:root {
  color-scheme: dark;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  --c64-blue: #40318d;
  --c64-light-blue: #7869c4;
  --c64-lightest-blue: #b8b1e7;
  --c64-deep-blue: #17113b;
  --c64-panel-blue: #282064;
  background: var(--c64-deep-blue);
  color: #f6f4ff;
}

* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; background: radial-gradient(circle at top, var(--c64-blue), var(--c64-deep-blue) 42rem); }
.site-header { display: flex; justify-content: space-between; gap: 1rem; padding: 1rem clamp(1rem, 5vw, 4rem); border-bottom: 1px solid #b8b1e733; color: var(--c64-lightest-blue); }
.brand { color: #fff; font-weight: 800; text-decoration: none; }
main { width: min(1100px, calc(100% - 2rem)); margin: 0 auto; padding: clamp(2rem, 6vw, 5rem) 0; }
.panel { max-width: 1100px; margin: auto; }
.eyebrow { margin: 0 0 .5rem; color: var(--c64-lightest-blue); font-size: .75rem; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; }
h1 { margin: 0; font-size: clamp(2rem, 7vw, 4rem); line-height: 1; }
.lede, .hint { max-width: 780px; color: #d2cef0; font-size: 1.08rem; line-height: 1.65; }
.status { margin: 2rem 0 1rem; color: #9ce6c2; }
.library-toolbar { position: sticky; top: 0; z-index: 10; display: flex; flex-wrap: wrap; gap: .65rem; margin: 2rem 0 0; padding: .75rem; border: 1px solid #b8b1e738; border-radius: 12px; background: #17113bef; box-shadow: 0 12px 30px #09062180; backdrop-filter: blur(12px); }
.library-toolbar input, .library-toolbar select { height: 42px; padding: 0 .8rem; border: 1px solid #b8b1e740; border-radius: 8px; background: var(--c64-panel-blue); color: #fff; font: inherit; }
.library-toolbar input:focus, .library-toolbar select:focus { border-color: var(--c64-light-blue); outline: 2px solid #7869c466; }
.library-toolbar input.active-filter, .library-toolbar select.active-filter { border-color: #75d7d0; background: #254f68; color: #fff; box-shadow: inset 0 0 0 1px #75d7d055, 0 0 0 1px #75d7d022; }
.library-toolbar input.active-filter:focus, .library-toolbar select.active-filter:focus { outline-color: #75d7d066; }
.search-field { flex: 1 1 260px; }
.search-field input { width: 100%; }
.view-switcher { display: flex; gap: .25rem; padding: .2rem; border-radius: 8px; background: #100c2c; }
.view-button, .toolbar-button { height: 42px; margin: 0; border: 0; }
.view-button { min-width: 42px; padding: .4rem; background: transparent; color: var(--c64-lightest-blue); font-size: 1.2rem; }
.view-button.active { background: var(--c64-light-blue); color: #fff; }
.toolbar-button { padding: 0 .9rem; }
.reset-button { align-self: center; height: auto; margin: 0; padding: .35rem .45rem; border: 0; background: transparent; color: #aaa5ce; font-size: .78rem; text-decoration: underline; text-decoration-color: transparent; text-underline-offset: .2rem; }
.reset-button:hover { color: #fff; text-decoration-color: currentColor; }
.reset-button.filters-active { color: #75d7d0; }
.reset-button:focus-visible { outline: 2px solid var(--c64-light-blue); outline-offset: 2px; }
.program-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 1rem; }
.program-card { display: flex; min-height: 270px; flex-direction: column; align-items: flex-start; padding: 1.25rem; border: 1px solid #b8b1e733; border-radius: 14px; background: #211a59d9; color: #fff; cursor: pointer; transition: transform .15s, border-color .15s, background .15s; }
.program-card:hover { transform: translateY(-3px); border-color: var(--c64-light-blue); }
.program-card:has(.card-action:hover), .program-card:has(.category-pill:hover) { transform: none; background: #29216bd9; }
.card-badges, .program-badges { display: flex; flex-wrap: wrap; gap: .45rem; align-items: center; }
.category-pill, .language-badge { display: inline-flex; gap: .4rem; align-items: center; min-height: 28px; padding: .3rem .65rem; border-radius: 999px; font-size: .72rem; font-weight: 800; letter-spacing: .04em; line-height: 1; text-transform: uppercase; }
.category-pill { border: 1px solid #b8b1e755; background: #17113b99; color: #d8d3f4; text-decoration: none; transition: background .15s, color .15s, transform .15s; }
.category-pill:hover { border-color: var(--c64-lightest-blue); background: var(--c64-light-blue); color: #fff; transform: translateY(-1px); }
.category-pill:focus-visible { outline: 3px solid #b8b1e788; outline-offset: 2px; }
.language-badge { border: 1px solid #b8b1e755; background: #17113b99; color: #d8d3f4; }
.language-machine-code { border-color: #d98f4588; background: #d98f4526; color: #f4c997; }
.language-basic { border-color: #75a9dc77; background: #75a9dc22; color: #c8e1f7; }
.program-title { margin: 1rem 0 0; font-size: 1.2rem; }
.program-description { margin: .55rem 0 0; color: #d2cef0; font-size: .92rem; line-height: 1.45; }
.release-date { margin: .7rem 0 0; color: #aaa5ce; font-size: .78rem; }
.program-sentinel { height: 1px; }
kbd { min-width: 1.8rem; padding: .25rem .45rem; border: 1px solid var(--c64-light-blue); border-bottom-width: 3px; border-radius: 5px; background: #e9e7f7; color: #211a59; font: 700 .72rem ui-monospace, monospace; text-align: center; }
.program-actions { display: flex; width: 100%; align-items: center; justify-content: space-between; gap: 1rem; margin-top: auto; padding-top: 1.25rem; }
.card-action { display: inline-flex; align-items: center; justify-content: center; gap: .45rem; min-width: 94px; min-height: 38px; margin: 0; padding: .5rem .75rem; border: 1px solid #b8b1e766; border-radius: 8px; background: var(--c64-blue); color: #eeecfa; font: inherit; font-size: .84rem; font-weight: 700; line-height: 1; text-decoration: none; cursor: pointer; transition: color .15s, border-color .15s, background .15s; }
.card-action:hover { border-color: var(--c64-lightest-blue); background: var(--c64-light-blue); color: #fff; }
.card-action:focus-visible { outline: 3px solid #b8b1e788; outline-offset: 2px; }
.card-action:disabled { opacity: .45; cursor: not-allowed; }
.play-icon { font-size: .78rem; }
.code-icon { font: 800 .8rem ui-monospace, monospace; }
.program-grid.list-view { grid-template-columns: 1fr; }
.program-grid.list-view .program-card { min-height: 0; display: grid; grid-template-columns: minmax(180px, auto) minmax(150px, .8fr) minmax(220px, 1.5fr) minmax(110px, auto) minmax(180px, 1fr); align-items: center; gap: 1rem; }
.program-grid.list-view .program-title, .program-grid.list-view .program-description, .program-grid.list-view .release-date, .program-grid.list-view .program-actions { margin: 0; padding: 0; }
.source-modal { width: min(900px, calc(100% - 2rem)); height: min(80vh, 760px); padding: 0; border: 1px solid #b8b1e744; border-radius: 14px; background: var(--c64-deep-blue); color: #fff; box-shadow: 0 30px 80px #000a; }
.source-modal::backdrop { background: #090621d9; backdrop-filter: blur(5px); }
.modal-heading { position: sticky; top: 0; display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 1rem 1.25rem; border-bottom: 1px solid #b8b1e733; background: #17113bf5; }
.modal-heading h2 { margin: 0; }
.icon-button { width: 42px; height: 42px; margin: 0; padding: 0; border-radius: 50%; font-size: 1.7rem; line-height: 1; }
.source-modal > .status { margin: 2rem; }
.source-modal pre { min-height: calc(100% - 82px); margin: 0; padding: 1.5rem; overflow: auto; background: #0d0928; color: #d8d3f4; font: .92rem/1.55 ui-monospace, SFMono-Regular, Consolas, monospace; text-align: left; white-space: pre; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.button, button { display: inline-block; margin-top: 1.5rem; padding: .7rem 1rem; border: 1px solid #b8b1e744; border-radius: 8px; background: var(--c64-blue); color: #fff; font: inherit; text-decoration: none; cursor: pointer; }
button:disabled { opacity: .5; cursor: wait; }
.player-heading { display: flex; align-items: end; justify-content: space-between; gap: 1rem; }
.player-heading h1 { font-size: clamp(1.8rem, 5vw, 3rem); }
.program-badges { margin-top: .85rem; }
.program-page-description { max-width: 760px; margin: 1.5rem 0 0; color: #d2cef0; font-size: 1.08rem; line-height: 1.6; }
.instructions-panel { max-width: 760px; margin: 1.5rem auto 0; padding: 1.1rem 1.25rem; border: 1px solid #b8b1e738; border-radius: 12px; background: #211a59d9; }
.instructions-panel h2 { margin: 0 0 .85rem; font-size: 1rem; letter-spacing: .08em; text-transform: uppercase; }
.control-list { display: grid; gap: .7rem; }
.control-row { display: grid; grid-template-columns: minmax(150px, auto) 1fr; gap: 1rem; align-items: center; color: #d2cef0; }
.key-group { display: flex; flex-wrap: wrap; gap: .35rem; }
#game { width: min(100%, 960px); height: min(75vw, 720px); min-height: 480px; margin: 1.5rem auto 0; background: #000; }
.error { color: #ffb4ab; }
@media (max-width: 600px) {
  .site-header span { display: none; }
  .player-heading { align-items: start; flex-direction: column; }
  .library-toolbar { top: .5rem; }
  .library-toolbar label, .library-toolbar select { flex: 1 1 100%; width: 100%; }
  .program-grid.list-view .program-card { display: flex; }
  .control-row { grid-template-columns: 1fr; gap: .45rem; }
  #game { min-height: 60vh; }
}