:root{
  --bg:#f5f8f7;--card:#fff;--card-soft:#f9fbfa;--text:#18352c;--muted:#71827c;--line:#dfe9e5;
  --primary:#2f8f6b;--primary-strong:#237758;--primary-soft:#e8f5ef;--danger:#c95f5f;
  --shadow:0 18px 55px rgba(25,74,57,.08);--dark:#0b2135;--footer-text:#d4ede8;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  color:var(--text);background:radial-gradient(circle at 15% -10%,rgba(85,177,139,.16),transparent 32%),radial-gradient(circle at 88% 6%,rgba(242,166,90,.12),transparent 26%),var(--bg);min-height:100vh
}
a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}button{cursor:pointer;-webkit-tap-highlight-color:transparent}
button:focus-visible,select:focus-visible,a:focus-visible{outline:3px solid rgba(47,143,107,.2);outline-offset:2px}
[hidden]{display:none!important}.is-hidden{display:none!important}.page{width:min(1160px,calc(100% - 32px));margin:0 auto}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

/* PDF splitter same top navigation */
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.95);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.site-header .nav{height:82px;display:flex;align-items:center;gap:28px;position:relative}
.site-header .brand{display:flex;align-items:center;gap:12px;min-width:230px}
.site-header .mark{width:48px;height:48px;border-radius:14px;background:linear-gradient(145deg,#17bd92,#078d6d);color:#fff;display:grid;place-items:center;box-shadow:0 12px 24px rgba(11,155,120,.22);flex:0 0 48px}
.site-header .mark svg{width:24px;height:24px}.site-header .brand strong{display:block;color:var(--dark);font-size:21px;line-height:1.2}.site-header .brand small{display:block;color:var(--muted);font-size:13px;margin-top:4px}
.site-header .navlinks{display:flex;gap:26px;align-items:center;justify-content:center;flex:1}
.site-header .navlinks a{font-weight:700;font-size:16px;color:#405463;padding:27px 0;position:relative;transition:color .2s ease,transform .2s ease}
.site-header .navlinks a::after{content:"";position:absolute;left:50%;right:50%;bottom:18px;height:3px;border-radius:999px;background:linear-gradient(90deg,#17bd92,#078d6d);opacity:0;box-shadow:0 3px 9px rgba(11,155,120,.22);transition:.22s}
.site-header .navlinks a:hover,.site-header .navlinks a.active{color:#0b9b78;transform:translateY(-1px)}
.site-header .navlinks a:hover::after,.site-header .navlinks a.active::after{left:0;right:0;opacity:1}
.site-header .actions{display:flex;gap:10px}.site-header .btn{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:0 20px;border-radius:12px;font-weight:800;font-size:16px;border:1px solid transparent}
.site-header .btn.primary{color:#fff;background:linear-gradient(135deg,#12b58c,#078f70);box-shadow:0 10px 24px rgba(11,155,120,.2)}.site-header .btn.ghost{color:#087b61;border-color:#a3dccf;background:#fff}
.site-header .menu{display:none;margin-left:auto;background:none;border:0;width:44px;height:44px;font-size:25px;color:#405463}.mobile-share-link{display:none!important}

/* PDF splitter same Hero */
.hero{text-align:center;padding:64px 0 34px}.hero-badges{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:8px;margin-bottom:16px}
.hero-badge{display:inline-flex;align-items:center;gap:8px;padding:7px 12px;border-radius:999px;background:var(--primary-soft);color:var(--primary-strong);font-size:13px;font-weight:750}
.hero-badge::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--primary);box-shadow:0 0 0 5px rgba(47,143,107,.1)}
.hero h1{margin:0;font-size:clamp(32px,5vw,54px);line-height:1.12;letter-spacing:-.045em}.hero-title-link{transition:color .18s}.hero-title-link:hover{color:var(--primary-strong)}
.feature-update{margin-top:12px;color:#709087;font-size:13px;font-weight:700}.hero p{width:min(850px,100%);margin:18px auto 0;font-size:17px;line-height:1.8;color:var(--muted)}

/* Tool shell */
.tool-shell{background:rgba(255,255,255,.9);border:1px solid rgba(217,231,225,.92);box-shadow:var(--shadow);border-radius:28px;overflow:hidden;margin-bottom:28px}
.tool-tabs{display:flex;gap:4px;padding:14px 20px 0;border-bottom:1px solid var(--line);background:#fbfefd}
.tool-tab{border:0;background:transparent;padding:14px 22px;border-radius:12px 12px 0 0;color:#61766e;font-weight:800;font-size:16px}
.tool-tab.active{background:var(--primary-soft);color:var(--primary-strong)}
.tool-main{padding:28px}.tool-panel{display:block}
.input-control-panel,.result-side{border:1px solid var(--line);border-radius:20px;background:linear-gradient(180deg,#fbfdfc,#f7fbf9);padding:24px}
.result-side{margin-top:20px;background:linear-gradient(180deg,#fbfffd,#f3faf7)}
.input-control-head{display:flex;align-items:flex-start;justify-content:space-between;gap:22px;margin-bottom:20px}
.section-kicker{color:var(--primary);font-size:12px;font-weight:850;letter-spacing:.09em;text-transform:uppercase}
.input-control-head h2,.result-heading h2{margin:5px 0 5px;font-size:24px;letter-spacing:-.02em}.input-control-head p{margin:0;color:var(--muted);font-size:13px;line-height:1.7}
.input-control-note{flex:0 0 auto;background:var(--primary-soft);color:var(--primary-strong);border-radius:999px;padding:8px 12px;font-size:12px;font-weight:750}
.input-control-grid{display:grid;grid-template-columns:minmax(300px,1.4fr) minmax(190px,.75fr) minmax(205px,.9fr);gap:14px;align-items:end}
.input-control-grid.has-custom-date{grid-template-columns:minmax(280px,1.35fr) minmax(190px,.7fr) minmax(280px,1.2fr) minmax(190px,.75fr)}
.diff-input-grid{grid-template-columns:minmax(300px,1fr) minmax(300px,1fr) minmax(200px,.65fr)}
.field>span,.field-label{display:block;color:#365d53;font-size:13px;font-weight:800;margin-bottom:8px}
.date-select-group{display:grid;grid-template-columns:1.35fr .85fr .85fr;gap:8px}.date-select-group label{position:relative;min-width:0}
.date-select-group select{width:100%;height:48px;border:1px solid #cfded8;border-radius:12px;background:#fff;color:var(--text);font-weight:750;padding:0 34px 0 12px;appearance:none;-webkit-appearance:none}
.date-select-group label::after{content:"⌄";position:absolute;right:30px;top:50%;transform:translateY(-55%);color:#4c7365;font-size:16px;pointer-events:none}
.date-select-group em{position:absolute;right:10px;top:50%;transform:translateY(-50%);font-style:normal;color:#6c847b;font-size:12px;pointer-events:none}
.calc-date-row{min-width:0}.segmented{display:grid;grid-template-columns:1fr 1fr;border:1px solid #cfded8;border-radius:12px;padding:4px;background:#fff;height:48px}
.segmented label{position:relative}.segmented input{position:absolute;opacity:0;pointer-events:none}.segmented span{display:grid;place-items:center;height:38px;border-radius:9px;color:#61766e;cursor:pointer}
.segmented input:checked+span{background:var(--primary-soft);color:var(--primary-strong);font-weight:850}
.calculate-action .primary-btn{width:100%}.primary-btn,.ghost-btn{min-height:48px;border-radius:12px;font-weight:800;border:1px solid transparent;padding:0 17px}
.primary-btn{background:linear-gradient(135deg,#12b58c,#078f70);color:#fff;box-shadow:0 10px 24px rgba(11,155,120,.18)}
.primary-btn:hover{filter:brightness(.98);transform:translateY(-1px)}.ghost-btn{background:#fff;border-color:#cfe1da;color:var(--primary-strong)}
.input-control-foot{display:flex;align-items:flex-start;gap:14px;margin-top:14px}.privacy-tip{margin:0;color:#7c9189;font-size:11px;line-height:1.65;flex:1}
.error-box{padding:10px 12px;border-radius:11px;background:#fff0f0;border:1px solid #f3cece;color:#b74747;font-size:12px;line-height:1.55;flex:1}

/* Results */
.empty-result{min-height:280px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;color:var(--muted)}
.empty-icon{width:58px;height:58px;border-radius:18px;background:var(--primary-soft);display:grid;place-items:center;color:var(--primary);font-size:24px;margin-bottom:12px}
.empty-result h3{margin:0 0 4px;color:var(--text);font-size:19px}.empty-result p{max-width:480px;margin:0;font-size:13px}
.result-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:14px;margin-bottom:16px}
.age-summary-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:12px}.summary-card{border:1px solid var(--line);background:#fff;border-radius:16px;padding:17px}
.summary-card.emphasis{background:linear-gradient(145deg,var(--primary-soft),#fff)}.summary-card span,.summary-card small{display:block;color:var(--muted);font-size:11px}
.summary-card strong{display:block;font-size:29px;line-height:1.25;margin:5px 0;color:#0d4f3c}
.info-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:12px}.info-grid.four{grid-template-columns:repeat(4,1fr)}
.info-card{display:flex;gap:10px;align-items:flex-start;background:#fff;border:1px solid var(--line);border-radius:15px;padding:13px;min-width:0}
.info-icon{flex:0 0 34px;height:34px;border-radius:10px;background:var(--primary-soft);color:var(--primary);display:grid;place-items:center;font-size:12px;font-weight:850}
.info-card div{min-width:0}.info-card small{display:block;color:var(--muted);font-size:10px}.info-card strong{display:block;margin:2px 0;font-size:15px;overflow-wrap:anywhere}.info-card p{margin:0;color:var(--muted);font-size:10px;line-height:1.55}
.birthday-card{background:#fff;border:1px solid var(--line);border-radius:17px;padding:16px;margin-bottom:12px}.birthday-top{display:flex;justify-content:space-between;gap:16px;align-items:center}
.birthday-top small{color:var(--muted);font-size:11px}.birthday-top strong{display:block;font-size:26px;color:#0d4f3c;margin:3px 0}.birthday-top p{margin:0;color:var(--muted);font-size:11px}
.birthday-age{padding:8px 11px;border-radius:11px;background:var(--primary-soft);color:var(--primary-strong);font-weight:800;font-size:12px}
.progress-track{height:9px;border-radius:999px;background:#e3eee8;overflow:hidden;margin-top:14px}.progress-track span{display:block;width:0;height:100%;background:linear-gradient(90deg,var(--primary),#53b981);border-radius:inherit;transition:width .35s}
.progress-meta{display:flex;justify-content:space-between;gap:8px;color:#83958e;font-size:9px;margin-top:6px}
.life-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:12px}.life-grid article{background:#fff;border:1px solid var(--line);border-radius:15px;padding:13px;text-align:center}
.life-grid small{display:block;color:var(--muted);font-size:10px}.life-grid strong{font-size:22px;color:#0d4f3c;margin-right:3px}.life-grid span{font-size:11px;color:var(--muted)}
.detail-list{background:#fff;border:1px solid var(--line);border-radius:15px;overflow:hidden}.detail-list div{display:flex;justify-content:space-between;gap:15px;padding:10px 13px;border-bottom:1px solid #edf3f0;font-size:12px}
.detail-list div:last-child{border-bottom:0}.detail-list span{color:var(--muted)}.detail-list strong{text-align:right}.notice-card{margin-top:12px;border-radius:14px;background:#f8fcfa;border:1px dashed #cce4da;padding:12px 13px}
.notice-card strong{font-size:12px}.notice-card p{margin:3px 0 0;color:var(--muted);font-size:11px;line-height:1.65}
.diff-main-card{margin:0 0 12px;background:linear-gradient(145deg,var(--primary-soft),#fff);border:1px solid var(--line);border-radius:17px;padding:22px;text-align:center}
.diff-main-card small{color:var(--muted)}.diff-main-card strong{display:block;font-size:28px;color:#0d4f3c;margin-top:4px}

/* PDF splitter same feature cards / help / FAQ */
.feature-strip{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:28px 0}.feature-strip article{display:flex;align-items:flex-start;gap:12px;background:rgba(255,255,255,.78);border:1px solid var(--line);border-radius:17px;padding:17px}
.feature-icon{width:38px;height:38px;border-radius:12px;display:grid;place-items:center;flex:0 0 38px;background:var(--primary-soft);color:var(--primary);font-size:12px;font-weight:850}
.feature-strip strong{display:block;font-size:14px}.feature-strip p{margin:5px 0 0;color:var(--muted);font-size:11px;line-height:1.6}
.content-card{background:rgba(255,255,255,.82);border:1px solid var(--line);border-radius:22px;box-shadow:0 12px 38px rgba(25,74,57,.045);padding:28px;margin:26px 0}
.content-head{text-align:center;max-width:720px;margin:0 auto 22px}.content-head h2{margin:6px 0 4px;font-size:23px}.content-head p{margin:0;color:var(--muted);font-size:13px}
.steps-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.steps-grid article{border:1px solid var(--line);border-radius:16px;padding:18px;background:#fff}
.steps-grid article>span{display:inline-grid;place-items:center;width:32px;height:32px;border-radius:10px;background:var(--primary-soft);color:var(--primary-strong);font-weight:850;font-size:12px}
.steps-grid h3{margin:14px 0 6px;font-size:15px}.steps-grid p,.faq-card details p{margin:0;color:var(--muted);font-size:12px;line-height:1.75}
.faq-card details{border-top:1px solid var(--line);padding:15px 2px}.faq-card details:last-child{border-bottom:1px solid var(--line)}
.faq-card summary{cursor:pointer;font-weight:750;font-size:14px;list-style:none;position:relative;padding-right:28px}.faq-card summary::-webkit-details-marker{display:none}
.faq-card summary::after{content:"+";position:absolute;right:4px;top:50%;transform:translateY(-50%);font-size:20px;color:#6d887e;font-weight:400}.faq-card details[open] summary::after{content:"−"}.faq-card details p{margin-top:9px}

/* PDF splitter same deep green footer */
.site-footer{margin-top:48px;background:linear-gradient(135deg,#063f41,#07574d);border-top:0;color:var(--footer-text);padding:56px 0 26px}
.footer-grid{display:grid;grid-template-columns:1.7fr repeat(3,1fr);gap:36px}.site-footer .footer-brand .brand{display:inline-flex;align-items:center;gap:11px;color:inherit}
.site-footer .footer-brand .brand-mark{width:48px;height:48px;border-radius:14px;display:grid;place-items:center;background:linear-gradient(145deg,#17bd92,#078d6d);color:#fff;box-shadow:0 12px 24px rgba(11,155,120,.22)}
.site-footer .footer-brand .brand-mark svg{width:24px;height:24px}.site-footer .footer-brand .brand-copy{display:grid;line-height:1.12;gap:3px}.site-footer .footer-brand .brand-copy strong{color:#fff;font-size:21px;line-height:1.2}
.site-footer .footer-brand .brand-copy small,.site-footer .footer-brand p{color:#b9d6d0}.footer-brand p{max-width:350px;font-size:12px;line-height:1.7}
.footer-pills{display:flex;flex-wrap:wrap;gap:7px}.site-footer .footer-pills span{color:#d4ede8;background:transparent;border:1px solid rgba(255,255,255,.16);padding:5px 8px;border-radius:999px;font-size:10px;font-weight:700}
.footer-grid h3{color:#fff;font-size:13px;margin:4px 0 12px}.footer-grid>div:not(.footer-brand){display:flex;flex-direction:column;gap:9px}.footer-grid a{color:#c4dfda;font-size:12px}.footer-grid a:hover{color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.13);margin-top:30px;padding-top:17px;display:flex;justify-content:space-between;gap:20px;color:#b6d2cd;font-size:11px}.footer-bottom p{margin:0}

/* PDF splitter same share modal / top button */
.share-modal{position:fixed;inset:0;z-index:2200;display:none;align-items:center;justify-content:center;padding:20px;background:rgba(5,35,33,.48);backdrop-filter:blur(6px)}.share-modal.show{display:flex}
.share-dialog{width:min(520px,100%);border-radius:22px;background:#fff;overflow:hidden;box-shadow:0 24px 70px rgba(5,50,43,.22)}
.share-dialog-head{padding:18px 20px;border-bottom:1px solid #e4efeb;display:flex;align-items:flex-start;justify-content:space-between;gap:15px;background:linear-gradient(180deg,#fbfefd,#f7fbfa)}
.share-dialog-head strong{display:block;color:#193f34;font-size:17px}.share-dialog-head span{display:block;margin-top:4px;color:#758a82;font-size:12px}.share-close{width:34px;height:34px;border-radius:10px;border:1px solid #dce9e4;background:#fff;color:#60766e;font-size:22px}
.share-dialog-body{padding:20px}.share-qr-row{display:flex;gap:17px;align-items:center}.share-qr-box{width:128px;height:128px;padding:7px;border:1px solid #dde8e2;border-radius:14px;background:#fff;flex:0 0 auto}.share-qr-box img{display:block;width:100%;height:100%}
.share-copy h3{margin:0;font-size:17px;color:#264a3f}.share-copy p{margin:5px 0 0;color:#6b7f74;font-size:12px;line-height:1.7}
.share-link-box{display:flex;gap:8px;margin-top:16px;border:1px solid #dce8e1;background:#f9fcfa;border-radius:12px;padding:6px 6px 6px 10px;align-items:center}.share-link-text{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:11px;color:#61786b;flex:1}
.share-action{border:1px solid #cfe2d7;background:#fff;color:#276147;border-radius:9px;min-height:36px;padding:0 12px;font-weight:700}.share-dialog-actions{margin-top:9px}.share-action.primary{background:var(--primary);color:#fff;border-color:var(--primary);width:100%}.share-privacy{text-align:center;color:#87988f;font-size:10px;margin-top:10px}
.topbtn{position:fixed;right:22px;bottom:22px;width:44px;height:44px;border-radius:14px;border:1px solid #d6e5de;background:rgba(255,255,255,.92);color:var(--primary);box-shadow:0 10px 28px rgba(24,53,44,.12);display:grid;place-items:center;opacity:0;transform:translateY(10px);pointer-events:none;transition:.18s;z-index:20}.topbtn.show{opacity:1;transform:none;pointer-events:auto}.topbtn svg{width:22px;height:22px}
.toast{position:fixed;left:50%;bottom:26px;transform:translate(-50%,20px);background:#18352c;color:#fff;padding:10px 14px;border-radius:10px;font-size:12px;opacity:0;visibility:hidden;pointer-events:none;transition:.2s;z-index:2300;box-shadow:0 10px 30px rgba(0,0,0,.16)}.toast.show{opacity:1;visibility:visible;transform:translate(-50%,0)}

@media(max-width:1020px){
  .input-control-grid,.input-control-grid.has-custom-date,.diff-input-grid{grid-template-columns:1fr 1fr}.calculate-action{grid-column:1/-1}.calculate-action .primary-btn{width:100%}
  .feature-strip{grid-template-columns:repeat(2,1fr)}.footer-grid{grid-template-columns:1.4fr 1fr 1fr}.footer-grid>div:last-child{display:none}.info-grid.four{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:1000px){
  .site-header .actions{display:none}.site-header .menu{display:block}.site-header .navlinks{display:none;position:fixed;left:0;right:0;top:74px;width:100vw;max-width:none;margin:0;padding:12px 0 16px;border:0;border-top:1px solid var(--line);background:rgba(255,255,255,.985);box-shadow:0 18px 38px rgba(13,75,61,.11);flex-direction:column;align-items:stretch;gap:0;max-height:calc(100vh - 74px);overflow-y:auto}
  .site-header .navlinks.open{display:flex}.site-header .navlinks a{display:block;width:100%;padding:13px 28px;transform:none}.site-header .navlinks a::after{display:none}.mobile-share-link{display:block!important}
}
@media(max-width:760px){
  .page{width:min(100% - 22px,1160px)}.site-header .nav{height:74px;gap:12px}.site-header .brand{min-width:0}.site-header .mark{width:44px;height:44px;border-radius:13px;flex-basis:44px}.site-header .brand strong{font-size:17px}.site-header .brand small{font-size:11px}
  .hero{padding:43px 0 24px}.hero h1{font-size:34px}.hero p{font-size:14px;line-height:1.75}.hero-badge{font-size:11px;padding:6px 9px}.tool-shell{border-radius:20px}.tool-main{padding:15px}.tool-tabs{padding-left:10px;padding-right:10px}
  .input-control-panel,.result-side{padding:16px;border-radius:16px}.input-control-head{flex-direction:column}.input-control-note{align-self:flex-start}.input-control-grid,.input-control-grid.has-custom-date,.diff-input-grid{grid-template-columns:1fr}.calculate-action{grid-column:auto}
  .date-select-group{grid-template-columns:1.25fr .85fr .85fr}.input-control-foot{flex-direction:column}.error-box{width:100%}.age-summary-grid{grid-template-columns:1fr}.info-grid.four{grid-template-columns:1fr 1fr}.life-grid{gap:7px}.life-grid article{padding:11px 5px}.life-grid strong{font-size:18px}
  .feature-strip{grid-template-columns:1fr;gap:9px}.content-card{padding:20px 16px}.steps-grid{grid-template-columns:1fr 1fr}.footer-grid{grid-template-columns:1fr 1fr;gap:28px 18px}.footer-grid .footer-brand{grid-column:1/-1}.footer-grid>div:last-child{display:flex}.footer-bottom{flex-direction:column;gap:7px}.share-qr-row{align-items:flex-start}.share-qr-box{width:122px;height:122px}.topbtn{right:14px;bottom:14px}
}
@media(max-width:480px){
  .site-header .brand{gap:9px}.site-header .mark{width:43px;height:43px;flex-basis:43px}.site-header .brand strong{font-size:16px}.site-header .brand small{font-size:10px}.hero-badge{font-size:10px}.hero h1{font-size:31px}
  .tool-tab{padding:12px 15px;font-size:14px}.date-select-group{grid-template-columns:1.2fr .9fr .9fr;gap:6px}.date-select-group select{padding-left:9px;padding-right:30px}.date-select-group label::after{right:27px}.date-select-group em{right:8px}
  .info-grid.four{grid-template-columns:1fr}.steps-grid{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr}.footer-grid .footer-brand{grid-column:auto}.share-dialog-body{padding:17px}.share-qr-row{display:block}.share-qr-box{margin:0 auto}.share-copy{text-align:center;margin-top:12px}
  .detail-list div{font-size:11px}.progress-meta{font-size:8px}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}