:root{color-scheme:light;--bg:#f8fafc;--surface:#fff;--soft:#eef3fb;--text:#172033;--muted:#536176;--line:#dce3ee;--accent:#2456c4;--accent-hover:#1943a1;--result:#edf3ff;--error:#b42318;--shadow:0 8px 30px rgba(35,56,94,.035);--radius:18px;--input-radius:10px}
:root[data-theme=dark]{color-scheme:dark;--bg:#101827;--surface:#192438;--soft:#202e46;--text:#f3f6fc;--muted:#b1bed1;--line:#35435a;--accent:#a6c2ff;--accent-hover:#c4d6ff;--result:#202f4b;--error:#ffb4ab;--shadow:none}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:80px}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Malgun Gothic","Apple SD Gothic Neo",sans-serif;line-height:1.65;letter-spacing:-.025em}button,input,select,textarea{font:inherit}button,a,input,select,summary{touch-action:manipulation}a{color:var(--accent);text-underline-offset:4px}button{cursor:pointer}button:disabled{cursor:not-allowed}button,a{ -webkit-tap-highlight-color:transparent}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible,textarea:focus-visible{outline:3px solid var(--accent);outline-offset:3px}h1,h2,h3,p{margin:0}h1,h2,h3{word-break:keep-all;overflow-wrap:anywhere}p{word-break:keep-all;overflow-wrap:anywhere}h2{font-size:28px;line-height:1.4;letter-spacing:-.055em}h3{font-size:17px;line-height:1.5}.shell{width:calc(100% - 40px);max-width:1120px;margin-inline:auto}[hidden]{display:none!important}.header{background:var(--surface);border-bottom:1px solid var(--line)}.header-inner{height:76px;display:flex;align-items:center;justify-content:space-between;gap:12px}.brand{display:flex;align-items:center;gap:9px;color:var(--text);text-decoration:none;font-size:20px;font-weight:800;letter-spacing:-.055em;white-space:nowrap}.brand-mark{background:var(--accent);color:var(--surface);border-radius:9px;display:grid;place-items:center;width:32px;height:32px;font-size:26px;line-height:1}.header-tools{display:flex;align-items:center;gap:22px}.lab-link{font-size:13px;text-decoration:none;color:var(--muted)}.theme-toggle{min-height:44px;padding:6px 12px;border:1px solid var(--line);border-radius:var(--input-radius);background:var(--surface);font-size:12px;color:var(--text)}.hero{display:grid;grid-template-columns:1.3fr 1fr;column-gap:80px;padding-block:56px 30px}.eyebrow{font-size:13px;font-weight:700;color:var(--accent);margin-bottom:15px}.hero h1{font-size:clamp(30px,4.1vw,48px);line-height:1.27;letter-spacing:-.07em}.hero-description{color:var(--muted);font-size:17px;margin-top:20px;line-height:1.75}.hero-actions{display:flex;gap:10px;margin-top:25px}.primary,.secondary{border:1px solid var(--accent);border-radius:var(--input-radius);min-height:48px;display:inline-flex;align-items:center;justify-content:center;gap:18px;padding:12px 18px;font-size:15px;font-weight:700;text-decoration:none;white-space:nowrap}.primary{background:var(--accent);color:var(--surface)}.primary:hover{background:var(--accent-hover);border-color:var(--accent-hover)}.secondary{background:var(--surface);color:var(--accent);border-color:var(--line)}.secondary:hover{border-color:var(--accent)}button:active,.primary:active,.secondary:active{transform:translateY(1px)}.hero-side{display:flex;align-items:center;justify-content:flex-end}.plan-sheet{width:100%;max-width:355px;background:var(--surface);border:1px solid var(--line);border-top:3px solid var(--accent);border-radius:var(--radius);padding:25px 28px;box-shadow:var(--shadow)}.sheet-title{font-size:16px;font-weight:750;margin-bottom:13px}.sheet-row{padding-block:14px;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;gap:12px;font-size:13px}.sheet-row span:first-child{font-weight:650}.sheet-row span:last-child{color:var(--muted)}.sheet-footer{font-size:12px;color:var(--muted);margin-top:20px}.hero-disclaimer{grid-column:1/-1;color:var(--muted);font-size:12px;margin-top:29px}.quick-nav{position:sticky;top:0;z-index:10;background:var(--surface);border-block:1px solid var(--line)}.nav-inner{display:flex;gap:8px;overflow-x:auto;scrollbar-width:none;padding-block:8px}.nav-inner::-webkit-scrollbar{display:none}.nav-inner a{flex-shrink:0;text-decoration:none;font-size:14px;color:var(--muted);font-weight:650;padding:11px 20px;min-height:44px;border-radius:8px}.nav-inner a[aria-current]{background:var(--soft);color:var(--accent)}.content{padding-top:20px}.privacy-controls{display:flex;align-items:center;gap:10px 25px;flex-wrap:wrap;font-size:12px;padding-bottom:5px}.privacy-controls .hint{flex-basis:100%;margin-top:-7px}.check-line{display:flex;align-items:flex-start;gap:10px;font-size:13px;cursor:pointer;min-height:44px;padding-block:10px}.check-line input,.check-item input{width:18px;height:18px;flex:0 0 18px;accent-color:var(--accent);margin:3px 0}.text-button{border:0;color:var(--muted);background:transparent;min-height:44px;padding:8px 3px;font-size:13px;text-decoration:underline;text-underline-offset:4px}.calculator-section{padding-block:40px 20px}.section-heading{margin-bottom:20px}.section-heading p{color:var(--muted);font-size:14px;margin-top:8px}.section-tag{display:block;color:var(--accent);font-size:12px;font-weight:750;margin-bottom:8px}.calculator{display:grid;grid-template-columns:minmax(0,1.18fr) minmax(0,1fr);background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}form{padding:28px;min-width:0}.field-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:0 16px}.field{margin-bottom:19px;min-width:0}.field label{display:block;font-size:13px;font-weight:700;margin-bottom:8px}.field input,.field select{width:100%;min-width:0;max-width:100%;height:50px;border:1px solid var(--line);background:var(--surface);border-radius:var(--input-radius);padding:10px 13px;color:var(--text);font-size:16px;letter-spacing:0}.field input::placeholder{color:var(--muted);opacity:.85}.field select{padding-right:24px;font-size:14px}.field input[type=date]{appearance:none;-webkit-appearance:none;display:block;text-align:left}.field input[type=date]::-webkit-date-and-time-value{text-align:left}.hint{font-size:12px;color:var(--muted);line-height:1.7;margin-top:6px}.hint:empty{display:none}.error{font-size:12px;color:var(--error);margin-top:6px}.field [aria-invalid=true]{border-color:var(--error)}.switcher{display:grid;grid-template-columns:1fr 1fr;background:var(--soft);padding:4px;border-radius:var(--input-radius);margin-bottom:22px;gap:4px}.switcher button{border:0;background:transparent;color:var(--muted);min-height:44px;font-size:13px;border-radius:7px;padding:8px 4px;font-weight:650}.switcher button[aria-pressed=true]{background:var(--surface);color:var(--accent);box-shadow:0 2px 7px rgba(35,56,94,.06)}.notice{padding:13px 15px;font-size:12px;line-height:1.8;background:var(--soft);border-radius:var(--input-radius);margin-bottom:20px}.form-actions{display:flex;gap:18px;align-items:center;margin-top:23px}.form-actions .primary{flex:1}.form-message{font-size:13px;color:var(--error);margin-top:10px}.form-message:empty{display:none}.result-panel{background:var(--soft);border-left:1px solid var(--line);padding:30px;display:flex;align-items:center;justify-content:center;min-width:0}.empty{text-align:center;color:var(--muted);padding:30px 0}.empty-mark{margin-inline:auto;display:grid;place-items:center;width:56px;height:56px;background:var(--surface);border:1px solid var(--line);color:var(--accent);border-radius:16px;font-size:32px;margin-bottom:20px}.empty h3{color:var(--text);font-size:17px}.empty p{font-size:13px;margin-top:9px}.small-label{display:block;font-size:11px;margin-top:22px}.result{width:100%;min-width:0}.result-label{font-size:12px;color:var(--muted);margin-bottom:8px}.result h3{font-size:16px}.result-number{font-variant-numeric:tabular-nums;letter-spacing:-.06em;font-size:clamp(28px,3vw,38px);line-height:1.4;font-weight:800;color:var(--accent);margin-block:10px 22px;overflow-wrap:anywhere;word-break:normal}.result dl{margin:0}.detail-row{display:flex;justify-content:space-between;gap:15px;padding-block:10px;border-bottom:1px solid var(--line);font-size:12px}.detail-row dt{color:var(--muted);min-width:0}.detail-row dd{margin:0;text-align:right;max-width:65%;word-break:keep-all;overflow-wrap:anywhere;font-weight:650;font-variant-numeric:tabular-nums}.result-note{font-size:12px;color:var(--muted);line-height:1.85;margin-block:17px}.result .secondary{width:100%}.copy-feedback{color:var(--accent);font-size:12px;margin-top:10px;min-height:20px}.period-preview{background:var(--soft);padding:13px 15px;border-radius:var(--input-radius);font-size:12px;color:var(--muted);line-height:1.8;margin-bottom:8px}.advanced{border-bottom:1px solid var(--line);margin-top:12px}.advanced summary{padding-block:14px;cursor:pointer;font-size:13px;color:var(--muted)}.advanced .field:first-of-type{margin-top:12px}.checklist-section{margin-top:50px;padding-bottom:35px}.checklist-summary{display:flex;align-items:center;gap:20px;flex-wrap:wrap;border-bottom:1px solid var(--line);padding-bottom:13px;margin-bottom:24px;font-size:13px}.checklist-summary strong{color:var(--accent);white-space:nowrap}progress{width:180px;height:5px;accent-color:var(--accent);border:0;border-radius:5px;background:var(--line)}progress::-webkit-progress-bar{background:var(--line);border-radius:5px}progress::-webkit-progress-value{background:var(--accent);border-radius:5px}progress::-moz-progress-bar{background:var(--accent);border-radius:5px}.checklist-grid{display:grid;grid-template-columns:1fr 1fr;gap:35px}.check-group h3{margin-bottom:12px}.check-item{display:flex;align-items:center;gap:12px;padding:12px 15px;margin-bottom:7px;min-height:48px;background:var(--surface);border:1px solid var(--line);border-radius:var(--input-radius);font-size:13px;cursor:pointer}.check-item:has(input:checked){background:var(--soft)}.check-item input:checked+span{text-decoration:line-through;color:var(--muted)}.basis-section{border-block:1px solid var(--line);padding-block:35px;margin-top:15px}.basis-section h2,.faq-section h2{font-size:23px;margin-bottom:22px}.basis-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}.basis-grid h3{font-size:14px;margin-bottom:8px}.basis-grid p{font-size:12px;color:var(--muted);line-height:1.9}.basis-grid a{font-size:12px;display:block;margin-top:12px}.basis-date{font-size:11px;color:var(--muted);margin-top:27px}.faq-section{padding-block:42px 25px}.faq-section details{border-bottom:1px solid var(--line)}.faq-section summary{padding:18px 25px 18px 0;cursor:pointer;font-size:14px;font-weight:650}.faq-section details p{color:var(--muted);font-size:13px;padding:0 0 20px;max-width:850px;line-height:1.9}.legal{padding:22px;background:var(--soft);border-radius:var(--input-radius);margin-block:20px 30px;font-size:12px;color:var(--muted);line-height:1.9}.legal strong{color:var(--text);display:block;margin-bottom:6px}.footer{padding-block:24px 40px;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}.footer .brand{font-size:16px}.footer p,.footer>a:last-child{font-size:12px;color:var(--muted)}.skip-link{position:fixed;left:16px;top:-100px;background:var(--surface);padding:12px;z-index:30}.skip-link:focus{top:12px}dialog{width:calc(100% - 32px);max-width:480px;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);color:var(--text);padding:24px}dialog::backdrop{background:rgba(15,23,42,.5)}dialog h2{font-size:21px}dialog p{font-size:13px;color:var(--muted);margin-block:12px}dialog textarea{width:100%;height:240px;border:1px solid var(--line);border-radius:var(--input-radius);padding:12px;background:var(--bg);color:var(--text);font-size:14px;resize:vertical;margin-bottom:15px}
@media(min-width:768px){#dday .calculator{grid-template-columns:1fr 1.2fr}#dday .result-number{font-size:60px}#dday .result-panel{min-height:350px}}
@media(max-width:767px){.shell{width:calc(100% - 32px)}.header-inner{height:64px}.header-tools{gap:8px}.lab-link{font-size:11px}.hero{grid-template-columns:1fr;padding-block:35px 22px;gap:0}.hero h1{font-size:35px}.hero-description{font-size:15px;margin-top:16px}.hero-actions{margin-top:20px}.hero-side{display:none}.hero-disclaimer{margin-top:20px}.nav-inner{width:100%;padding-inline:16px;gap:3px}.nav-inner a{padding-inline:14px;font-size:13px}.calculator{grid-template-columns:1fr}form{padding:22px}.result-panel{border-left:0;border-top:1px solid var(--line);padding:24px}.empty{padding:5px 0}.empty-mark{display:none}.empty h3{font-size:14px}.empty p{font-size:12px}.empty p br{display:none}.small-label{margin-top:8px}.section-heading h2{font-size:25px}.calculator-section{padding-top:31px}.checklist-grid{gap:24px;grid-template-columns:1fr}.basis-grid{grid-template-columns:1fr;gap:24px}.checklist-summary{gap:12px}progress{flex:1;min-width:70px}.footer{align-items:flex-start;flex-direction:column}.privacy-controls{gap:0 17px}.result-number{font-size:36px}.result h3{font-size:17px}.checklist-section{margin-top:37px}}
@media(max-width:450px){.header .brand{font-size:17px;gap:7px}.brand-mark{width:28px;height:28px;font-size:23px}.lab-link{display:none}.theme-toggle{font-size:11px;padding-inline:10px}.hero{padding-top:29px}.hero h1{font-size:clamp(29px,8vw,35px);letter-spacing:-.075em}.eyebrow{font-size:12px;margin-bottom:12px}.hero-description{font-size:14px;line-height:1.8}.hero-actions{display:grid;grid-template-columns:1.15fr 1fr;gap:8px}.hero-actions a{padding:12px 8px;font-size:13px;gap:10px}.hero-disclaimer{font-size:11px;line-height:1.8}.nav-inner{padding-inline:12px;gap:0}.nav-inner a{padding-inline:11px;font-size:12px}.content{padding-top:13px}.privacy-controls{font-size:11px;justify-content:space-between;gap:0}.privacy-controls .check-line,.privacy-controls .text-button{font-size:11px}.privacy-controls .check-line{gap:7px}.privacy-controls .hint{font-size:10px;line-height:1.7}.section-heading{margin-bottom:16px}.section-heading h2{font-size:23px}.section-heading p{font-size:12px;line-height:1.8}.section-tag{font-size:11px}.calculator-section{padding-top:29px;padding-bottom:8px}form{padding:20px 16px}.field-grid{grid-template-columns:1fr;gap:0}.field{margin-bottom:18px}.field label{font-size:13px}.field input,.field select{height:52px;font-size:16px}.field select{font-size:14px}.switcher{margin-bottom:20px}.switcher button{font-size:12px}.form-actions{gap:16px}.form-actions .primary{font-size:14px;gap:12px}.result-panel{padding:22px 16px}.result-number{font-size:34px}.detail-row{font-size:12px;gap:10px}.checklist-summary{gap:10px}.checklist-summary .text-button{font-size:11px}.checklist-summary strong{font-size:12px}.check-item{font-size:13px}.faq-section summary{font-size:13px}.legal{padding:17px;font-size:11px}.basis-section h2,.faq-section h2{font-size:22px}.checklist-section h2{font-size:25px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation:none!important;transition:none!important}}