/* RKB v5: clinical light, visual, responsive learning system */
:root{--navy:#17334A;--teal:#087F78;--teal2:#DFF4F0;--blue:#EAF3FA;--gold:#B7811C;--ink:#F4F8FB;--line:#D7E4EB;--muted:#526779;--white:#fff;--shadow:0 10px 28px rgba(26,66,90,.07)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:linear-gradient(180deg,#FAFCFD,#F1F7FA);color:var(--navy);font-family:'IBM Plex Sans',Arial,sans-serif;line-height:1.6}a{color:var(--teal)}img{max-width:100%}.rkb-head{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.94);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}.rkb-nav{max-width:1180px;margin:auto;padding:13px 22px;display:flex;justify-content:space-between;align-items:center;gap:18px}.rkb-brand{text-decoration:none;color:var(--navy);font-weight:700;display:flex;align-items:center;gap:10px}.rkb-brand-mark{display:grid;place-items:center;width:34px;height:34px;border-radius:11px;background:var(--teal2);color:var(--teal);font-size:19px}.rkb-links{display:flex;gap:16px;flex-wrap:wrap;align-items:center}.rkb-links a{text-decoration:none;font-size:13px;color:var(--muted)}.rkb-links a:hover{color:var(--teal)}.page-wrap{max-width:1120px;margin:auto;padding:30px 22px 70px}.back-link{font-size:12px;text-decoration:none;font-weight:600}.hero{display:grid;grid-template-columns:1.08fr .92fr;gap:26px;align-items:center;padding:32px 0 25px}.eyebrow{font:600 11px 'IBM Plex Mono',monospace;letter-spacing:.12em;text-transform:uppercase;color:var(--teal)}h1,h2,h3{font-family:'Space Grotesk','IBM Plex Sans',sans-serif;line-height:1.12;letter-spacing:-.025em}h1{font-size:clamp(34px,5vw,54px);margin:10px 0 14px}h2{font-size:clamp(24px,3vw,34px);margin:0 0 12px}h3{font-size:19px;margin:0 0 8px}.lead{font-size:17px;color:var(--muted);max-width:64ch}.hero-visual{background:linear-gradient(145deg,#E6F5F3,#F2F7FA);border:1px solid #CFE4E8;border-radius:22px;padding:18px;box-shadow:var(--shadow);overflow:hidden}.hero-visual img{display:block;width:100%;max-height:330px;object-fit:contain;border-radius:12px}.hero-visual figcaption,.caption{font-size:11px;color:var(--muted);margin-top:9px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:1px solid #C8DCE4;background:#fff;color:var(--navy);text-decoration:none;padding:10px 14px;border-radius:10px;font-weight:600;font-size:13px;cursor:pointer}.btn.primary{background:var(--teal);color:#fff;border-color:var(--teal)}.btn:hover{transform:translateY(-1px);box-shadow:var(--shadow)}.actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:20px}.section{padding:28px 0}.section-intro{color:var(--muted);max-width:70ch;margin-top:-2px}.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px}.grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}.card{background:#fff;border:1px solid var(--line);border-radius:17px;overflow:hidden;box-shadow:0 4px 16px rgba(26,66,90,.035)}.card-pad{padding:18px}.card p{color:var(--muted);font-size:14px;margin:7px 0 13px}.card-img{width:100%;height:170px;object-fit:cover;background:#EAF3F7;display:block}.icon-art{height:130px;display:grid;place-items:center;background:linear-gradient(135deg,#E3F5F2,#F1F7FA);font-size:55px}.tag{display:inline-block;border-radius:999px;padding:5px 9px;font-size:10px;font-weight:700;letter-spacing:.04em;background:#EAF8F5;color:#087F78;border:1px solid #B7DFDA}.tag.gold{background:#FFF8E8;color:#8D610E;border-color:#E8D5A7}.tag.blue{background:#EEF6FD;color:#326EA3;border-color:#C7DDF0}.stat-row{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:20px 0}.stat{background:#fff;border:1px solid var(--line);border-radius:13px;padding:13px}.stat strong{font:700 22px 'Space Grotesk',sans-serif;display:block;color:var(--teal)}.stat span{font-size:11px;color:var(--muted)}.lesson-box{background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px;box-shadow:var(--shadow);margin:16px 0}.lesson-head{display:flex;gap:12px;align-items:flex-start}.lesson-icon{width:46px;height:46px;flex:0 0 46px;border-radius:13px;background:var(--teal2);display:grid;place-items:center;font-size:25px}.lesson-box p,.lesson-box li{color:#415D70}.visual-flow{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin:16px 0}.flow-step{background:#F4F9FB;border:1px solid var(--line);border-radius:12px;padding:13px;position:relative}.flow-step b{display:block;color:var(--teal);font-size:12px;margin-bottom:5px}.flow-step span{font-size:12px;color:var(--muted)}.quiz{background:#F3F9FA;border:1px solid #CFE4E8;border-radius:15px;padding:18px;margin-top:17px}.quiz p{font-weight:600;color:var(--navy)}.answers{display:grid;gap:8px}.answer{background:#fff;border:1px solid var(--line);border-radius:10px;padding:11px 13px;text-align:left;color:var(--navy);cursor:pointer;font:14px 'IBM Plex Sans',sans-serif}.answer:hover,.answer:focus-visible{border-color:var(--teal);background:#EAF8F5}.answer:disabled{cursor:default}.answer-feedback{display:none;margin-top:12px;padding:12px;border-radius:10px;background:#EAF8F5;border:1px solid #B7DFDA;color:#365568;font-size:13px}.answer-feedback.show{display:block}.answer-feedback strong{display:block;color:var(--teal);margin-bottom:3px}.note{background:#FFF8E8;border-left:3px solid #C3912D;padding:12px 14px;border-radius:8px;color:#5B6570;font-size:12px;margin:15px 0}.mini-table{width:100%;border-collapse:collapse;font-size:13px;margin:12px 0}.mini-table th,.mini-table td{text-align:left;padding:10px;border-bottom:1px solid var(--line)}.mini-table th{background:#F1F7FA;color:#415D70}.mini-table td{color:#365568}.tab-row{display:flex;gap:8px;flex-wrap:wrap;margin:15px 0}.tab{border:1px solid var(--line);background:#fff;color:var(--muted);border-radius:999px;padding:9px 13px;cursor:pointer;font-size:12px;font-weight:600}.tab[aria-selected=true]{background:var(--teal2);border-color:#8BCFC5;color:#075E59}.tab-panel{display:none}.tab-panel.active{display:block}.metric-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}.metric{background:#fff;border:1px solid var(--line);border-radius:14px;padding:15px}.metric label{font-size:11px;color:var(--muted);display:block}.metric output{display:block;font:700 25px 'Space Grotesk',sans-serif;color:var(--teal);margin:5px 0}.metric small{color:var(--muted);font-size:11px}.field{display:grid;gap:5px;margin:10px 0}.field label{font-size:12px;font-weight:600}.field input,.field select{width:100%;padding:11px;border:1px solid #C8DCE4;border-radius:9px;background:#F8FBFC;color:var(--navy);font:14px 'IBM Plex Sans',sans-serif}.footer{border-top:1px solid var(--line);padding:24px 22px;color:var(--muted);font-size:12px;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}.footer a{text-decoration:none}.roadmap-svg{width:100%;height:auto;display:block}.world-region{cursor:pointer;transition:opacity .2s}.world-region:hover{opacity:.72}.world-region:focus{outline:none;stroke:#B7811C;stroke-width:4}.region-card{border:1px solid var(--line);border-radius:14px;padding:15px;background:#fff}.region-card h3{margin-bottom:5px}.region-card p{font-size:13px;color:var(--muted);margin:0}.timeline{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.phase{border-top:4px solid var(--teal);padding:14px;background:#fff;border-radius:0 0 12px 12px;box-shadow:0 4px 14px rgba(26,66,90,.04)}.phase:nth-child(2){border-color:#4F8FB9}.phase:nth-child(3){border-color:#B7811C}.phase:nth-child(4){border-color:#7C77B8}.phase .phase-no{font:11px 'IBM Plex Mono',monospace;color:var(--muted)}.phase h3{margin:7px 0}.phase p{font-size:12px;color:var(--muted)}.footer-note{font-size:11px;color:var(--muted)}
@media(max-width:800px){.hero{grid-template-columns:1fr}.grid{grid-template-columns:repeat(2,minmax(0,1fr))}.visual-flow{grid-template-columns:repeat(2,1fr)}.metric-grid{grid-template-columns:repeat(2,1fr)}.timeline{grid-template-columns:repeat(2,1fr)}.rkb-nav{align-items:flex-start}.rkb-links{gap:9px;justify-content:flex-end}}
@media(max-width:540px){.page-wrap{padding:20px 15px 50px}.rkb-nav{display:block}.rkb-links{margin-top:9px;justify-content:flex-start}.grid,.grid.two{grid-template-columns:1fr}.stat-row{grid-template-columns:1fr}.metric-grid{grid-template-columns:1fr 1fr}.visual-flow{grid-template-columns:1fr 1fr}.timeline{grid-template-columns:1fr}.hero{padding-top:20px}.lesson-box{padding:16px}.rkb-brand{font-size:14px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}