:root{--ink:#192b29;--muted:#69736f;--teal:#087f76;--teal-dark:#15514a;--teal-pale:#e7f1ea;--paper:#f6f5f0;--white:#fff;--line:#dfE3dc;--gold:#c39949;--pink:#e9c5b8;--radius:18px;--sidebar:254px;--shadow:0 15px 50px #233e3510}
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li{counter-increment:flow;position:relative;background:#f1f5ed;border:1px solid #e0e7d9;border-radius:12px;padding:19px;margin:0}.flow-steps li::before{content:counter(flow,decimal-leading-zero);font-size:10px;color:var(--teal);font-weight:650;display:block;margin-bottom:21px}.flow-steps strong{display:block;font-size:14px;margin-bottom:7px}.flow-steps p{font-size:11px;line-height:1.6;color:var(--muted);margin:0}.material-visuals{display:grid;grid-template-columns:repeat(3,1fr);gap:17px}.material-visual{text-align:center;border:1px solid var(--line);padding:25px 18px;border-radius:15px;background:#fafbf8}.material-visual>span{display:block;width:60px;height:60px;background:radial-gradient(circle at 33% 30%,#d3dbdc,#76868b 72%);border-radius:50% 40% 46% 38%;margin:2px auto 22px;box-shadow:inset 0 1px 4px #ffffffcc,0 8px 13px #87937e24;border:1px solid #758484}.material-visual.gic>span{background:radial-gradient(circle at 33% 30%,#f8f4e8,#d3ceb5);border-color:#d1cbb4}.material-visual.composite>span{background:radial-gradient(circle at 33% 30%,#fffdf5,#dfd4b7);border-color:#d6c8a2}.material-visual h3{font-size:17px;margin-bottom:8px}.material-visual p{font-size:11px;margin:0;color:var(--muted)}.equipment-steps{display:grid;grid-template-columns:repeat(3,1fr);gap:15px}.equipment-step{padding:21px;background:#f2f5ed;border:1px solid #dfe6d6;border-radius:13px}.equipment-step .icon{width:29px;height:29px;color:var(--teal);margin-bottom:17px}.equipment-step h3{font-size:16px}.equipment-step p{font-size:12px;color:var(--muted);margin:0}
.video-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.video-card{min-width:0;background:white;border:1px solid var(--line);border-radius:13px;overflow:hidden}.video-thumbnail{display:block;width:100%;padding:0;position:relative;aspect-ratio:16/9;background:#dfe7df;overflow:hidden;text-align:left}.video-thumbnail img{display:block;width:100%;height:100%;object-fit:cover;transition:transform .35s;position:relative;z-index:1}.video-thumbnail:hover img{transform:scale(1.035)}.video-thumbnail::after{content:"";position:absolute;inset:0;background:linear-gradient(0deg,#13282435,transparent 65%);z-index:2}.video-fallback{position:absolute;inset:0;padding:20px;display:flex;align-items:flex-end;font-size:12px;line-height:1.5;color:#436251;background:linear-gradient(135deg,#e6eedf,#cddace)}.video-play{position:absolute;z-index:3;left:50%;top:50%;transform:translate(-50%,-50%);width:43px;height:43px;border-radius:50%;background:#fffffff0;display:grid;place-items:center;color:#184c3f;box-shadow:0 2px 12px #13282425}.video-play .icon{width:19px;height:19px;fill:currentColor;stroke-width:0;margin-left:2px}.video-duration{position:absolute;right:9px;bottom:9px;color:white;background:#111d17c9;font-size:10px;padding:1px 6px;border-radius:4px;z-index:3}.video-card-body{padding:17px 17px 15px}.video-card-body .eyebrow{font-size:8px;letter-spacing:.12em;margin-bottom:8px}.video-title{font-size:14px;font-weight:650;line-height:1.45;text-align:left;background:none;padding:0;margin-bottom:8px}.video-title:hover{color:var(--teal)}.video-card-body p{font-size:11px;line-height:1.6;color:var(--muted);margin-bottom:13px}.video-card-footer{display:flex;align-items:center;justify-content:space-between;gap:10px}.video-card-footer a{font-size:10px;color:var(--teal);text-decoration:none;font-weight:600}.video-card-footer a:hover{text-decoration:underline}.video-card-footer button{font-size:10px;color:var(--teal);background:none;padding:0;font-weight:650}.video-library-intro{display:flex;justify-content:space-between;gap:30px;align-items:flex-end}.video-library-intro p{max-width:650px;color:var(--muted);font-size:14px}.filter-bar{display:flex;align-items:center;justify-content:space-between;gap:15px;flex-wrap:wrap;margin:25px 0 27px}.video-count{font-size:11px;color:var(--muted)}.resource-note{font-size:11px;color:var(--muted);padding:17px 20px;background:#eeefe8;border-radius:10px;margin:26px 0}.video-dialog{padding:0;background:#f8f8f3;border:1px solid #dae1d4;border-radius:17px;width:min(970px,94vw);max-height:94dvh;color:var(--ink);box-shadow:0 30px 110px #051a1660}.video-dialog::backdrop,.search-dialog::backdrop{background:#12271ed1;backdrop-filter:blur(5px)}.dialog-heading{padding:22px 25px;display:flex;align-items:center;justify-content:space-between;gap:20px}.dialog-heading h2{font-size:21px;margin:0;line-height:1.3}.dialog-heading .eyebrow{font-size:9px;margin:0 0 6px}.video-player{aspect-ratio:16/9;min-height:200px;width:100%;background:#112018}.video-player iframe{width:100%;height:100%;border:0;display:block}.video-dialog-bottom{display:flex;justify-content:space-between;gap:25px;align-items:center;padding:21px 25px 13px}.video-dialog-bottom p{font-size:12px;color:var(--muted);margin:0;max-width:630px}.video-dialog-bottom>a{white-space:nowrap;font-size:11px;padding:12px 16px}.video-help{font-size:10px;color:var(--muted);padding:0 25px 20px;margin:0}.search-dialog{border:1px solid var(--line);padding:0;border-radius:15px;width:min(650px,94vw);max-height:84dvh;background:#fbfbf7;color:var(--ink)}.search-dialog .dialog-heading{padding-bottom:15px}.search-input-wrap{margin:0 23px 17px;display:flex;gap:12px;align-items:center;border:1px solid #a7c2ae;border-radius:9px;background:white;padding:11px 13px;color:var(--teal)}.search-input-wrap input{background:transparent;border:0;outline:none;width:100%;font-size:14px;min-width:0}.search-results{overflow-y:auto;max-height:53dvh;padding:0 22px 22px}.search-result{display:block;padding:15px 14px;border:1px solid var(--line);background:white;border-radius:9px;text-decoration:none;margin:9px 0}.search-result:hover{border-color:var(--teal);background:#f5f9f2}.search-result strong{font-size:14px;display:block;margin-bottom:5px}.search-result small{font-size:11px;display:block;color:var(--muted)}.empty-state{padding:35px 15px;color:var(--muted);font-size:13px;text-align:center}
.timeline{position:relative;padding:0;margin:30px 0;list-style:none}.timeline::before{content:"";position:absolute;left:24px;top:15px;bottom:20px;width:1px;background:#c7d9c9}.timeline-item{position:relative;margin:0 0 19px;padding-left:66px}.timeline-dot{position:absolute;top:21px;left:10px;width:29px;height:29px;border:5px solid var(--paper);border-radius:50%;background:#74a58c;box-shadow:0 0 0 1px #a5c2ad}.timeline-card{background:white;border:1px solid var(--line);border-radius:13px;padding:24px 27px}.timeline-card h2{font-size:21px;margin:0 0 10px}.timeline-card>p{font-size:13px;color:var(--muted)}.timeline-card li{font-size:12px;color:#52705e}.timeline-ready{border-top:1px solid #e5eade;padding-top:14px;font-size:12px;color:#5c755f}.timeline-links{display:flex;gap:8px;flex-wrap:wrap;margin-top:15px}.timeline-links a{color:var(--teal);font-size:10px;padding:5px 9px;border:1px solid #cddcca;background:#f7faf5;border-radius:6px;text-decoration:none}.timeline-links a:hover{border-color:var(--teal)}.noscript-message{position:fixed;bottom:20px;left:20px;right:20px;z-index:90;background:white;border:1px solid var(--line);padding:20px}
@media(min-width:1500px){#main-content{padding-left:65px;padding-right:65px}.home-hero{gap:60px}.hero-visual{min-height:395px}.hero-tooth>svg{height:230px;width:230px}}
@media(max-width:1150px){:root{--sidebar:230px}.sidebar{padding-left:15px;padding-right:15px}#main-content{padding:34px 30px 10px}.topbar{padding-left:30px;padding-right:30px}.module-grid{grid-template-columns:1fr 1fr}.hero-visual{padding:22px;min-height:330px}.hero-copy h1{font-size:46px}.home-hero{gap:25px}.quick-strip-item{padding:0 17px;gap:10px}.quick-strip-item>.icon{width:21px}.quick-strip-item small{font-size:9px}.explorer-grid{gap:20px}.video-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.breadcrumb{display:none}.flow-steps{grid-template-columns:1fr 1fr}.mouth-chart{gap:22px 14px}.tooth-button{min-height:70px}.tooth-button>svg{height:36px}.main-footer{margin-left:30px;margin-right:30px}}
@media(max-width:900px){:root{--sidebar:245px}.sidebar{transform:translateX(-100%);transition:transform .2s}.app-shell{margin-left:0}.mobile-menu{display:inline-flex}.sidebar-open .sidebar{transform:translateX(0)}.sidebar-open .sidebar-shade{display:block;position:fixed;inset:0;background:#0f211991;z-index:35}.topbar{padding:10px 20px;min-height:65px}.topbar-start{gap:10px}.topbar-title{font-size:12px}.topbar-actions{gap:5px}.home-hero{min-height:360px}.home-hero .hero-copy h1{font-size:50px}.hero-visual{min-height:348px}.quick-strip{margin-bottom:35px}#main-content{padding-top:32px}.diagram-stage{min-height:300px}}
@media(max-width:600px){body{font-size:14px;line-height:1.65}.topbar{padding:8px 13px}.topbar-title{font-size:11px}.topbar-actions .text-button{padding:8px}.topbar-actions .text-button>span:not([data-icon]){display:none}.download-button{font-size:10px;padding:9px 10px;gap:6px}.download-button .icon{width:15px}.topbar-actions .icon{width:17px}#main-content{padding:28px 20px 5px}.home-hero{grid-template-columns:1fr;gap:25px;margin-bottom:25px}.home-hero .hero-copy h1{font-size:43px;max-width:400px}.hero-copy p{font-size:14px;max-width:420px}.hero-visual{min-height:285px;padding:20px}.hero-tooth>svg{height:164px;width:164px}.hero-visual::before{height:230px;width:230px;top:31px}.hero-visual::after{height:170px;width:170px;top:61px}.hero-label strong{font-size:26px}.hero-float{bottom:10px;left:8px;font-size:9px}.hero-label{padding-top:11px}.hero-label span{font-size:10px}.hero-note{font-size:10px}.hero-actions .button{font-size:12px;padding:13px 15px}.quick-strip{grid-template-columns:1fr;padding:0 19px;margin-bottom:32px}.quick-strip-item{padding:14px 0;border-right:0;border-bottom:1px solid var(--line);gap:14px}.quick-strip-item strong{font-size:11px}.quick-strip-item small{margin-top:2px;font-size:10px}.quick-strip-item>.icon{height:21px;width:21px}.section-heading{margin:32px 0 17px;gap:12px}.section-heading h2{font-size:23px}.section-heading>a{font-size:10px}.module-grid{gap:11px}.module-card{padding:17px 15px;min-height:208px}.module-card .module-icon{height:34px;width:34px;padding:8px;margin-bottom:17px}.module-card h3{font-size:15px}.module-card p{font-size:10px}.module-card .module-bottom{font-size:9px}.home-callout{grid-template-columns:1fr;padding:27px;gap:24px;margin:33px 0}.home-callout .button{justify-self:start}.home-callout h2{font-size:29px}.video-grid{grid-template-columns:1fr;gap:20px}.video-card-body{padding:17px 19px}.video-title{font-size:16px}.video-card-body p{font-size:12px}.video-card-body .eyebrow{font-size:9px}.video-card-footer a,.video-card-footer button{font-size:11px}.lesson-heading h1{font-size:35px}.lesson-heading .intro{font-size:14px}.lesson-heading{margin-bottom:24px}.objectives{padding:19px;margin-top:23px}.objectives ul{display:block}.objectives li{margin:7px 0;font-size:11px}.visual-panel{padding:20px 15px;border-radius:15px;margin:23px 0 20px}.visual-panel-header{gap:10px;flex-wrap:wrap;margin-bottom:17px}.visual-panel-header h2{font-size:21px}.visual-panel-header p{font-size:11px}.mouth-chart{grid-template-columns:1fr;gap:21px;padding:16px 0 20px}.tooth-button{min-height:75px;padding-top:7px}.tooth-button>svg{height:40px;width:100%}.tooth-button span{font-size:11px}.tooth-row{gap:1px}.quadrant legend{font-size:10px;padding-bottom:6px}.quadrant legend strong{font-size:11px}.tooth-info{grid-template-columns:71px 1fr;padding:17px;gap:14px}.tooth-info>strong{font-size:35px;padding-right:11px}.tooth-info h3{font-size:16px}.tooth-info p{font-size:11px}.pill-row{gap:6px}.pill{padding:7px 11px;font-size:10px;min-height:36px}.chart-practice{gap:12px;padding-top:17px}.chart-practice .button{font-size:11px;padding:11px 14px}.explorer-grid{grid-template-columns:1fr;gap:22px}.diagram-stage{min-height:270px;padding:7px}.diagram-stage>svg{max-height:380px}.term-buttons{margin:0 0 17px}.term-button{font-size:11px;padding:9px 12px}.term-readout{min-height:120px}.lesson-section summary{padding:18px;font-size:15px}.section-body{padding:19px;font-size:13px}.section-body table{min-width:440px;font-size:11px}th,td{padding:11px 13px}.lesson-tools{margin-top:20px}.practice-box{padding:22px}.practice-box h2{font-size:20px}.practice-box>p{font-size:13px}.lesson-end{align-items:stretch;flex-direction:column}.lesson-end-nav{justify-content:space-between}.read-button{justify-content:center}.source-link{padding:13px 15px}.source-link strong{font-size:11px}.source-link small{font-size:9px}.main-footer{margin:38px 20px 0}.video-dialog{width:96vw;border-radius:12px}.dialog-heading{padding:18px}.dialog-heading h2{font-size:17px}.video-dialog-bottom{padding:18px;display:block}.video-dialog-bottom p{margin-bottom:15px;font-size:11px}.video-help{padding:0 18px 18px}.search-dialog .dialog-heading{padding:18px}.search-input-wrap{margin:0 18px 14px}.search-input-wrap input{font-size:12px}.search-results{padding:0 17px 18px}.selected-entry{padding:21px 16px;gap:16px;align-items:center}.selected-entry .entry-drawing{width:88px}.entry-drawing>svg{height:88px;width:88px}.entry-drawing .condition-mark{left:31px;top:30px;width:26px;height:21px}.entry-drawing .condition-mark.crown{left:13px;top:14px;width:61px;height:60px}.entry-drawing .condition-mark.extraction{left:13px;top:15px;width:60px;height:60px;font-size:60px}.selected-entry h3{font-size:24px}.selected-entry p{font-size:11px}.chart-status{grid-template-columns:1fr;gap:8px}.status-card{padding:16px}.status-card h3{display:inline-block;margin:0 11px 6px 0;font-size:15px}.status-card>span{display:block;margin-bottom:6px;font-size:8px}.status-card p{font-size:11px}.flow-steps{gap:10px}.flow-steps li{padding:16px}.flow-steps li::before{margin-bottom:12px}.flow-steps strong{font-size:13px}.flow-steps p{font-size:11px}.material-visuals{gap:9px}.material-visual{padding:17px 9px}.material-visual>span{width:45px;height:45px;margin-bottom:18px}.material-visual h3{font-size:14px}.material-visual p{font-size:10px}.equipment-steps{grid-template-columns:1fr;gap:10px}.equipment-step{padding:18px}.equipment-step .icon{width:23px;height:23px;margin-bottom:12px}.equipment-step h3{font-size:15px}.equipment-step p{font-size:11px}.stat-compare{gap:11px}.stat-compare div{padding:17px}.stat-compare strong{font-size:31px}.stat-compare span{font-size:11px}.code-grid{gap:8px}.sextant-tile{padding:16px 6px}.sextant-tile strong{font-size:29px}.sextant-tile span{font-size:9px}.timeline-item{padding-left:37px}.timeline::before{left:11px}.timeline-dot{left:0;width:23px;height:23px;border-width:4px}.timeline-card{padding:21px 19px}.timeline-card h2{font-size:19px}.timeline-card p{font-size:12px}.timeline-card li{font-size:11px}.timeline-ready{font-size:11px}.filter-bar{margin:20px 0}.resource-note{font-size:10px;padding:15px}.lesson-meta .tag{font-size:10px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important;animation:none!important}}
@media print{.sidebar,.topbar,.main-footer,.lesson-tools,.lesson-end,.video-grid,.search-dialog,.video-dialog,.hero-actions,.hero-note,.nav-link{display:none!important}.app-shell{margin:0}#main-content{padding:0;max-width:none}body{background:white;font-size:11pt}.lesson-section,.visual-panel{break-inside:avoid;box-shadow:none}.lesson-section:not([open])>.section-body{display:block}.lesson-section summary{font-size:14pt}.lesson-section summary::after{display:none}.lesson-heading h1{font-size:28pt}.objectives{break-inside:avoid}.visual-panel{padding:15px}.mouth-chart{grid-template-columns:1fr 1fr}.source-link{padding:7px;font-size:9pt}a{color:#192b29}.diagram-stage{min-height:0}.diagram-stage>svg{max-height:270px}.explorer-grid{grid-template-columns:1fr 1fr}.table-wrap{overflow:visible}table{font-size:9pt}}

.video-search{display:flex;align-items:center;gap:9px;padding:9px 12px;border:1px solid var(--line);border-radius:9px;background:white;color:var(--muted);min-width:175px}.video-search .icon{width:16px;height:16px}.video-search input{min-width:0;width:160px;background:none;border:0;color:var(--ink);font-size:12px;outline:0}.video-search:focus-within{outline:2px solid var(--teal);outline-offset:2px}#lesson-videos{scroll-margin-top:100px}.source-link strong{overflow-wrap:anywhere}@media(max-width:600px){.video-search{flex:1;min-width:200px}.video-search input{width:100%}.lesson-tools{display:flex;gap:0}.lesson-tools .text-button{font-size:10px;padding:7px}.video-player{aspect-ratio:auto;height:max(200px,54vw)}}

.read-button{color:var(--teal-dark)}.next-lesson{display:flex;align-items:center;justify-content:space-between;gap:20px;text-decoration:none;border:1px solid var(--line);background:#fff;padding:10px 14px;border-radius:8px;max-width:300px}.next-lesson:hover{border-color:var(--teal);background:#f3f8f0}.next-lesson span{margin:0;opacity:1}.next-lesson small{display:block;font-size:9px;color:var(--muted);margin-bottom:3px}.next-lesson strong{display:block;font-size:12px;line-height:1.4}.next-lesson .icon{flex:0 0 auto;color:var(--teal)}

.lesson-section summary:focus-visible{outline-offset:-4px}

.academy-back{display:inline-flex;align-items:center;gap:7px}.academy-back:hover{color:var(--teal)}

/* Incisor views need enough vertical room for both labelled illustrations. */
@media screen{.incisor-stage>svg{max-height:none}.incisor-explorer{align-items:start}}
.surface-example ul{margin:10px 0 0;padding-left:18px}.surface-example li{margin:6px 0;line-height:1.65}