:root{color-scheme:light;--ink:#26312e;--muted:#596661;--red:#b62e45;--red-soft:#fff0f2;--green:#18765c;--green-soft:#eef7f2;--yellow:#895900;--yellow-soft:#fff7df;--line:#e2e8e4;--paper:#f7f8fa;--white:#fff}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:96px}body{margin:0;background:var(--paper);color:var(--ink);font:17px/1.75 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;overflow-wrap:anywhere}a{color:var(--green);text-underline-offset:4px}a:hover{color:var(--red)}a:focus-visible{outline:3px solid var(--yellow);outline-offset:5px;border-radius:4px}img{max-width:100%;height:auto}h1,h2,h3,p{margin-top:0}h1{font-size:clamp(34px,5.2vw,60px);line-height:1.22;letter-spacing:-1.5px;margin-bottom:24px}h2{font-size:clamp(25px,3vw,34px);line-height:1.35;letter-spacing:-.5px}h3{font-size:20px;line-height:1.45;margin-bottom:12px}p{margin-bottom:18px}.wrap{width:min(1100px,calc(100% - 48px));margin:auto}.skip{position:absolute;left:20px;top:-80px;background:white;padding:12px;z-index:20}.skip:focus{top:10px}.site-header{position:sticky;top:0;z-index:10;background:rgba(255,255,255,.97);border-bottom:1px solid var(--line)}.nav{display:flex;align-items:center;justify-content:space-between;gap:24px;min-height:80px}.brand{display:inline-flex;align-items:center;gap:12px;font-size:21px;font-weight:700;text-decoration:none;color:var(--ink)}.brand img{width:42px;height:42px;border-radius:11px}.nav-links{display:flex;gap:20px;flex-wrap:wrap}.nav-links a{display:inline-flex;align-items:center;min-height:44px;text-decoration:none;font-size:14px}.hero{padding:78px 0 64px;display:grid;grid-template-columns:1.1fr .9fr;gap:60px;align-items:center}.eyebrow{color:var(--red);font-weight:700;font-size:13px;letter-spacing:2px;margin-bottom:20px}.lead{font-size:19px;color:var(--muted);max-width:650px}.actions{display:flex;gap:12px;flex-wrap:wrap;margin:26px 0}.button{display:inline-flex;justify-content:center;align-items:center;min-height:48px;padding:10px 20px;border-radius:14px;font-weight:600;text-decoration:none;border:1px solid var(--line);background:var(--white)}.button.primary{background:var(--red);color:white;border-color:var(--red)}.button:hover{box-shadow:0 4px 14px #26312e12}.status,.pill{display:inline-block;padding:5px 12px;border-radius:40px;background:var(--green-soft);color:var(--green);font-size:13px;font-weight:600}.status{background:var(--yellow-soft);color:var(--yellow)}.visual{position:relative;padding:28px;border-radius:32px;background:linear-gradient(150deg,var(--red-soft),#fff 54%,var(--green-soft));border:1px solid #efdfe1;box-shadow:0 18px 60px #9a33480d}.visual-heading{display:flex;align-items:center;gap:14px;margin-bottom:28px}.visual-heading img{width:64px;height:64px;border-radius:16px}.visual-heading strong{font-size:22px}.visual-heading p{font-size:13px;color:var(--muted);margin:0}.two-metrics{display:grid;grid-template-columns:1fr 1fr;gap:14px}.metric{padding:20px 16px;border:1px solid var(--line);border-radius:20px;background:white}.metric.heart{color:var(--red)}.metric.breath{color:var(--green)}.metric .symbol{display:block;font-size:29px;margin-bottom:12px}.metric strong{font-size:17px}.metric p{font-size:12px;margin:8px 0 0;color:var(--muted)}.visual-caption{margin:24px 0 0;color:var(--muted);font-size:13px}.section{padding:54px 0;border-top:1px solid var(--line)}.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.card{background:white;border:1px solid var(--line);border-radius:22px;padding:26px}.card p:last-child{margin:0}.step{font-weight:700;font-size:13px;letter-spacing:1px;color:var(--green);margin-bottom:14px}.muted{color:var(--muted)}.notice{background:var(--yellow-soft);border:1px solid #ecd79e;border-radius:18px;padding:22px 24px;color:#674c16}.notice strong{display:block;margin-bottom:6px}.notice p:last-child{margin-bottom:0}.paper{border-inline-start:4px solid var(--green);background:var(--white);border-radius:0 20px 20px 0;padding:28px;margin:26px 0}.paper-title{font-size:21px;line-height:1.45;color:var(--ink)}.paper .citation{font-size:14px;color:var(--muted)}.reading{max-width:820px}.reading-hero{padding:64px 0 40px}.reading-hero h1{font-size:clamp(32px,4.8vw,50px)}.flow{list-style:none;padding:0;counter-reset:steps;display:grid;gap:16px}.flow li{position:relative;padding:20px 24px 20px 62px;border:1px solid var(--line);background:white;border-radius:18px;counter-increment:steps}.flow li:before{content:counter(steps);position:absolute;left:22px;top:20px;color:var(--red);font-weight:700}.comparison{width:100%;border-collapse:collapse;font-size:15px}.comparison th,.comparison td{padding:14px 12px;text-align:start;border-bottom:1px solid var(--line);vertical-align:top}.comparison th{background:var(--green-soft);color:var(--green)}.table-scroll{overflow:auto}.english{font-size:16px;color:var(--muted)}.footer{border-top:1px solid var(--line);padding:32px 0;color:var(--muted);font-size:13px}.footer .wrap{display:flex;justify-content:space-between;gap:22px;flex-wrap:wrap}.footer-links{display:flex;gap:18px;flex-wrap:wrap}.footer a{display:inline-flex;align-items:center;min-height:32px}.small{font-size:14px}.nowrap{white-space:nowrap}
@media(max-width:760px){.wrap{width:calc(100% - 36px)}.nav{min-height:76px;gap:12px;align-items:center}.brand{font-size:18px;gap:8px}.brand img{width:34px;height:34px}.nav-links{gap:12px}.nav-links a{font-size:13px}.hero{padding:40px 0;grid-template-columns:1fr;gap:32px}.visual{padding:22px}.grid{grid-template-columns:1fr}.section{padding:36px 0}.reading-hero{padding-top:38px}.paper{padding:22px}.comparison{min-width:540px}.notice{padding:20px}.lead{font-size:17px}.card{padding:22px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}