba(255,255,255,.12);
  border:1px solid rgba(255,255,255,.34);transition:all .22s ease;
}
.dfy-dl-btn:hover{background:#fff;color:var(--dfy-primary);text-decoration:none;transform:translateY(-2px);box-shadow:0 12px 24px rgba(0,0,0,.18);}
.dfy-dl-btn:focus-visible{outline:2px solid var(--dfy-accent);outline-offset:2px;}
.dfy-dl-note{margin-top:16px;font-size:12px;color:rgba(255,255,255,.66);line-height:1.7;}
/* aside quick links */
.dfy-quick-list{list-style:none;margin:0;padding:0;display:grid;gap:2px;}
.dfy-quick-list li a{display:flex;align-items:center;justify-content:space-between;gap:10px;min-height:44px;padding:8px 0;font-size:14px;color:var(--dfy-sub);border-bottom:1px solid var(--dfy-line);}
.dfy-quick-list li:last-child a{border-bottom:0;}
.dfy-quick-list li a:hover{color:var(--dfy-primary);text-decoration:none;}
.dfy-quick-list li a:hover .dfy-arrow{transform:translateX(4px);}
.dfy-arrow{transition:transform .2s ease;color:var(--dfy-muted);}
.dfy-aside-dl li{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:10px 0;border-bottom:1px solid var(--dfy-line);font-size:14px;}
.dfy-aside-dl li:last-child{border-bottom:0;padding-bottom:0;}
.dfy-aside-dl a{color:var(--dfy-primary);font-weight:600;}
/* back link */
.dfy-back{margin-top:30px;display:flex;flex-wrap:wrap;gap:16px;justify-content:space-between;align-items:center;}
.dfy-back-link{display:inline-flex;align-items:center;gap:8px;font-size:14px;font-weight:600;color:var(--dfy-primary);min-height:44px;}
.dfy-back-link:hover{text-decoration:none;color:var(--dfy-primary-dark);}
.dfy-back-link:hover .dfy-arrow{transform:translateX(4px);}
/* footer */
.dfy-footer{background:var(--dfy-surface);border-top:1px solid var(--dfy-line);padding:64px 0 0;}
.dfy-footer-grid{display:grid;grid-template-columns:1.7fr 1fr 1fr 1.1fr;gap:36px;}
.dfy-footer-brand p{margin:14px 0 0;max-width:360px;font-size:14px;line-height:1.8;color:var(--dfy-sub);}
.dfy-footer h4{margin:0 0 14px;font-size:14px;font-weight:700;color:var(--dfy-text);line-height:1.5;}
.dfy-footer ul{list-style:none;margin:0;padding:0;}
.dfy-footer ul li{margin:0 0 10px;font-size:14px;line-height:1.7;color:var(--dfy-sub);}
.dfy-footer ul li:last-child{margin-bottom:0;}
.dfy-footer ul a{color:var(--dfy-sub);}
.dfy-footer ul a:hover{color:var(--dfy-primary);}
.dfy-footer-bottom{display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px 24px;margin-top:48px;padding:20px 0;border-top:1px solid var(--dfy-line);font-size:12px;color:var(--dfy-muted);line-height:1.7;}
.dfy-footer-bottom p{margin:0;}
@media (max-width:1024px){
  .dfy-article-layout{grid-template-columns:repeat(1,minmax(0,1fr));gap:28px;}
  .dfy-article-aside{position:static;order:2;}
  .dfy-footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:30px;}
}
@media (max-width:991px){
  .dfy-nav-toggle{display:inline-flex;}
  .dfy-nav{
    position:absolute;top:100%;left:0;right:0;z-index:1040;
    display:none;flex-direction:column;align-items:stretch;gap:0;
    margin-top:10px;padding:8px 18px 14px;
    background:#fff;border:1px solid var(--dfy-line);border-radius:14px;
    box-shadow:var(--dfy-shadow-hover);
  }
  .dfy-nav.is-open{display:flex;}
  .dfy-nav-link{padding:13px 0;border-bottom:1px solid var(--dfy-line);font-size:15px;}
  .dfy-nav-link::after{display:none;}
  .dfy-nav-cta{margin-top:14px;justify-content:center;}
  .dfy-article-body{padding:30px 26px;}
  .dfy-section{padding:52px 0;}
}
@media (max-width:768px){
  .dfy-container{padding:0 16px;}
  .dfy-post-head{padding:32px 0 26px;}
  .dfy-article-wrap{padding:28px 0 52px;}
  .dfy-article-body{padding:24px 20px;font-size:15.5px;line-height:1.85;}
  .dfy-article-body h2{font-size:20px;margin-top:28px;}
  .dfy-article-body h3{font-size:17px;}
  .dfy-summary{padding:22px 20px;}
  .dfy-download{padding:26px 22px;}
  .dfy-download-actions .dfy-dl-btn{flex:1 1 100%;}
  .dfy-footer{padding-top:48px;}
  .dfy-footer-grid{grid-template-columns:repeat(1,minmax(0,1fr));}
  .dfy-footer-bottom{flex-direction:column;align-items:flex-start;}
  .dfy-notice{padding:18px 20px;}
}
@media (max-width:520px){
  .dfy-header-inner{height:60px;}
  .dfy-logo{font-size:17px;}
  .dfy-logo-sub{display:none;}
  .dfy-post-meta{font-size:12.5px;gap:8px 14px;}
  .dfy-crumbs-current{max-width:180px;}
  .dfy-back .dfy-btn{width:100%;}
}
@media (prefers-reduced-motion:reduce){
  *{transition:none !important;animation:none !important;}
  html{scroll-behavior:auto;}
}

/* roulang page: category1 */
:root{
  --dfy-primary:#16406B;
  --dfy-primary-dark:#0F2E4E;
  --dfy-accent:#C97A2B;
  --dfy-bg:#F6F8FB;
  --dfy-surface:#FFFFFF;
  --dfy-tint:#EEF3FA;
  --dfy-line:#E3E9F1;
  --dfy-text:#14202E;
  --dfy-sub:#5A6B7F;
  --dfy-muted:#8996A6;
  --dfy-radius:16px;
  --dfy-radius-sm:12px;
  --dfy-radius-btn:10px;
  --dfy-shadow:0 1px 2px rgba(20,32,46,.04),0 8px 24px rgba(22,64,107,.06);
  --dfy-shadow-hover:0 2px 4px rgba(20,32,46,.06),0 14px 32px rgba(22,64,107,.12);
  --bs-primary:#16406B;
  --bs-body-bg:#F6F8FB;
  --bs-body-color:#14202E;
  --bs-border-color:#E3E9F1;
  --bs-border-radius:12px;
  --bs-link-color:#16406B;
  --bs-link-hover-color:#0F2E4E;
  --bs-font-sans-serif:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;
}
*{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;
  font-size:16px;
  line-height:1.85;
  color:var(--dfy-text);
  background:var(--dfy-bg);
}
a{color:var(--dfy-primary);text-decoration:none;transition:color .2s ease;}
a:hover{color:var(--dfy-primary-dark);text-decoration:underline;text-underline-offset:3px;}
img{max-width:100%;height:auto;display:block;}
button{font-family:inherit;}
h1,h2,h3,h4{color:var(--dfy-text);font-weight:700;letter-spacing:-.01em;}
.dfy-container{width:100%;max-width:1200px;margin:0 auto;padding:0 24px;}
.dfy-section{padding:72px 0;}
.dfy-section--white{background:var(--dfy-surface);}
.dfy-section--tint{background:var(--dfy-tint);}
.dfy-section[id]{scroll-margin-top:96px;}

/* header */
.dfy-header{
  position:sticky;top:0;z-index:1030;
  background:rgba(255,255,255,.95);
  border-bottom:1px solid var(--dfy-line);
  backdrop-filter:blur(6px);
  -webkit-backdrop-filter:blur(6px);
}
.dfy-header-inner{position:relative;display:flex;align-items:center;justify-content:space-between;gap:24px;height:72px;transition:height .22s ease;}
.dfy-header.is-scrolled .dfy-header-inner{height:62px;}
.dfy-logo{display:inline-flex;align-items:center;gap:10px;color:var(--dfy-primary);font-weight:700;font-size:19px;letter-spacing:.02em;min-width:0;}
.dfy-logo:hover{color:var(--dfy-primary);text-decoration:none;}
.dfy-logo-mark{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;flex:0 0 34px;border:1px solid var(--dfy-line);border-radius:10px;background:#fff;color:var(--dfy-primary);}
.dfy-logo-text{white-space:nowrap;}
.dfy-logo-sub{display:inline-block;margin-left:6px;padding:1px 8px;font-size:11px;font-weight:500;color:var(--dfy-muted);border:1px solid var(--dfy-line);border-radius:999px;vertical-align:3px;}
.dfy-nav{display:flex;align-items:center;gap:28px;}
.dfy-nav-link{position:relative;display:inline-block;padding:6px 0;font-size:15px;color:var(--dfy-sub);white-space:nowrap;}
.dfy-nav-link::after{content:"";position:absolute;left:50%;bottom:-2px;width:0;height:2px;background:var(--dfy-primary);transform:translateX(-50%);transition:width .2s ease;}
.dfy-nav-link:hover,.dfy-nav-link.is-active{color:var(--dfy-primary);text-decoration:none;}
.dfy-nav-link:hover::after,.dfy-nav-link.is-active::after{width:60%;}
.dfy-nav-cta{flex:0 0 auto;}
.dfy-nav-toggle{
  display:none;width:44px;height:44px;align-items:center;justify-content:center;
  border:1px solid var(--dfy-line);border-radius:10px;background:#fff;color:var(--dfy-primary);cursor:pointer;
}
.dfy-nav-toggle:focus-visible{outline:2px solid var(--dfy-accent);outline-offset:2px;}

/* buttons */
.dfy-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:44px;padding:11px 22px;border-radius:var(--dfy-radius-btn);
  font-size:15px;font-weight:600;line-height:1.4;border:1px solid transparent;
  cursor:pointer;transition:all .22s ease;
}
.dfy-btn:hover{text-decoration:none;}
.dfy-btn-primary{background:var(--dfy-primary);color:#fff;box-shadow:0 8px 18px rgba(22,64,107,.16);}
.dfy-btn-primary:hover{background:var(--dfy-primary-dark);color:#fff;transform:translateY(-1px);box-shadow:0 12px 24px rgba(22,64,107,.22);}
.dfy-btn-primary:active{transform:translateY(0);filter:brightness(.96);}
.dfy-btn-outline{background:#fff;border-color:var(--dfy-primary);color:var(--dfy-primary);}
.dfy-btn-outline:hover{background:var(--dfy-tint);color:var(--dfy-primary-dark);border-color:var(--dfy-primary-dark);}
.dfy-btn:focus-visible{outline:2px solid var(--dfy-accent);outline-offset:2px;}
.dfy-btn-sm{padding:8px 16px;font-size:14px;min-height:40px;}

/* category head */
.dfy-cat-head{background:var(--dfy-surface);border-bottom:1px solid var(--dfy-line);padding:60px 0 56px;}
.dfy-cat-head-grid{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:48px;align-items:start;}
.dfy-eyebrow{display:inline-block;margin-bottom:14px;padding:4px 12px;font-size:12px;font-weight:600;letter-spacing:.06em;color:var(--dfy-accent);background:rgba(201,122,43,.08);border:1px solid rgba(201,122,43,.24);border-radius:999px;}
.dfy-cat-head h1{font-size:36px;line-height:1.3;margin:0 0 20px;}
.dfy-cat-head h1 .dfy-h1-mark{color:var(--dfy-primary);}
.dfy-cat-lead p{margin:0 0 14px;font-size:16px;line-height:1.9;color:var(--dfy-sub);max-width:640px;}
.dfy-cat-lead p:last-child{margin-bottom:0;}
.dfy-toc{background:var(--dfy-surface);border:1px solid var(--dfy-line);border-radius:var(--dfy-radius);padding:24px 22px;box-shadow:var(--dfy-shadow);min-width:0;}
.dfy-toc h2{font-size:15px;margin:0 0 12px;color:var(--dfy-text);}
.dfy-toc ul{list-style:none;margin:0;padding:0;}
.dfy-toc li{border-left:1px solid var(--dfy-line);padding:0 0 0 12px;margin-bottom:2px;}
.dfy-toc li a{display:block;font-size:14px;line-height:2.2;color:var(--dfy-sub);}
.dfy-toc li a:hover{color:var(--dfy-primary);text-decoration:none;}
.dfy-toc-note{margin:14px 0 0;font-size:12px;line-height:1.75;color:var(--dfy-muted);}

/* section head */
.dfy-section-head{margin-bottom:36px;max-width:780px;}
.dfy-kicker{display:inline-block;font-size:12px;font-weight:600;letter-spacing:.08em;color:var(--dfy-accent);margin-bottom:10px;}
.dfy-section-head h2{font-size:30px;line-height:1.35;margin:0 0 12px;}
.dfy-section-desc{margin:0;color:var(--dfy-sub);font-size:15.5px;line-height:1.85;}

/* post list */
.dfy-post-list{border-top:1px solid var(--dfy-line);}
.dfy-post-card{display:grid;grid-template-columns:200px minmax(0,1fr);gap:26px;padding:26px 0;border-bottom:1px solid var(--dfy-line);align-items:start;}
.dfy-post-badge{height:120px;border-radius:var(--dfy-radius-sm);background:var(--dfy-tint);border:1px solid var(--dfy-line);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;min-width:0;}
.dfy-post-badge-num{font-size:26px;font-weight:700;color:var(--dfy-primary);font-variant-numeric:tabular-nums;letter-spacing:.02em;}
.dfy-post-badge-label{font-size:12px;color:var(--dfy-muted);}
.dfy-post-body{min-width:0;}
.dfy-post-title{margin:0 0 8px;font-size:19px;line-height:1.5;}
.dfy-post-title a{color:var(--dfy-text);}
.dfy-post-title a:hover{color:var(--dfy-primary);text-decoration:none;}
.dfy-post-excerpt{margin:0 0 12px;font-size:14.5px;line-height:1.8;color:var(--dfy-sub);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.dfy-post-meta{display:flex;flex-wrap:wrap;align-items:center;gap:10px;font-size:12px;color:var(--dfy-muted);}
.dfy-tag{display:inline-block;padding:3px 10px;font-size:12px;line-height:1.6;color:var(--dfy-primary);background:var(--dfy-tint);border-radius:999px;}
.dfy-tag--accent{color:var(--dfy-accent);background:#fff;border:1px solid rgba(201,122,43,.4);}
.dfy-empty{padding:52px 24px;text-align:center;font-size:14px;color:var(--dfy-muted);background:var(--dfy-surface);border:1px dashed var(--dfy-line);border-radius:var(--dfy-radius);}

/* generic card */
.dfy-card{background:var(--dfy-surface);border:1px solid var(--dfy-line);border-radius:var(--dfy-radius);padding:28px;box-shadow:var(--dfy-shadow);transition:all .22s ease;min-width:0;}
.dfy-card:hover{transform:translateY(-2px);box-shadow:var(--dfy-shadow-hover);}
.dfy-card h3{font-size:18px;line-height:1.5;margin:0 0 10px;}
.dfy-card p{margin:0;font-size:14.5px;line-height:1.85;color:var(--dfy-sub);}
.dfy-card-index{display:inline-block;margin-bottom:12px;font-size:12px;font-weight:700;letter-spacing:.1em;color:var(--dfy-accent);font-variant-numeric:tabular-nums;}

/* rules grid */
.dfy-rule-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px;}

/* topics */
.dfy-topic-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px;}
.dfy-topic-card{background:var(--dfy-surface);border:1px solid var(--dfy-line);border-radius:var(--dfy-radius);padding:28px;box-shadow:var(--dfy-shadow);min-width:0;}
.dfy-topic-card h3{display:flex;align-items:baseline;gap:10px;font-size:18px;margin:0 0 14px;}
.dfy-topic-card h3 span{font-size:12px;font-weight:700;color:var(--dfy-accent);letter-spacing:.08em;font-variant-numeric:tabular-nums;}
.dfy-topic-card ul{list-style:none;margin:0;padding:0;}
.dfy-topic-card li{position:relative;padding:10px 0 10px 20px;font-size:14.5px;line-height:1.8;color:var(--dfy-sub);border-top:1px solid var(--dfy-line);}
.dfy-topic-card li:first-child{border-top:0;padding-top:0;}
.dfy-topic-card li::before{content:"";position:absolute;left:0;top:19px;width:7px;height:7px;border-radius:2px;background:var(--dfy-accent);}
.dfy-topic-card li:first-child::before{top:9px;}

/* mistakes */
.dfy-mistake-list{background:var(--dfy-surface);border:1px solid var(--dfy-line);border-radius:var(--dfy-radius);box-shadow:var(--dfy-shadow);overflow:hidden;}
.dfy-mistake-row{display:grid;grid-template-columns:82px minmax(0,1fr);gap:20px;padding:24px 28px;border-top:1px solid var(--dfy-line);align-items:start;}
.dfy-mistake-row:first-child{border-top:0;}
.dfy-mistake-num{font-size:24px;font-weight:700;line-height:1.2;color:var(--dfy-accent);font-variant-numeric:tabular-nums;}
.dfy-mistake-body h3{font-size:17px;margin:0 0 6px;line-height:1.55;}
.dfy-mistake-body p{margin:0;font-size:14.5px;line-height:1.85;color:var(--dfy-sub);}

/* terms */
.dfy-term-list{background:var(--dfy-surface);border:1px solid var(--dfy-line);border-radius:var(--dfy-radius);box-shadow:var(--dfy-shadow);padding:8px 28px;}
.dfy-term-row{display:grid;grid-template-columns:200px minmax(0,1fr);gap:24px;padding:20px 0;border-top:1px solid var(--dfy-line);align-items:start;}
.dfy-term-row:first-child{border-top:0;}
.dfy-term-name{font-size:15.5px;font-weight:700;color:var(--dfy-primary);}
.dfy-term-desc{font-size:14.5px;line-height:1.85;color:var(--dfy-sub);}

/* faq */
.dfy-faq .accordion-item{background:var(--dfy-surface);border:1px solid var(--dfy-line);border-radius:14px;margin-bottom:12px;overflow:hidden;box-shadow:var(--dfy-shadow);}
.dfy-faq .accordion-item:last-child{margin-bottom:0;}
.dfy-faq .accordion-button{font-size:15px;font-weight:700;color:var(--dfy-text);background:var(--dfy-surface);padding:18px 22px;box-shadow:none;border-radius:14px;line-height:1.6;}
.dfy-faq .accordion-button:not(.collapsed){color:var(--dfy-primary);background:var(--dfy-surface);box-shadow:none;border-left:3px solid var(--dfy-primary);}
.dfy-faq .accordion-button:focus{box-shadow:none;border-color:transparent;outline:2px solid rgba(201,122,43,.45);outline-offset:-2px;}
.dfy-faq .accordion-button::after{transition:transform .2s ease;filter:grayscale(1) opacity(.6);}
.dfy-faq .accordion-body{padding:0 22px 22px;font-size:14.5px;line-height:1.9;color:var(--dfy-sub);}

/* cta / download */
.dfy-cta-band{
  background:var(--dfy-primary);color:#fff;border-radius:var(--dfy-radius);
  padding:40px 42px;display:grid;grid-template-columns:minmax(0,1fr) auto;gap:32px;align-items:center;
  box-shadow:0 18px 40px rgba(22,64,107,.16);
}
.dfy-cta-band h2{margin:0 0 10px;font-size:26px;line-height:1.4;color:#fff;}
.dfy-cta-band p{margin:0;font-size:14.5px;line-height:1.85;color:rgba(255,255,255,.82);max-width:560px;}
.dfy-cta-note{margin-top:12px !important;font-size:12px !important;color:rgba(255,255,255,.62) !important;}
.dfy-dl-group{display:flex;flex-wrap:wrap;gap:12px;}
.dfy-dl-btn{
  background:rgba(255,255,255,.10);border:1px solid rgba(255,255,255,.30);color:#fff;
  min-height:44px;padding:10px 20px;border-radius:var(--dfy-radius-btn);font-size:14px;font-weight:600;
  display:inline-flex;align-items:center;gap:8px;transition:all .22s ease;
}
.dfy-dl-btn:hover{background:#fff;color:var(--dfy-primary);text-decoration:none;transform:translateY(-2px);box-shadow:0 10px 22px rgba(0,0,0,.18);}
.dfy-dl-btn:focus-visible{outline:2px solid #fff;outline-offset:2px;}
.dfy-back-link{display:inline-flex;align-items:center;gap:8px;margin-top:26px;font-size:14px;font-weight:600;color:var(--dfy-primary);}
.dfy-back-link svg{transition:transform .2s ease;}
.dfy-back-link:hover svg{transform:translateX(4px);}

/* footer */
.dfy-footer{background:#F1F5F9;border-top:1px solid var(--dfy-line);padding:56px 0 26px;}
.dfy-footer-grid{display:grid;grid-template-columns:1.7fr 1fr 1fr 1fr;gap:36px;}
.dfy-footer-brand p{margin:16px 0 0;font-size:13.5px;line-height:1.9;color:var(--dfy-sub);max-width:360px;}
.dfy-footer h4{font-size:14px;margin:0 0 14px;color:var(--dfy-text);}
.dfy-footer ul{list-style:none;margin:0;padding:0;}
.dfy-footer li{margin-bottom:10px;font-size:13.5px;line-height:1.8;color:var(--dfy-sub);}
.dfy-footer li a{color:var(--dfy-sub);}
.dfy-footer li a:hover{color:var(--dfy-primary);}
.dfy-footer-bottom{display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;margin-top:38px;padding-top:20px;border-top:1px solid var(--dfy-line);}
.dfy-footer-bottom p{margin:0;font-size:12px;line-height:1.8;color:var(--dfy-muted);}

/* responsive */
@media (max-width:1023px){
  .dfy-cat-head-grid{grid-template-columns:minmax(0,1fr);gap:32px;}
  .dfy-toc{max-width:520px;}
  .dfy-rule-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .dfy-topic-grid{grid-template-columns:minmax(0,1fr);}
  .dfy-footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:30px;}
  .dfy-cta-band{grid-template-columns:minmax(0,1fr);}
}
@media (max-width:991px){
  .dfy-nav-toggle{display:inline-flex;}
  .dfy-nav{
    position:absolute;top:100%;left:0;right:0;
    display:none;flex-direction:column;align-items:stretch;gap:2px;
    padding:14px 24px 20px;background:#fff;
    border-bottom:1px solid var(--dfy-line);box-shadow:var(--dfy-shadow);
  }
  .dfy-nav.is-open{display:flex;}
  .dfy-nav-link{padding:12px 0;font-size:15px;border-bottom:1px solid var(--dfy-line);}
  .dfy-nav-link::after{display:none;}
  .dfy-nav-cta{margin-top:14px;width:100%;}
  .dfy-section{padding:56px 0;}
  .dfy-section-head h2{font-size:26px;}
  .dfy-cat-head h1{font-size:30px;}
}
@media (max-width:767px){
  .dfy-container{padding:0 16px;}
  .dfy-section{padding:44px 0;}
  .dfy-cat-head{padding:40px 0 40px;}
  .dfy-cat-head h1{font-size:25px;}
  .dfy-cat-lead p{font-size:15px;}
  .dfy-section-head h2{font-size:22px;}
  .dfy-post-card{grid-template-columns:minmax(0,1fr);gap:14px;}
  .dfy-post-badge{height:auto;flex-direction:row;justify-content:flex-start;gap:10px;padding:10px 16px;align-items:center;}
  .dfy-post-badge-num{font-size:18px;}
  .dfy-post-title{font-size:17px;}
  .dfy-rule-grid{grid-template-columns:minmax(0,1fr);}
  .dfy-mistake-row{grid-template-columns:minmax(0,1fr);gap:8px;padding:20px;}
  .dfy-mistake-num{font-size:20px;}
  .dfy-term-list{padding:4px 20px;}
  .dfy-term-row{grid-template-columns:minmax(0,1fr);gap:6px;padding:18px 0;}
  .dfy-cta-band{padding:28px 22px;border-radius:14px;}
  .dfy-cta-band h2{font-size:21px;}
  .dfy-dl-group{width:100%;}
  .dfy-dl-btn{width:100%;justify-content:center;}
  .dfy-footer-grid{grid-template-columns:minmax(0,1fr);gap:26px;}
  .dfy-footer{padding:40px 0 22px;}
  .dfy-footer-bottom{flex-direction:column;gap:8px;margin-top:26px;}
}
@media (max-width:520px){
  .dfy-logo{font-size:17px;}
  .dfy-logo-sub{font-size:10px;padding:1px 6px;}
  .dfy-card,.dfy-topic-card{padding:20px;}
  .dfy-btn{width:100%;}
  .dfy-nav-cta{width:100%;}
}
@media (prefers-reduced-motion:reduce){
  *{transition:none !important;animation:none !important;scroll-behavior:auto !important;}
  .dfy-card:hover,.dfy-dl-btn:hover,.dfy-btn-primary:hover{transform:none;}
}