:root{
  --navy:#123b5d;
  --navy-dark:#082f4e;
  --blue:#2f78ae;
  --teal:#41a7a1;
  --teal-dark:#247f7a;
  --purple:#7447b6;
  --pink:#ef3b70;
  --gold:#f0b849;
  --green:#4c9b68;
  --red:#b84545;
  --ink:#233746;
  --muted:#647786;
  --mist:#f4f9fc;
  --line:#dce8ef;
  --white:#fff;
  --shadow:0 18px 45px rgba(18,59,93,.13);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:Inter,"Segoe UI",Arial,sans-serif;background:linear-gradient(180deg,#eef7fb 0,#f8fbfd 35%,#fff 100%);color:var(--ink);min-height:100vh}
button,input{font:inherit}
button,a{touch-action:manipulation}
img{display:block;max-width:100%}
.skip-link{position:fixed;left:12px;top:-60px;background:var(--navy);color:#fff;padding:12px 16px;border-radius:10px;z-index:999;text-decoration:none;font-weight:900}.skip-link:focus{top:12px}
.course-header{height:86px;display:flex;align-items:center;gap:20px;padding:0 max(20px,3vw);background:#fff;border-bottom:1px solid var(--line);box-shadow:0 7px 24px rgba(18,59,93,.07);position:sticky;top:0;z-index:20}
.course-brand{width:190px;height:68px;display:flex;align-items:center;flex:0 0 auto}.course-brand img{width:100%;height:100%;object-fit:contain;object-position:left center}
.course-header-copy{min-width:0;display:grid;gap:2px;flex:1}.course-header-copy span{font-size:.74rem;font-weight:950;letter-spacing:.1em;text-transform:uppercase;color:var(--teal-dark)}.course-header-copy strong{color:var(--navy);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.course-exit{color:var(--navy);text-decoration:none;border:1px solid var(--line);border-radius:999px;padding:11px 16px;font-weight:900;background:#fff}.course-exit:hover{background:#eef7fb}
.course-shell{width:min(1320px,calc(100% - 30px));margin:28px auto 70px;display:grid;grid-template-columns:300px minmax(0,1fr);gap:24px;align-items:start}
.course-sidebar{position:sticky;top:112px;display:grid;gap:16px}
.progress-card,.coach-button{background:#fff;border:1px solid var(--line);border-radius:22px;box-shadow:0 10px 28px rgba(18,59,93,.08)}
.progress-card{display:flex;align-items:center;gap:14px;padding:17px}.progress-card strong{display:block;color:var(--navy)}.progress-card small{display:block;color:var(--muted);margin-top:4px}
.progress-ring{--progress:0deg;width:62px;height:62px;border-radius:50%;display:grid;place-items:center;background:conic-gradient(var(--teal) var(--progress),#e7f0f4 0);position:relative;flex:0 0 auto}.progress-ring:before{content:"";position:absolute;inset:7px;border-radius:50%;background:#fff}.progress-ring span{position:relative;font-size:.78rem;font-weight:950;color:var(--navy)}
.lesson-nav{display:grid;gap:8px;background:#fff;border:1px solid var(--line);border-radius:22px;padding:12px;box-shadow:0 10px 28px rgba(18,59,93,.08);max-height:54vh;overflow:auto}
.lesson-link{display:grid;grid-template-columns:34px 1fr auto;gap:10px;align-items:center;width:100%;border:0;background:transparent;border-radius:14px;padding:10px;text-align:left;color:#526a79;cursor:pointer}.lesson-link:hover{background:#f1f8fb}.lesson-link.active{background:#e8f7f7;color:var(--navy)}.lesson-link.complete{color:#315f4b}.lesson-link:disabled{cursor:not-allowed;opacity:.55}
.lesson-number{width:34px;height:34px;border-radius:11px;display:grid;place-items:center;background:#eaf2f7;color:var(--navy);font-weight:950}.lesson-link.active .lesson-number{background:var(--teal);color:#fff}.lesson-link.complete .lesson-number{background:#e2f4e8;color:#2f7c4c}.lesson-name{font-size:.86rem;font-weight:850;line-height:1.25}.lesson-check{font-size:.9rem;color:var(--green)}
.coach-button{display:flex;align-items:center;gap:13px;width:100%;padding:17px;border-color:#dcd5f1;text-align:left;cursor:pointer;color:var(--navy);background:linear-gradient(135deg,#fff,#f7f3ff)}.coach-button>span:first-child{width:42px;height:42px;border-radius:14px;display:grid;place-items:center;background:var(--purple);color:#fff;font-size:1.2rem}.coach-button strong,.coach-button small{display:block}.coach-button small{color:var(--muted);font-size:.78rem;margin-top:2px}
.course-stage{min-height:690px;background:#fff;border:1px solid var(--line);border-radius:30px;box-shadow:var(--shadow);overflow:hidden;outline:none}
.course-loading{min-height:680px;display:grid;place-items:center;color:var(--muted);font-weight:850}
.lesson{min-height:680px;display:flex;flex-direction:column}.lesson-inner{padding:clamp(24px,4vw,52px);flex:1}.lesson-topline{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:22px}.lesson-kicker{display:inline-flex;align-items:center;gap:8px;color:var(--teal-dark);font-size:.78rem;font-weight:950;letter-spacing:.08em;text-transform:uppercase}.lesson-kicker:before{content:"";width:8px;height:8px;border-radius:50%;background:var(--pink)}.lesson-time{color:var(--muted);font-size:.8rem;font-weight:800;background:#f2f7fa;border-radius:999px;padding:8px 11px}
.lesson h1,.lesson h2,.lesson h3{color:var(--navy);line-height:1.08}.lesson h1{font-size:clamp(2.25rem,5vw,4.4rem);letter-spacing:-.045em;margin:0 0 18px}.lesson h2{font-size:clamp(1.8rem,3vw,2.7rem);letter-spacing:-.035em;margin:0 0 15px}.lesson h3{margin:0 0 8px}.lesson p{line-height:1.65}.lesson .lead{font-size:clamp(1.04rem,1.7vw,1.25rem);color:var(--muted);max-width:760px;margin:0 0 24px}
.hero-lesson{display:grid;grid-template-columns:1.02fr .98fr;min-height:680px}.hero-copy{padding:clamp(30px,5vw,62px);display:flex;flex-direction:column;justify-content:center;background:linear-gradient(145deg,#fff,#f4fafc)}.hero-media{position:relative;min-height:520px;overflow:hidden;background:#e8f1f5}.hero-media img{width:100%;height:100%;object-fit:cover}.hero-media:after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 55%,rgba(8,47,78,.54))}.hero-caption{position:absolute;left:26px;right:26px;bottom:24px;color:#fff;z-index:2;background:rgba(8,47,78,.76);backdrop-filter:blur(9px);padding:16px 18px;border-radius:17px}.hero-caption strong{display:block;margin-bottom:3px}
.pill-row{display:flex;flex-wrap:wrap;gap:9px;margin:18px 0}.pill{padding:9px 12px;border-radius:999px;background:#e8f7f7;color:#1e706c;font-weight:900;font-size:.82rem}.pill.purple{background:#f1ebfa;color:#68419c}.pill.gold{background:#fff4d8;color:#815c13}.pill.pink{background:#ffeaf1;color:#a52e55}
.callout{border-radius:19px;padding:18px 20px;background:#eff8fb;border:1px solid #d3e9f0;line-height:1.55}.callout strong{color:var(--navy)}.callout.warning{background:#fff8e8;border-color:#ecdba9;color:#6c531d}.callout.safe{background:#eff9f2;border-color:#d4eadb;color:#365f45}.callout.purple{background:#f7f2fc;border-color:#e4d9f2;color:#594079}
.icon-list{display:grid;gap:12px;margin:22px 0}.icon-item{display:flex;gap:12px;align-items:flex-start}.icon-item>span{width:34px;height:34px;border-radius:12px;display:grid;place-items:center;background:#e7f7f7;color:var(--teal-dark);font-weight:950;flex:0 0 auto}.icon-item b{display:block;color:var(--navy);margin-bottom:3px}.icon-item p{margin:0;color:var(--muted)}
.flip-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin-top:26px}.flip-card{min-height:210px;perspective:1000px}.flip-button{position:relative;width:100%;height:100%;min-height:210px;border:0;background:transparent;padding:0;cursor:pointer;text-align:left}.flip-inner{position:absolute;inset:0;transition:transform .55s;transform-style:preserve-3d}.flip-button[aria-pressed="true"] .flip-inner{transform:rotateY(180deg)}.flip-face{position:absolute;inset:0;backface-visibility:hidden;border-radius:21px;border:1px solid var(--line);box-shadow:0 10px 24px rgba(18,59,93,.08);padding:22px;display:flex;flex-direction:column;justify-content:space-between}.flip-front{background:linear-gradient(145deg,#fff,#f2fafb)}.flip-back{background:linear-gradient(145deg,var(--navy),#245f8d);color:#fff;transform:rotateY(180deg)}.flip-icon{width:48px;height:48px;border-radius:16px;display:grid;place-items:center;background:#e4f5f5;color:var(--teal-dark);font-size:1.35rem}.flip-face h3{margin:16px 0 5px}.flip-back h3{color:#fff}.flip-hint{font-size:.76rem;color:var(--muted);font-weight:850}.flip-back .flip-hint{color:rgba(255,255,255,.72)}
.image-reveal{display:grid;grid-template-columns:1.06fr .94fr;gap:26px;align-items:stretch;margin-top:26px}.image-panel{position:relative;overflow:hidden;border-radius:24px;min-height:430px;border:1px solid var(--line);background:#eaf3f6}.image-panel img{width:100%;height:100%;object-fit:cover}.image-overlay-button{position:absolute;inset:0;border:0;background:linear-gradient(180deg,transparent 45%,rgba(8,47,78,.86));color:#fff;display:flex;align-items:flex-end;justify-content:flex-start;padding:26px;text-align:left;cursor:pointer}.image-overlay-button strong{display:block;font-size:1.2rem}.image-overlay-button small{display:block;margin-top:5px;color:rgba(255,255,255,.82)}.image-panel.revealed .image-overlay-button{background:linear-gradient(180deg,rgba(8,47,78,.08),rgba(8,47,78,.55))}.reveal-notes{display:grid;gap:12px}.reveal-note{border:1px solid var(--line);border-radius:17px;padding:16px;background:#fff;opacity:.38;transform:translateY(8px);transition:.3s}.image-panel.revealed+.reveal-notes .reveal-note{opacity:1;transform:none}.reveal-note b{display:block;color:var(--navy);margin-bottom:4px}.reveal-note p{margin:0;color:var(--muted);font-size:.93rem}
.timeline{display:grid;gap:13px;margin-top:25px}.timeline-step{display:grid;grid-template-columns:48px 1fr;gap:15px;padding:17px;border:1px solid var(--line);border-radius:18px;background:#fff}.timeline-step .step-num{width:48px;height:48px;border-radius:16px;background:var(--navy);color:#fff;display:grid;place-items:center;font-weight:950}.timeline-step b{display:block;color:var(--navy);margin-bottom:4px}.timeline-step p{margin:0;color:var(--muted)}
.boundary-grid,.fact-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px;margin-top:24px}.boundary-card,.fact-card{border:1px solid var(--line);border-radius:19px;padding:19px;background:#fff}.boundary-card.good{border-left:6px solid var(--green)}.boundary-card.stop{border-left:6px solid var(--red)}.boundary-card b,.fact-card b{display:block;color:var(--navy);margin-bottom:5px}.boundary-card p,.fact-card p{margin:0;color:var(--muted)}
.scenario-box{margin-top:24px;border-radius:24px;border:1px solid #dfe8f5;background:linear-gradient(145deg,#f7f9ff,#fff);padding:clamp(20px,3vw,30px)}.scenario-label{font-size:.78rem;font-weight:950;letter-spacing:.09em;color:var(--purple)}.scenario-box h3{font-size:1.4rem;margin:10px 0 8px}.scenario-options{display:grid;gap:11px;margin-top:19px}.scenario-option{width:100%;border:1px solid var(--line);border-radius:15px;background:#fff;padding:15px 17px;text-align:left;cursor:pointer;font-weight:800;color:#3d5665}.scenario-option:hover{border-color:#9cbfd2;background:#f7fbfd}.scenario-option.selected.correct{border-color:#78bc8e;background:#eef9f1;color:#2f6741}.scenario-option.selected.incorrect{border-color:#d98989;background:#fff0f0;color:#833838}.scenario-feedback{display:none;margin-top:15px;border-radius:15px;padding:14px 16px;line-height:1.55}.scenario-feedback.show{display:block}.scenario-feedback.correct{background:#eef9f1;color:#2f6741}.scenario-feedback.incorrect{background:#fff0f0;color:#833838}
.decision-list{display:grid;gap:13px;margin-top:24px}.decision-row{display:grid;grid-template-columns:1fr auto auto;gap:10px;align-items:center;border:1px solid var(--line);border-radius:17px;padding:14px 15px;background:#fff}.decision-row p{margin:0;font-weight:750}.decision-choice{border:1px solid var(--line);background:#f8fbfd;border-radius:12px;padding:9px 11px;font-weight:900;cursor:pointer}.decision-choice[data-choice="yes"]{color:#2f7047}.decision-choice[data-choice="no"]{color:#8a3939}.decision-row.correct{border-color:#83c497;background:#f2faf4}.decision-row.incorrect{border-color:#d88b8b;background:#fff3f3}
.quiz-intro{display:flex;gap:18px;align-items:flex-start;margin:24px 0;padding:18px;border-radius:20px;background:#eff7fb;border:1px solid #d7e8f0}.quiz-score-icon{width:56px;height:56px;border-radius:18px;background:var(--navy);color:#fff;display:grid;place-items:center;font-weight:950;flex:0 0 auto}.quiz-intro p{margin:4px 0 0;color:var(--muted)}
.quiz-form{display:grid;gap:18px}.quiz-question{border:1px solid var(--line);border-radius:20px;padding:20px;background:#fff}.quiz-question.correct{border-color:#7fbd92;background:#f4fbf6}.quiz-question.incorrect{border-color:#d88f8f;background:#fff5f5}.quiz-question legend{font-weight:900;color:var(--navy);padding:0 5px;line-height:1.45}.quiz-options{display:grid;gap:9px;margin-top:13px}.quiz-option{display:flex;gap:10px;align-items:flex-start;border:1px solid #dfe8ed;border-radius:14px;padding:12px 13px;cursor:pointer;background:#fff}.quiz-option:hover{background:#f7fbfd}.quiz-option input{margin-top:3px;accent-color:var(--teal)}.question-feedback{display:none;margin-top:11px;font-size:.9rem;font-weight:750}.quiz-question.correct .question-feedback,.quiz-question.incorrect .question-feedback{display:block}.quiz-question.correct .question-feedback{color:#2f7047}.quiz-question.incorrect .question-feedback{color:#8a3939}
.quiz-result{display:none;margin-top:20px;border-radius:20px;padding:20px}.quiz-result.show{display:block}.quiz-result.pass{background:#edf9f1;border:1px solid #cfe8d7;color:#2f6741}.quiz-result.fail{background:#fff2f2;border:1px solid #efd2d2;color:#853c3c}.quiz-result h3{margin:0 0 5px;color:inherit}.quiz-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px}
.certificate-panel{margin-top:22px;border-radius:24px;padding:24px;border:2px solid #d7e9ef;background:linear-gradient(145deg,#fff,#f4fafc);display:none}.certificate-panel.show{display:block}.certificate-panel label{display:block;font-weight:900;color:var(--navy);margin-bottom:7px}.certificate-panel input{width:100%;border:1px solid #cbdde5;border-radius:14px;padding:13px 14px;background:#fff}.certificate-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px}.certificate-preview{margin-top:20px;border:7px double #d0e5ea;border-radius:18px;padding:28px;text-align:center;background:#fff;display:none}.certificate-preview.show{display:block}.certificate-preview img{width:180px;height:70px;object-fit:contain;margin:0 auto 10px}.certificate-preview .cert-name{font-size:1.65rem;color:var(--navy);font-weight:950;margin:13px 0}.certificate-preview small{color:var(--muted)}
.source-list{display:grid;gap:10px;margin-top:24px}.source-link{display:block;border:1px solid var(--line);border-radius:15px;padding:14px 15px;text-decoration:none;color:var(--navy);font-weight:850;background:#fff}.source-link:hover{background:#f2f8fb}
.lesson-footer{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:18px clamp(24px,4vw,52px);border-top:1px solid var(--line);background:#fbfdfe}.lesson-footer .footer-status{font-size:.82rem;color:var(--muted);font-weight:800}.nav-actions{display:flex;gap:10px}.course-btn{border:0;border-radius:14px;padding:12px 18px;font-weight:950;cursor:pointer}.course-btn.primary{background:linear-gradient(135deg,var(--teal),#2f8e89);color:#fff;box-shadow:0 10px 22px rgba(65,167,161,.22)}.course-btn.secondary{background:#eef4f7;color:var(--navy)}.course-btn.ghost{background:#fff;border:1px solid var(--line);color:var(--navy)}.course-btn:disabled{opacity:.45;cursor:not-allowed;box-shadow:none}
.coach-dialog{width:min(520px,calc(100% - 28px));border:0;border-radius:25px;padding:28px;box-shadow:0 30px 90px rgba(8,47,78,.28);color:var(--ink)}.coach-dialog::backdrop{background:rgba(8,47,78,.45);backdrop-filter:blur(4px)}.dialog-close{position:absolute;right:15px;top:12px;border:0;background:transparent;font-size:1.8rem;color:var(--muted);cursor:pointer}.dialog-kicker{color:var(--purple);font-size:.76rem;font-weight:950;letter-spacing:.1em}.coach-dialog h2{color:var(--navy);margin:10px 0}.coach-dialog p{line-height:1.6}.coach-prompt{border-radius:16px;background:#f3eefb;color:#594079;padding:15px;margin-top:14px;font-weight:800}
.toast{position:fixed;right:20px;bottom:20px;max-width:360px;background:var(--navy-dark);color:#fff;padding:14px 17px;border-radius:14px;box-shadow:var(--shadow);opacity:0;transform:translateY(12px);transition:.25s;pointer-events:none;z-index:100}.toast.show{opacity:1;transform:none}
.error-card{min-height:680px;display:grid;place-items:center;text-align:center;padding:35px}.error-card h1{font-size:2rem}.error-card a{display:inline-block;margin-top:13px;text-decoration:none}
.confetti{position:fixed;inset:0;pointer-events:none;overflow:hidden;z-index:90}.confetti span{position:absolute;top:-25px;font-size:1.2rem;animation:fall 2.6s linear forwards}@keyframes fall{to{transform:translateY(110vh) rotate(600deg);opacity:.2}}
@media(max-width:980px){
  .course-shell{grid-template-columns:1fr}.course-sidebar{position:static}.lesson-nav{display:flex;overflow-x:auto;max-height:none}.lesson-link{min-width:220px}.coach-button{display:none}.progress-card{max-width:340px}.hero-lesson,.image-reveal{grid-template-columns:1fr}.hero-media{min-height:360px}.flip-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(max-width:640px){
  .course-header{height:74px;padding:0 14px;gap:10px}.course-brand{width:118px;height:52px}.course-header-copy span{font-size:.64rem}.course-header-copy strong{font-size:.83rem}.course-exit{padding:9px 11px;font-size:.76rem}.course-shell{width:min(100% - 16px,1320px);margin-top:12px;gap:12px}.progress-card{padding:12px}.progress-ring{width:52px;height:52px}.lesson-link{min-width:190px}.course-stage{border-radius:22px}.lesson,.course-loading,.error-card{min-height:620px}.lesson-inner{padding:24px 19px}.lesson-topline{align-items:flex-start}.hero-lesson{min-height:620px}.hero-copy{padding:32px 21px}.hero-media{min-height:300px}.hero-caption{left:15px;right:15px;bottom:15px}.flip-grid,.boundary-grid,.fact-grid{grid-template-columns:1fr}.flip-card,.flip-button{min-height:190px}.image-panel{min-height:330px}.decision-row{grid-template-columns:1fr 1fr}.decision-row p{grid-column:1/-1}.lesson-footer{padding:14px 16px;align-items:flex-start}.footer-status{display:none}.course-btn{padding:11px 14px}.quiz-question{padding:17px}.quiz-option{padding:11px}.certificate-preview{padding:19px}.toast{left:12px;right:12px;bottom:12px;max-width:none}
}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;animation-duration:.001ms!important;transition-duration:.001ms!important}}
@media print{
  body{background:#fff}.course-header,.course-sidebar,.lesson> :not(.lesson-inner),.lesson-inner> :not(.certificate-panel),.certificate-panel> :not(.certificate-preview),.toast,.coach-dialog{display:none!important}.course-shell{display:block;width:100%;margin:0}.course-stage{box-shadow:none;border:0}.certificate-panel,.certificate-preview{display:block!important;border:0}.certificate-preview{border:7px double #9fbfc9!important;margin:0;min-height:90vh;display:flex!important;flex-direction:column;justify-content:center}.certificate-actions{display:none!important}
}