.about-river.river-hero{flex-direction:column;min-height:calc(100svh - 80px);margin-top:-20px;margin-bottom:0;display:flex}@media (min-width:640px){.about-river.river-hero{margin-top:-24px}}@media (min-width:1024px){.about-river.river-hero{margin-top:-28px}}.about-river .river-hero-content{flex-direction:column;flex:1;justify-content:center;display:flex}.about-tagline{text-align:center;letter-spacing:.01em;max-width:680px;color:var(--gray-8);word-break:keep-all;margin:16px auto 28px;font-size:15px;font-weight:700;line-height:1.6}.about-letter{background:var(--bg-surface);border:1px solid var(--gray-2);border-radius:20px;width:100%;max-width:680px;margin:0 auto;padding:52px 60px;box-shadow:0 1px 2px #1018200a,0 16px 48px #10182012}.about-letter p{color:var(--gray-8);word-break:keep-all;margin:0 0 20px;font-size:15.5px;line-height:1.9}.about-letter p:last-child{margin-bottom:0}.about-letter-sign{text-align:right;margin-top:36px!important}.about-letter-name{color:var(--gray-9);margin-top:10px;font-size:17px;font-weight:700;display:block}.about-manual{width:100%;max-width:680px;margin:32px auto 8px}.about-h2{letter-spacing:.04em;text-transform:uppercase;color:var(--gray-6);margin:0 0 12px;font-size:13px;font-weight:700}.about-doc-list{flex-direction:column;gap:8px;margin:0;padding:0;list-style:none;display:flex}.about-doc-card{border:1px solid var(--gray-2);background:var(--bg-surface);color:inherit;transition:border-color var(--duration-fast), box-shadow var(--duration-fast), background var(--duration-fast);border-radius:12px;align-items:center;gap:14px;padding:16px 18px;text-decoration:none;display:flex}.about-doc-card:hover{border-color:var(--primary-3);background:var(--gray-0);text-decoration:none}.about-doc-icon{background:var(--primary-0);width:36px;height:36px;color:var(--primary-7);border-radius:10px;flex-shrink:0;justify-content:center;align-items:center;display:flex}.about-doc-icon-ops{background:var(--gray-1);color:var(--gray-7)}.about-doc-body{flex:1;min-width:0}.about-doc-title{color:var(--gray-9);font-size:14.5px;font-weight:600;line-height:1.4}.about-doc-sub{color:var(--gray-6);margin-top:3px;font-size:12.5px;line-height:1.5}.about-doc-arrow{color:var(--gray-4);flex-shrink:0}.about-doc-card:hover .about-doc-arrow{color:var(--primary-7)}@media (max-width:639px){.about-letter{border-radius:16px;padding:32px 24px}.about-tagline{margin-bottom:20px;font-size:14px}}.about-credits{width:100%;max-width:680px;margin:24px auto 8px}.about-credits-names{color:var(--gray-7);word-break:keep-all;margin:0;font-size:13.5px;line-height:1.7}