/* LeverScope website
   Layout: a single readable column (about 68ch) with wide "bench" rows for live models;
   diagrams use the stock-and-flow vocabulary of the tool itself (boxes = stocks, pipes = flows, amber = surprising links). */
@font-face { font-family: "Atkinson Hyperlegible Next"; src: url(fonts/atkinson-400.woff2) format("woff2"); font-weight: 400; font-style: normal; font-display: swap; }
@font-face { font-family: "Atkinson Hyperlegible Next"; src: url(fonts/atkinson-400-italic.woff2) format("woff2"); font-weight: 400; font-style: italic; font-display: swap; }
@font-face { font-family: "Atkinson Hyperlegible Next"; src: url(fonts/atkinson-700.woff2) format("woff2"); font-weight: 700; font-style: normal; font-display: swap; }
@font-face { font-family: "Bricolage Grotesque"; src: url(fonts/bricolage-var.woff2) format("woff2"); font-weight: 200 800; font-style: normal; font-display: swap; }

:root {
  --paper: #F5F8FC;        /* page ground, cool blue-tinted */
  --card: #FFFFFF;
  --ink: #0E1A2B;
  --ink-2: #44546A;        /* secondary text, 7:1 on paper */
  --line: #D6DEE9;
  --blue: #0A63CF;         /* logo blue, darkened for AA text */
  --blue-soft: #E3EEFC;
  --water: #0C8DB8;        /* stocks and water */
  --water-soft: #D9F1F8;
  --flow: #1E8F57;         /* flows, green of the logo */
  --flow-soft: #DDF4E7;
  --spark: #B86E00;        /* the unexpected link (amber) */
  --spark-soft: #FFF0D6;
  --danger: #B42318;
  --f-display: "Bricolage Grotesque", "Avenir Next", "Segoe UI", system-ui, sans-serif;
  --f-body: "Atkinson Hyperlegible Next", "Atkinson Hyperlegible", Verdana, "Segoe UI", system-ui, sans-serif;
  --f-data: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --step--1: 0.9rem; --step-0: 1.125rem; --step-1: 1.35rem; --step-2: 1.75rem; --step-3: clamp(2rem, 4.5vw, 2.75rem); --step-4: clamp(2.5rem, 7vw, 4.25rem);
  --r: 10px;
  --measure: 68ch;
}
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) {
  --paper: #0D1420; --card: #152033; --ink: #EAF0F8; --ink-2: #A9B7CA; --line: #2A3A52;
  --blue: #6AAEFF; --blue-soft: #16304F; --water: #4CC3E6; --water-soft: #12354A; --flow: #4CD08C; --flow-soft: #123A28;
  --spark: #FFB648; --spark-soft: #3D2C10; --danger: #FF8A80; color-scheme: dark; } }
:root[data-theme="dark"] {
  --paper: #0D1420; --card: #152033; --ink: #EAF0F8; --ink-2: #A9B7CA; --line: #2A3A52;
  --blue: #6AAEFF; --blue-soft: #16304F; --water: #4CC3E6; --water-soft: #12354A; --flow: #4CD08C; --flow-soft: #123A28;
  --spark: #FFB648; --spark-soft: #3D2C10; --danger: #FF8A80; color-scheme: dark; }

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 84px; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--f-body); font-size: var(--step-0); line-height: 1.65; }
img, svg, canvas { max-width: 100%; }
a { color: var(--blue); text-underline-offset: 3px; text-decoration-thickness: 1.5px; }
a:hover { text-decoration-thickness: 3px; }
:focus-visible { outline: 3px solid var(--blue); outline-offset: 3px; border-radius: 4px; }
h1, h2, h3, h4 { font-family: var(--f-display); line-height: 1.12; letter-spacing: -0.015em; text-wrap: balance; margin: 0; font-weight: 700; }
h1 { font-size: var(--step-4); font-weight: 750; letter-spacing: -0.03em; }
h2 { font-size: var(--step-3); }
h3 { font-size: var(--step-1); }
p { margin: 0; text-wrap: pretty; }
.skip { position: absolute; left: 12px; top: -60px; background: var(--ink); color: var(--paper); padding: 10px 16px; border-radius: 8px; z-index: 50; }
.skip:focus { top: 12px; }
.sr { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* frame */
.wrap { width: min(1160px, 100%); margin-inline: auto; padding-inline: clamp(16px, 4vw, 40px); }
.prose { max-width: var(--measure); }
.site-h { position: sticky; top: env(safe-area-inset-top, 0px); z-index: 20; background: color-mix(in srgb, var(--paper) 92%, transparent); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.site-h .wrap { display: flex; align-items: center; gap: 20px; min-height: 68px; flex-wrap: wrap; padding-block: 8px; }
.logo { display: flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font-family: var(--f-display); font-weight: 700; font-size: 1.3rem; letter-spacing: -0.02em; }
.logo svg { width: 38px; height: 33px; }
.logo b { font-weight: 700; color: var(--water); }
.nav { display: flex; gap: 4px; flex-wrap: wrap; margin-left: auto; align-items: center; }
.nav a { color: var(--ink); text-decoration: none; padding: 8px 12px; border-radius: 8px; font-size: 1rem; }
.nav a:hover { background: var(--blue-soft); }
.nav a[aria-current="page"] { background: var(--blue-soft); color: var(--blue); font-weight: 700; }
.nav .btn { margin-left: 6px; }
.theme-t { border: 1px solid var(--line); background: var(--card); color: var(--ink); width: 40px; height: 40px; border-radius: 10px; display: grid; place-items: center; cursor: pointer; }
.theme-t svg { width: 20px; height: 20px; }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 11px 20px; border-radius: 10px; border: 2px solid var(--blue); background: var(--card); color: var(--blue); font: 700 1rem/1.2 var(--f-body); text-decoration: none; cursor: pointer; min-height: 44px; }
.btn:hover { background: var(--blue-soft); text-decoration: none; }
.btn.primary { background: var(--blue); color: var(--paper); }
.btn.primary:hover { filter: brightness(1.08); background: var(--blue); }
.btn.small { padding: 7px 14px; min-height: 38px; font-size: 0.95rem; }
.btn.quiet { border-color: var(--line); color: var(--ink); }

main { display: block; }
section { padding-block: clamp(48px, 8vw, 96px); }
section + section { border-top: 1px solid var(--line); }
.eyebrow { font: 700 0.85rem/1.2 var(--f-body); letter-spacing: 0.08em; text-transform: uppercase; color: var(--water); }
.lead { font-size: var(--step-1); color: var(--ink-2); line-height: 1.5; }
.stack { display: flex; flex-direction: column; gap: 18px; }
.row { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }

/* hero */
.hero { padding-block: clamp(40px, 7vw, 88px) clamp(40px, 6vw, 72px); }
.hero .wrap { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: clamp(28px, 5vw, 64px); align-items: center; }
.hero h1 em { font-style: normal; color: var(--spark); }
.hero .lead { max-width: 34ch; }
@media (max-width: 860px) { .hero .wrap { grid-template-columns: minmax(0, 1fr); } }

/* the bench: a live model in a card */
.bench { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: clamp(16px, 3vw, 24px); display: flex; flex-direction: column; gap: 14px; min-width: 0; box-shadow: 0 1px 0 var(--line), 0 18px 40px -28px color-mix(in srgb, var(--ink) 40%, transparent); }
.bench-h { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; flex-wrap: wrap; }
.bench-h h3 { font-size: 1.15rem; }
.bench-h .tag { font-size: 0.85rem; color: var(--ink-2); }
.bench svg.scene { width: 100%; height: auto; display: block; }
.ctl { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 4px 12px; align-items: center; }
.ctl label { font-weight: 700; font-size: 1rem; }
.ctl output { font-family: var(--f-data); font-size: 0.95rem; font-variant-numeric: tabular-nums; color: var(--ink-2); }
.ctl input[type=range] { grid-column: 1 / -1; width: 100%; accent-color: var(--blue); height: 32px; }
.ctls { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 12px 24px; }
.readout { display: flex; gap: 18px; flex-wrap: wrap; font-size: 0.98rem; color: var(--ink-2); }
.readout b { color: var(--ink); font-family: var(--f-data); font-variant-numeric: tabular-nums; font-weight: 600; }
.chart { width: 100%; height: auto; display: block; }
.chart text { fill: var(--ink-2); font: 12px var(--f-body); }
.chart .grid { stroke: var(--line); stroke-width: 1; }
.chart .axis { stroke: var(--ink-2); stroke-width: 1; }

/* building blocks */
.blocks { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; margin-top: 36px; }
@media (max-width: 860px) { .blocks { grid-template-columns: minmax(0, 1fr); } }
.block { display: grid; grid-template-rows: auto auto 1fr; gap: 10px; }
.block svg { width: 100%; max-width: 260px; height: 84px; }
.block p { color: var(--ink-2); }
.k-stock { color: var(--water); } .k-flow { color: var(--flow); } .k-link { color: var(--spark); }

/* stories: surprising influences */
.stories { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 330px), 1fr)); gap: 18px; margin-top: 32px; }
.story { background: var(--card); border: 1px solid var(--line); border-radius: var(--r); padding: 20px; display: grid; grid-template-rows: auto auto 1fr auto; gap: 10px; color: var(--ink); text-decoration: none; }
a.story:hover { border-color: var(--blue); text-decoration: none; }
.chain { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; font-weight: 700; font-size: 0.98rem; }
.chain span { background: var(--water-soft); padding: 2px 10px; border-radius: 999px; }
.chain i { font-style: normal; color: var(--ink-2); }
.chain i.s { color: var(--spark); }
.chain span.s { background: var(--spark-soft); }
.story p { color: var(--ink-2); font-size: 1rem; }
.story .more { font-weight: 700; color: var(--blue); font-size: 1rem; }

/* audiences */
.aud { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 28px; margin-top: 32px; }
@media (max-width: 860px) { .aud { grid-template-columns: minmax(0, 1fr); } }
.aud h3 { margin-bottom: 8px; }
.aud p { color: var(--ink-2); }

.cta-band { background: var(--ink); color: var(--paper); border-radius: 18px; padding: clamp(24px, 5vw, 48px); display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 24px; align-items: center; }
.cta-band p { color: color-mix(in srgb, var(--paper) 80%, var(--ink)); }
.cta-band .btn.primary { background: var(--paper); color: var(--ink); border-color: var(--paper); }
.cta-band .btn { border-color: color-mix(in srgb, var(--paper) 50%, var(--ink)); color: var(--paper); background: transparent; }
@media (max-width: 760px) { .cta-band { grid-template-columns: minmax(0, 1fr); } }

/* learn chapters */
.chapters { display: grid; grid-template-columns: 240px minmax(0, 1fr); gap: 48px; align-items: start; }
.toc { position: sticky; top: 92px; display: flex; flex-direction: column; gap: 2px; font-size: 1rem; }
.toc a { color: var(--ink-2); text-decoration: none; padding: 6px 10px; border-radius: 8px; border-left: 3px solid transparent; }
.toc a:hover { color: var(--ink); background: var(--blue-soft); }
.toc b { font-family: var(--f-display); font-size: 0.85rem; letter-spacing: .06em; text-transform: uppercase; color: var(--ink-2); padding: 6px 10px; }
@media (max-width: 900px) { .chapters { grid-template-columns: minmax(0, 1fr); } .toc { position: static; flex-direction: row; flex-wrap: wrap; } .toc b { width: 100%; } }
.chapter { display: flex; flex-direction: column; gap: 18px; padding-bottom: 56px; margin-bottom: 56px; border-bottom: 1px solid var(--line); min-width: 0; }
.chapter:last-child { border-bottom: 0; }
.chapter > p, .chapter > ul, .chapter > ol { max-width: var(--measure); }
.chapter .num { font: 700 0.9rem var(--f-body); color: var(--water); letter-spacing: .06em; text-transform: uppercase; }
.try { background: var(--flow-soft); border-radius: var(--r); padding: 16px 20px; max-width: var(--measure); }
.try b:first-child { color: var(--flow); }
.think { background: var(--spark-soft); border-radius: var(--r); padding: 16px 20px; max-width: var(--measure); }
.think b:first-child { color: var(--spark); }
ul.clean, ol.clean { padding-left: 1.2em; display: flex; flex-direction: column; gap: 6px; margin: 0; }
.age { display: inline-block; font-size: 0.85rem; font-weight: 700; color: var(--ink-2); border: 1px solid var(--line); border-radius: 999px; padding: 1px 10px; }
.wordbox { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; max-width: 900px; }
.word { border: 1px solid var(--line); border-radius: var(--r); padding: 14px 16px; background: var(--card); }
.word b { display: block; font-family: var(--f-display); font-size: 1.1rem; }
.word span { color: var(--ink-2); font-size: 1rem; }

/* library */
.lib-tools { display: grid; grid-template-columns: minmax(0, 1fr) auto auto; gap: 12px; align-items: end; margin-top: 28px; }
@media (max-width: 720px) { .lib-tools { grid-template-columns: minmax(0, 1fr); } }
.field { display: flex; flex-direction: column; gap: 6px; font-weight: 700; font-size: 1rem; }
.field input, .field select, .field textarea { font: 400 1.05rem var(--f-body); padding: 11px 14px; border: 2px solid var(--line); border-radius: 10px; background: var(--card); color: var(--ink); min-height: 48px; width: 100%; }
.field textarea { min-height: 120px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus { border-color: var(--blue); outline: none; box-shadow: 0 0 0 3px var(--blue-soft); }
.field small { font-weight: 400; color: var(--ink-2); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.chip { border: 2px solid var(--line); background: var(--card); color: var(--ink); border-radius: 999px; padding: 6px 14px; font: 700 0.95rem var(--f-body); cursor: pointer; min-height: 40px; }
.chip[aria-pressed="true"] { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.chip .n { font-weight: 400; opacity: .75; margin-left: 4px; }
.lib-count { margin-top: 18px; color: var(--ink-2); font-size: 1rem; }
.models { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 320px), 1fr)); gap: 18px; margin-top: 14px; }
.model { background: var(--card); border: 1px solid var(--line); border-radius: var(--r); padding: 20px; display: grid; grid-template-rows: auto auto 1fr auto auto; gap: 10px; min-width: 0; }
.model .meta { display: flex; gap: 8px; flex-wrap: wrap; font-size: 0.85rem; font-weight: 700; }
.model .meta span { padding: 2px 10px; border-radius: 999px; background: var(--water-soft); }
.model .meta span.lvl { background: var(--flow-soft); }
.model p { color: var(--ink-2); font-size: 1rem; }
.model .tags { font-size: 0.88rem; color: var(--ink-2); }
.model .by { font-size: 0.85rem; color: var(--ink-2); }
.model .acts { display: flex; gap: 8px; flex-wrap: wrap; }
.empty { padding: 40px; text-align: center; color: var(--ink-2); border: 2px dashed var(--line); border-radius: var(--r); margin-top: 14px; }

/* forms + panels (PHP pages) */
.panel { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: clamp(20px, 4vw, 36px); max-width: 560px; display: flex; flex-direction: column; gap: 18px; }
.panel.wide { max-width: 900px; }
.notice { padding: 12px 16px; border-radius: 10px; background: var(--blue-soft); font-size: 1rem; }
.notice.ok { background: var(--flow-soft); }
.notice.bad { background: color-mix(in srgb, var(--danger) 14%, var(--card)); color: var(--ink); border-left: 4px solid var(--danger); }
table.list { width: 100%; border-collapse: collapse; font-size: 1rem; }
table.list th, table.list td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--line); vertical-align: top; }
.tbl { overflow-x: auto; }

/* support */
.ways { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 18px; margin-top: 28px; }
.way { background: var(--card); border: 1px solid var(--line); border-radius: var(--r); padding: 22px; display: grid; grid-template-rows: auto 1fr auto; gap: 10px; }
.way p { color: var(--ink-2); font-size: 1rem; }
.compare { width: 100%; border-collapse: collapse; margin-top: 24px; font-size: 1rem; min-width: 520px; }
.compare th, .compare td { padding: 12px 10px; border-bottom: 1px solid var(--line); text-align: left; }
.compare td.y { color: var(--flow); font-weight: 700; }

/* footer */
.site-f { border-top: 1px solid var(--line); padding-block: 40px; font-size: 1rem; color: var(--ink-2); }
.site-f .wrap { display: grid; grid-template-columns: minmax(0, 2fr) repeat(3, minmax(0, 1fr)); gap: 28px; }
.site-f h4 { font-size: 1rem; color: var(--ink); margin-bottom: 8px; }
.site-f ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 4px; }
.site-f a { color: var(--ink-2); }
.site-f .fine { grid-column: 1 / -1; font-size: 0.88rem; border-top: 1px solid var(--line); padding-top: 16px; }
@media (max-width: 760px) { .site-f .wrap { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); } .site-f .wrap > div:first-child { grid-column: 1 / -1; } }

@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; } }