:root{--green:#092d25;--deep:#061d19;--gold:#e8c788;--ink:#17362e;--muted:#5d6a65;--paper:#f7f8f4;--line:#dce3dc}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:110px}body{margin:0;background:var(--paper);color:var(--ink);font:1rem/1.8 -apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif}a{color:inherit;text-decoration:none}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid #b77e28;outline-offset:5px}a:hover{color:#9a691f}img{max-width:100%;display:block}h1,h2,h3,p{margin-top:0}h1,h2,h3{line-height:1.4}h2{font-size:1.875rem;font-weight:650}h3{font-size:1.3125rem}p{margin-bottom:18px}.wrap{width:min(1180px,calc(100% - 64px));margin:auto}header{background:var(--deep);color:#fff;position:sticky;top:0;z-index:20;border-bottom:1px solid #ffffff20}.nav{min-height:94px;display:flex;align-items:center;justify-content:space-between;gap:30px}.brand{display:flex;align-items:center;gap:12px;font-weight:650;font-size:1.375rem;letter-spacing:1px}.brand small{display:block;font-size:0.625rem;letter-spacing:2px;color:var(--gold);line-height:1.4}.mark{font-size:2.5rem;color:var(--gold)}nav{display:flex;gap:30px;align-items:center;font-size:0.9375rem}nav a{padding:12px 0;white-space:nowrap}nav a[aria-current]{color:var(--gold);border-bottom:2px solid var(--gold)}.navvisit{border:1px solid #e8c78866;padding:9px 18px;color:var(--gold)}.menu{display:none}.hero{position:relative;isolation:isolate;min-height:590px;color:white;background:var(--deep);display:flex;align-items:center}.hero>img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:center 60%;z-index:-2}.hero:after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(3,22,17,.95),rgba(3,22,17,.6) 48%,rgba(3,22,17,.14)),linear-gradient(0deg,rgba(3,22,17,.8),transparent 45%);z-index:-1}.herotext{padding-top:50px;padding-bottom:120px}.eyebrow{font-size:0.75rem;letter-spacing:2px;font-weight:600;color:#886527;margin-bottom:20px}.hero .eyebrow{color:var(--gold)}.hero h1{font-size:clamp(42px,5.3vw,68px);line-height:1.25;letter-spacing:2px;margin-bottom:24px;font-family:"Songti SC","STSong",serif}.hero p:not(.eyebrow){font-size:1.0625rem;color:#e0e7e0;max-width:650px}.button{display:inline-flex;justify-content:space-between;gap:40px;align-items:center;background:var(--gold);color:var(--deep);padding:14px 26px;font-weight:650;border-radius:3px}.button:hover{background:#f5dca9;color:var(--deep)}.hero .textlink{margin-left:26px;color:#f2ddba}.herofoot{position:absolute;bottom:0;left:0;right:0;border-top:1px solid #ffffff35;display:flex;gap:48px;padding-top:18px;padding-bottom:18px;font-size:0.875rem;color:#e8d9bc}.curriculum,.faq{padding-top:74px;padding-bottom:78px}.sectionhead{display:flex;justify-content:space-between;gap:20px;align-items:end;margin-bottom:30px}.sectionhead h2{margin-bottom:0}.sectionhead p{color:var(--muted);font-size:0.875rem;margin-bottom:5px}.sectionhead .eyebrow{color:#886527;margin-bottom:10px}.lesson-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}.lesson{border:1px solid var(--line);background:#fff;padding:24px;display:flex;flex-direction:column;transition:transform .2s,border-color .2s}.lesson:hover{transform:translateY(-4px);border-color:#b39456;color:var(--ink)}.lessonnum{display:flex;justify-content:space-between;font:36px/1.5 Georgia,serif;color:#8a6b35;margin-bottom:28px}.lessonnum span{font:22px sans-serif}.lesson small{font-size:0.8125rem;color:var(--muted)}.lesson h3{margin:8px 0 12px;font-size:1.25rem}.lesson p{color:var(--muted);font-size:0.9375rem}.read{font-size:0.875rem;font-weight:600;margin-top:auto;padding-top:14px}.quick{background:var(--green);color:white;padding:64px 0}.quickgrid{display:grid;grid-template-columns:1fr 1fr;gap:70px;align-items:center}.quick .eyebrow,.quick .textlink{color:var(--gold)}.quick p{color:#c4d6ca}.quick h2{font-family:"Songti SC",serif;font-size:2.125rem}.example{border:1px solid #e8c78855;background:#ffffff05;padding:30px;border-radius:4px}.label{font-size:0.8125rem;color:#d1bea0}.cards{display:flex;gap:8px;flex-wrap:wrap;margin:16px 0 22px}.card{display:flex;justify-content:center;align-items:center;background:#fffdf6;color:#17271e;border:1px solid #ddd6c6;border-radius:5px;width:58px;height:78px;font:23px Georgia,serif;box-shadow:0 3px 7px #00000015}.card.red{color:#b93832}.example h3{font-size:1.1875rem;margin-bottom:10px}.example p{font-size:0.9375rem;margin-bottom:0}.faq{max-width:940px}.faq details{border-bottom:1px solid var(--line);padding:20px 0}.faq summary{font-size:1.125rem;font-weight:600;cursor:pointer;list-style:none;display:flex;justify-content:space-between;gap:20px}.faq summary:after{content:"+";color:#886527}.faq details[open] summary:after{content:"−"}.faq details p{margin:16px 0 4px;color:var(--muted)}footer{background:var(--deep);color:#cbd7d0;padding:44px 0 20px}.foot{display:flex;justify-content:space-between;gap:40px}.foot p{font-size:0.875rem;margin:12px 0}.foot small{font-size:0.75rem;color:#aabeb2}.foot>div:last-child{display:grid;grid-template-columns:repeat(2,1fr);gap:10px 30px;font-size:0.875rem}.copyright{font-size:0.75rem;color:#aabeb2;border-top:1px solid #ffffff1a;margin-top:30px;padding-top:20px}.support{position:fixed;bottom:26px;right:26px;background:var(--gold);color:var(--deep);padding:12px 20px;border-radius:4px;box-shadow:0 4px 20px #0002;z-index:25;font-size:0.875rem}.mobilebar,.onlymobile{display:none}.skip{position:fixed;left:10px;top:-100px;z-index:100;background:white;padding:10px}.skip:focus{top:10px}.articlehero{padding:38px 0 46px;background:var(--green);color:white}.crumb{font-size:0.875rem;color:#b3c5b8;margin-bottom:30px}.articlehero .eyebrow{color:var(--gold);margin-bottom:12px}.articlehero h1{font-size:2.375rem;max-width:850px;margin-bottom:14px}.articlehero p:last-child{color:#ccdacf;max-width:850px;margin-bottom:0}.articlelayout{display:grid;grid-template-columns:240px minmax(0,1fr);gap:65px;padding-top:55px;padding-bottom:70px}.articlelayout aside{align-self:start;position:sticky;top:128px;border-left:2px solid var(--gold);padding-left:20px}.articlelayout aside strong{display:block;margin-bottom:18px}.articlelayout aside a{display:block;font-size:0.875rem;line-height:1.6;margin:15px 0;color:var(--muted)}article{min-width:0;max-width:800px}article section{margin-bottom:42px}article h2{font-size:1.625rem;border-bottom:1px solid var(--line);padding-bottom:16px;margin-bottom:22px}article p,article li{line-height:1.95}article ul,article ol{padding-left:24px}article li{margin-bottom:12px}.note{background:#eee9dc;border-left:3px solid #ae8e4a;padding:18px 22px;margin:24px 0;font-size:0.9375rem}.steps li{padding-left:8px}.steps p{margin-top:7px}dt{font-weight:650;margin:18px 0 4px}dd{margin:0;color:var(--muted)}.source{font-size:0.8125rem;color:var(--muted)}.source a{text-decoration:underline}.next{border-top:1px solid var(--line);padding-top:24px;font-size:0.875rem;display:flex;flex-wrap:wrap;gap:18px}.rank{display:flex;gap:25px;padding:24px 0;border-bottom:1px solid var(--line)}.rankno{font:26px Georgia,serif;color:#92713b;width:35px;flex-shrink:0}.rank h3{margin:0}.rank p{margin:0;font-size:0.9375rem;color:var(--muted)}.rank .cards{margin:12px 0}.error{padding-top:100px;padding-bottom:130px}.error h1{font-size:2.375rem}@media(min-width:1500px){.hero{min-height:650px}}@media(max-width:1000px){nav{gap:18px}.brand{font-size:1.25rem}.lesson-grid{grid-template-columns:repeat(2,1fr)}.lessonnum{margin-bottom:15px}.quickgrid{gap:35px}.articlelayout{gap:35px;grid-template-columns:200px minmax(0,1fr)}}@media(max-width:760px){.wrap{width:calc(100% - 36px)}.nav{min-height:76px;gap:14px}.brand{font-size:1.1875rem}.brand small{font-size:0.625rem}.mark{font-size:2.0rem}.menu{display:block;border:1px solid #ffffff45;background:none;color:#fff;font:inherit;font-size:.875rem;padding:10px 12px;min-height:44px}nav{display:none;position:absolute;top:76px;left:0;right:0;background:var(--deep);padding:15px 24px 24px;flex-direction:column;align-items:stretch;gap:0;box-shadow:0 12px 20px #0003}nav.open{display:flex}nav a{padding:12px 0}.navvisit{padding:10px 14px;margin-top:8px}.hero{min-height:575px;align-items:start}.hero>img{object-position:61% center}.hero:after{background:linear-gradient(90deg,#031611eb,#03161155),linear-gradient(0deg,#031611cc,transparent 50%)}.herotext{padding-top:62px;padding-bottom:110px}.hero h1{font-size:2.75rem}.hero p:not(.eyebrow){font-size:0.9375rem;max-width:330px}.hero .eyebrow{font-size:0.6875rem}.onlymobile{display:block}.hero .textlink{display:block;margin:20px 0 0;font-size:0.875rem}.herofoot{gap:0;justify-content:space-between;font-size:0.75rem;padding:16px 0}.button{padding:12px 23px}.curriculum,.faq{padding-top:44px;padding-bottom:46px}.sectionhead{display:block;margin-bottom:23px}h2,.sectionhead h2{font-size:1.625rem}.sectionhead>p{margin-top:14px}.lesson-grid{gap:12px}.lesson{padding:18px 15px}.lesson h3{font-size:1.125rem}.lesson p{font-size:0.875rem}.lesson small{font-size:0.75rem}.lessonnum{font-size:1.875rem}.quick{padding:40px 0}.quickgrid{grid-template-columns:1fr;gap:22px}.quick h2{font-size:1.8125rem}.example{padding:23px 20px}.card{width:48px;height:66px;font-size:1.3125rem}.cards{gap:6px}.faq summary{font-size:1.0rem}.foot{flex-direction:column;gap:25px}.foot>div:last-child{grid-template-columns:repeat(2,1fr)}footer{padding-bottom:100px}.support{display:none}.mobilebar{display:grid;grid-template-columns:repeat(3,1fr);position:fixed;bottom:0;left:0;right:0;z-index:30;background:var(--deep);border-top:1px solid #ffffff33;padding:8px 10px calc(8px + env(safe-area-inset-bottom));gap:8px;box-shadow:0 -4px 20px #0001}.mobilebar a{text-align:center;padding:10px 3px;color:white;font-size:0.875rem;border-radius:3px}.mobilebar a:last-child{background:var(--gold);color:var(--deep)}.articlehero{padding:25px 0 32px}.crumb{margin-bottom:20px}.articlehero h1{font-size:1.8125rem}.articlehero p:last-child{font-size:0.9375rem}.articlelayout{display:block;padding-top:28px}.articlelayout aside{position:static;background:#eef1eb;border-left:2px solid var(--gold);padding:15px 18px;margin-bottom:32px}.articlelayout aside strong{margin-bottom:10px}.articlelayout aside a{margin:9px 0}.articlelayout aside a:last-child{margin-bottom:0}article h2{font-size:1.4375rem}.rank{gap:12px}.rankno{width:28px;font-size:1.375rem}.rank .card{width:42px;height:59px;font-size:1.125rem}.rank .cards{gap:5px}.error h1{font-size:1.75rem}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.lesson{transition:none}}

/* User-provided brand identity */
.brand-logo{display:block;width:76px;height:76px;object-fit:contain;flex-shrink:0;border-radius:50%}
.foot .brand-logo{width:72px;height:72px}
@media(max-width:1000px) and (min-width:761px){.nav{gap:16px}.nav .brand{gap:8px}.nav .brand-logo{width:58px;height:58px}nav{gap:15px}}
@media(max-width:760px){.nav .brand{gap:9px}.nav .brand-logo{width:58px;height:58px}.foot .brand-logo{width:64px;height:64px}}

/* Floating customer service button */
@keyframes support-breathe{
  0%,100%{box-shadow:0 4px 14px #880c2340,0 0 0 0 #ed304e55;transform:scale(1)}
  50%{box-shadow:0 5px 18px #880c2350,0 0 0 10px #ed304e00;transform:scale(1.045)}
}
@media(max-width:760px){
 .mobilebar{grid-template-columns:repeat(2,minmax(0,1fr))}
 .mobilebar a:last-child{display:none}
 .support{display:flex;align-items:center;justify-content:center;position:fixed;right:16px;bottom:calc(96px + env(safe-area-inset-bottom));width:64px;height:64px;padding:10px;border-radius:50%;background:#c91836;color:#fff;font-size:.875rem;font-weight:650;line-height:1.45;text-align:center;z-index:35;animation:support-breathe 2.4s ease-in-out infinite;box-shadow:0 4px 14px #880c2340}
 .support:hover,.support:focus-visible{background:#ac102b;color:#fff}
 .support-label{max-width:2em}
}
@media(prefers-reduced-motion:reduce){.support{animation:none}}