:root{--ink:#12182a;--muted:#687287;--border:#e8edf3;--bg:#f8fafc;--white:#fff;--blue:#3b62d9;--violet:#7d5cda;--soft:#eef3ff;--radius:20px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"SF Pro Display","PingFang SC","Microsoft YaHei",sans-serif;font-size:15px;line-height:1.7;-webkit-font-smoothing:antialiased}a{text-decoration:none;color:inherit}button,input,select{font:inherit}button{cursor:pointer}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #9badff;outline-offset:2px}::selection{background:#dce4ff}.container{max-width:1190px;margin:0 auto;padding:0 26px}.nav{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.88);backdrop-filter:blur(18px);border-bottom:1px solid var(--border)}.navin{display:flex;align-items:center;justify-content:space-between;min-height:68px;gap:16px}.brand{font-weight:850;font-size:16px;letter-spacing:-.5px;white-space:nowrap}.brand b{color:var(--blue)}.links{display:flex;align-items:center;gap:22px;white-space:nowrap;overflow:auto;scrollbar-width:none}.links a{font-size:13px;color:#4c596d;font-weight:600}.links a:hover{color:var(--blue)}.hero{background:radial-gradient(ellipse at 88% 18%,rgba(86,100,228,.25),transparent 38%),radial-gradient(ellipse at 17% 95%,rgba(104,162,238,.23),transparent 42%),#0d142c;color:white;padding:95px 0 78px;position:relative;overflow:hidden}.eyebrow{display:inline-flex;align-items:center;gap:8px;letter-spacing:1.4px;font-size:11px;font-weight:800;color:#a9c3ff;text-transform:uppercase}.hero h1{max-width:870px;font-size:clamp(38px,5.6vw,76px);letter-spacing:-3px;line-height:1.17;margin:24px 0}.gradient{background:linear-gradient(98deg,#b6caff 0%,#f1b8fc 60%,#9de0f6);color:transparent;background-clip:text}.hero p{max-width:730px;font-size:18px;color:#b9c3d9;margin-bottom:32px}.actions{display:flex;gap:12px;flex-wrap:wrap}.btn{display:inline-flex;align-items:center;justify-content:center;border:1px solid transparent;border-radius:999px;padding:12px 20px;font-weight:750;font-size:14px;background:var(--blue);color:white;transition:.2s}.btn:hover{transform:translateY(-2px);box-shadow:0 8px 25px rgba(46,69,157,.18)}.btn.light{background:white;color:#172448}.btn.ghost{background:transparent;border-color:#526182;color:#dde9ff}.btn.small{padding:9px 13px;font-size:12px}.hero-metrics{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:13px;max-width:650px;margin-top:60px}.hero-metrics b{font-size:27px;display:block}.hero-metrics span{font-size:12px;color:#a2b2d1}.section{padding:78px 0}.section-head{display:flex;justify-content:space-between;align-items:end;gap:18px;margin-bottom:25px}.section h2,.section-head h2{font-size:clamp(25px,3vw,37px);line-height:1.25;letter-spacing:-1.3px;margin:8px 0}.section-head p,.lede{color:var(--muted);margin:0;max-width:680px}.tag{display:inline-block;font-size:11px;font-weight:800;color:var(--blue);letter-spacing:1.5px}.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}.card{background:white;border:1px solid var(--border);border-radius:var(--radius);padding:24px;box-shadow:0 6px 30px rgba(19,36,75,.035)}.card:hover{border-color:#c6d5ff}.card h3{font-size:18px;margin:10px 0 8px;line-height:1.35;letter-spacing:-.35px}.card p{color:var(--muted);margin:0;font-size:13px}.card .meta{font-size:11px;color:#6981b6;font-weight:800}.card .foot{border-top:1px solid #eef2f6;margin-top:15px;padding-top:12px;font-size:12px;color:#4a5c88}.card .foot a,.small-link{color:var(--blue);font-weight:750}.card.selected{border-color:#7c92ed;box-shadow:0 8px 32px rgba(42,89,208,.12)}.card-button{text-align:left;width:100%;display:block}.steps{counter-reset:step}.step{display:flex;align-items:flex-start;gap:15px;margin:13px 0;color:#526076}.step .num{background:var(--soft);color:#4764ca;min-width:30px;height:30px;display:inline-flex;align-items:center;justify-content:center;border-radius:50%;font-weight:800}.callout{border:1px solid #dbe6fc;background:#f1f6ff;border-radius:18px;padding:21px 25px}.callout strong{color:#334f98}.bar{display:flex;gap:8px;margin:20px 0;flex-wrap:wrap}.chip{border:1px solid #dce4ed;background:white;color:#66728a;border-radius:999px;font-size:12px;padding:7px 13px;font-weight:750}.chip.active{background:#233c83;color:#fff;border-color:#233c83}.toolbar{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin:22px 0}.search{border:1px solid #dce4ed;background:white;border-radius:11px;padding:11px 14px;min-width:220px;flex:1;color:#22334e}.select{padding:11px;border-radius:11px;border:1px solid #dce4ed;background:white;color:#3d4f72}.count{font-size:12px;color:#8591a4}.pill{background:#edf4ff;border-radius:100px;color:#4e64a3;font-size:11px;font-weight:700;padding:4px 9px;display:inline-block}.list-card{display:flex;flex-direction:column;justify-content:space-between;min-height:180px}.list-card h3{font-size:17px}.list-card .mini{font-size:12px;margin-top:10px;color:#4f5d73}.result{font-size:12px;font-weight:700;color:#293e80;margin-top:9px}.case-card .foot{display:flex;justify-content:space-between;gap:10px}.case-card .mini{min-height:55px}.good{color:#157454}.bad{color:#af4966}.codebox{background:#10192c;border-radius:14px;color:#d9e8ff;white-space:pre-wrap;font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:12px;line-height:1.65;padding:20px;margin-top:15px;max-height:310px;overflow:auto}.plan{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:9px}.day{background:#fff;border:1px solid #e4eaf4;padding:12px;border-radius:13px;text-align:left;min-height:101px}.day strong{display:block;color:#294a98;font-size:11px}.day span{display:block;margin-top:6px;font-size:12px;font-weight:700;line-height:1.4}.day.done{border-color:#91cdb9;background:#f1fcf8}.day.done strong{color:#24816a}.progress{height:8px;border-radius:10px;background:#e8edf6;overflow:hidden;margin:12px 0}.progress .fill{height:100%;width:0%;background:linear-gradient(90deg,#345bdb,#9e70eb);transition:.2s}.calculator{display:grid;grid-template-columns:1fr 1fr;gap:22px}.calc-inputs{display:grid;grid-template-columns:1fr 1fr;gap:14px}.field{display:flex;flex-direction:column;gap:5px}.field label{color:#627189;font-size:12px;font-weight:800}.field input{border:1px solid #dfe6f0;border-radius:10px;padding:10px;width:100%;color:#172846;background:white}.calc-results{background:#121d36;color:#fff;border-radius:18px;padding:23px}.calc-results .metric{border-bottom:1px solid #32415e;padding:10px 0}.calc-results span{color:#aebbd4;font-size:12px}.calc-results b{display:block;font-size:25px;letter-spacing:-.5px}.calc-results .net b{color:#85e9c1}.calc-results .loss b{color:#ff9fa4}.warning{font-size:12px;color:#718098;margin-top:12px}.resources{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.resource{background:#fff;border:1px solid var(--border);border-radius:12px;padding:14px;display:flex;justify-content:space-between;align-items:start;gap:10px}.resource b{font-size:13px}.resource p{font-size:11px;color:#7a879d;margin:4px 0}.resource a{font-size:12px;color:var(--blue);font-weight:700;white-space:nowrap}.footer{border-top:1px solid var(--border);padding:37px 0;font-size:13px;color:#6d7b93;background:white}.detail{padding:55px 0 90px}.detail-wrap{max-width:830px;margin:0 auto}.detail h1{font-size:clamp(30px,4vw,48px);line-height:1.22;letter-spacing:-1.6px}.detail h2{margin-top:32px;font-size:21px}.detail p,.detail li{color:#46546b}.detail li{margin:9px 0}.detail .lead{font-size:18px}.detail .source{word-break:break-all;color:var(--blue)}.detail .callout{margin:20px 0}.empty{text-align:center;padding:40px;color:#8390a5}.muted{color:#8190a8}.feature-row{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.feature{border-left:3px solid #859fea;padding:0 16px}.feature b{display:block;font-size:15px}.feature p{font-size:13px;color:#738099}.copy-status{font-size:12px;color:#277b55;margin-left:8px}.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}@media(max-width:960px){.grid{grid-template-columns:repeat(2,1fr)}.plan{grid-template-columns:repeat(4,1fr)}.calculator{grid-template-columns:1fr}.section{padding:60px 0}}@media(max-width:640px){.container{padding:0 18px}.navin{flex-wrap:wrap;padding:8px 0;gap:7px}.links{width:100%;gap:18px;padding-bottom:5px}.hero{padding:70px 0 54px}.hero h1{letter-spacing:-1.7px}.hero p{font-size:15px}.hero-metrics{margin-top:42px;grid-template-columns:repeat(2,1fr);gap:21px}.grid,.grid.two,.resources,.feature-row{grid-template-columns:1fr}.plan{grid-template-columns:repeat(3,1fr)}.section-head{display:block}.calc-inputs{grid-template-columns:1fr 1fr}.card{padding:20px}.detail{padding:35px 0 70px}}@media(max-width:390px){.plan{grid-template-columns:repeat(2,1fr)}.calc-inputs{grid-template-columns:1fr}}@media(prefers-reduced-motion:reduce){*,html{scroll-behavior:auto!important;transition:none!important}}

/* Author contact: calm Apple-style conversion components, readable on mobile */
.nav-contact{color:#315fd6!important;font-weight:800!important}.hero-author{display:flex;align-items:center;gap:9px;flex-wrap:wrap;margin-top:20px;font-size:13px;color:#b9c9e3}.hero-author strong{color:#fff;letter-spacing:.3px}.hero-author a{color:#d1e1ff;border-bottom:1px solid rgba(209,225,255,.5)}.section-contact{padding-top:32px;padding-bottom:80px;scroll-margin-top:100px}.contact-panel{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(220px,.7fr);align-items:center;gap:38px;padding:40px 42px;border:1px solid #dce7fb;background:linear-gradient(135deg,#fff 0%,#f3f7ff 100%);border-radius:26px;box-shadow:0 16px 46px rgba(29,58,111,.055)}.contact-panel h2,.detail .contact-panel h2{font-size:clamp(23px,2.7vw,32px);letter-spacing:-1px;line-height:1.25;margin:12px 0 10px}.contact-panel p,.detail .contact-panel p{font-size:14px;line-height:1.75;color:#57677f;margin:10px 0}.contact-panel .tag{letter-spacing:1.15px}.wechat-display{display:flex;gap:8px;align-items:center;flex-wrap:wrap;font-size:14px!important;color:#384965!important}.wechat-display strong{font-size:17px;letter-spacing:.5px;color:#1f3d7f}.contact-buttons{display:flex;flex-direction:column;align-items:stretch;gap:12px}.contact-buttons .btn{min-height:47px;padding:12px 14px}.contact-outline{background:#fff;color:#2f54a0;border:1px solid #b7c9ea}.contact-service-link{font-size:13px;color:#3055a8;font-weight:750;text-align:center}.contact-feedback{display:inline-block;font-size:12px;color:#147859;min-height:1em}.contact-panel-detail{margin-top:44px;margin-bottom:10px;padding:28px 30px;grid-template-columns:minmax(0,1.4fr) minmax(190px,.7fr);gap:25px}.contact-panel-detail h2{font-size:24px!important}.contact-panel-detail .contact-buttons .btn{font-size:13px}.footer a{color:#315cb7;text-decoration:underline;text-underline-offset:3px}@media(max-width:760px){.contact-panel,.contact-panel-detail{grid-template-columns:1fr;gap:15px;padding:27px 23px;border-radius:20px}.contact-buttons{gap:10px}.contact-panel-detail{margin-top:35px}.hero-author{font-size:12px}.section-contact{padding-top:16px}}@media(max-width:390px){.contact-panel,.contact-panel-detail{padding:21px 17px}.contact-buttons .btn{font-size:12px}}