:root{--dk-ink: #10352d;--dk-accent: #d9894f;--dk-copper: #d9894f;--dk-copper-hover: #c8763b;--dk-copper-soft: #fbeadc;--dk-copper-text: #8a4a1c;--dk-patina: #5e9c88;--dk-patina-soft: #e4efea;--dk-night: #0b211c;--dk-night-2: #12302a;--dk-canvas: #f4f6f5;--dk-paper: #ffffff;--dk-muted: #4f5d59;--dk-hair: color-mix(in srgb, #10352d 13%, transparent);--dk-soft: #eaefed;--dk-warn: #b4441c;--dk-warn-soft: #fbe7dd;--dk-ok: #2f7a5f;--dk-ok-soft: #e1f1ea;--dk-err: #b3261e;--dk-radius: 10px;--dk-radius-lg: 18px;--dk-shadow: 0 1px 2px rgba(16, 53, 45, .06), 0 16px 36px -22px rgba(16, 53, 45, .42);--dk-ease: cubic-bezier(.2, .7, .2, 1);--dk-font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Roboto, "Noto Sans SC", "Source Han Sans SC", "Helvetica Neue", Arial, sans-serif;--dk-num: "SF Pro Display", "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", sans-serif;--dk-wrap: 1160px;--dk-measure: 66ch;--dk-s2: 8px;--dk-s3: 14px;--dk-s4: 22px;--dk-s5: 32px;--dk-s6: 56px;--dk-s7: 92px}*,*:before,*:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}body{margin:0;background:var(--dk-canvas);color:var(--dk-ink);font-family:var(--dk-font);font-size:16px;line-height:1.65;-webkit-font-smoothing:antialiased}img{max-width:100%;height:auto;display:block}h1,h2,h3{line-height:1.22;letter-spacing:-.02em;margin:0 0 var(--dk-s4);text-wrap:balance}h1{font-size:clamp(2rem,1.35rem + 2.6vw,3.15rem)}h2{font-size:clamp(1.35rem,1.15rem + 1vw,1.95rem)}h3{font-size:1.12rem}p{margin:0 0 var(--dk-s4);max-width:var(--dk-measure)}a{color:var(--dk-accent);text-underline-offset:3px}.wrap{width:100%;max-width:var(--dk-wrap);margin-inline:auto;padding-inline:var(--dk-s5)}.skip{position:absolute;left:-9999px;top:0;z-index:100;background:var(--dk-paper);padding:var(--dk-s3) var(--dk-s4);border-radius:var(--dk-radius);border:1px solid var(--dk-hair)}.skip:focus{left:var(--dk-s4);top:var(--dk-s4)}:where(a,button,input,textarea):focus-visible{outline:2px solid var(--dk-accent);outline-offset:2px}.dk-top{position:sticky;top:0;z-index:30;background:color-mix(in srgb,var(--dk-canvas) 90%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--dk-hair)}.dk-top .wrap{display:flex;align-items:center;justify-content:space-between;gap:var(--dk-s4);min-height:64px}.dk-logo{display:inline-flex;align-items:center;gap:var(--dk-s3);color:var(--dk-ink);text-decoration:none;font-weight:650;letter-spacing:-.02em}.dk-logo span{display:flex;flex-direction:column;line-height:1.2}.dk-logo small{font-size:.72rem;font-weight:450;color:var(--dk-muted);letter-spacing:0}.dk-nav{display:flex;gap:var(--dk-s5);align-items:center}.dk-nav a{color:var(--dk-muted);text-decoration:none;font-size:.94rem;padding:var(--dk-s2) 0;border-bottom:2px solid transparent}.dk-nav a:hover{color:var(--dk-ink)}.dk-nav a[aria-current=page]{color:var(--dk-ink);border-bottom-color:var(--dk-accent)}.dk-menu{display:none;background:none;border:1px solid var(--dk-hair);border-radius:var(--dk-radius);padding:6px 12px;font:inherit;font-size:.9rem;color:var(--dk-ink);cursor:pointer}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--dk-s2);padding:11px 20px;border-radius:var(--dk-radius);text-decoration:none;font-weight:600;font-size:.96rem;border:1px solid transparent;cursor:pointer;font-family:inherit}.btn-solid{background:var(--dk-ink);color:var(--dk-canvas)}.btn-solid:hover{background:color-mix(in srgb,var(--dk-ink) 84%,var(--dk-accent));color:#fff}.btn-line{background:transparent;color:var(--dk-ink);border-color:var(--dk-hair)}.btn-line:hover{border-color:var(--dk-accent);color:var(--dk-accent)}.hero{padding:var(--dk-s6) 0 var(--dk-s5)}.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:var(--dk-s6);align-items:start}.hero-eyebrow{font-size:.8rem;letter-spacing:.12em;text-transform:uppercase;color:var(--dk-accent);font-weight:700;margin-bottom:var(--dk-s3)}.hero-actions{display:flex;flex-wrap:wrap;gap:var(--dk-s3);margin-top:var(--dk-s5)}.hero-points{margin:0 0 var(--dk-s4);padding-left:1.1em;color:var(--dk-muted);font-size:.96rem}.hero-points li{margin-bottom:6px}.calc-shell{background:var(--dk-paper);border:1px solid var(--dk-hair);border-radius:var(--dk-radius);padding:var(--dk-s5);box-shadow:0 18px 44px -28px color-mix(in srgb,var(--dk-ink) 45%,transparent)}.calc-head h2{margin-bottom:var(--dk-s2);font-size:1.35rem}.calc-head p{font-size:.9rem;color:var(--dk-muted);margin-bottom:var(--dk-s4)}.calc-form{display:grid;gap:var(--dk-s3)}.field{display:flex;flex-direction:column;gap:6px}.field label{font-size:.9rem;font-weight:600}.field input{width:100%;min-height:46px;padding:11px 13px;font:inherit;font-size:.98rem;border:1px solid var(--dk-hair);border-radius:var(--dk-radius);background:var(--dk-canvas);color:var(--dk-ink)}.field input::placeholder{color:color-mix(in srgb,var(--dk-ink) 38%,transparent)}.field input[aria-invalid=true]{border-color:#b3402f}.field-row{display:grid;grid-template-columns:1fr 1fr;gap:var(--dk-s3)}.err{margin:0;font-size:.84rem;color:#b3402f}.calc-actions{display:flex;flex-wrap:wrap;align-items:center;gap:var(--dk-s3);margin-top:var(--dk-s3)}.calc-status{margin:var(--dk-s3) 0 0;font-size:.88rem;color:var(--dk-muted);min-height:1.4em}.result{margin-top:var(--dk-s5);padding-top:var(--dk-s4);border-top:1px solid var(--dk-hair)}.result h3{margin-bottom:var(--dk-s3)}.result-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:var(--dk-s3);margin:0 0 var(--dk-s3)}.result-grid>div{background:var(--dk-soft);border-radius:var(--dk-radius);padding:var(--dk-s3);min-width:0}.result-grid dt{font-size:.82rem;color:var(--dk-muted);margin-bottom:2px}.result-grid dd{margin:0;font-size:1.14rem;font-weight:700;letter-spacing:-.01em;word-break:break-all}.result-grid .result-main{grid-column:1 / -1;background:color-mix(in srgb,var(--dk-accent) 12%,var(--dk-paper))}.result-grid .result-main dd{font-size:1.6rem}.result-note{font-size:.84rem;color:var(--dk-muted);margin:0 0 var(--dk-s3)}.copy-status{font-size:.86rem;color:var(--dk-muted)}.band{padding:var(--dk-s6) 0;border-top:1px solid var(--dk-hair)}.band-soft{background:var(--dk-soft)}.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:var(--dk-s4)}.card{background:var(--dk-paper);border:1px solid var(--dk-hair);border-radius:var(--dk-radius);padding:var(--dk-s4)}.card h3{margin-bottom:var(--dk-s2)}.card p{font-size:.94rem;color:var(--dk-muted);margin-bottom:var(--dk-s2)}.list-plain{margin:0;padding-left:1.1em;font-size:.92rem;color:var(--dk-muted)}.list-plain li{margin-bottom:4px}.formula-note{margin-top:var(--dk-s5);background:var(--dk-paper);border:1px solid var(--dk-hair);border-radius:var(--dk-radius);padding:var(--dk-s4)}.formula-note h3{margin-bottom:var(--dk-s2)}.formula-note .list-plain{color:var(--dk-ink)}.steps{counter-reset:st;display:grid;gap:var(--dk-s3)}.step{counter-increment:st;display:grid;grid-template-columns:38px 1fr;gap:var(--dk-s3);align-items:start}.step:before{content:counter(st);width:30px;height:30px;border-radius:50%;background:var(--dk-soft);color:var(--dk-accent);display:grid;place-items:center;font-weight:700;font-size:.88rem}.step b{display:block}.step p{margin:2px 0 0;font-size:.94rem;color:var(--dk-muted)}.foot-note{color:var(--dk-muted);font-size:.88rem;margin:0}.doc{max-width:72ch}.doc h2{margin-top:var(--dk-s5)}.doc ul{padding-left:1.2em}.doc li{margin-bottom:6px}.doc ol{padding-left:1.4em}.doc ol li{margin-bottom:8px}.doc .meta{font-size:.85rem;color:var(--dk-muted);margin-bottom:var(--dk-s5)}.doc article h1{margin-bottom:var(--dk-s3)}.dk-foot{border-top:1px solid var(--dk-hair);padding:var(--dk-s5) 0 var(--dk-s6);font-size:.88rem;color:var(--dk-muted)}.dk-foot .wrap{display:flex;flex-wrap:wrap;gap:var(--dk-s4);justify-content:space-between}.dk-foot nav{display:flex;gap:var(--dk-s4);flex-wrap:wrap}.dk-foot a{color:var(--dk-muted)}@media(max-width:900px){.hero-grid{grid-template-columns:1fr;gap:var(--dk-s5)}}@media(max-width:760px){.dk-menu{display:inline-flex}.dk-nav{display:none;width:100%;flex-direction:column;align-items:flex-start;gap:var(--dk-s2);padding:var(--dk-s3) 0}.dk-nav.open{display:flex}.dk-top .wrap{flex-wrap:wrap}.wrap{padding-inline:var(--dk-s4)}.calc-shell{padding:var(--dk-s4)}.field-row,.result-grid{grid-template-columns:1fr}.result-grid .result-main dd{font-size:1.35rem}}fieldset.field{border:1px solid var(--dk-hair);border-radius:var(--dk-radius);padding:var(--dk-s3);margin:0;gap:8px}fieldset.field legend{font-size:.9rem;font-weight:600;padding:0 4px}fieldset.field label{font-weight:450;display:flex;gap:8px;align-items:flex-start;line-height:1.5}fieldset.field input[type=radio],fieldset.field input[type=checkbox]{width:auto;min-height:0;margin-top:4px;flex:none}.field select{width:100%;min-height:46px;padding:10px 12px;font:inherit;font-size:.98rem;border:1px solid var(--dk-hair);border-radius:var(--dk-radius);background:var(--dk-canvas);color:var(--dk-ink)}.field textarea{width:100%;min-height:96px;padding:11px 13px;font:inherit;font-size:.98rem;resize:vertical;border:1px solid var(--dk-hair);border-radius:var(--dk-radius);background:var(--dk-canvas);color:var(--dk-ink)}:where(select):focus-visible{outline:2px solid var(--dk-accent);outline-offset:2px}[hidden]{display:none!important}.step>div{min-width:0}.step p,.step b,.card p{overflow-wrap:anywhere}body{background:var(--dk-canvas)}html{scroll-padding-top:84px}h1,h2{font-weight:650;letter-spacing:-.025em}.num,.br-table dd,.dk-method-num b,.br-gauge-h b{font-variant-numeric:tabular-nums}.dk-top{transition:background-color .3s var(--dk-ease),border-color .3s var(--dk-ease)}.dk-logo{gap:10px}.dk-logo span{flex-direction:row;align-items:baseline;gap:2px;font-weight:500;font-size:.95rem;color:var(--dk-muted)}.dk-logo b{font-weight:700;font-size:1.12rem;color:var(--dk-ink);letter-spacing:-.02em}.dk-logo i{font-style:normal;color:var(--dk-copper);padding:0 2px}.dk-logo-av,.dk-logo .dxb-av3d{flex:none}.dk-nav-ask{display:inline-flex;align-items:center;gap:6px;padding:6px 14px 6px 8px!important;border-radius:999px;border:1px solid var(--dk-hair)!important;color:var(--dk-ink)!important;font-weight:600;transition:border-color .2s,background-color .2s}.dk-nav-ask:hover{border-color:var(--dk-copper)!important;background:var(--dk-copper-soft)}.dk-top.on-photo{position:fixed;left:0;right:0;background:transparent;border-bottom-color:transparent;backdrop-filter:none}.dk-top.on-photo:not(.is-solid) .dk-logo b,.dk-top.on-photo:not(.is-solid) .dk-nav a{color:#fff}.dk-top.on-photo:not(.is-solid) .dk-logo span{color:#ffffffc7}.dk-top.on-photo:not(.is-solid) .dk-nav a[aria-current=page]{border-bottom-color:var(--dk-copper)}.dk-top.on-photo:not(.is-solid) .dk-nav-ask{color:#fff!important;border-color:#ffffff59!important}.dk-top.on-photo:not(.is-solid) .dk-nav-ask:hover{background:#ffffff1a}.dk-top.on-photo:not(.is-solid) .dk-menu{color:#fff;border-color:#fff6}.dk-top.on-photo.is-solid{background:color-mix(in srgb,var(--dk-canvas) 94%,transparent);backdrop-filter:blur(10px);border-bottom-color:var(--dk-hair)}.btn{border-radius:999px;transition:background-color .2s var(--dk-ease),transform .2s var(--dk-ease),box-shadow .2s var(--dk-ease),border-color .2s}.btn:active{transform:translateY(1px)}.btn-copper{background:var(--dk-copper);color:var(--dk-ink);font-weight:700}.btn-copper:hover{background:var(--dk-copper-hover);box-shadow:0 10px 24px -14px #c8763be6}.btn-ink{background:var(--dk-ink);color:#fff}.btn-ink:hover{background:color-mix(in srgb,var(--dk-ink) 86%,#fff)}.btn-ghost{background:none;color:var(--dk-muted);border-color:transparent}.btn-ghost:hover{color:var(--dk-ink)}.btn-av,.btn .dxb-av3d{flex:none;margin-left:-4px}.dk-hero{position:relative;min-height:min(780px,100svh);display:flex;align-items:flex-end;color:#fff;background:var(--dk-night) var(--hero) 72% 30% / cover no-repeat;padding:120px 0 56px;overflow:hidden;isolation:isolate}.dk-hero:before{content:"";position:absolute;inset:0;z-index:-1;background:linear-gradient(90deg,#081c17f0,#081c17db 34%,#081c1759 62%,#081c1726),linear-gradient(0deg,#081c17bf,#081c1700 38%)}.dk-hero:after{content:"";position:absolute;inset:0 0 auto;height:140px;z-index:-1;background:linear-gradient(180deg,rgba(8,28,23,.6),transparent)}.dk-hero-grid{display:grid;grid-template-columns:minmax(0,1.08fr) minmax(0,.92fr);gap:var(--dk-s5);align-items:end}.dk-eyebrow{font-size:.8rem;letter-spacing:.16em;color:#f0b98b;font-weight:600;margin-bottom:var(--dk-s3)}.dk-hero h1{font-size:clamp(2.2rem,1.4rem + 3vw,3.6rem);font-weight:650;line-height:1.12;margin-bottom:var(--dk-s4)}.dk-h1-sub{color:#f2c5a0}.dk-lede{font-size:1.04rem;color:#ffffffdb;max-width:34em}.dk-quick{display:flex;flex-wrap:wrap;gap:8px;align-items:stretch;background:#fffffff7;border-radius:18px;padding:8px;max-width:560px;box-shadow:0 24px 50px -24px #0009}.dk-quick-field{flex:1 1 170px;display:flex;align-items:center;gap:6px;padding:4px 12px;border-radius:12px;background:var(--dk-canvas);color:var(--dk-ink);min-width:0}.dk-quick-field span{font-size:.84rem;font-weight:600;color:var(--dk-muted);white-space:nowrap}.dk-quick-field em{font-style:normal;font-size:.86rem;color:var(--dk-muted)}.dk-quick-field input{flex:1;min-width:0;width:100%;border:0;background:none;font:inherit;font-size:1.1rem;font-weight:650;color:var(--dk-ink);padding:10px 0;font-variant-numeric:tabular-nums}.dk-quick-field input:focus{outline:none}.dk-quick-field:focus-within{box-shadow:0 0 0 2px var(--dk-copper)}.dk-quick .btn{flex:0 0 auto;padding-inline:26px;font-size:1.02rem}.dk-quick-hint{font-size:.84rem;color:#ffffffb3;margin-top:var(--dk-s3);max-width:560px}.dk-mascot{position:relative;margin:0;width:100%;max-width:520px;aspect-ratio:1;justify-self:end}.dk-mascot-canvas{position:absolute;inset:0;width:100%!important;height:100%!important;cursor:pointer;touch-action:manipulation}.dk-mascot-still{position:absolute;inset:8%;width:84%;height:84%;object-fit:contain}.dk-mascot.is-3d .dk-mascot-still{display:none}.dk-mascot.no-3d .dk-mascot-still{display:block}.dk-mascot figcaption{position:absolute;left:50%;bottom:2%;transform:translate(-50%);font-size:.8rem;color:#fffc;background:#081c178c;padding:4px 12px;border-radius:999px;white-space:nowrap;pointer-events:none}.band{border-top:0;padding:var(--dk-s7) 0}.dk-kicker{display:inline-block;font-size:.78rem;font-weight:700;letter-spacing:.14em;color:var(--dk-copper-text);background:var(--dk-copper-soft);padding:3px 10px;border-radius:999px;margin-bottom:var(--dk-s3)}.dk-kicker-light{color:#f2c5a0;background:#d9894f29}.dk-sec-lede{color:var(--dk-muted)}.dk-foot-small{font-size:.84rem;color:var(--dk-muted);margin-top:var(--dk-s5);max-width:90ch}.dk-calc-band{background:linear-gradient(180deg,var(--dk-patina-soft) 0,var(--dk-canvas) 260px)}.dk-calc-head h2{margin-bottom:6px}.dk-calc-head p{color:var(--dk-muted)}.dk-calc-grid{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);gap:var(--dk-s5);align-items:start}.dk-calc{background:var(--dk-paper);border:1px solid var(--dk-hair);border-radius:var(--dk-radius-lg);padding:var(--dk-s5);box-shadow:var(--dk-shadow);display:grid;gap:var(--dk-s4)}.dk-step{border:0;padding:0;margin:0;min-width:0}.dk-step+.dk-step{border-top:1px solid var(--dk-hair);padding-top:var(--dk-s4)}.dk-step legend{display:flex;align-items:center;gap:10px;font-weight:700;font-size:1.05rem;margin-bottom:var(--dk-s3);padding:0}.dk-chip{display:inline-grid;place-items:center;width:26px;height:28px;font-size:.82rem;color:var(--dk-ink);font-weight:800;background:var(--dk-copper);clip-path:polygon(30% 0,70% 0,70% 16%,100% 100%,0 100%,30% 16%);padding-top:6px}.dk-grid2{display:grid;grid-template-columns:1fr 1fr;gap:var(--dk-s3)}.dk-span2{grid-column:1 / -1}.field input,.field select{background:var(--dk-canvas);font-variant-numeric:tabular-nums}.field input:hover,.field select:hover{border-color:color-mix(in srgb,var(--dk-ink) 30%,transparent)}.field input[aria-invalid=true]{border-color:var(--dk-err);background:#fff6f5}.dk-unit{display:grid;grid-template-columns:minmax(0,1fr) 92px;gap:8px}.dk-help{font-size:.82rem;color:var(--dk-muted);margin:2px 0 0}.dk-seg{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}.dk-seg label{position:relative;cursor:pointer}.dk-seg input{position:absolute;opacity:0;inset:0;margin:0;cursor:pointer}.dk-seg span{display:flex;flex-direction:column;gap:2px;padding:12px;border:1px solid var(--dk-hair);border-radius:var(--dk-radius);font-weight:650;background:var(--dk-canvas);transition:border-color .2s,background-color .2s,color .2s;height:100%}.dk-seg small{font-weight:450;font-size:.8rem;color:var(--dk-muted)}.dk-seg input:checked+span{background:var(--dk-ink);color:#fff;border-color:var(--dk-ink)}.dk-seg input:checked+span small{color:#ffffffbf}.dk-seg input:focus-visible+span{outline:2px solid var(--dk-copper);outline-offset:2px}.dk-actions{display:flex;flex-wrap:wrap;gap:10px;align-items:center}.dk-status{font-size:.88rem;color:var(--dk-muted);margin:0;min-height:1.4em}.dk-err-box{background:#fff6f5;border:1px solid color-mix(in srgb,var(--dk-err) 35%,transparent);border-radius:var(--dk-radius);padding:12px 16px}.dk-err-box p{margin:0 0 6px;color:var(--dk-err)}.dk-err-box ul{margin:0;padding-left:1.2em;font-size:.9rem}.dk-err-box a{color:var(--dk-err)}.dk-brief{position:sticky;top:84px;min-width:0}.dk-brief-card{position:relative;background:var(--dk-paper);border-radius:var(--dk-radius-lg);border:1px solid var(--dk-hair);border-top:4px solid var(--dk-ink);box-shadow:var(--dk-shadow);padding:var(--dk-s5);min-height:420px;overflow:hidden}.br-empty{text-align:center;padding:var(--dk-s4) 0}.br-empty img,.br-empty .dxb-av3d{margin:0 auto var(--dk-s3)}.br-title{font-weight:700;font-size:1.15rem;margin:0 auto 6px}.br-empty p{margin-inline:auto;color:var(--dk-muted);font-size:.94rem}.br-where-m{display:none}.br-promise{list-style:none;padding:0;margin:var(--dk-s4) auto 0;display:grid;gap:8px;text-align:left;max-width:300px}.br-promise li{padding-left:26px;position:relative;font-size:.92rem}.br-promise li:before{content:"";position:absolute;left:4px;top:.55em;width:12px;height:2px;background:var(--dk-copper);box-shadow:0 5px 0 var(--dk-patina)}.br-verdict{border-radius:var(--dk-radius);padding:14px 16px;margin-bottom:var(--dk-s4)}.br-verdict.is-ok{background:var(--dk-ok-soft)}.br-verdict.is-over{background:var(--dk-warn-soft)}.br-badge{display:inline-flex;align-items:center;gap:8px;font-weight:750;font-size:1.2rem;margin:0 0 4px}.is-ok .br-badge{color:var(--dk-ok)}.is-over .br-badge{color:var(--dk-warn)}.br-badge:before{content:"";width:10px;height:10px;border-radius:50%;background:currentColor}.br-why{margin:4px 0 0;font-size:.94rem}.br-warn{color:var(--dk-warn);font-weight:600}.br-gauge{margin-bottom:var(--dk-s4)}.br-gauge-h{display:flex;justify-content:space-between;align-items:baseline;margin:0 0 6px;font-size:.88rem;color:var(--dk-muted);max-width:none}.br-gauge-h b{font-size:1.5rem;color:var(--dk-ink);letter-spacing:-.02em}.br-bar{position:relative;display:flex;height:16px;border-radius:999px;background:var(--dk-soft);margin-bottom:22px}.br-bar span:first-child{border-radius:999px 0 0 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