@import "https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;450;500;550;600;650;700&family=Manrope:wght@400;500;600;650;700;750;800&display=swap";:root{--ink:#14243c;--muted:#58677a;--blue:#255fdf;--border:#dce3ed;--surface:#f6f8fc;--white:#fff}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:30px}body{color:var(--ink);background:var(--white);-webkit-font-smoothing:antialiased;margin:0;font-family:DM Sans,Arial,PingFang SC,Microsoft Yahei,sans-serif;font-size:15px}a{color:inherit;text-decoration:none}button,input,select{font:inherit}button,summary{cursor:pointer}button,a,input,select,summary{outline-offset:5px}:is(button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible){outline:2px solid var(--blue)}button{transition:background .2s,transform .2s}button:disabled{cursor:wait;opacity:.65}.review-strip{text-align:center;color:#536078;letter-spacing:.025em;background:#edf2fa;border-bottom:1px solid #dce5f2;padding:9px 20px;font-size:11px}.header{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;max-width:1280px;margin:auto;padding:26px 52px;display:flex}.wordmark{letter-spacing:.02em;align-items:center;gap:12px;font-size:16px;font-weight:750;display:flex}.header-right{align-items:center;gap:42px;display:flex}.resource-label{letter-spacing:.15em;color:var(--muted);font-size:10px}.language{color:#8a94a3;align-items:center;gap:9px;font-size:12px;display:flex}.language button{color:#687588;background:0 0;border:none;padding:12px 3px}.language button[aria-pressed=true]{color:var(--ink);font-weight:700}.hero{grid-template-columns:1.12fr 1fr;gap:78px;max-width:1176px;margin:0 auto;padding:62px 0 55px;display:grid}.eyebrow{letter-spacing:.15em;align-items:center;gap:9px;font-size:10px;font-weight:650;display:flex}.blue-dot{background:var(--blue);border-radius:50%;width:6px;height:6px;display:inline-block}h1{letter-spacing:-3.5px;margin:23px 0;font-family:Manrope,Arial,PingFang SC,sans-serif;font-size:64px;font-weight:650;line-height:1.1}h1 span{color:var(--blue)}.intro{color:var(--muted);max-width:470px;margin:0 0 27px;font-size:15px;line-height:1.8}.publishers>span{color:var(--muted);margin-bottom:9px;font-size:10px;display:block}.publishers strong{font-size:13px;font-weight:650}.publisher-plus{color:#9aa7ba;margin:0 10px;font-weight:400;display:inline-block}.book-area{background:radial-gradient(at 40% 85%,#e6efff 0%,#f2f6fd 45%,#fff 76%);border-radius:2px;height:285px;margin-top:28px;position:relative;overflow:hidden}.book{border-left:4px solid #b5cfff;border-right:2px solid #d5e3fd;width:172px;position:absolute;top:9px;left:45px;transform:perspective(700px)rotateY(-10deg)rotate(-7deg);box-shadow:14px 20px 26px #253e6c28}.book img{width:100%;height:auto;display:block}.book-caption{color:#41658e;align-items:flex-start;gap:11px;display:flex;position:absolute;top:136px;left:258px}.book-caption strong{font-size:12px;font-weight:550;line-height:1.6}.book-caption span{color:#687d97;margin-top:10px;font-size:10px;display:block}.orbit{border:1px solid #ccdbef;border-radius:50%;position:absolute;transform:rotate(-20deg)}.orbit-one{width:500px;height:100px;top:160px;left:-60px}.orbit-two{width:570px;height:180px;top:122px;left:-94px}.graphic-cross{color:#7290bb;font-size:25px;font-weight:300;position:absolute;top:69px;right:12px}.form-card{border:1px solid var(--border);background:#fff;border-radius:9px;align-self:start;padding:30px 31px 23px;box-shadow:0 12px 40px #1733640a}.form-top{justify-content:space-between;align-items:center;display:flex}.form-kicker{letter-spacing:.14em;color:#687a93;font-size:9px;font-weight:650}.file-pill{color:#526f9f;border:1px solid #e2e8f3;border-radius:4px;align-items:center;gap:5px;padding:5px 7px;font-size:9px;display:flex}.form-card h2{letter-spacing:-.8px;margin:15px 0 8px;font-family:Manrope,Arial,sans-serif;font-size:27px;font-weight:650}.form-sub{color:var(--muted);margin:0 0 23px;font-size:12px;line-height:1.6}fieldset{border:0;min-width:0;margin:0;padding:0}form label:not(.checkbox-label){margin-bottom:7px;font-size:11px;font-weight:550;display:block}label>span:not(:last-child){color:inherit}label>span[aria-label],.required-star{color:var(--blue)}input:not([type=checkbox]),select{height:44px;color:var(--ink);background:#fff;border:1px solid #d7dfeb;border-radius:4px;width:100%;min-width:0;margin-bottom:17px;padding:0 12px;font-size:12px;transition:border-color .2s}input::placeholder{color:#7b899c}select:has(option[value=""]:checked){color:#7b899c}.fields-row{grid-template-columns:1fr 1fr;gap:14px;display:grid}.optional{border-top:1px solid #e8edf4;border-bottom:1px solid #e8edf4;margin:0 0 19px}.optional summary{justify-content:space-between;align-items:center;min-height:45px;font-size:11px;display:flex}.optional summary>span{color:#77859b;align-items:center;gap:8px;font-size:10px;display:flex}.optional summary::marker{content:""}.optional[open] summary svg{transform:rotate(180deg)}.optional-fields{padding-top:10px}.checkbox-label{color:#647188;cursor:pointer;align-items:flex-start;gap:9px;margin:0 0 12px;font-size:10px;line-height:1.7;display:flex}.checkbox-label input{-webkit-appearance:auto;appearance:auto;accent-color:var(--blue);flex:none;width:14px;height:14px;margin:2px 0 0}.inline-link{color:var(--blue);text-underline-offset:2px;font:inherit;background:0 0;border:0;padding:0;text-decoration:underline}.marketing{margin-bottom:23px}.primary{background:var(--blue);color:#fff;border:0;border-radius:4px;justify-content:center;align-items:center;gap:12px;width:100%;min-height:48px;padding:12px 16px;font-size:13px;font-weight:550;display:flex}.primary svg:last-child{margin-left:auto}.primary:hover{background:#194ec5}.form-footnote{text-align:center;color:#75829a;justify-content:center;align-items:center;gap:6px;margin:13px 0 0;font-size:9px;line-height:1.7;display:flex}.honeypot{clip-path:inset(50%);width:1px;height:1px;position:absolute;overflow:hidden}footer{color:#748297;justify-content:space-between;gap:20px;max-width:1280px;margin:auto;padding:30px 52px;font-size:10px;display:flex}footer button{font-size:10px!important}.success{flex-direction:column;justify-content:center;align-items:flex-start;min-height:540px;display:flex}.success-icon{color:#2b6d4b;background:#eaf3ee;border-radius:50%;place-items:center;width:62px;height:62px;margin-bottom:22px;display:grid}.success p:not(.eyebrow){color:var(--muted);font-size:13px;line-height:1.8}.success .primary{margin:17px 0}.success .primary svg{margin:0}.success small{color:var(--muted);font-size:10px}.return-link{color:var(--blue);background:0 0;border:0;align-items:center;gap:10px;margin-top:17px;padding:13px 0;font-size:11px;display:flex}.error{background:#fff2f2;border-radius:4px;padding:10px;color:#a92734!important;font-size:12px!important}.spinner{border:2px solid #ffffff50;border-top-color:#fff;border-radius:50%;width:15px;height:15px;animation:.7s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}dialog{border:1px solid var(--border);width:calc(100% - 40px);max-width:560px;color:var(--ink);border-radius:10px;padding:30px}dialog::backdrop{-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px);background:#11243c88}.dialog-top{color:var(--blue);justify-content:space-between;align-items:center;display:flex}.dialog-top button{width:44px;height:44px;color:var(--ink);background:0 0;border:0;place-items:center;display:grid}dialog h2{margin:12px 0;font-size:22px}dialog p{color:var(--muted);margin-bottom:25px;font-size:14px;line-height:1.9}html[lang=zh-CN] h1{letter-spacing:-1px;font-size:57px;line-height:1.25}html[lang=zh-CN] .checkbox-label{font-size:11px;line-height:1.9}@media (min-width:1400px){.hero{padding-top:70px}.header{max-width:1380px}.hero{gap:110px;max-width:1200px}}@media (max-width:1279px){.hero{grid-template-columns:1.05fr 1fr;gap:45px;margin-inline:52px}h1{font-size:55px}.form-card{padding:27px 24px}.book-caption{left:235px}.book-caption strong{font-size:10px}.book-caption span{font-size:9px}}@media (max-width:1000px){.header{padding:20px 32px}.hero{gap:28px;margin-inline:32px}.form-card{padding:24px 21px}h1{letter-spacing:-2.7px;font-size:47px}.intro{font-size:14px}.publishers strong{font-size:11px}.book-caption{left:215px}.book-caption strong{display:none}.book-caption span{margin-top:0}.book{left:25px}.fields-row{grid-template-columns:1fr;gap:0}html[lang=zh-CN] h1{font-size:44px}}@media (max-width:720px){.review-strip{padding:8px 18px;font-size:9px}.header{padding:13px 21px}.wordmark{gap:10px;font-size:12px}.resource-label{display:none}.header-right{gap:0}.language{gap:6px;font-size:11px}.hero{flex-direction:column;gap:26px;margin-inline:22px;padding:35px 0;display:flex}.eyebrow{font-size:9px}h1{letter-spacing:-2.6px;margin:20px 0;font-size:49px;line-height:1.11}.intro{margin-bottom:20px;font-size:14px;line-height:1.75}.publishers strong{font-size:11px}.book-area{height:235px;margin-top:22px}.book{width:140px;top:7px;left:30px}.book-caption{top:115px;left:200px}.book-caption strong{font-size:11px;display:block}.book-caption span{margin-top:9px;font-size:9px}.orbit-one{top:130px}.orbit-two{top:100px}.form-card{width:100%;padding:25px 24px}.form-card h2{font-size:26px}.form-sub{font-size:12px}.fields-row{grid-template-columns:1fr 1fr;gap:12px}.checkbox-label{font-size:11px}.form-footnote{font-size:10px}input:not([type=checkbox]),select{height:46px;font-size:16px}form label:not(.checkbox-label){font-size:12px}.primary{min-height:50px;font-size:14px}.optional summary{font-size:12px}footer{flex-wrap:wrap;gap:15px;padding:25px 22px}footer>span:last-child{width:100%}.success{min-height:430px}html[lang=zh-CN] h1{font-size:43px}}@media (max-width:370px){h1{font-size:43px}.fields-row{grid-template-columns:1fr}.book-caption{left:190px}.book-caption strong{font-size:10px}}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,:before,:after{transition:none!important;animation:none!important}}.mobile-get{display:none}@media (max-width:720px){.mobile-get{color:var(--blue);border-bottom:1px solid #b6cafa;align-items:center;gap:18px;margin-top:9px;padding:12px 0 7px;font-size:13px;font-weight:600;display:inline-flex}h1{font-size:44px}}.brand-logo{width:216px;height:auto;display:block}.wordmark{min-height:41px}footer{border-top:1px solid var(--border)}@media (max-width:720px){.brand-logo{width:180px}.wordmark{min-height:36px}}.hero-copy>.eyebrow{align-items:flex-start;line-height:1.7}.hero-copy>.eyebrow .blue-dot{flex:none;margin-top:5px}.form-kicker{max-width:calc(100% - 55px);line-height:1.7}.file-pill{flex:none}.optional-heading{justify-content:space-between;align-items:center;min-height:45px;font-size:11px;display:flex}.optional-heading>span{color:#77859b;font-size:10px}.book-area{height:auto;min-height:400px;padding-bottom:24px}.book{width:160px;top:74px;left:24px}.book-caption{margin-left:43%;padding:28px 14px 0 0;display:block;position:relative;top:auto;left:auto}.book-caption-title{align-items:flex-start;gap:9px;display:flex}.book-caption-title svg{flex:none;margin-top:2px}.book-caption strong{font-size:12px;line-height:1.5;display:block}.book-caption .book-meta{margin:9px 0 0 26px;font-size:10px}.book-contents{margin-top:21px}.book-contents h2{letter-spacing:.12em;text-transform:uppercase;color:var(--ink);margin:0 0 12px;font-size:10px;font-weight:650}.book-contents ul{gap:10px;margin:0;padding:0;list-style:none;display:grid}.book-contents li{color:#41658e;grid-template-columns:19px 1fr;gap:6px;font-size:11px;line-height:1.5;display:grid}.book-caption .chapter-number{color:#6f85a4;margin:2px 0 0;font-size:9px}.book-contents li>span:last-child{color:inherit;margin:0;font-size:11px}.graphic-cross{top:16px}@media (min-width:721px) and (max-width:1000px){.book{width:110px;top:90px;left:8px}.book-caption{margin-left:38%;padding-right:5px}.book-caption strong{font-size:11px}.book-contents li>span:last-child{font-size:10px}.book-contents li{grid-template-columns:16px 1fr;gap:3px}}@media (max-width:720px){.book-area{height:auto;min-height:390px;padding-bottom:24px}.book{width:112px;top:65px;left:9px}.book-caption{margin-left:140px;padding:22px 6px 0 0;top:auto;left:auto}.book-caption strong{font-size:11px}.book-contents{margin-top:18px}.book-contents ul{gap:10px}.book-contents li{grid-template-columns:17px 1fr;gap:4px}.book-contents li>span:last-child{font-size:11px}.book-caption .book-meta{margin-left:0;font-size:9px}.graphic-cross{display:none}}@media (max-width:370px){.book{width:93px;left:5px}.book-caption{margin-left:116px}.book-contents li>span:last-child{font-size:10px}}.form-top{justify-content:flex-end}