Astra!ny-start

1 files changed, 256 insertions, 170 deletions

diff --git a/src/style.css b/src/style.css
index f494d8e..5ef2c34 100644
--- a/src/style.css
+++ b/src/style.css
@@ -1,180 +1,266 @@
 :root {
-  font-family: Inter, 'Segoe UI', system-ui, sans-serif;
-  color: #dbe7f0;
-  background: #101822;
+  font-family: "Segoe UI", -apple-system, BlinkMacSystemFont, sans-serif;
+  color: #243b3c;
+  background: #f6f7f3;
   font-synthesis: none;
-  color-scheme: dark;
-  --mint: #91e2cb;
-  --muted: #98adbf;
-  --border: #2a394a;
+  text-rendering: optimizeLegibility;
+  -webkit-font-smoothing: antialiased;
+  font-weight: 400;
+  --accent: #287a6a;
+  --muted: #6b7775;
+  --border: #dce3dd;
 }
+
 * { box-sizing: border-box; }
-[hidden] { display: none !important; }
+html { scroll-behavior: smooth; scroll-padding-top: 30px; }
 body { margin: 0; }
-button, select, input { font: inherit; }
-button, select { color: inherit; }
-button, a, select, input { -webkit-tap-highlight-color: transparent; }
+button, input { font: inherit; }
+button, a, input, summary { -webkit-tap-highlight-color: transparent; }
 button { cursor: pointer; }
-a { color: var(--mint); text-underline-offset: 4px; }
-button:focus-visible, a:focus-visible, select:focus-visible, input:focus-visible, canvas:focus-visible, summary:focus-visible { outline: 2px solid var(--mint); outline-offset: 4px; }
-.app-header { min-height: 96px; display: flex; align-items: center; gap: 22px; padding: 20px 32px; border-bottom: 1px solid var(--border); background: #121d29; }
-.brand { flex-shrink: 0; font: 700 19px monospace; text-decoration: none; color: var(--mint); border: 1px solid #3c7069; border-radius: 9px; padding: 15px 12px; }
-.brand span { color: #516a79; padding: 0 3px; }
-h1 { font-size: 19px; font-weight: 600; margin: 0; }
-.header-title p { margin: 6px 0 0; color: var(--muted); font-size: 13px; }
-.status { margin-left: auto; color: var(--mint); font: 10px monospace; letter-spacing: 1px; white-space: nowrap; display: flex; align-items: center; gap: 8px; }
-.status i { background: var(--mint); width: 6px; height: 6px; border-radius: 50%; }
-.subjects { background: #121d29; border-bottom: 1px solid var(--border); overflow-x: auto; padding: 0 24px; }
-[role='tablist'] { display: flex; min-width: max-content; }
-[role='tab'] { display: flex; align-items: center; gap: 9px; background: transparent; border: 0; border-bottom: 2px solid transparent; padding: 20px 13px; font-size: 12px; color: var(--muted); white-space: nowrap; }
-[role='tab'] span { color: #71899d; font: 10px monospace; }
-[role='tab']:hover { background: #1b2b3a; color: #dbe7f0; }
-[role='tab'][aria-selected='true'] { color: var(--mint); border-bottom-color: var(--mint); background: #192b32; }
-[role='tab'][aria-selected='true'] span { color: var(--mint); }
-main { display: grid; grid-template-columns: 310px minmax(0, 1fr); min-height: calc(100dvh - 153px); }
-.controls-panel { padding: 28px 25px; border-right: 1px solid var(--border); background: #15212e; }
-.eyebrow { font: 10px monospace; color: var(--mint); letter-spacing: 2px; margin: 0 0 14px; }
-h2 { font-size: 26px; font-weight: 550; letter-spacing: -0.5px; line-height: 1.25; margin: 0 0 15px; }
-p { line-height: 1.7; }
-.description { color: var(--muted); font-size: 13px; margin: 0 0 30px; }
-.parameter { margin: 24px 0; }
-.parameter-label { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; }
-label { font-size: 12px; color: #c2d0dd; }
-output { flex-shrink: 0; color: var(--mint); font: 12px monospace; }
-input[type='range'] { display: block; width: 100%; accent-color: var(--mint); margin: 14px 0 0; cursor: pointer; }
-input:disabled { opacity: 0.35; cursor: default; }
-select { display: block; width: 100%; padding: 10px 8px; border: 1px solid #3b4d60; border-radius: 6px; background: #1c2c3d; margin-top: 10px; font-size: 12px; }
-.panel-actions button { width: 100%; border: 1px solid #3b4d60; border-radius: 6px; background: #1c2c3d; padding: 11px; font-size: 12px; }
-button:hover { border-color: var(--mint); }
-.measurements { margin-top: 25px; border: 1px solid #2a4252; border-radius: 8px; padding: 4px 16px; background: #101c27; }
-.measurement { padding: 14px 0; }
-.measurement + .measurement { border-top: 1px solid #243342; }
-.measurement > span { display: block; font-size: 11px; color: var(--muted); }
-.measurement > div { display: flex; align-items: baseline; gap: 8px; margin-top: 6px; }
-.measurement strong { font: 23px monospace; color: var(--mint); }
-.measurement small { font-size: 11px; color: var(--muted); }
-.workbench { min-width: 0; }
-#viewport { position: relative; height: clamp(480px, 64dvh, 800px); min-width: 0; overflow: hidden; }
-#viewport > canvas { display: block; position: absolute; inset: 0; width: 100%; height: 100%; touch-action: none; }
-.scene-labels { position: absolute; inset: 0; pointer-events: none; z-index: 0; overflow: hidden; container-type: inline-size; }
-.scene-math-label { pointer-events: none; white-space: nowrap; padding: 2px 5px; border-radius: 3px; background: #101822d9; font-size: 13px; line-height: 1.5; }
-@container (max-width: 599px) { .scene-math-label { font-size: 11px; } }
-.scene-toolbar { position: absolute; z-index: 1; top: 20px; left: 24px; right: 24px; display: flex; justify-content: space-between; align-items: center; gap: 10px; pointer-events: none; }
-.view-tag { font: 10px monospace; color: #71899d; letter-spacing: 2px; }
-.scene-toolbar > div { display: flex; gap: 8px; }
-.scene-toolbar button { pointer-events: auto; background: #15212ee8; border: 1px solid #34495c; border-radius: 5px; padding: 7px 10px; font-size: 11px; }
-.legend { position: absolute; z-index: 1; pointer-events: none; left: 24px; top: 64px; display: flex; flex-wrap: wrap; gap: 8px 18px; right: 24px; }
-.legend span { display: flex; align-items: center; gap: 6px; color: var(--muted); font-size: 10px; }
-.legend i { display: inline-block; width: 5px; height: 5px; border-radius: 50%; }
-.scene-footer { position: absolute; z-index: 1; pointer-events: none; bottom: 0; padding: 24px 24px 12px; width: 100%; background: linear-gradient(transparent, #101822ed); }
-.scene-footer p { margin: 3px 0; color: #b3c8d7; font-size: 11px; line-height: 1.6; }
-.scene-footer .hint { color: #7890a4; font-size: 10px; }
-.learning-panel { display: grid; grid-template-columns: 1.3fr 1fr; gap: 36px; padding: 28px 32px; border-top: 1px solid var(--border); background: #121d29; }
-.learning-panel p { font-size: 13px; color: var(--muted); margin: 12px 0; }
-.learning-panel .eyebrow { color: var(--mint); font-size: 10px; margin: 0 0 14px; }
-.learning-panel > div { min-width: 0; }
-.equations p { color: #e3ecf3; font-size: 16px; margin: 8px 0; }
-.learning-panel a { font-size: 11px; }
-.challenge { border-left: 1px solid var(--border); padding-left: 30px; }
-.challenge > p:not(.eyebrow) { color: #cad8e4; }
-details { margin-top: 20px; }
-summary { color: var(--muted); font-size: 11px; cursor: pointer; }
-.collections { display: flex; align-items: center; gap: 5px; margin-left: auto; padding: 4px; background: #0c151f; border: 1px solid var(--border); border-radius: 8px; flex-shrink: 0; }
-.collections a { color: var(--muted); text-decoration: none; font-size: 12px; padding: 10px 13px; border-radius: 5px; }
-.language-picker { display: flex; align-items: center; gap: 8px; margin-left: 6px; padding: 0 8px 0 10px; border-left: 1px solid var(--border); color: var(--muted); font-size: 12px; }
-.language-picker select { width: auto; margin: 0; padding: 8px 8px; }
-.collections a[aria-current] { background: #234139; color: #b0f3dc; }
-.test-overview { display: flex; justify-content: space-between; align-items: center; gap: 32px; padding: 30px 34px; background: radial-gradient(ellipse at 80% 0%, #20413988, transparent 65%), #121d29; border-bottom: 1px solid var(--border); }
-.test-overview .eyebrow { font-size: 9px; margin-bottom: 10px; }
-.test-overview h2 { font-size: clamp(22px, 2.4vw, 34px); font-weight: 500; letter-spacing: -1px; margin-bottom: 8px; }
-.test-overview p:last-child { font-size: 12px; color: var(--muted); margin: 0; }
-.test-score { flex-shrink: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 10px 24px; }
-.test-score strong { font: 17px ui-monospace, monospace; color: var(--mint); }
-.test-score strong span { font-size: 11px; color: var(--muted); }
-.test-score > span { grid-column: 1 / -1; font-size: 10px; color: var(--muted); }
-[role='tab'] small { font: 10px ui-monospace, monospace; color: #729989; padding: 3px 5px; border: 1px solid #294739; border-radius: 4px; }
-.test-question { padding: 14px 16px; margin: 0 0 24px; border-left: 2px solid #708b7e; background: #1b2d35; border-radius: 0 7px 7px 0; }
-.test-question p { font-size: 12px; line-height: 1.75; margin: 9px 0 0; color: #bdcbd5; }
-.test-question .question-lead { margin-top: 0; color: #eef3ed; }
-.observation { padding: 18px 30px; background: #192e31; border-top: 1px solid #2c4947; border-bottom: 1px solid #2c4947; }
-.observation .eyebrow { font-size: 9px; }
-.observation p { margin: 8px 0 0; font-size: 13px; line-height: 1.75; color: #d1e3df; }
-.test-study { padding: 30px 32px; background: #101b26; border-top: 1px solid var(--border); }
-.solution-heading { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 22px; }
-.solution-heading .eyebrow { margin-bottom: 8px; }
-.solution-heading h3 { font-weight: 500; font-size: 23px; margin: 0; letter-spacing: -0.5px; }
-.solution-heading a { font-size: 11px; }
-.solution details { border: 1px solid #314555; border-radius: 8px; background: #152331; margin: 12px 0; overflow: hidden; }
-.solution summary { font-size: 13px; color: #d0e1e8; padding: 17px 20px; line-height: 1.6; }
-.solution details[open] summary { color: var(--mint); border-bottom: 1px solid #314555; }
-.derivation { margin: 0; padding: 8px 24px 20px 52px; counter-reset: step; }
-.derivation li { padding: 8px 0 0 6px; color: var(--mint); }
-.derivation li::marker { font: 13px ui-monospace, monospace; }
-.derivation p { font-size: 13px !important; color: #a9becb; line-height: 1.8; margin: 8px 0; }
-.derivation .math-step { font-size: 15px !important; color: #edf4ef; background: #0d1924; border-radius: 5px; padding: 12px 14px; }
-.prediction { padding: 24px; margin-top: 24px; border: 1px solid #5b5138; border-radius: 8px; background: #262a28; }
-.prediction .eyebrow { color: var(--gold, #f5d58b); }
-.prediction h3 { font-size: 16px; font-weight: 500; line-height: 1.65; margin: 0 0 16px; }
-.prediction button { background: transparent; border: 1px solid #8c805b; border-radius: 5px; color: #f5d58b; padding: 9px 13px; font-size: 12px; }
-.prediction > p:last-child { font-size: 13px; color: #d3d6c6; line-height: 1.8; margin: 18px 0 0; }
-.lesson-pagination { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 10px; margin-top: 30px; }
-.lesson-pagination a { font-size: 12px; text-decoration: none; }
-.lesson-pagination a:first-child { grid-column: 1; }
-.lesson-pagination span { grid-column: 2; font: 11px ui-monospace, monospace; color: var(--muted); }
-.lesson-pagination a:last-child { grid-column: 3; text-align: right; }
-.math-display { max-width: 100%; min-width: 0; overflow-x: auto; overflow-y: hidden; padding: 6px 2px; scrollbar-width: thin; scrollbar-color: #526e7c transparent; }
-.math-display .katex-display { text-align: left; margin: 0.5em 0; }
-.math-display .katex-display > .katex { text-align: left; }
-.katex { font-size: 1.08em; }
-.math-display:focus-visible { outline: 2px solid var(--mint); outline-offset: 3px; }
+button:disabled { cursor: default; opacity: 0.4; }
+a { color: inherit; }
+button, a, input, summary, canvas { outline-offset: 5px; }
+:focus-visible { outline: 3px solid #428dce; }
+button { transition: background 150ms ease, border-color 150ms ease, color 150ms ease; }
+[hidden] { display: none !important; }
+h1, h2, h3, p { margin: 0; }
+.icon { width: 20px; height: 20px; flex-shrink: 0; vertical-align: middle; }
+.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
+.skip-link { position: fixed; top: -100px; left: 20px; z-index: 10; background: white; padding: 12px 20px; border-radius: 6px; }
+.skip-link:focus { top: 12px; }
+.site-header { height: 88px; max-width: 1480px; padding: 0 48px; margin: auto; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--border); }
+.brand { text-decoration: none; display: flex; align-items: center; gap: 10px; }
+.brand > .icon { width: 35px; height: 35px; color: var(--accent); }
+.brand > span:first-of-type { font-size: 27px; font-weight: 650; letter-spacing: -1.2px; }
+.brand-divider { height: 23px; width: 1px; background: #d2dbd5; margin: 0 10px; }
+.brand small { color: var(--muted); font-size: 12px; letter-spacing: 0.1px; }
+.site-header nav { display: flex; align-items: center; gap: 29px; }
+.nav-link { font-size: 13px; text-decoration: none; color: #65716d; }
+.nav-link:hover { color: var(--accent); }
+.model-number { padding: 7px 10px; background: #e8ede6; border-radius: 5px; color: #586b60; font-family: "Consolas", monospace; font-size: 10px; letter-spacing: 1.2px; }
+main { max-width: 1384px; margin: 0 auto; padding: 0 40px; }
+main:focus { outline: none; }
+.intro { display: flex; justify-content: space-between; align-items: center; gap: 20px; padding: 46px 0 32px; }
+.eyebrow { color: var(--accent); font-size: 10px; font-weight: 650; letter-spacing: 1.9px; display: flex; align-items: center; gap: 9px; }
+.little-line { height: 1px; width: 22px; background: var(--accent); }
+h1 { font-size: clamp(30px, 3.1vw, 43px); font-weight: 550; line-height: 1.2; letter-spacing: -1.7px; margin-top: 12px; color: #203c3a; }
+.subtitle { color: var(--muted); font-size: 14px; line-height: 1.65; margin-top: 13px; }
+.topic-tag { display: flex; align-items: center; gap: 8px; flex-shrink: 0; border: 1px solid #d4dfd5; border-radius: 20px; padding: 8px 13px; font-size: 12px; color: #57705d; background: #eef2e9; }
+.topic-tag .icon { width: 17px; height: 17px; }
+.lab { display: grid; grid-template-columns: minmax(0, 1fr) 310px; background: #fff; border: 1px solid #d6dfd8; border-radius: 13px; overflow: hidden; box-shadow: 0 8px 25px #233e3610; }
+.visual-column { min-width: 0; display: flex; flex-direction: column; }
+.scene-wrap { position: relative; min-height: 510px; flex: 1; background: radial-gradient(ellipse at 48% 44%, #1c3c40 0%, #10292e 65%, #0e242a 100%); color: #e3eeea; isolation: isolate; overflow: hidden; }
+.scene-heading { position: absolute; z-index: 2; inset: 26px 27px auto; display: flex; justify-content: space-between; align-items: flex-start; gap: 15px; pointer-events: none; }
+.scene-eyebrow { display: flex; align-items: center; gap: 7px; font-size: 9px; letter-spacing: 1.6px; color: #9ab7b4; font-weight: 500; }
+.live-dot { width: 5px; height: 5px; border-radius: 100%; background: #a7d5ad; box-shadow: 0 0 10px #98ceaa66; }
+.scene-heading h2 { font-size: 15px; font-weight: 450; margin-top: 8px; letter-spacing: 0.1px; }
+.camera-controls { display: flex; background: #ffffff06; border: 1px solid #ffffff14; border-radius: 6px; pointer-events: auto; }
+.camera-controls button { display: grid; place-items: center; border: 0; background: none; color: #bad1ce; width: 34px; height: 34px; }
+.camera-controls button:hover { background: #ffffff10; }
+.camera-controls .icon { height: 17px; width: 17px; }
+.scene-host { position: absolute; inset: 0; }
+.scene-host canvas { display: block; width: 100%; height: 100%; cursor: grab; touch-action: none; }
+.scene-host canvas:active { cursor: grabbing; }
+.scene-host canvas:focus-visible { outline-offset: -4px; }
+.charge-marker { position: absolute; padding: 4px 8px; border: 1px solid #f4b58a29; background: #132c30c9; border-radius: 4px; color: #f4c09c; font-family: "Consolas", monospace; font-size: 11px; white-space: nowrap; transform: translateX(-50%); pointer-events: none; }
+[data-polarity="negative"] .charge-marker { color: #a4caff; border-color: #85bafa30; }
+[data-polarity="neutral"] .charge-marker { color: #c3d1d0; }
+.scene-status { position: absolute; top: 99px; left: 27px; padding: 5px 8px; font-size: 10px; color: #b4c9bd; border: 1px solid #addbb324; border-radius: 4px; background: #cee4d207; pointer-events: none; }
+.scene-status::before { content: ''; display: inline-block; height: 4px; width: 4px; background: currentColor; border-radius: 50%; margin-right: 6px; vertical-align: middle; }
+.scene-status[data-status="boundary"] { color: #f2c387; }
+.scene-bottom { position: absolute; inset: auto 26px 20px; display: flex; flex-direction: column; gap: 14px; pointer-events: none; }
+.legend { display: flex; gap: 17px; flex-wrap: wrap; font-size: 10px; color: #b2c6c2; }
+.legend > span { display: inline-flex; align-items: center; gap: 6px; }
+.legend i { width: 15px; height: 2px; display: inline-block; }
+.legend-field { background: #f4b58a; }
+[data-polarity="negative"] .legend-field { background: #85bafa; }
+[data-polarity="neutral"] .legend-field { background: #a1b3b4; }
+.legend-surface { border-top: 1px dashed #6fc9bb; }
+.legend-normal { background: #d9e8d2; }
+.scene-bottom > p { color: #88a5a6; font-size: 10px; display: flex; align-items: center; gap: 6px; }
+.scene-bottom > p .icon { width: 14px; height: 14px; }
+.graphics-error { position: absolute; top: 42%; left: 10%; right: 10%; padding: 20px; border: 1px solid #9db7b6; background: #173137; line-height: 1.7; font-size: 14px; border-radius: 7px; }
+.readings { display: grid; grid-template-columns: 1fr 1fr 1.22fr; padding: 22px 25px; border-top: 1px solid #dde4df; background: #fdfefb; gap: 20px; }
+.reading { display: flex; flex-direction: column; gap: 8px; min-width: 0; }
+.reading + .reading { padding-left: 22px; border-left: 1px solid var(--border); }
+.reading > span { color: var(--muted); font-size: 11px; display: flex; align-items: baseline; gap: 6px; }
+.reading i { font-family: Georgia, serif; color: #7d8d84; }
+.reading strong { font-family: "Consolas", "SFMono-Regular", monospace; font-size: clamp(15px, 1.6vw, 21px); font-weight: 400; letter-spacing: -0.7px; color: #354c42; white-space: nowrap; }
+.reading-flux strong { color: #247e65; }
+.controls { padding: 25px 25px 17px; border-left: 1px solid var(--border); }
+.controls-intro h2 { font-size: 15px; font-weight: 600; letter-spacing: -0.2px; }
+.controls-intro p { font-size: 11px; color: var(--muted); line-height: 1.6; margin-top: 5px; margin-bottom: 23px; }
+.range-control { margin-top: 18px; }
+.control-heading { display: flex; align-items: center; justify-content: space-between; gap: 8px; font-size: 12px; }
+.control-heading label { font-weight: 550; }
+.symbol { color: #859489; font-family: Georgia, serif; font-style: italic; font-size: 14px; margin-left: 5px; }
+.control-heading output { font-family: "Consolas", monospace; font-size: 11px; background: #edf3ee; color: #33765e; padding: 4px 7px; border-radius: 4px; min-width: 55px; text-align: center; }
+input[type="range"] { display: block; width: 100%; height: 22px; background: transparent; margin: 11px 0 0; appearance: none; cursor: pointer; --progress: 50%; }
+input[type="range"]::-webkit-slider-runnable-track { height: 3px; border-radius: 10px; background: linear-gradient(to right, #6e9983 var(--progress), #e4eae4 var(--progress)); }
+input[type="range"]::-webkit-slider-thumb { appearance: none; width: 14px; height: 14px; border-radius: 50%; background: #fff; border: 3px solid #52816c; margin-top: -5.5px; box-shadow: 0 1px 3px #263e4022; }
+input[type="range"]::-moz-range-track { height: 3px; border-radius: 10px; background: #e4eae4; }
+input[type="range"]::-moz-range-progress { height: 3px; background: #6e9983; }
+input[type="range"]::-moz-range-thumb { width: 9px; height: 9px; border-radius: 50%; background: #fff; border: 3px solid #52816c; }
+.range-limits { display: flex; justify-content: space-between; font-family: "Consolas", monospace; color: #64756b; font-size: 9px; margin-top: 0; }
+.control-note { font-size: 10px; color: #5f7065; line-height: 1.65; margin-top: 7px; }
+.control-divider { height: 1px; background: #e5eae4; margin: 18px 0; }
+fieldset { border: 0; padding: 0; margin: 0; min-width: 0; }
+legend { font-size: 11px; font-weight: 550; padding: 0; margin-bottom: 10px; }
+.segmented { display: flex; gap: 5px; padding: 4px; background: #f1f4ef; border-radius: 6px; border: 1px solid #e6ebe4; }
+.segmented label { flex: 1; position: relative; cursor: pointer; }
+.segmented input { position: absolute; width: 1px; height: 1px; opacity: 0; }
+.segmented span { display: flex; align-items: center; justify-content: center; gap: 7px; border: 1px solid transparent; border-radius: 4px; padding: 7px 5px; font-size: 11px; color: #63746b; }
+.segmented .icon { width: 16px; height: 16px; }
+.segmented input:checked + span { background: white; border-color: #d3ded3; color: #2b6c54; box-shadow: 0 1px 2px #153c1810; }
+.segmented input:focus-visible + span { outline: 3px solid #428dce; outline-offset: 2px; }
+.layer-controls legend { margin-bottom: 6px; }
+.layer-controls label { position: relative; display: flex; align-items: center; justify-content: space-between; font-size: 11px; line-height: 1.5; padding: 6px 0; color: #5f6e65; cursor: pointer; }
+.layer-controls input { position: absolute; right: 0; width: 29px; height: 17px; opacity: 0; margin: 0; }
+.toggle { width: 28px; height: 16px; border-radius: 20px; background: #d9e1d9; padding: 2px; transition: background 150ms ease; }
+.toggle::before { content: ''; display: block; width: 12px; height: 12px; border-radius: 50%; background: white; box-shadow: 0 1px 2px #0002; transition: transform 150ms ease; }
+.layer-controls input:checked + .toggle { background: #63977b; }
+.layer-controls input:checked + .toggle::before { transform: translateX(12px); }
+.layer-controls input:focus-visible + .toggle { outline: 3px solid #428dce; outline-offset: 3px; }
+.reset-button { width: 100%; display: flex; justify-content: center; align-items: center; gap: 7px; background: #fff; color: #627168; border: 1px solid #dce4dc; border-radius: 5px; padding: 9px; font-size: 11px; margin-top: 17px; }
+.reset-button .icon { width: 14px; height: 14px; }
+.reset-button:hover { background: #f0f5ef; border-color: #b7cbb9; }
+.scenarios { display: flex; align-items: center; flex-wrap: wrap; gap: 9px; margin-top: 19px; }
+.scenarios-label { font-size: 11px; color: #5f7060; margin-right: 7px; }
+.scenario { display: inline-flex; align-items: center; gap: 8px; font-size: 11px; padding: 8px 11px; border: 1px solid #dce3d8; background: #fff9; border-radius: 6px; color: #596d60; }
+.scenario:hover { background: #eaf0e7; }
+.scenario[aria-pressed="true"] { background: #e9f0e5; border-color: #b3c6aa; color: #355b3e; }
+.scenario-symbol { font-size: 13px; font-weight: 500; border-radius: 50%; width: 17px; height: 17px; display: inline-grid; place-items: center; }
+.positive { color: #9c6648; background: #f2e5d7; }
+.negative { color: #48799b; background: #e3ebf3; }
+.scenario .icon { width: 15px; height: 15px; }
+.insight { display: grid; grid-template-columns: 1.2fr 1fr; align-items: center; gap: 30px; padding: 25px 28px; margin-top: 25px; background: #eaf0e5; border: 1px solid #dbe4d3; border-radius: 9px; }
+.insight-copy { display: flex; align-items: flex-start; gap: 15px; }
+.insight-icon { border-radius: 50%; background: #dce7d4; color: #5a7c52; display: grid; place-items: center; width: 37px; height: 37px; flex-shrink: 0; }
+.insight-copy h2 { font-size: 15px; font-weight: 600; color: #3a573b; margin: 0 0 7px; }
+.insight-copy p { font-size: 12px; line-height: 1.85; color: #5d6f58; max-width: 540px; }
+.main-equation { text-align: center; color: #3c604a; padding-left: 20px; border-left: 1px solid #cfdbc8; min-width: 0; }
+.main-equation > .katex { font-size: 1.22em; }
+.main-equation > span:last-child { display: block; font-size: 10px; letter-spacing: 0.2px; margin-top: 14px; color: #596d52; }
+.physics-section { padding-top: 52px; padding-bottom: 32px; }
+.physics-section > h2 { margin-top: 12px; font-size: 30px; font-weight: 500; letter-spacing: -1px; }
+.physics-subtitle { color: var(--muted); font-size: 13px; line-height: 1.8; margin-top: 9px; }
+.lesson-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; margin-top: 25px; }
+.lesson-card { position: relative; border-top: 1px solid #d3dfd3; padding: 24px 20px 15px 0; }
+.lesson-number { font-family: "Consolas", monospace; font-size: 11px; color: #5f7459; }
+.lesson-card h3 { font-size: 16px; font-weight: 550; margin-top: 12px; color: #354e3e; }
+.lesson-formula { color: #537457; margin-top: 23px; margin-bottom: 19px; min-height: 34px; display: flex; align-items: center; }
+.lesson-formula .katex { font-size: 1.12em; }
+.lesson-card p { color: #6c786a; font-size: 12px; line-height: 1.9; max-width: 350px; }
+.try-it { display: flex; align-items: center; gap: 16px; padding: 17px 20px; background: #eef1e9; border-radius: 6px; margin-top: 20px; }
+.try-it > span { color: #566f4b; font-size: 9px; letter-spacing: 1.2px; font-weight: 650; flex-shrink: 0; }
+.try-it p { font-size: 12px; color: #4e6348; }
+.try-it .icon { margin-left: auto; width: 17px; color: #7a8f70; }
+.model-notes { color: #5e6f59; font-size: 11px; margin-top: 25px; line-height: 1.8; }
+.model-notes summary { cursor: pointer; width: fit-content; color: #5d7157; }
+.model-notes summary .icon { width: 14px; height: 14px; margin: 0 5px; }
+.model-notes p { margin-top: 12px; max-width: 920px; }
+.site-footer { max-width: 1304px; margin: 0 auto; padding: 22px 0 30px; border-top: 1px solid var(--border); display: flex; justify-content: space-between; gap: 20px; color: #5f715f; font-size: 10px; }
+.site-footer > span:first-child { display: flex; align-items: center; gap: 8px; }
+.site-footer .icon { width: 18px; height: 18px; }
+.load-error { padding: 100px 20px; text-align: center; }
+.button { margin-top: 20px; padding: 10px 16px; background: #287a6a; border: 0; border-radius: 6px; color: white; }
+
+@media (min-width: 1500px) { .scene-wrap { min-height: 560px; } }
+@media (max-width: 1100px) {
+  .site-header { padding: 0 28px; }
+  main { padding: 0 28px; }
+  .lab { grid-template-columns: minmax(0, 1fr) 285px; }
+  .controls { padding: 24px 20px 17px; }
+  .scene-heading { left: 20px; right: 20px; }
+  .scene-heading h2 { font-size: 13px; }
+  .scene-status { left: 20px; }
+  .scene-bottom { left: 20px; right: 20px; }
+  .readings { padding: 21px 18px; gap: 12px; }
+  .reading + .reading { padding-left: 12px; }
+  .reading > span { font-size: 10px; }
+  .insight { gap: 20px; padding: 22px; }
+  .main-equation > .katex { font-size: 1.03em; }
+  .site-footer { margin-left: 28px; margin-right: 28px; }
+}
 @media (max-width: 850px) {
-  .app-header { flex-wrap: wrap; gap: 16px; }
-  .collections { margin-left: auto; }
-  .header-title { flex: 1; }
-  .test-overview { padding: 25px 22px; gap: 20px; }
-  .test-score { gap: 8px 14px; }
+  .brand small, .brand-divider, .topic-tag { display: none; }
+  .site-header { height: 74px; }
+  .intro { padding-top: 32px; }
+  .lab { grid-template-columns: minmax(0, 1fr); }
+  .scene-wrap { height: 480px; flex: none; }
+  .controls { border-left: 0; border-top: 1px solid var(--border); display: grid; grid-template-columns: 1fr 1fr; gap: 0 30px; padding: 24px; }
+  .controls-intro { grid-column: 1 / -1; }
+  .controls-intro p { margin-bottom: 4px; }
+  .controls .control-divider { grid-column: 1 / -1; margin: 20px 0; }
+  .controls .control-note { grid-column: 1 / -1; }
+  .controls .shape-control { align-self: center; }
+  .controls #size { margin-top: 7px; }
+  .controls .shape-control + .range-control { margin-top: 0; }
+  .reset-button { align-self: center; height: fit-content; }
+  .reading strong { font-size: 20px; }
+  .reading > span { font-size: 11px; }
+  .insight { grid-template-columns: 1fr; }
+  .main-equation { border-left: 0; border-top: 1px solid #cfdbc8; padding: 20px 0 0; }
+  .main-equation > .katex { font-size: 1.2em; }
+  .lesson-grid { gap: 18px; }
+  .lesson-card h3 { font-size: 14px; }
 }
-@media (max-width: 600px) {
-  .app-header { padding: 16px 20px; }
-  .collections { width: 100%; margin: 0; flex-wrap: wrap; }
-  .collections a { flex: 1; text-align: center; }
-  .language-picker { flex: 1 0 100%; margin: 4px 0 0; padding: 8px 4px 4px; border-left: 0; border-top: 1px solid var(--border); }
-  .test-overview { align-items: flex-start; flex-direction: column; gap: 18px; padding: 24px 20px; }
-  .test-score { display: flex; align-items: center; flex-wrap: wrap; gap: 16px; }
-  .test-score > span { font-size: 9px; }
-  .observation { padding: 18px 20px; }
-  .test-study { padding: 26px 20px; }
-  .solution-heading { align-items: flex-start; flex-direction: column; }
-  .derivation { padding-left: 35px; padding-right: 14px; }
-  .derivation .math-step { font-size: 13px !important; padding: 10px; }
-  .prediction { padding: 19px; }
-  .lesson-pagination a { font-size: 11px; }
+@media (max-width: 560px) {
+  .site-header { padding: 0 19px; }
+  .brand > span:first-of-type { font-size: 24px; }
+  .brand > .icon { width: 29px; height: 29px; }
+  .site-header nav { gap: 15px; }
+  .nav-link { font-size: 11px; }
+  .model-number { display: none; }
+  main { padding: 0 16px; }
+  .intro { padding: 28px 2px 25px; }
+  .eyebrow { font-size: 8px; letter-spacing: 1.5px; }
+  h1 { font-size: 32px; letter-spacing: -1.3px; max-width: 300px; }
+  .subtitle { font-size: 12px; }
+  .scene-wrap { height: 420px; min-height: 420px; }
+  .scene-heading { top: 20px; left: 18px; right: 15px; gap: 8px; }
+  .scene-heading h2 { font-size: 12px; max-width: 180px; line-height: 1.6; }
+  .scene-eyebrow { font-size: 7px; letter-spacing: 1px; }
+  .camera-controls button { width: 29px; height: 29px; }
+  .camera-controls .icon { width: 14px; }
+  .scene-status { left: 18px; top: 83px; font-size: 9px; }
+  .scene-bottom { left: 18px; right: 18px; bottom: 16px; }
+  .legend { gap: 9px; font-size: 9px; }
+  .scene-bottom > p { font-size: 9px; }
+  .readings { gap: 8px; padding: 18px 13px; grid-template-columns: 0.85fr 0.85fr 1.3fr; }
+  .reading { gap: 7px; }
+  .reading + .reading { padding-left: 8px; }
+  .reading > span { font-size: 9px; display: block; line-height: 1.6; }
+  .reading > span i { display: none; }
+  .reading strong { font-size: 13px; letter-spacing: -0.7px; }
+  .controls { display: block; padding: 23px; }
+  .controls .shape-control + .range-control { margin-top: 20px; }
+  .controls .control-note { font-size: 11px; }
+  .control-heading { font-size: 13px; }
+  .layer-controls label { padding: 9px 0; font-size: 12px; }
+  .reset-button { margin-top: 20px; padding: 12px; }
+  .scenarios { gap: 7px; }
+  .scenarios-label { flex-basis: 100%; margin: 3px 0; }
+  .scenario { padding: 8px; font-size: 10px; gap: 5px; }
+  .insight { padding: 20px 18px; }
+  .insight-copy { gap: 10px; }
+  .insight-icon { width: 28px; height: 28px; }
+  .insight-icon .icon { width: 18px; }
+  .insight-copy h2 { font-size: 14px; }
+  .main-equation > .katex { font-size: 1.05em; }
+  .physics-section { padding: 37px 4px 25px; }
+  .physics-section > h2 { font-size: 27px; }
+  .physics-subtitle { font-size: 12px; }
+  .lesson-grid { grid-template-columns: 1fr; gap: 8px; }
+  .lesson-card { padding: 20px 3px 15px; }
+  .lesson-card h3 { font-size: 17px; margin-top: 9px; }
+  .lesson-card p { max-width: none; }
+  .lesson-formula { margin: 19px 0 14px; }
+  .try-it { gap: 10px; padding: 14px; }
+  .try-it p { font-size: 11px; }
+  .site-footer { flex-direction: column; gap: 12px; margin: 0 20px; padding: 20px 0 25px; }
 }
-details p { font-size: 11px !important; }
-.webgl-error { position: absolute; z-index: 2; top: 140px; left: 12%; right: 12%; padding: 24px; background: #1e2937; border: 1px solid #ff967b; border-radius: 8px; color: #ffb79f; font-size: 14px; line-height: 1.7; }
-@media (min-width: 1600px) { main { grid-template-columns: 340px minmax(0, 1fr); } .controls-panel { padding: 32px; } }
-@media (max-width: 1100px) { .app-header { padding: 16px 24px; } .subjects { padding: 0 12px; } [role='tab'] { padding: 18px 12px; } main { grid-template-columns: 280px minmax(0, 1fr); } .controls-panel { padding: 24px 20px; } .learning-panel { grid-template-columns: 1fr; gap: 24px; padding: 25px; } .challenge { border-left: 0; border-top: 1px solid var(--border); padding: 22px 0 0; } }
-@media (max-width: 760px) {
-  .app-header { padding: 16px; gap: 13px; min-height: 88px; }
-  .brand { font-size: 15px; padding: 12px 8px; }
-  h1 { font-size: 15px; }
-  .header-title p { font-size: 10px; }
-  .status { display: none; }
-  main { display: flex; flex-direction: column; }
-  .controls-panel { border-right: 0; border-bottom: 1px solid var(--border); padding: 24px; }
-  h2 { font-size: 25px; }
-  #parameters { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 24px; }
-  .parameter { min-width: 0; margin: 10px 0 15px; }
-  .parameter-label { flex-wrap: wrap; gap: 6px; }
-  .measurements { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 16px; margin-top: 18px; }
-  .measurement { min-width: 0; }
-  .measurement strong { font-size: 21px; overflow-wrap: anywhere; }
-  .measurement > div { flex-wrap: wrap; gap: 4px; }
-  .measurement:nth-child(2) { border-top: 0; }
-  #viewport { height: 520px; }
-  .scene-toolbar { top: 18px; left: 16px; right: 16px; }
-  .scene-toolbar button { font-size: 10px; padding: 7px; }
-  .legend { left: 16px; right: 16px; }
-  .scene-footer { padding: 20px 16px 12px; }
-  .learning-panel { padding: 24px; }
+@media (prefers-reduced-motion: reduce) {
+  html { scroll-behavior: auto; }
+  *, *::before, *::after { transition: none !important; }
 }