@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

:root{--ink:#0b1020;--slate:#11192b;--bone:#f4f1e8;--fog:#aab2c0;--line:#2a3449;--red:#e64b4b;--red2:#ff7474;--r:14px;font-family:"Inter",sans-serif;color:var(--bone);background:var(--ink)}
html,body,button,input,textarea,select,*{font-family:"Inter",sans-serif!important}
*{box-sizing:border-box}body{margin:0;background:var(--ink);color:var(--bone)}button,input,textarea{font:inherit}button{color:inherit}.timecode{font-family:"Inter",sans-serif;font-size:.72rem;letter-spacing:.11em}.app-shell{display:grid;grid-template-columns:280px 1fr;grid-template-rows:74px calc(100dvh - 74px);min-height:100dvh;background:radial-gradient(circle at 76% 6%,#1a2440 0,transparent 28%),var(--ink)}.topbar{grid-column:1/-1;display:flex;align-items:center;border-bottom:1px solid var(--line);padding:0 26px;position:relative;z-index:5;background:rgba(11,16,32,.92);backdrop-filter:blur(16px)}.brand{border:0;background:none;display:flex;align-items:center;gap:12px;font-weight:700;font-size:1.05rem;cursor:pointer}.brand-mark{display:grid;place-items:center;width:38px;height:38px;background:var(--red);border-radius:10px;color:var(--ink)}.progress-readout{margin:auto;display:flex;align-items:center;gap:15px;color:var(--fog)}.progress-readout>div{width:150px;height:4px;background:var(--line)}.progress-readout i{display:block;height:100%;background:var(--red);transition:width .4s ease}.teacher-mark{font-family:"Inter",sans-serif;font-size:.72rem;border:1px solid var(--line);padding:10px 13px}.rail{grid-row:2;border-right:1px solid var(--line);padding:25px 18px;overflow:auto;background:#0d1424}.rail-title{display:flex;flex-direction:column;gap:5px;padding:0 8px 20px}.rail-title span{color:var(--red2)}.rail-title strong{font-size:1.15rem}.rail nav{position:relative}.rail nav:before{content:"";position:absolute;left:24px;top:20px;bottom:20px;width:1px;background:var(--line)}.rail nav button{position:relative;width:100%;display:grid;grid-template-columns:40px 14px 1fr 18px;align-items:center;gap:8px;border:0;background:transparent;padding:9px 7px;text-align:left;cursor:pointer;border-radius:10px;color:var(--fog);transition:.2s}.rail nav button:hover,.rail nav button.current{background:#1a2438;color:var(--bone);transform:translateX(2px)}.rail nav button>span{font-family:"Inter";font-size:.72rem}.rail nav i{width:9px;height:9px;border-radius:50%;background:var(--line);z-index:1}.rail nav button.current i{background:var(--red);box-shadow:0 0 0 4px rgba(230,75,75,.16)}.rail nav b{font-size:.88rem}.rail nav em{font-style:normal;color:var(--red2)}.export{width:100%;margin-top:22px;padding:13px;border:1px solid var(--fog);background:none;border-radius:var(--r);cursor:pointer}.export:hover{border-color:var(--red);color:var(--red2)}main{grid-row:2;overflow:auto;scrollbar-color:var(--red) #11192b}.hero{height:min(680px,calc(100dvh - 74px));min-height:560px;position:relative;overflow:hidden;border-bottom:1px solid var(--line)}.hero>img{width:100%;height:100%;object-fit:cover}.hero-shade{position:absolute;inset:0;background:linear-gradient(90deg,rgba(8,12,24,.96) 3%,rgba(8,12,24,.72) 46%,rgba(8,12,24,.1) 78%),linear-gradient(0deg,rgba(8,12,24,.62),transparent 45%)}.hero-copy{position:absolute;left:clamp(28px,6vw,90px);top:50%;transform:translateY(-50%);max-width:700px}.hero-copy>.timecode{color:var(--red2)}h1,h2,p{margin-top:0}.hero h1,.level-head h1{font-size:clamp(3rem,6vw,6rem);line-height:.94;letter-spacing:-.055em;max-width:800px;margin:22px 0}.hero-copy>p:not(.timecode){font-size:1.25rem;line-height:1.5;color:#d5d8df;max-width:520px}.hero-copy button{margin-top:22px;border:0;background:var(--red);color:#111;padding:16px 21px;border-radius:10px;font-weight:700;cursor:pointer}.hero-copy button:active{transform:translateY(1px)}.frame-count{position:absolute;right:32px;bottom:25px;font:600 .75rem "Inter";background:rgba(11,16,32,.8);padding:9px 12px}.timeline-section,.project-tease,.level-page{padding:clamp(35px,5vw,80px)}.section-head{display:flex;justify-content:space-between;align-items:end;gap:40px;margin-bottom:35px}.section-head h2,.project-tease h2{font-size:clamp(2.2rem,4vw,4.3rem);letter-spacing:-.045em;margin:7px 0}.section-head>p{color:var(--fog);max-width:420px;line-height:1.55}.master-timeline{display:grid;grid-auto-flow:column;grid-auto-columns:minmax(170px,1fr);overflow:auto;padding:15px 0 25px;position:relative}.master-timeline:before{content:"";position:absolute;top:53px;left:0;right:0;height:2px;background:var(--line)}.master-timeline button{min-height:145px;border:0;border-left:1px solid var(--line);background:transparent;text-align:left;padding:12px 16px;cursor:pointer;display:flex;flex-direction:column;gap:12px;position:relative}.master-timeline button:before{content:"";position:absolute;top:34px;left:13px;width:11px;height:11px;border-radius:50%;background:var(--line)}.master-timeline button:hover{background:#131d31}.master-timeline button:hover:before,.master-timeline button.done:before{background:var(--red)}.master-timeline span,.master-timeline small{font:500 .68rem "Inter";color:var(--fog)}.master-timeline b{margin-top:25px}.project-tease{display:grid;grid-template-columns:1.2fr .8fr;gap:0;align-items:stretch}.project-tease img{width:100%;height:450px;object-fit:cover;border-radius:var(--r) 0 0 var(--r)}.project-tease>div{background:var(--bone);color:var(--ink);padding:clamp(30px,5vw,70px);border-radius:0 var(--r) var(--r) 0;display:flex;flex-direction:column;justify-content:center}.project-tease p:not(.timecode){font-size:1.1rem;line-height:1.55}.project-tease button{align-self:flex-start;border:0;border-bottom:2px solid var(--red);background:none;color:var(--ink);font-weight:700;padding:8px 0;cursor:pointer}.level-page{max-width:1500px;margin:auto}.level-head{display:grid;grid-template-columns:1fr 290px;gap:50px;border-bottom:1px solid var(--line);padding-bottom:40px}.back{border:0;background:none;color:var(--fog);padding:0 0 28px;cursor:pointer}.level-head .timecode{color:var(--red2)}.goal{display:grid;grid-template-columns:90px 1fr;gap:18px;max-width:740px;color:#d5d8df;line-height:1.55}.goal span{font:600 .7rem "Inter";color:var(--red2);padding-top:4px}.tool-roll{align-self:end;display:flex;flex-wrap:wrap;gap:8px}.tool-roll span{border:1px solid var(--line);padding:9px 11px;border-radius:999px;color:var(--fog);font-size:.82rem}.media-bay{margin:48px 0}.media-top,.notebook-head{display:flex;justify-content:space-between;color:var(--fog);font-size:.75rem;margin-bottom:10px}.media-screen{aspect-ratio:16/7;background:#070b14;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;display:grid;place-items:center}.media-screen img,.media-screen video{width:100%;height:100%;object-fit:cover}.media-screen audio{width:min(600px,85%)}.screen-empty{text-align:center;color:var(--fog);display:grid;gap:8px}.screen-empty>span{font-size:4rem;color:var(--red)}.screen-empty strong{color:var(--bone);font-size:1.25rem}.upload-cut{display:inline-block;margin-top:10px;background:var(--bone);color:var(--ink);padding:10px 14px;border-radius:8px;font-weight:700;cursor:pointer}.upload-cut input{display:none}.work-grid{display:grid;grid-template-columns:.88fr 1.12fr;gap:38px}.script,.notebook{border-top:2px solid var(--bone);padding-top:22px}.script>ol{list-style:none;padding:0;margin:24px 0}.script li{display:grid;grid-template-columns:48px 1fr;gap:18px;border-top:1px solid var(--line);padding:19px 0}.script li>span{font:600 .78rem "Inter";color:var(--red2)}.script li p{line-height:1.55}.help-toggle{width:100%;display:flex;justify-content:space-between;border:1px solid var(--line);background:none;padding:14px;cursor:pointer}.help-box{border:1px solid var(--red);border-top:0;padding:18px;color:#d5d8df}.help-box p{margin:0 0 8px}.notebook{background:#121b2d;padding:22px;border-radius:var(--r)}.field{display:block;margin:0 0 18px}.field>span{display:block;font-size:.88rem;font-weight:600;margin-bottom:8px}.field textarea{width:100%;resize:vertical;background:#0a1020;color:var(--bone);border:1px solid #354058;border-radius:9px;padding:13px;line-height:1.45}.field textarea:focus{outline:2px solid var(--red);border-color:transparent}.sync-strip{margin:25px 0;padding:18px;background:#080d19;border-radius:var(--r)}.ticks{display:grid;grid-template-columns:repeat(21,1fr);height:78px;border-bottom:1px solid var(--fog)}.ticks button{border:0;background:none;padding:0;position:relative;cursor:pointer}.ticks i{position:absolute;bottom:0;left:50%;width:1px;height:28px;background:var(--fog)}.ticks button.active i{width:4px;height:58px;background:var(--red)}.ticks span{position:absolute;bottom:-22px;left:2px;font:500 .55rem "Inter";color:var(--fog)}.sync-strip p{margin:35px 0 0;color:var(--fog);font-size:.85rem}.story-section,.checkpoint{margin-top:70px}.story-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.story-card{background:#131d31;border:1px solid var(--line);padding:17px;border-radius:var(--r)}.story-card>.timecode{color:var(--red2);display:block;margin-bottom:16px}.checkpoint{border:1px solid var(--line);padding:24px;border-radius:var(--r)}.checkpoint>div{display:grid;grid-template-columns:repeat(5,1fr);gap:10px}.checkpoint label{background:#131d31;padding:14px;display:flex;gap:9px;align-items:center}.checkpoint input{accent-color:var(--red)}.level-next{display:flex;justify-content:space-between;align-items:center;border-top:1px solid var(--line);margin-top:65px;padding-top:25px}.level-next button{border:0;background:none;color:var(--bone);cursor:pointer}.level-next button:disabled{opacity:.25}.center-state{min-height:100dvh;display:grid;place-content:center;text-align:center}.center-state button,.center-state a{color:var(--red2)}
@media(max-width:900px){.app-shell{display:block}.topbar{height:66px;position:sticky;top:0}.progress-readout{display:none}.teacher-mark{margin-left:auto}.rail{position:sticky;top:66px;z-index:4;border-right:0;border-bottom:1px solid var(--line);padding:8px 14px;overflow-x:auto}.rail-title,.export{display:none}.rail nav{display:flex;min-width:max-content}.rail nav:before{top:28px;left:25px;right:25px;bottom:auto;width:auto;height:1px}.rail nav button{width:62px;display:flex;flex-direction:column;gap:4px;text-align:center;padding:4px}.rail nav button b{display:none}.rail nav i{order:2}.rail nav span{order:1}.rail nav em{position:absolute;right:3px;top:0}.app-shell main{overflow:visible}.hero{height:660px}.hero-shade{background:linear-gradient(0deg,rgba(8,12,24,.96) 7%,rgba(8,12,24,.52) 75%)}.hero-copy{left:24px;right:24px;top:auto;bottom:55px;transform:none}.hero h1{font-size:3.15rem}.section-head,.level-head{display:block}.section-head>p{margin-top:18px}.project-tease,.work-grid{grid-template-columns:1fr}.project-tease img{height:300px;border-radius:var(--r) var(--r) 0 0}.project-tease>div{border-radius:0 0 var(--r) var(--r)}.level-page{padding:30px 20px}.level-head h1{font-size:3rem}.tool-roll{margin-top:25px}.media-screen{aspect-ratio:16/10}.story-grid{grid-template-columns:1fr}.checkpoint>div{grid-template-columns:1fr}.goal{grid-template-columns:1fr}.level-next{gap:12px}.level-next button{font-size:.8rem}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}

/* Scene 1: extend the existing editing-room palette. */
.perception{margin-top:28px}.example-tabs,.music-switch,.answer-tabs{display:flex;flex-wrap:wrap;gap:8px}.example-tabs{margin-bottom:26px}.example-tabs button,.music-switch button,.answer-tabs button,.perception-chips button{background:var(--slate);border:1px solid #566078;border-radius:8px;padding:10px 15px;cursor:pointer;color:var(--bone);font-size:1rem}.example-tabs button{flex:1;text-align:left;min-width:150px;font-weight:600}.example-tabs small{display:block;color:var(--fog);font-weight:400;margin-top:4px;font-size:.875rem}.perception button[aria-pressed=true]{background:var(--bone);color:var(--ink);border-color:var(--bone)}.perception button[aria-pressed=true] small{color:#343d50}.perception button:focus-visible,.perception input:focus-visible{outline:3px solid var(--red2);outline-offset:3px}.perception button:disabled{opacity:.4;cursor:not-allowed}.example-heading h2,.observation h2,.perception-summary h2{font-size:1.6rem;margin-bottom:10px}.example-heading p,.perception-summary p{line-height:1.55;color:#cbd1dc;max-width:900px}.experiment-player{border:1px solid var(--line);border-radius:14px;background:#070b14;overflow:hidden}.music-switch{padding:14px;background:#121b2d}.experiment-player video{display:block;width:100%;max-height:62vh;aspect-ratio:16/9;object-fit:contain;background:#000}.experiment-player audio{display:none}.player-note{color:var(--fog);font-size:.875rem;padding:12px 16px;margin:0}.experiment-empty{padding:45px 20px;text-align:center}.experiment-empty p{color:var(--fog);margin:12px 0 0}.player-error{color:#ffbaba;padding:0 16px}.media-setup{padding:18px;border:1px solid var(--line);border-radius:10px;margin-top:16px}.media-setup summary{cursor:pointer;font-weight:600}.media-setup p{color:var(--fog);line-height:1.5;margin:15px 0}.media-setup>div{display:grid;grid-template-columns:1fr 1fr;gap:16px}.media-setup label{display:grid;gap:8px;min-width:0}.media-setup input{max-width:100%;font-size:.875rem}.observation{margin-top:32px;background:#121b2d;border:1px solid var(--line);border-radius:14px;padding:24px}.observation-head{display:flex;align-items:baseline;justify-content:space-between;gap:15px;flex-wrap:wrap;margin-bottom:12px}.observation-head>span{font-size:.875rem;color:var(--fog)}.answer-caption{color:var(--red2);margin:16px 0;font-size:1rem}.observation-block{padding:22px 0;border-top:1px solid var(--line)}.observation-block:last-child{padding-bottom:0}.observation-block h3{font-size:1.2rem;margin:0 0 18px}.perception-chips{border:0;padding:0;margin:0 0 18px;min-width:0}.perception-chips legend{font-size:.875rem;color:var(--fog);margin-bottom:9px}.perception-chips>div{display:flex;flex-wrap:wrap;gap:7px}.perception-chips button{font-size:.9375rem;padding:8px 12px;border-radius:999px}.parameter-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px 24px}.parameter-grid fieldset:last-child{grid-column:1/-1}.perception .field>span{font-size:1rem}.perception-summary{margin-top:32px;border-top:2px solid var(--red);padding-top:24px}.level-page:has(.perception) .level-head{grid-template-columns:1fr;gap:0;padding-bottom:22px}.level-page:has(.perception) .level-head h1{font-size:clamp(2rem,4vw,3.5rem);line-height:1.08;margin:10px 0 18px}.level-page:has(.perception) .tool-roll{display:none}.level-page:has(.perception) .back{padding-bottom:15px}@media(max-width:650px){.parameter-grid,.media-setup>div{grid-template-columns:1fr}.observation{padding:16px}.example-tabs button{min-width:42%;padding:10px}.music-switch button{flex:1 0 auto;padding:9px 11px}.experiment-player video{max-height:none}.example-tabs small{font-size:.875rem}.level-page:has(.perception){padding:24px 14px}}

.perception .experiment-player{max-width:640px;margin-inline:auto}.perception .experiment-player video{max-height:none;width:100%;aspect-ratio:16/9}.perception .music-switch{gap:6px;padding:10px}.perception .music-switch button{padding:9px 12px;font-size:.9375rem}
.video-stage{position:relative;background:#000}.now-playing{position:absolute;z-index:2;top:12px;right:12px;display:flex;align-items:center;gap:8px;padding:8px 11px;border:1px solid rgba(255,255,255,.22);border-radius:7px;background:rgba(7,11,20,.82);backdrop-filter:blur(8px);font:600 .72rem "Inter",sans-serif;letter-spacing:.06em;box-shadow:0 3px 14px rgba(0,0,0,.32)}.now-playing i{display:block;width:8px;height:8px;border-radius:50%;background:#7a8291}.now-playing.active i{background:var(--red);box-shadow:0 0 0 4px rgba(230,75,75,.2);animation:live-pulse 1.8s infinite}.video-stage .experiment-empty{min-height:260px;display:grid;place-content:center}.player-note{text-align:center}@keyframes live-pulse{50%{box-shadow:0 0 0 7px rgba(230,75,75,0)}}

/* Film player modelled on the reference experiment. */
.perception .experiment-player{border:2px solid #343c49;border-radius:12px;background:#171c24}.perception .music-switch{border-bottom:1px solid #343c49}.film-frame{position:relative;margin:0 10px;padding:12px 0;background:#050607}.film-frame:before,.film-frame:after{content:"";position:absolute;z-index:3;left:0;right:0;height:12px;pointer-events:none;background:repeating-linear-gradient(90deg,#050607 0 12px,#3b4552 12px 24px)}.film-frame:before{top:0}.film-frame:after{bottom:0}.video-stage{overflow:hidden}.video-stage video{cursor:pointer}.playback-rate{position:absolute;z-index:4;top:17px;left:8px;padding:2px 4px;background:rgba(112,111,29,.45);color:#ece99a;font:500 .68rem "Inter",sans-serif}.now-playing{top:22px;right:0;border:0;border-radius:6px 0 0 6px;background:#596574;text-transform:uppercase;font-size:.68rem}.now-playing i,.now-playing.active i{width:9px;height:9px;background:var(--red);box-shadow:none;animation:none}.custom-controls{display:grid;grid-template-columns:auto auto 1fr;align-items:center;gap:12px;padding:9px 12px 10px;background:#171c24}.play-control{display:flex;align-items:center;gap:9px;border:0;border-radius:9px;background:#f5b335;color:#111820;padding:11px 17px;font-weight:700;cursor:pointer}.play-control:disabled{opacity:.45;cursor:not-allowed}.play-control span{font-size:.74rem}.time-display{white-space:nowrap;color:#dbe0e8;font-size:.88rem}.seek-control{width:100%;height:6px;border:0;border-radius:999px;appearance:none;-webkit-appearance:none;cursor:pointer}.seek-control::-webkit-slider-runnable-track{height:6px;border-radius:999px;background:transparent}.seek-control::-webkit-slider-thumb{width:18px;height:18px;margin-top:-6px;border:0;border-radius:50%;appearance:none;-webkit-appearance:none;background:#fff;box-shadow:0 1px 4px rgba(0,0,0,.5)}.seek-control::-moz-range-track{height:6px;border-radius:999px;background:transparent}.seek-control::-moz-range-thumb{width:18px;height:18px;border:0;border-radius:50%;background:#fff;box-shadow:0 1px 4px rgba(0,0,0,.5)}.seek-control:disabled{opacity:.45;cursor:not-allowed}.perception .player-note{padding:0 12px 10px;text-align:left;color:#8f98a8;font-size:.76rem}@media(max-width:650px){.film-frame{margin:0 6px;padding:9px 0}.film-frame:before,.film-frame:after{height:9px;background:repeating-linear-gradient(90deg,#050607 0 9px,#3b4552 9px 18px)}.custom-controls{grid-template-columns:auto 1fr;gap:9px}.time-display{font-size:.75rem}.seek-control{grid-column:1/-1}.play-control{padding:9px 13px}.now-playing{top:17px}}