:root{--fkl-blue:#073b75;--fkl-blue2:#0c5da5;--fkl-yellow:#ffd43b;--fkl-ink:#10243e;--fkl-muted:#5e6b7b;--fkl-bg:#f4f8fc;--fkl-card:#fff;--fkl-border:#dfe8f2;--fkl-green:#0a8f64}
.fkl-app{font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--fkl-ink);background:var(--fkl-bg);line-height:1.65;border-radius:24px;overflow:hidden;max-width:1380px;margin:24px auto;box-shadow:0 24px 80px rgba(16,36,62,.08)}
.fkl-app *{box-sizing:border-box}.fkl-app a{color:var(--fkl-blue2)}
.fkl-hero{min-height:430px;padding:56px clamp(22px,5vw,70px);display:grid;grid-template-columns:1.5fr .65fr;gap:40px;align-items:center;color:#fff;background:radial-gradient(circle at 85% 20%,rgba(255,212,59,.22),transparent 25%),linear-gradient(135deg,#062d5b,#07539a 65%,#0874c5)}
.fkl-kicker,.fkl-section-title>span{font-size:12px;letter-spacing:.14em;font-weight:900;color:var(--fkl-yellow)}.fkl-hero h1{font-size:clamp(38px,5vw,68px);line-height:1.02;letter-spacing:-.045em;margin:12px 0 20px;color:#fff}.fkl-hero p{font-size:clamp(16px,2vw,21px);max-width:760px;color:#e6f2ff}.fkl-hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}.fkl-btn{display:inline-flex!important;align-items:center;justify-content:center;min-height:46px;padding:11px 18px;border-radius:13px;text-decoration:none!important;border:1px solid rgba(255,255,255,.35);background:rgba(255,255,255,.08);color:#fff!important;font-weight:800;cursor:pointer}.fkl-btn.fkl-primary{background:var(--fkl-yellow);border-color:var(--fkl-yellow);color:#17324f!important}
.fkl-hero-card{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.2);backdrop-filter:blur(12px);border-radius:24px;padding:30px;text-align:center;display:grid;justify-items:center;gap:8px}.fkl-hero-card small{color:#d9ecff}.fkl-ring{width:138px;height:138px;border-radius:50%;display:grid;place-items:center;font-size:25px;font-weight:900;background:conic-gradient(var(--fkl-yellow) var(--p,0%),rgba(255,255,255,.18) 0);position:relative}.fkl-ring:before{content:"";position:absolute;inset:10px;background:#0b4a86;border-radius:50%}.fkl-ring span{position:relative;z-index:2}
.fkl-toolbar{padding:30px clamp(18px,4vw,50px) 20px;background:#fff;border-bottom:1px solid var(--fkl-border);position:sticky;top:0;z-index:10}.fkl-search-wrap{display:flex;align-items:center;border:2px solid var(--fkl-border);border-radius:16px;padding:0 15px;background:#fff;max-width:900px;margin:auto}.fkl-search-wrap:focus-within{border-color:#7eb6e8;box-shadow:0 0 0 4px rgba(12,93,165,.08)}.fkl-search-wrap span{font-size:26px}.fkl-search-wrap input{width:100%;border:0!important;outline:0!important;box-shadow:none!important;background:transparent!important;padding:14px 12px!important;font-size:16px!important;color:var(--fkl-ink)!important}.fkl-filter-row{display:flex;gap:8px;overflow:auto;padding:14px 0 0;scrollbar-width:thin}.fkl-filter{white-space:nowrap;border:1px solid var(--fkl-border);background:#f7faff;color:#35516e;padding:7px 12px;border-radius:999px;font-weight:700;cursor:pointer}.fkl-filter.active{background:var(--fkl-blue);color:#fff;border-color:var(--fkl-blue)}
.fkl-cards{padding:28px clamp(18px,4vw,50px);display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}.fkl-card{display:grid;grid-template-columns:auto 1fr auto;gap:12px;align-items:center;padding:16px;border:1px solid var(--fkl-border);border-radius:16px;background:#fff;text-decoration:none!important;color:var(--fkl-ink)!important;transition:.2s}.fkl-card:hover{transform:translateY(-2px);box-shadow:0 10px 30px rgba(16,36,62,.08);border-color:#b9d0e7}.fkl-card-icon{font-size:26px}.fkl-card b{display:block;font-size:14px;line-height:1.25}.fkl-card small{font-size:10px;text-transform:uppercase;letter-spacing:.08em;color:var(--fkl-muted);font-weight:800}
.fkl-learning{padding:0 clamp(18px,4vw,50px) 30px}.fkl-module{scroll-margin-top:150px;background:#fff;border:1px solid var(--fkl-border);border-radius:22px;padding:28px;margin:18px 0;box-shadow:0 8px 28px rgba(16,36,62,.04)}.fkl-module-head{display:flex;gap:18px;justify-content:space-between;align-items:flex-start}.fkl-module-head h2{font-size:clamp(24px,3vw,38px);margin:5px 0 7px;line-height:1.14;letter-spacing:-.025em}.fkl-module-head p{margin:0;color:var(--fkl-muted);max-width:900px}.fkl-tag{display:inline-block;border-radius:999px;padding:4px 10px;background:#edf5ff;color:var(--fkl-blue2);font-size:11px;font-weight:900;text-transform:uppercase;letter-spacing:.08em}.fkl-complete{border:1px solid #cddbe8;background:#fff;padding:9px 12px;border-radius:12px;cursor:pointer;white-space:nowrap;font-weight:800;color:#47617a}.fkl-complete.done{background:#e8f8f2;border-color:#8fd8bd;color:#087353}.fkl-module-grid{display:grid;grid-template-columns:minmax(260px,.82fr) 1.55fr;gap:26px;margin-top:24px}.fkl-figure{background:#f7faff;border:1px solid #e5edf6;border-radius:17px;padding:12px;align-self:start}.fkl-figure img{width:100%;height:auto;max-height:340px;object-fit:contain;background:#fff;border:1px solid #edf1f5;border-radius:10px;display:block;margin:0 auto}.fkl-image-error{background:#fff4f4;border:1px solid #f1caca;color:#8a3434;border-radius:10px;padding:14px;font-size:13px;line-height:1.45}.fkl-image-error a{font-weight:800}.fkl-figure p{font-size:10px;line-height:1.4;color:#6d7886;margin:8px 4px 1px}.fkl-tabs{display:flex;gap:7px;flex-wrap:wrap;border-bottom:1px solid var(--fkl-border);padding-bottom:10px}.fkl-tabs button{border:0;background:#eef4fa;color:#49647e;padding:8px 11px;border-radius:10px;font-weight:800;cursor:pointer}.fkl-tabs button.active{background:var(--fkl-blue);color:#fff}.fkl-tabpane{display:none;padding:15px 2px 0}.fkl-tabpane.active{display:block}.fkl-tabpane ul{padding-left:22px;margin:0}.fkl-tabpane li{margin:8px 0}.fkl-formulas{display:grid;gap:9px}.fkl-formulas div{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;background:#f3f7fb;border-left:4px solid var(--fkl-yellow);padding:10px 12px;border-radius:8px}.fkl-clinical{background:#fff9dc;border:1px solid #f6df77;border-radius:14px;padding:16px}.fkl-clinical b{color:#715600}.fkl-clinical p{margin:5px 0 0}
.fkl-section-title{text-align:center;max-width:820px;margin:0 auto 28px}.fkl-section-title>span{color:var(--fkl-blue2)}.fkl-section-title h2{font-size:clamp(28px,4vw,44px);letter-spacing:-.03em;margin:8px 0}.fkl-section-title p{color:var(--fkl-muted);margin:0}.fkl-calcs,.fkl-quiz-section,.fkl-references{padding:55px clamp(18px,4vw,50px);background:#fff;border-top:1px solid var(--fkl-border)}.fkl-calc-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}.fkl-calc{border:1px solid var(--fkl-border);border-radius:18px;padding:19px;background:#f8fbfe}.fkl-calc h3{font-size:17px;margin:0 0 13px}.fkl-calc label{display:grid;grid-template-columns:1fr 90px;gap:8px;align-items:center;font-size:13px;margin:8px 0}.fkl-calc input{width:100%!important;border:1px solid #cad8e6!important;border-radius:9px!important;padding:7px!important;background:#fff!important}.fkl-calc button{width:100%;border:0;background:var(--fkl-blue);color:#fff;font-weight:800;border-radius:10px;padding:9px;cursor:pointer;margin-top:6px}.fkl-calc output{display:block;font-size:20px;font-weight:900;margin:14px 0 2px;color:var(--fkl-blue)}.fkl-calc small{color:var(--fkl-muted);font-size:11px}
.fkl-quiz-section{background:#071f3a;color:#fff}.fkl-quiz-section .fkl-section-title h2{color:#fff}.fkl-quiz-section .fkl-section-title p{color:#c7d9ea}.fkl-quiz-section .fkl-section-title>span{color:var(--fkl-yellow)}.fkl-quiz-box{max-width:820px;margin:auto;background:#0b3159;border:1px solid rgba(255,255,255,.12);border-radius:20px;padding:26px}.fkl-qmeta{display:flex;justify-content:space-between;font-size:12px;color:#bad1e6;margin-bottom:12px}.fkl-qtext{font-size:22px;font-weight:800;line-height:1.35;margin-bottom:16px}.fkl-options{display:grid;gap:9px}.fkl-option{border:1px solid rgba(255,255,255,.18);background:#0e3b69;color:#fff;text-align:left;border-radius:12px;padding:12px 14px;cursor:pointer;font-weight:700}.fkl-option:hover{background:#124a82}.fkl-option.correct{background:#0b704f;border-color:#40c595}.fkl-option.wrong{background:#8a2d39;border-color:#e8848e}.fkl-explain{margin-top:14px;background:rgba(255,255,255,.08);border-radius:12px;padding:13px;color:#e0edf8}.fkl-next{margin-top:14px;border:0;background:var(--fkl-yellow);color:#17324f;font-weight:900;border-radius:11px;padding:10px 14px;cursor:pointer}.fkl-score{text-align:center;padding:25px}.fkl-score strong{display:block;font-size:55px;color:var(--fkl-yellow)}
.fkl-references{background:#f7faff}.fkl-references>p,.fkl-references>ul,.fkl-disclaimer{max-width:900px;margin-left:auto;margin-right:auto}.fkl-references li{margin:8px 0}.fkl-disclaimer{margin-top:24px;background:#eef4fa;border-left:5px solid var(--fkl-blue2);padding:15px;border-radius:10px}.fkl-empty{grid-column:1/-1;text-align:center;padding:35px;color:var(--fkl-muted)}
@media(max-width:1000px){.fkl-hero{grid-template-columns:1fr}.fkl-hero-card{max-width:420px}.fkl-cards{grid-template-columns:repeat(2,1fr)}.fkl-module-grid{grid-template-columns:1fr}.fkl-figure img{height:auto;max-height:380px}.fkl-calc-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:620px){.fkl-app{border-radius:0;margin:0}.fkl-hero{padding:38px 20px}.fkl-hero h1{font-size:42px}.fkl-toolbar{position:static}.fkl-cards{grid-template-columns:1fr;padding:18px}.fkl-learning{padding:0 12px 25px}.fkl-module{padding:18px;border-radius:16px}.fkl-module-head{display:block}.fkl-complete{margin-top:13px}.fkl-module-grid{gap:16px}.fkl-figure img{height:auto;max-height:300px}.fkl-tabs{display:grid;grid-template-columns:1fr 1fr}.fkl-calc-grid{grid-template-columns:1fr}.fkl-qtext{font-size:18px}}

/* ===== v1.1 Interactive Physiology Lab ===== */
.fkl-labs{padding:58px clamp(18px,4vw,50px);background:linear-gradient(180deg,#eef6ff,#f8fbff);border-top:1px solid var(--fkl-border)}
.fkl-lab-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.fkl-lab-card{background:#fff;border:1px solid #d9e6f3;border-radius:22px;padding:22px;box-shadow:0 12px 35px rgba(7,59,117,.06);min-width:0}.fkl-lab-card.wide{grid-column:1/-1}.fkl-lab-card>p{color:var(--fkl-muted);margin:8px 0 18px}.fkl-lab-head{display:flex;align-items:center;gap:12px}.fkl-lab-head>span{display:grid;place-items:center;width:38px;height:38px;border-radius:12px;background:var(--fkl-yellow);font-weight:950;color:#17324f}.fkl-lab-head small{font-size:10px;letter-spacing:.1em;text-transform:uppercase;font-weight:900;color:var(--fkl-blue2)}.fkl-lab-head h3{font-size:21px;line-height:1.1;margin:2px 0 0}.fkl-controls{display:grid;gap:12px;margin-bottom:14px}.fkl-controls.two{grid-template-columns:1fr 1fr}.fkl-controls label,.fkl-time-slider{font-size:12px;font-weight:800;color:#3d5872}.fkl-controls label b,.fkl-time-slider b{float:right;color:var(--fkl-blue)}.fkl-controls input[type=range],.fkl-time-slider input[type=range]{display:block;width:100%;accent-color:var(--fkl-blue2);margin-top:7px}.fkl-chart{border:1px solid #e2ebf4;background:linear-gradient(#fbfdff,#f5f9fd);border-radius:16px;padding:8px;overflow:hidden}.fkl-chart svg{display:block;width:100%;height:auto;min-height:210px}.fkl-chart .axis{stroke:#9eb0c3;stroke-width:1.4}.fkl-chart .guide{stroke:#afbdca;stroke-width:1}.fkl-chart .dash{stroke-dasharray:5 5}.fkl-chart .trace{fill:none;stroke:var(--fkl-blue2);stroke-width:4;stroke-linecap:round;stroke-linejoin:round}.fkl-chart .trace.pv{fill:rgba(12,93,165,.1)}.fkl-chart .trace.aorta{stroke:#d83d52}.fkl-chart .trace.ventricle{stroke:#0c5da5}.fkl-chart .trace.atrium{stroke:#2a9d70}.fkl-chart .trace.spiro{stroke:#7847b8}.fkl-chart .trace.hb{stroke:#bd3249}.fkl-chart .cursor{stroke:#f09b1b;stroke-width:2.2;stroke-dasharray:5 4}.fkl-chart .dot{fill:var(--fkl-yellow);stroke:#8b6500;stroke-width:2}.svg-label,.legend{font-size:12px;fill:#587087;font-weight:700}.aorta-text{fill:#d83d52}.ventricle-text{fill:#0c5da5}.atrium-text{fill:#2a9d70}.fkl-lab-result{margin-top:12px;background:#edf6ff;border-left:4px solid var(--fkl-blue2);padding:11px 13px;border-radius:9px;font-size:13px}.fkl-lab-note{display:block;color:#68798a;margin-top:9px;line-height:1.5}.fkl-state-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-top:12px}.fkl-state-grid>div,.fkl-mini-metrics span{background:#f3f7fb;border:1px solid #e1eaf3;border-radius:11px;padding:10px}.fkl-state-grid small,.fkl-state-grid strong{display:block}.fkl-state-grid small{font-size:10px;text-transform:uppercase;color:#718091;font-weight:800}.fkl-state-grid strong{font-size:12px;line-height:1.35;margin-top:3px}.fkl-mini-metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:10px}.fkl-mini-metrics span{font-size:11px;color:#637587;text-align:center}.fkl-mini-metrics b{display:block;color:var(--fkl-blue);font-size:18px}.fkl-preset-row{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:12px}.fkl-preset{border:1px solid #cbd9e7;background:#f7faff;color:#36536d;border-radius:999px;padding:7px 12px;font-weight:800;cursor:pointer}.fkl-preset.active{background:var(--fkl-blue);color:#fff;border-color:var(--fkl-blue)}.fkl-shift-help{display:flex;justify-content:space-between;gap:12px;font-size:11px;color:#64778a;margin-top:8px}.fkl-input-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.fkl-input-grid label{font-size:11px;font-weight:800;color:#4d647a}.fkl-input-grid input{display:block;width:100%!important;margin-top:5px!important;border:1px solid #cad8e6!important;border-radius:10px!important;padding:9px!important;background:#fff!important}.fkl-lab-action{border:0;background:var(--fkl-blue);color:#fff;font-weight:850;border-radius:11px;padding:10px 15px;cursor:pointer;margin-top:12px}.fkl-clearance-meter{height:12px;background:#e6edf5;border-radius:999px;overflow:hidden;margin:15px 0 0}.fkl-clearance-meter>div{height:100%;width:50%;background:linear-gradient(90deg,#0c5da5,#ffd43b);transition:.25s}.fkl-abg-output{display:grid;grid-template-columns:1fr 1.4fr 1.6fr;gap:9px;margin-top:13px}.fkl-abg-output>div{background:#f5f8fb;border:1px solid #e0e9f2;border-radius:12px;padding:12px}.fkl-abg-output small,.fkl-abg-output b{display:block}.fkl-abg-output small{font-size:10px;text-transform:uppercase;letter-spacing:.06em;color:#718091;font-weight:850}.fkl-abg-output b{font-size:12px;line-height:1.45;margin-top:4px}
@media(max-width:850px){.fkl-lab-grid{grid-template-columns:1fr}.fkl-lab-card.wide{grid-column:auto}.fkl-state-grid{grid-template-columns:1fr 1fr}.fkl-abg-output{grid-template-columns:1fr}.fkl-input-grid{grid-template-columns:1fr 1fr}.fkl-controls.two{grid-template-columns:1fr}}
@media(max-width:520px){.fkl-state-grid,.fkl-input-grid,.fkl-mini-metrics{grid-template-columns:1fr}.fkl-shift-help{display:grid}.fkl-chart svg{min-height:170px}.fkl-lab-card{padding:17px}.fkl-lab-head h3{font-size:18px}}