:root{--navy:#06131f;--navy2:#0b1f2f;--card:#102638;--teal:#31d4c5;--purple:#8d78ff;--text:#f2f8fb;--muted:#aec2cd;--line:#244255}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,system-ui,-apple-system,"Segoe UI",sans-serif;background:linear-gradient(180deg,#06131f,#091a28);color:var(--text);line-height:1.65}a{text-decoration:none;color:inherit}.wrap{width:min(1120px,92%);margin:auto}
nav{position:sticky;top:0;z-index:20;background:rgba(6,19,31,.94);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}.nav{min-height:72px;display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{font-size:1.2rem;font-weight:850}.brand span{color:var(--teal)}.links{display:flex;gap:18px;flex-wrap:wrap;color:var(--muted);font-size:.92rem}.links a:hover{color:white}
.hero{padding:100px 0 78px;display:grid;grid-template-columns:1.2fr .8fr;gap:42px;align-items:center}.eyebrow{color:var(--teal);font-weight:800;text-transform:uppercase;letter-spacing:.1em;font-size:.78rem}.hero h1{font-size:clamp(3rem,7vw,5.8rem);line-height:.98;letter-spacing:-.05em;margin:16px 0 22px}.accent{color:var(--teal)}.lead{font-size:1.16rem;color:var(--muted);max-width:760px}.buttons{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}.btn{padding:12px 17px;border-radius:10px;font-weight:800;border:1px solid var(--line)}.primary{background:var(--teal);color:#03201e;border-color:var(--teal)}
.panel,.card,.article{background:linear-gradient(145deg,#102638,#0b1c2a);border:1px solid var(--line);border-radius:20px}.panel{padding:26px}.steps{display:grid;gap:9px;margin-top:18px}.step{padding:12px 14px;background:#091a27;border:1px solid #285064;border-radius:11px;display:flex;justify-content:space-between}.step b{color:var(--teal)}
section{padding:68px 0}.section-head{max-width:760px;margin-bottom:28px}.section-head h2{font-size:2.25rem;line-height:1.1;margin:0 0 10px}.section-head p,.card p,.article p{color:var(--muted)}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:17px}.card{padding:22px}.card .tag,.tag{font-size:.78rem;color:var(--purple);font-weight:850;letter-spacing:.08em;text-transform:uppercase}.card h3{margin:7px 0}
.feature{display:grid;grid-template-columns:1fr 1fr;gap:18px}.feature .panel h3{font-size:1.5rem;margin-top:0}.pills{display:flex;gap:9px;flex-wrap:wrap}.pill{padding:7px 11px;border:1px solid #2c5266;border-radius:999px;background:#091b28;color:#d4e7ef;font-size:.9rem}.quote{padding:20px;border-left:4px solid var(--teal);background:#091a27;border-radius:0 12px 12px 0;font-weight:750;margin-top:18px}
.article-grid{display:grid;grid-template-columns:2fr 1fr;gap:18px}.article{padding:26px}.article h3{font-size:1.65rem;margin:7px 0}.article a{color:var(--teal);font-weight:800}
.pagehero{padding:75px 0 40px}.pagehero h1{font-size:clamp(2.6rem,6vw,4.8rem);line-height:1;margin:10px 0 18px}.content{max-width:850px}.content h2{margin-top:38px}.notice{padding:18px;border:1px solid #315469;border-radius:14px;background:#0a1b28;color:var(--muted)}
footer{margin-top:50px;padding:45px 0;border-top:1px solid var(--line);color:var(--muted)}.foot{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}.small{font-size:.88rem}
@media(max-width:850px){.hero,.feature,.article-grid,.grid3{grid-template-columns:1fr}.links{display:none}}

.article-page{max-width:860px}.article-page h2{font-size:1.8rem;margin-top:44px;line-height:1.2}.article-page h3{margin-top:30px}.article-page p,.article-page li{color:var(--muted)}.article-page strong{color:var(--text)}.article-meta{display:flex;gap:12px;flex-wrap:wrap;color:var(--muted);font-size:.9rem;margin:14px 0 30px}.article-callout{padding:22px;margin:28px 0;background:#0b2030;border:1px solid #2b5267;border-radius:16px}.framework{display:grid;grid-template-columns:repeat(5,1fr);gap:10px;margin:24px 0}.framework div{padding:16px 10px;text-align:center;background:#091a27;border:1px solid #285064;border-radius:12px;font-weight:800;color:var(--teal)}.references{padding-left:22px}.references li{margin-bottom:14px}.references a{color:var(--teal);text-decoration:underline}.byline{border-top:1px solid var(--line);margin-top:45px;padding-top:24px}.article-page ul{padding-left:22px}@media(max-width:850px){.framework{grid-template-columns:1fr}}


.founder-profile{
  display:grid;
  grid-template-columns:minmax(220px,320px) 1fr;
  gap:30px;
  align-items:start;
  margin:18px 0 42px;
}
.founder-photo-wrap{
  border-radius:20px;
  overflow:hidden;
  border:1px solid var(--line);
  background:var(--card);
  box-shadow:0 18px 45px rgba(0,0,0,.22);
}
.founder-photo{
  display:block;
  width:100%;
  height:auto;
  aspect-ratio:4/5;
  object-fit:cover;
  object-position:center top;
}
.founder-copy h3{
  font-size:1.65rem;
  margin:0 0 4px;
  color:var(--teal);
}
@media(max-width:760px){
  .founder-profile{grid-template-columns:1fr}
  .founder-photo-wrap{max-width:340px}
}

/* Learn EP lesson system */
.lesson-shell{display:grid;grid-template-columns:250px minmax(0,1fr);gap:32px;align-items:start}
.lesson-side{position:sticky;top:92px;background:linear-gradient(145deg,#102638,#0b1c2a);border:1px solid var(--line);border-radius:18px;padding:18px}
.lesson-side h3{margin:0 0 12px;font-size:1rem;color:var(--teal)}
.lesson-side a{display:block;padding:10px 11px;border-radius:10px;color:var(--muted);font-size:.92rem;margin:3px 0}
.lesson-side a:hover,.lesson-side a.active{background:#0a2532;color:white;border:1px solid #2a5263}
.lesson-main{min-width:0}.lesson-main h1{font-size:clamp(2.5rem,5vw,4.6rem);line-height:1.03;margin:12px 0 18px}
.lesson-main h2{margin-top:42px;font-size:2rem}.lesson-main h3{margin-top:28px}
.lesson-meta{display:flex;gap:10px;flex-wrap:wrap;color:var(--muted);font-size:.86rem;margin-bottom:18px}
.lesson-meta span{border:1px solid var(--line);padding:6px 9px;border-radius:999px}
.lesson-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.diagram{background:#f8fbfc;color:#0a1830;border-radius:18px;padding:18px;border:1px solid #d7e5ea;overflow:hidden}
.diagram h3{color:#0a1830;margin-top:0}.diagram p{color:#48606b}.diagram svg{width:100%;height:auto;display:block}
.keybox{background:linear-gradient(145deg,#0b2c35,#0a202c);border:1px solid #27606a;border-radius:16px;padding:18px;margin:22px 0}
.keybox h3{margin-top:0;color:var(--teal)}
.lesson-nav{display:flex;justify-content:space-between;gap:14px;margin-top:46px;flex-wrap:wrap}
.lesson-nav a{border:1px solid var(--line);border-radius:12px;padding:12px 16px;font-weight:750}
.lesson-nav a.next{background:var(--teal);color:#04201d;border-color:var(--teal)}
.resource-list{display:grid;gap:12px}.resource-item{border:1px solid var(--line);border-radius:14px;padding:16px;background:#0b1b28}.resource-item b{color:white}.resource-item a{color:var(--teal)}
.term{display:grid;grid-template-columns:150px 1fr;gap:16px;padding:13px 0;border-bottom:1px solid var(--line)}.term:last-child{border-bottom:0}
@media(max-width:900px){.lesson-shell{grid-template-columns:1fr}.lesson-side{position:relative;top:auto}.lesson-grid{grid-template-columns:1fr}}
@media(max-width:600px){.term{grid-template-columns:1fr;gap:4px}}

/* V8 EGM lesson enhancements */
.quiz-card{background:linear-gradient(145deg,#102638,#0b1c2a);border:1px solid var(--line);border-radius:18px;padding:22px;margin:20px 0}
.quiz-card h3{margin-top:0}
.quiz-options{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:14px}
.quiz-option{appearance:none;border:1px solid #31566a;background:#0a1c29;color:var(--text);padding:14px;border-radius:12px;font-weight:750;cursor:pointer;text-align:left}
.quiz-option:hover{border-color:var(--teal)}
.quiz-feedback{margin-top:14px;padding:14px;border-radius:12px;background:#0a2630;border:1px solid #2b5966;display:none}
.quiz-feedback.show{display:block}
.signal-legend{display:flex;gap:12px;flex-wrap:wrap;margin:12px 0 0}.signal-legend span{font-size:.86rem;padding:6px 9px;border-radius:999px;border:1px solid #d5e3e8;background:#fff;color:#123}
.compare-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
@media(max-width:800px){.quiz-options,.compare-grid{grid-template-columns:1fr}}

/* V9 course enhancements */
.objective-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:18px 0}
.objective{background:#0a1c29;border:1px solid var(--line);border-radius:14px;padding:16px}
.objective b{display:block;color:var(--teal);margin-bottom:5px}
.lesson-callout{padding:18px;border-radius:15px;background:linear-gradient(145deg,#0e2934,#0b202b);border:1px solid #2e5968;margin:20px 0}
.lesson-callout strong{color:var(--teal)}
@media(max-width:800px){.objective-grid{grid-template-columns:1fr}}

.rhythm-flow{display:grid;grid-template-columns:repeat(5,1fr);gap:8px;margin:20px 0}
.rhythm-flow div{background:#0a1c29;border:1px solid var(--line);border-radius:12px;padding:12px;text-align:center;font-size:.88rem}
.rhythm-flow b{display:block;color:var(--teal)}
.rhythm-facts{display:grid;grid-template-columns:repeat(2,1fr);gap:15px}
@media(max-width:850px){.rhythm-flow,.rhythm-facts{grid-template-columns:1fr}}

.svt-compare{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin:22px 0}
.clue-table{width:100%;border-collapse:collapse;margin:18px 0;background:#0b1b28;border-radius:14px;overflow:hidden}
.clue-table th,.clue-table td{padding:13px 14px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
.clue-table th{color:var(--teal);background:#0d2431}.clue-table td:first-child{font-weight:700;color:white}
.visual-caption{font-size:.84rem;color:#48606b;margin-top:8px}
@media(max-width:800px){.svt-compare{grid-template-columns:1fr}}

.map-hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:22px;align-items:center}
.map-flow{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:20px 0}
.map-flow div{background:#0a1c29;border:1px solid var(--line);border-radius:14px;padding:15px;text-align:center}.map-flow b{display:block;color:var(--teal);font-size:1.15rem}
.system-table{width:100%;border-collapse:collapse;margin:18px 0;background:#0b1b28;border-radius:14px;overflow:hidden}
.system-table th,.system-table td{padding:13px;border-bottom:1px solid var(--line);vertical-align:top;text-align:left}.system-table th{color:var(--teal);background:#0d2431}
.tech-check{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.tech-check .card{margin:0}
@media(max-width:850px){.map-hero-grid,.map-flow,.tech-check{grid-template-columns:1fr}}

.scenario{background:linear-gradient(145deg,#102638,#0b1c2a);border:1px solid #31566a;border-radius:18px;padding:20px;margin:24px 0}
.scenario .label{font-size:.78rem;text-transform:uppercase;letter-spacing:.09em;color:var(--teal);font-weight:800}
.mapping-sidebar-note{font-size:.78rem;color:var(--muted);margin:12px 8px 0}
.lesson-diagram{background:#f8fbfc;color:#102638;border-radius:18px;padding:18px;border:1px solid #d7e5ea;margin:18px 0}
.lesson-diagram svg{width:100%;height:auto;display:block}

.device-flow{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:20px 0}
.device-flow div{background:#0a1c29;border:1px solid var(--line);border-radius:14px;padding:15px;text-align:center}
.device-flow b{display:block;color:var(--teal);font-size:1.08rem}
.device-strip{background:#f8fbfc;border:1px solid #d7e5ea;border-radius:18px;padding:18px;margin:18px 0;color:#102638}
.device-strip svg{width:100%;height:auto;display:block}
.device-sidebar-note{font-size:.78rem;color:var(--muted);margin:12px 8px 0}
@media(max-width:850px){.device-flow{grid-template-columns:1fr 1fr}}
@media(max-width:550px){.device-flow{grid-template-columns:1fr}}

/* V15 platform polish */
.mobile-toggle{display:none;background:transparent;border:1px solid var(--line);color:var(--text);padding:9px 12px;border-radius:10px;font-weight:800}
.mobile-menu{display:none;padding:0 0 16px}.mobile-menu a{display:block;padding:10px 0;color:var(--muted);border-bottom:1px solid var(--line)}
.mobile-menu.open{display:block}
.search-wrap{position:relative;min-width:250px}.search-input{width:100%;background:#0a1c29;border:1px solid var(--line);color:var(--text);border-radius:10px;padding:10px 12px}
.search-results{display:none;position:absolute;top:46px;right:0;width:min(430px,86vw);max-height:420px;overflow:auto;background:#071722;border:1px solid var(--line);border-radius:14px;box-shadow:0 18px 50px rgba(0,0,0,.3);padding:8px;z-index:50}
.search-results.show{display:block}.search-hit{display:block;padding:11px;border-radius:10px}.search-hit:hover{background:#102638}.search-hit b{display:block;color:white}.search-hit span{font-size:.82rem;color:var(--muted)}
.pathway{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.path-card{position:relative;background:linear-gradient(145deg,#102638,#0b1c2a);border:1px solid var(--line);border-radius:18px;padding:22px}.path-card .stepnum{font-size:.78rem;color:var(--teal);font-weight:900;letter-spacing:.08em}.path-card h3{margin:7px 0}.progress-wrap{margin-top:15px}.progress-bar{height:8px;background:#071722;border:1px solid var(--line);border-radius:999px;overflow:hidden}.progress-fill{height:100%;width:0;background:var(--teal);transition:.25s}.progress-text{font-size:.78rem;color:var(--muted);margin-top:6px}
.hero-metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:24px}.metric{background:#0a1c29;border:1px solid var(--line);border-radius:14px;padding:16px}.metric b{display:block;color:var(--teal);font-size:1.25rem}
.resource-filters{display:flex;gap:9px;flex-wrap:wrap;margin:18px 0}.filter-btn{border:1px solid var(--line);background:#0a1c29;color:var(--text);padding:8px 11px;border-radius:999px;cursor:pointer}.filter-btn.active{background:var(--teal);color:#04201d;border-color:var(--teal)}
.resource-card[data-hidden="true"]{display:none}
.course-progress-card{background:#0a1c29;border:1px solid var(--line);border-radius:14px;padding:14px;margin:18px 0}
.course-complete-btn{border:1px solid var(--teal);background:transparent;color:var(--teal);padding:9px 12px;border-radius:10px;font-weight:800;cursor:pointer}.course-complete-btn.done{background:var(--teal);color:#04201d}
.citation-list{padding-left:20px;color:var(--muted)}.citation-list li{margin:8px 0}
.footer-links{display:flex;gap:14px;flex-wrap:wrap}
@media(max-width:980px){.links,.search-wrap{display:none}.mobile-toggle{display:block}.pathway{grid-template-columns:1fr 1fr}.hero-metrics{grid-template-columns:1fr 1fr}}
@media(max-width:620px){.pathway,.hero-metrics{grid-template-columns:1fr}}

/* V16 EP Practice Lab */
.practice-hero{display:grid;grid-template-columns:1.15fr .85fr;gap:24px;align-items:center}
.practice-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:20px}
.practice-stat{background:#0a1c29;border:1px solid var(--line);border-radius:14px;padding:16px}
.practice-stat b{display:block;color:var(--teal);font-size:1.25rem}
.case-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.case-card{background:linear-gradient(145deg,#102638,#0b1c2a);border:1px solid var(--line);border-radius:18px;padding:20px;display:flex;flex-direction:column;min-height:240px}
.case-card .case-cat{font-size:.76rem;color:var(--purple);text-transform:uppercase;font-weight:850;letter-spacing:.08em}
.case-card h3{margin:8px 0}.case-card p{color:var(--muted);flex:1}.case-card a{color:var(--teal);font-weight:800}
.practice-shell{display:grid;grid-template-columns:250px minmax(0,1fr);gap:28px;align-items:start}
.practice-side{position:sticky;top:92px;background:linear-gradient(145deg,#102638,#0b1c2a);border:1px solid var(--line);border-radius:18px;padding:18px}
.practice-side a{display:block;padding:9px 10px;border-radius:10px;color:var(--muted);margin:3px 0}.practice-side a.active{background:#0a2630;color:#fff;border:1px solid #2b5966}
.case-visual{background:#f8fbfc;color:#102638;border-radius:18px;border:1px solid #d7e5ea;padding:18px;margin:18px 0;overflow:hidden}
.case-visual svg{width:100%;height:auto;display:block}
.answer-btn{display:block;width:100%;text-align:left;border:1px solid #31566a;background:#0a1c29;color:var(--text);padding:13px 14px;border-radius:12px;font-weight:750;cursor:pointer;margin:9px 0}
.answer-btn:hover{border-color:var(--teal)}
.answer-btn.correct{border-color:var(--teal);background:#0d302e}.answer-btn.wrong{border-color:#8a4a57;background:#281821}
.case-feedback{display:none;margin-top:14px;padding:15px;border-radius:12px;background:#0a2630;border:1px solid #2b5966}.case-feedback.show{display:block}
.case-score{display:flex;gap:10px;flex-wrap:wrap;margin:16px 0}.score-pill{padding:7px 10px;border-radius:999px;border:1px solid var(--line);background:#0a1c29;color:var(--muted);font-size:.86rem}
.lab-filter{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:20px}
.lab-filter button{border:1px solid var(--line);background:#0a1c29;color:var(--text);padding:8px 11px;border-radius:999px;cursor:pointer}
.lab-filter button.active{background:var(--teal);color:#04201d;border-color:var(--teal)}
.case-card[data-hidden="true"]{display:none}
@media(max-width:900px){.practice-hero,.practice-shell{grid-template-columns:1fr}.practice-side{position:relative;top:auto}.case-grid{grid-template-columns:1fr 1fr}}
@media(max-width:620px){.case-grid,.practice-stats{grid-template-columns:1fr}}

/* V17 Emerging Technology & Innovation hub */
.innovation-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.innovation-card{background:linear-gradient(145deg,#102638,#0b1c2a);border:1px solid var(--line);border-radius:18px;padding:22px}
.innovation-card .tag{margin-bottom:6px}
.innovation-card h3{margin:6px 0 8px}
.innovation-card p{color:var(--muted)}
.innovation-flow{display:grid;grid-template-columns:repeat(5,1fr);gap:10px;margin:20px 0}
.innovation-flow div{background:#0a1c29;border:1px solid var(--line);border-radius:14px;padding:14px;text-align:center}
.innovation-flow b{display:block;color:var(--teal);font-size:1.05rem}
.radar{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.radar .panel{height:100%}
.future-list{display:grid;gap:12px}
.future-item{border:1px solid var(--line);border-radius:14px;padding:15px;background:#0a1c29}
.future-item b{color:var(--teal)}
@media(max-width:900px){.innovation-grid{grid-template-columns:1fr 1fr}.innovation-flow{grid-template-columns:1fr 1fr}.radar{grid-template-columns:1fr}}
@media(max-width:620px){.innovation-grid,.innovation-flow{grid-template-columns:1fr}}

/* V18 What Is Electrophysiology */
.ep-team-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.team-card{background:linear-gradient(145deg,#102638,#0b1c2a);border:1px solid var(--line);border-radius:18px;padding:21px}
.team-card .role{font-size:.76rem;color:var(--teal);font-weight:900;letter-spacing:.08em;text-transform:uppercase}
.team-card h3{margin:7px 0}.team-card p{color:var(--muted)}
.lab-layout{background:#f8fbfc;border:1px solid #d7e5ea;border-radius:20px;padding:18px;margin:22px 0}
.lab-layout svg{width:100%;height:auto;display:block}
.case-flow{display:grid;grid-template-columns:repeat(6,1fr);gap:10px;margin:22px 0}
.case-flow .flow-step{background:#0a1c29;border:1px solid var(--line);border-radius:14px;padding:14px}
.case-flow .flow-step b{display:block;color:var(--teal);font-size:.8rem;margin-bottom:6px}
.ep-procedure-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.ep-procedure{border:1px solid var(--line);border-radius:16px;padding:18px;background:#0a1c29}
.ep-procedure h3{margin-top:0}
.tech-role-list{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.tech-role-list div{background:#0a1c29;border:1px solid var(--line);border-radius:12px;padding:13px}
.who-fit{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.who-fit .card{height:100%}
@media(max-width:980px){.case-flow{grid-template-columns:repeat(3,1fr)}.ep-team-grid,.ep-procedure-grid{grid-template-columns:1fr 1fr}.who-fit{grid-template-columns:1fr 1fr}}
@media(max-width:620px){.case-flow,.ep-team-grid,.ep-procedure-grid,.tech-role-list,.who-fit{grid-template-columns:1fr}}

/* V18.1 top navigation */
.links{gap:16px}.links a{white-space:nowrap}