:root{--c-primary:#0d2d5e;--c-primary-dark:#0a2349;--c-primary-soft:#0d2d5e12;--c-accent:#c49e5a;--c-success:#17845a;--c-success-soft:#e8f5ee;--c-text:#1f2329;--c-text-muted:#5b6472;--c-border:#e4e7ec;--c-bg:#fff;--c-bg-alt:#f5f6f8;--radius-lg:20px;--radius:14px;--header-h:64px;--font:-apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", Arial, sans-serif}*,:before,:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%;-moz-text-size-adjust:100%;text-size-adjust:100%}@media (prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}}body{font-family:var(--font);color:var(--c-text);background:var(--c-bg);-webkit-font-smoothing:antialiased;margin:0;font-size:16px;line-height:1.7}h1,h2,h3,p,ul,dl,dd,figure{margin:0}ul{padding:0;list-style:none}a{color:inherit;text-decoration:none}a:focus-visible{outline:2px solid var(--c-accent);outline-offset:3px;border-radius:4px}.container{width:100%;max-width:1120px;margin:0 auto;padding:0 24px}.skip-link{z-index:100;background:var(--c-primary);color:#fff;border-radius:8px;padding:8px 14px;position:absolute;top:-48px;left:16px}.skip-link:focus{top:12px}.site-header{z-index:50;border-bottom:1px solid var(--c-border);-webkit-backdrop-filter:saturate(180%)blur(12px);backdrop-filter:saturate(180%)blur(12px);background:#ffffffeb;position:sticky;top:0}.header-inner{height:var(--header-h);justify-content:space-between;align-items:center;display:flex}.brand{align-items:center;gap:10px;display:inline-flex}.brand-mark{flex-shrink:0;width:32px;height:32px}.brand-name{letter-spacing:.06em;color:var(--c-primary);font-size:20px;font-weight:700}.site-nav{color:var(--c-text-muted);gap:32px;font-size:15px;display:flex}.site-nav a{transition:color .15s}.site-nav a:hover{color:var(--c-primary)}.hero{color:#fff;background:radial-gradient(640px 360px at 88% 12%,#c49e5a2e,#0000 70%),radial-gradient(720px 480px at 8% 100%,#4a80d647,#0000 70%),linear-gradient(135deg,#0a2349 0%,#0d2d5e 45%,#17437f 100%);position:relative;overflow:hidden}.hero:before{content:"";pointer-events:none;background-image:linear-gradient(#ffffff0a 1px,#0000 1px),linear-gradient(90deg,#ffffff0a 1px,#0000 1px);background-size:48px 48px;position:absolute;inset:0;-webkit-mask-image:linear-gradient(#000 0%,#0000 90%);mask-image:linear-gradient(#000 0%,#0000 90%)}.hero-inner{grid-template-columns:minmax(0,1.1fr) minmax(0,.9fr);align-items:center;gap:64px;padding-top:96px;padding-bottom:104px;display:grid;position:relative}.hero-eyebrow{color:#ffffffdb;letter-spacing:.04em;background:#ffffff14;border:1px solid #ffffff29;border-radius:999px;align-items:center;gap:8px;padding:6px 14px;font-size:14px;display:inline-flex}.hero-eyebrow .dot{background:var(--c-accent);border-radius:50%;width:6px;height:6px}.hero-title{letter-spacing:.08em;margin-top:24px;font-size:64px;font-weight:800;line-height:1.12}.hero-lead{color:#e7c98f;letter-spacing:.02em;margin-top:16px;font-size:24px;font-weight:600}.hero-desc{color:#ffffffc2;max-width:34em;margin-top:20px;font-size:16px}.hero-points{color:#ffffffeb;flex-wrap:wrap;gap:12px 28px;margin-top:32px;font-size:15px;display:flex}.hero-points li{align-items:center;gap:8px;display:inline-flex}.hero-points svg{fill:none;width:18px;height:18px;stroke:var(--c-accent);stroke-width:2.4px;stroke-linecap:round;stroke-linejoin:round}.demo{justify-self:end;width:100%;max-width:420px;position:relative}.demo:before{content:"";border-radius:var(--radius-lg);background:#ffffff1a;border:1px solid #ffffff24;position:absolute;inset:18px -14px -14px 18px}.demo-card{border-radius:var(--radius-lg);color:var(--c-text);background:#fff;padding:24px;position:relative;box-shadow:0 24px 60px #04102661}.demo-head{align-items:center;gap:8px;font-size:13px;display:flex}.demo-type{background:var(--c-primary);color:#fff;border-radius:6px;padding:2px 10px;font-weight:600}.demo-tag{background:var(--c-primary-soft);color:var(--c-primary);border-radius:6px;padding:2px 10px}.demo-progress{color:var(--c-text-muted);font-variant-numeric:tabular-nums;margin-left:auto}.demo-bar{background:#eef0f4;border-radius:2px;height:4px;margin-top:14px;overflow:hidden}.demo-bar span{background:var(--c-accent);border-radius:2px;width:24%;height:100%;display:block}.demo-stem{margin-top:18px;font-size:16px;font-weight:600;line-height:1.75}.demo-options{gap:10px;margin-top:16px;display:grid}.demo-options li{border:1px solid var(--c-border);border-radius:10px;align-items:center;gap:12px;padding:10px 14px;font-size:15px;display:flex}.demo-options .opt{width:26px;height:26px;color:var(--c-text-muted);border:1px solid #cfd4dc;border-radius:50%;flex-shrink:0;place-items:center;font-size:13px;font-weight:600;display:inline-grid}.demo-options .is-correct{border-color:var(--c-success);background:var(--c-success-soft);color:var(--c-success);font-weight:600}.demo-options .is-correct .opt{border-color:var(--c-success);background:var(--c-success);color:#fff}.demo-result{margin-left:auto;font-size:13px}.demo-analysis{background:var(--c-bg-alt);color:var(--c-text-muted);border-radius:10px;margin-top:16px;padding:14px 16px;font-size:13px;line-height:1.75}.demo-analysis-title{color:var(--c-primary);margin-bottom:4px;font-weight:700}.section{scroll-margin-top:var(--header-h);padding:96px 0}.section-alt{background:var(--c-bg-alt)}.section-head{text-align:center;max-width:640px;margin:0 auto 48px}.section h2{letter-spacing:.04em;color:var(--c-primary);font-size:34px;font-weight:700;line-height:1.3}.section h2:after{content:"";background:var(--c-accent);border-radius:2px;width:36px;height:3px;margin:16px auto 0;display:block}.section-head p{color:var(--c-text-muted);margin-top:16px;font-size:16px}.feature-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:24px;display:grid}.feature-card{border:1px solid var(--c-border);border-radius:var(--radius);background:#fff;padding:28px;transition:border-color .2s,box-shadow .2s}.feature-card:hover{border-color:#0d2d5e3d;box-shadow:0 12px 32px #0d2d5e14}.feature-icon{background:var(--c-primary-soft);width:48px;height:48px;color:var(--c-primary);border-radius:12px;place-items:center;display:inline-grid}.feature-icon svg{fill:none;stroke:currentColor;stroke-width:1.8px;stroke-linecap:round;stroke-linejoin:round;width:24px;height:24px}.feature-card h3{margin-top:20px;font-size:18px;font-weight:700;line-height:1.4}.feature-card p{color:var(--c-text-muted);margin-top:8px;font-size:15px}.exam-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:24px;display:grid}.exam-card{--exam:var(--c-primary);border-radius:var(--radius);background:#fff;padding:28px 24px 24px;position:relative;overflow:hidden;box-shadow:0 1px 2px #1018280a}.exam-card:before{content:"";background:var(--exam);height:4px;position:absolute;inset:0 0 auto}.exam-sd{--exam:#0d2d5e}.exam-gd{--exam:#1a6c60}.exam-sz{--exam:#4d59c8}.exam-bj{--exam:#a07a36}.exam-badge{background:var(--exam);color:#fff;border-radius:14px;place-items:center;width:52px;height:52px;font-size:24px;font-weight:700;display:inline-grid}.exam-card h3{margin-top:18px;font-size:20px;font-weight:700;line-height:1.4}.exam-card>p{color:var(--c-text-muted);margin-top:6px;font-size:14px}.exam-tags{flex-wrap:wrap;gap:8px;margin-top:18px;display:flex}.exam-tags li{background:var(--c-bg-alt);color:var(--c-text-muted);border-radius:6px;padding:2px 10px;font-size:13px}.exam-note{text-align:center;color:var(--c-text-muted);margin-top:32px;font-size:14px}.about-inner{grid-template-columns:minmax(0,1fr) minmax(0,1fr);align-items:center;gap:64px;display:grid}.about-copy h2:after{margin-left:0}.about-copy p{color:var(--c-text-muted);margin-top:20px;font-size:16px}.about-copy h2+p{margin-top:28px}.about-info{border:1px solid var(--c-border);border-radius:var(--radius);background:#fff;padding:8px 28px}.about-info div{grid-template-columns:88px minmax(0,1fr);gap:16px;padding:18px 0;display:grid}.about-info div+div{border-top:1px solid var(--c-border)}.about-info dt{color:var(--c-text-muted);font-size:14px}.about-info dd{font-size:15px;font-weight:600}.site-footer{background:var(--c-primary-dark);color:#ffffffa8;font-size:14px}.footer-inner{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px 32px;padding-top:36px;padding-bottom:36px;display:flex}.footer-brand{flex-direction:column;gap:2px;display:flex}.footer-name{letter-spacing:.06em;color:#fff;font-size:18px;font-weight:700}.footer-legal{flex-wrap:wrap;gap:8px 24px;display:flex}.footer-legal a{color:#ffffffd1}.footer-legal a:hover{color:#fff;text-decoration:underline}@media (width<=960px){.hero-inner{grid-template-columns:minmax(0,1fr);gap:56px;padding-top:72px;padding-bottom:80px}.demo{justify-self:start}.feature-grid,.exam-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.about-inner{grid-template-columns:minmax(0,1fr);gap:40px}}@media (width<=600px){.container{padding:0 16px}.brand-mark{width:28px;height:28px}.brand-name{font-size:18px}.site-nav{gap:16px;font-size:14px}.hero-inner{padding-top:56px;padding-bottom:64px}.hero-title{font-size:44px}.hero-lead{font-size:19px}.hero-desc{font-size:15px}.demo:before{inset:14px -8px -10px 14px}.demo-card{padding:20px 18px}.section{padding:64px 0}.section-head{margin-bottom:36px}.section h2{font-size:26px}.feature-grid,.exam-grid{grid-template-columns:minmax(0,1fr);gap:16px}.feature-card{padding:22px}.about-info{padding:4px 20px}.about-info div{grid-template-columns:72px minmax(0,1fr)}.footer-inner{flex-direction:column;align-items:flex-start}}@media (width<=360px){.brand{gap:8px}.brand-name{font-size:16px}.site-nav{gap:10px;font-size:13px}}