:root{--bg:#F5FAFE;--deep:#E7F2FA;--card:#FFFFFF;--sub:#D7EAF6;--title:#16324A;--text:#2A4156;--muted:#4E6A80;--help:#6E8899;--blue:#4AA3E0;--lightblue:#6BB8EC;--dark:#1B4A6E;--fog:#EAF5FC;--border:rgba(74,163,224,.16);--border2:rgba(74,163,224,.42);--shadow:0 12px 28px rgba(27,74,110,.08)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;font-size:15px;line-height:1.7;overflow-x:hidden}a{color:inherit;text-decoration:none}button{font:inherit}img{max-width:100%;display:block}.no-scroll{overflow:hidden}.topline{position:fixed;z-index:90;top:0;left:0;right:0;height:22px;background:var(--dark);color:#fff}.topline-inner{max-width:1120px;height:100%;margin:auto;padding:0 16px;display:flex;align-items:center;justify-content:space-between;font-size:12px}.top-brand{font-weight:700;letter-spacing:.05em}.text-button{appearance:none;border:0;background:transparent;color:#fff;padding:0 8px;height:22px;cursor:pointer}.masthead{position:fixed;z-index:89;top:22px;left:0;right:0;height:60px;background:#fff;border-bottom:1px solid var(--border);display:grid;grid-template-columns:1fr auto 1fr;align-items:center;padding:0 max(16px,calc((100vw - 1120px)/2));box-shadow:0 5px 15px rgba(27,74,110,.03)}.mast-logo{justify-self:start;min-width:44px;min-height:44px;display:flex;align-items:center}.logo-image{height:28px;width:auto;object-fit:contain}.logo-fallback{font-size:16px;font-weight:800;color:var(--dark)}.drawer-open,.app-link{height:44px;min-width:72px;display:inline-flex;align-items:center;justify-content:center;border-radius:11px}.drawer-open{justify-self:center;background:var(--fog);border:1px solid var(--border2);color:var(--dark);cursor:pointer}.app-link{justify-self:end;background:linear-gradient(135deg,#6BB8EC 0%,#4AA3E0 55%,#1B4A6E 100%);color:#fff;padding:0 16px;font-weight:700}.section-tabs{position:fixed;z-index:88;top:82px;left:0;right:0;height:40px;background:var(--fog);border-bottom:1px solid var(--border)}.section-tabs-inner{height:100%;display:flex;align-items:center;justify-content:center;gap:12px}.section-tabs a{font-size:13px;height:30px;min-width:72px;padding:0 16px;display:flex;align-items:center;justify-content:center;border-radius:9px;color:var(--dark)}.section-tabs a.is-active{background:var(--blue);color:#fff}.site-main{padding-top:146px;min-height:60vh}.wrap{max-width:1120px;margin:0 auto;padding:0 16px}.page-hero{padding:34px 0 26px}.eyebrow{font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--blue);font-weight:800;margin-bottom:8px}.page-hero h1{font-size:24px;line-height:1.3;color:var(--title);margin:0 0 12px}.page-hero p{margin:0;max-width:780px;color:var(--muted)}h2{font-size:20px;line-height:1.4;color:var(--title);margin:0 0 12px}h3{font-size:16px;line-height:1.4;color:var(--title);margin:0 0 8px}p{margin:0 0 14px}.section{padding:20px 0 34px}.section-head{display:flex;align-items:end;justify-content:space-between;gap:12px;margin-bottom:16px}.section-head p{margin:0;color:var(--muted);max-width:660px}.card{background:#fff;border:1px solid var(--border);border-radius:14px;box-shadow:var(--shadow);padding:22px}.grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.stack{display:grid;gap:16px}.image-slot{width:100%;background:var(--fog);border:1px solid var(--border);border-radius:12px;display:flex;align-items:center;justify-content:center;overflow:hidden}.image-slot img{width:100%;height:100%;object-fit:contain;object-position:center}.slot-260{height:260px}.slot-200{height:200px}.slot-180{height:180px}.slot-app{height:360px}.cover-block{display:grid;gap:18px}.cover-copy{text-align:left;max-width:800px}.cover-copy .brandline{font-weight:800;color:var(--dark);letter-spacing:.08em;margin-bottom:8px}.cover-copy h1{font-size:24px;line-height:1.3;margin:0 0 12px;color:var(--title)}.button-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}.btn{height:44px;padding:0 18px;border-radius:11px;display:inline-flex;align-items:center;justify-content:center;font-size:14px;font-weight:700;white-space:nowrap}.btn-primary{background:linear-gradient(135deg,#6BB8EC 0%,#4AA3E0 55%,#1B4A6E 100%);color:#fff}.btn-secondary{background:#fff;border:1px solid var(--border2);color:var(--dark)}.btn:hover,.masthead a:hover,.masthead button:hover,.section-tabs a:hover,.mobile-bar a:hover{filter:brightness(.98);transform:translateY(-1px)}a:focus-visible,button:focus-visible{outline:3px solid rgba(74,163,224,.32);outline-offset:2px}.number-list{display:grid;gap:10px}.number-item{display:grid;grid-template-columns:54px 1fr;gap:12px;align-items:start;padding:14px 0;border-top:1px solid var(--border)}.number-item:first-child{border-top:0}.number{width:42px;height:42px;border-radius:11px;background:var(--blue);color:#fff;display:grid;place-items:center;font-weight:800}.shelf{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.shelf a,.index-link{background:#fff;border:1px solid var(--border);border-radius:12px;padding:16px;display:block}.shelf a:hover,.index-link:hover{border-color:var(--border2);box-shadow:var(--shadow)}.timeline{position:relative;padding-left:26px}.timeline:before{content:"";position:absolute;left:8px;top:10px;bottom:10px;width:2px;background:var(--sub)}.timeline-item{position:relative;padding:0 0 22px}.timeline-item:before{content:"";position:absolute;left:-23px;top:7px;width:10px;height:10px;background:var(--blue);border:3px solid var(--fog);border-radius:50%}.status{display:inline-flex;align-items:center;min-height:28px;padding:0 10px;border-radius:999px;background:var(--fog);color:var(--dark);font-size:12px;font-weight:700}.note-card{border-left:4px solid var(--blue)}.prose{background:#fff;border:1px solid var(--border);border-radius:14px;padding:24px;box-shadow:var(--shadow)}.prose p:last-child{margin-bottom:0}.prose ul{margin:0 0 14px;padding-left:1.2em}.prose li{margin-bottom:8px}.terms{display:grid;gap:16px}.term{background:#fff;border:1px solid var(--border);border-radius:12px;padding:20px}.faq-list{display:grid;gap:14px}.faq-item{background:#fff;border:1px solid var(--border);border-radius:12px;padding:20px}.faq-item h2{font-size:16px;margin-bottom:8px}.tag-row{display:flex;flex-wrap:wrap;gap:8px}.tag{padding:6px 10px;border-radius:999px;background:var(--fog);color:var(--dark);font-size:13px}.app-layout{display:grid;grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr);gap:22px;align-items:start}.app-icon{width:48px;height:48px;object-fit:contain}.notice{background:var(--deep);border:1px solid var(--border);border-radius:12px;padding:18px;color:var(--dark)}.site-footer{background:var(--dark);color:var(--deep);border-top:1px solid rgba(231,242,250,.2);padding:34px 0 calc(72px + env(safe-area-inset-bottom))}.footer-inner{max-width:1120px;margin:auto;padding:0 16px}.footer-brand{display:flex;align-items:center;gap:12px;margin-bottom:22px}.footer-logo{height:28px;width:auto;object-fit:contain;filter:brightness(0) invert(1)}.footer-brand strong{display:block;color:#fff}.footer-brand span{font-size:12px;color:var(--deep)}.footer-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}.footer-grid h3{color:#fff;font-size:13px;margin-bottom:8px}.footer-grid a{display:block;font-size:13px;color:var(--deep);padding:3px 0}.footer-note,.copyright{font-size:13px;color:var(--deep)}.footer-note{margin-top:22px;padding-top:18px;border-top:1px solid rgba(231,242,250,.2)}.copyright{margin-bottom:0}.overlay{position:fixed;z-index:119;inset:0;background:rgba(22,50,74,.32);opacity:0;pointer-events:none;transition:opacity .2s}.overlay.is-open{opacity:1;pointer-events:auto}.drawer{position:fixed;z-index:120;top:0;right:0;width:400px;max-width:86vw;height:100dvh;background:#fff;box-shadow:-18px 0 45px rgba(27,74,110,.16);transform:translateX(102%);visibility:hidden;pointer-events:none;transition:transform .22s,visibility .22s;display:flex;flex-direction:column}.drawer.is-open{transform:translateX(0);visibility:visible;pointer-events:auto}.drawer-head{height:72px;display:flex;align-items:center;justify-content:space-between;padding:0 18px;border-bottom:1px solid var(--border)}.drawer-brand{display:flex;align-items:center;gap:10px}.drawer-logo{height:28px;width:auto;object-fit:contain}.drawer-close,.search-close{height:44px;padding:0 14px;border-radius:10px;border:1px solid var(--border2);background:#fff;color:var(--dark);cursor:pointer}.drawer-scroll{overflow:auto;padding:16px 18px 28px}.drawer-scroll section{padding-bottom:16px}.drawer-scroll section h2{font-size:13px;color:var(--help);margin-bottom:8px}.drawer-scroll a{display:block;padding:12px;border-radius:10px}.drawer-scroll a:hover{background:var(--fog)}.drawer-scroll b{display:block;color:var(--title)}.drawer-scroll span{display:block;color:var(--muted);font-size:13px;margin-top:2px}.search-layer{position:fixed;z-index:118;top:82px;left:0;right:0;visibility:hidden;pointer-events:none;opacity:0;transition:.2s}.search-layer.is-open{visibility:visible;pointer-events:auto;opacity:1}.search-card{max-width:760px;margin:12px auto 0;padding:18px;background:#fff;border:1px solid var(--border);border-radius:14px;box-shadow:var(--shadow)}.search-head{display:flex;align-items:center;justify-content:space-between;gap:12px}.search-head h2{font-size:18px;margin:0}.search-presets{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}.search-presets a{min-height:44px;padding:0 16px;display:inline-flex;align-items:center;border-radius:10px;background:var(--fog);color:var(--dark);font-weight:700}.mobile-bar{display:none}
@media(max-width:760px){.section-tabs{display:none}.site-main{padding-top:104px;padding-bottom:54px}.masthead{grid-template-columns:1fr auto 1fr}.mast-logo{max-width:90px}.app-link{padding:0 10px;min-width:64px}.drawer-open{min-width:64px}.grid-3,.grid-2,.app-layout,.shelf,.footer-grid{grid-template-columns:1fr}.slot-260{height:220px}.slot-200{height:190px}.slot-180{height:170px}.slot-app{height:320px}.page-hero{padding-top:26px}.search-layer{top:0;bottom:0;background:var(--dark);padding:16px}.search-layer.is-open{display:flex;align-items:flex-start}.search-card{margin:0;width:100%;max-width:none;background:var(--dark);border-color:rgba(255,255,255,.18);box-shadow:none;color:#fff}.search-head h2{color:#fff}.search-close{background:transparent;color:#fff;border-color:rgba(255,255,255,.35)}.search-presets a{background:rgba(255,255,255,.1);color:#fff;border:1px solid rgba(255,255,255,.16)}.mobile-bar{position:fixed;z-index:89;left:0;right:0;bottom:0;display:grid;grid-template-columns:repeat(5,1fr);height:calc(48px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);background:#fff;border-top:1px solid var(--border);box-shadow:0 -8px 24px rgba(27,74,110,.08)}.mobile-bar a{display:flex;align-items:center;justify-content:center;font-size:13px;min-height:48px;color:var(--dark)}.mobile-bar a.is-active{background:var(--blue);color:#fff}.site-footer{padding-bottom:calc(72px + env(safe-area-inset-bottom))}.section-head{align-items:start;flex-direction:column}.number-item{grid-template-columns:46px 1fr}.card,.prose,.term{padding:18px}}
@media(min-width:761px){.site-footer{padding-bottom:34px}}