:root {
  color-scheme: light;
  --bg: #f7f3ea;
  --paper: #fffdf7;
  --paper-soft: #fbf7ef;
  --ink: #191715;
  --muted: #6d655c;
  --quiet: #9b9186;
  --line: #d7cbbd;
  --hairline: rgba(25, 23, 21, 0.16);
  --accent: #9d2f1f;
  --accent-soft: #ead8d2;
  --good: #396d54;
  --shadow: 0 18px 48px rgba(45, 35, 22, 0.08);
  --radius: 10px;
  --serif: Charter, "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --sans: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    linear-gradient(90deg, rgba(25, 23, 21, 0.035) 1px, transparent 1px) 0 0 / 84px 84px,
    linear-gradient(180deg, rgba(25, 23, 21, 0.035) 1px, transparent 1px) 0 0 / 84px 84px,
    var(--bg);
  color: var(--ink);
  font-family: var(--serif);
  line-height: 1.52;
  text-rendering: optimizeLegibility;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: 1rem;
  transform: translateY(-200%);
  background: var(--ink);
  color: white;
  padding: 0.6rem 0.8rem;
  border-radius: 999px;
  z-index: 30;
  font-family: var(--sans);
}
.skip-link:focus { transform: translateY(0); }

main {
  width: min(1180px, calc(100% - 36px));
  margin: 0 auto;
  padding: 48px 0 64px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 44px;
  align-items: end;
  margin-bottom: 30px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--ink);
}

.paper, .eyebrow {
  margin: 0 0 0.55rem;
  color: var(--accent);
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1, h2, h3, p { margin-top: 0; }
h1 {
  max-width: 760px;
  margin-bottom: 0.65rem;
  font-size: clamp(3.1rem, 8vw, 7.2rem);
  font-weight: 500;
  line-height: 0.9;
  letter-spacing: -0.055em;
}
h2 {
  margin-bottom: 0.5rem;
  font-size: clamp(1.45rem, 2.15vw, 2.1rem);
  font-weight: 500;
  line-height: 1.02;
  letter-spacing: -0.025em;
}
h3 { margin-bottom: 0.38rem; font-size: 1.04rem; font-weight: 600; }
.lede {
  max-width: 690px;
  color: #38332e;
  font-size: clamp(1.08rem, 1.7vw, 1.34rem);
}

.hero__card, .panel, .explain {
  background: color-mix(in srgb, var(--paper) 94%, white);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.hero__card {
  display: grid;
  gap: 0.35rem;
  padding: 20px 22px;
  color: var(--muted);
  border-left: 3px solid var(--accent);
  box-shadow: none;
}
.hero__card strong { color: var(--ink); font-size: 1.12rem; font-weight: 600; }

.workspace {
  display: grid;
  grid-template-columns: 348px minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}
.panel { padding: 24px; }
.controls {
  position: sticky;
  top: 16px;
  background-image: linear-gradient(180deg, rgba(157, 47, 31, 0.04), transparent 42%);
}
.drawer-handle { display: none; }
.section-heading p:not(.eyebrow) { color: var(--muted); }
.slider-list { display: grid; gap: 18px; }
.control { display: grid; gap: 7px; }
.control__top { display: flex; justify-content: space-between; gap: 1rem; }
.control strong { font-weight: 600; }
.control output {
  min-width: 2.1rem;
  color: var(--accent);
  font-family: var(--sans);
  font-weight: 750;
  text-align: right;
}
.hint { color: var(--muted); font-size: 0.91rem; }
input[type="range"] {
  width: 100%;
  min-height: 32px;
  accent-color: var(--accent);
}
input[type="range"]:focus-visible { outline: 3px solid rgba(157, 47, 31, 0.22); outline-offset: 5px; }

.demo { min-width: 0; }
.demo__header {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: start;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 14px;
}
.status {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.4rem 0.72rem;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.8rem;
  white-space: nowrap;
}

.prototype {
  --proto-bg: #f9f6ef;
  --proto-panel: #fffdf8;
  --proto-line: #d5cabd;
  --proto-radius: 8px;
  --proto-shadow: 0 8px 24px rgba(50, 39, 26, 0.07);
  overflow: hidden;
  border: 1px solid var(--proto-line);
  border-radius: 12px;
  background: var(--proto-bg);
  transition: border-radius 180ms ease, box-shadow 180ms ease, background 180ms ease;
}
.proto-topbar {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  padding: 15px 18px;
  border-bottom: 1px solid var(--proto-line);
  background: rgba(255, 253, 248, 0.9);
}
.proto-topbar > div { display: flex; align-items: center; gap: 10px; }
.app-mark {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: inset 0 0 0 6px var(--accent-soft);
}
.weather { color: var(--muted); font-size: 0.92rem; }
.proto-grid { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 1px; padding: 1px; background: var(--proto-line); }
.proto-card {
  position: relative;
  min-height: 150px;
  border: 0;
  border-radius: 0;
  background: var(--proto-panel);
  padding: 19px;
  box-shadow: none;
  transition: transform 160ms ease, box-shadow 160ms ease, border-color 160ms ease, background 160ms ease;
}
.card-title-row { display: flex; justify-content: space-between; gap: 10px; align-items: center; }
.chip {
  border-radius: 0;
  padding: 0.18rem 0.42rem;
  background: var(--accent-soft);
  color: var(--accent);
  font-family: var(--sans);
  font-size: 0.73rem;
  font-weight: 750;
}
.primary-action {
  border: 1px solid var(--accent);
  border-radius: 0;
  background: var(--accent);
  color: white;
  padding: 0.72rem 1rem;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
.primary-action:focus-visible, .task-list button:focus-visible { outline: 3px solid rgba(157, 47, 31, 0.22); outline-offset: 3px; }
.metric {
  font-size: clamp(2.9rem, 6vw, 5.1rem);
  line-height: 0.95;
  font-weight: 500;
  letter-spacing: -0.055em;
  color: var(--accent);
}
.task-list { display: grid; gap: 0; padding: 0; margin: 12px 0 0; list-style: none; }
.task-list li { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 10px 0; border-top: 1px solid rgba(25, 23, 21, 0.12); }
.task-list button { border: 1px solid var(--proto-line); background: white; border-radius: 0; padding: 0.35rem 0.55rem; color: var(--muted); cursor: pointer; font-family: var(--sans); font-size: 0.78rem; }
.timeline { display: grid; gap: 10px; margin-top: 12px; }
.timeline__item { display: grid; grid-template-columns: 64px 1fr; gap: 10px; align-items: start; }
.timeline__time { color: var(--accent); font-family: var(--sans); font-weight: 750; font-size: 0.82rem; }
.timeline__bar { min-height: 34px; border-left: 2px solid var(--accent); background: #f4eee5; padding: 7px 10px; }
.wire-label { display: none; }

/* Appearance fidelity */
.prototype[data-appearance="0"], .prototype[data-appearance="1"] {
  --proto-bg: #fff;
  --proto-panel: #fff;
  --proto-line: #171717;
  --proto-radius: 0;
  --proto-shadow: none;
  filter: grayscale(1);
}
.prototype[data-appearance="0"] .app-mark,
.prototype[data-appearance="1"] .app-mark { background: transparent; border: 2px solid #171717; box-shadow: none; }
.prototype[data-appearance="0"] .chip,
.prototype[data-appearance="1"] .chip,
.prototype[data-appearance="0"] .primary-action,
.prototype[data-appearance="1"] .primary-action { background: white; color: #171717; border: 1px solid #171717; }
.prototype[data-appearance="4"], .prototype[data-appearance="5"] { --proto-shadow: 0 12px 34px rgba(50, 39, 26, 0.1); }
.prototype[data-appearance="5"] {
  --proto-bg: #f7efe1;
  --proto-radius: 10px;
}
.prototype[data-appearance="5"] .proto-card { background: linear-gradient(180deg, #fffdf8, #fbf4ea); }

/* Spatial fidelity */
.prototype[data-spatial="0"] .proto-grid,
.prototype[data-spatial="1"] .proto-grid { grid-template-columns: 1fr; }
.prototype[data-spatial="0"] .proto-card,
.prototype[data-spatial="1"] .proto-card { min-height: 96px; }
.prototype[data-spatial="0"] .proto-card > :not(.wire-label),
.prototype[data-spatial="1"] .proto-card > :not(.wire-label) { opacity: 0.28; }
.prototype[data-spatial="0"] .wire-label,
.prototype[data-spatial="1"] .wire-label { display: block; position: absolute; inset: 14px auto auto 14px; font-family: var(--sans); font-weight: 800; }
.prototype[data-spatial="4"] .priority-card,
.prototype[data-spatial="5"] .priority-card { grid-row: span 2; }
.prototype[data-spatial="5"] .proto-grid { grid-template-columns: 1.1fr 0.72fr 0.9fr; }
.prototype[data-spatial="5"] .tasks-card { grid-column: span 2; }

/* Interactivity fidelity */
.prototype[data-interactivity="0"] .primary-action,
.prototype[data-interactivity="1"] .primary-action,
.prototype[data-interactivity="0"] .task-list button,
.prototype[data-interactivity="1"] .task-list button { cursor: default; opacity: 0.72; }
.prototype[data-interactivity="3"] .proto-card:hover,
.prototype[data-interactivity="4"] .proto-card:hover,
.prototype[data-interactivity="5"] .proto-card:hover { transform: translateY(-2px); box-shadow: 0 10px 26px rgba(50, 39, 26, 0.11); }
.prototype[data-interactivity="4"] .task-list li,
.prototype[data-interactivity="5"] .task-list li { cursor: grab; }
.prototype[data-interactivity="5"] .task-list li.dragging { opacity: 0.5; transform: scale(0.98); }

.explain { margin-top: 24px; padding: 28px; }
.explain__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.explain article { border-top: 1px solid var(--ink); padding-top: 14px; }
.explain p { color: var(--muted); }
.note { margin: 18px 0 0; padding-top: 18px; border-top: 1px solid var(--line); font-size: 0.95rem; }

.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  z-index: 40;
  max-width: min(92vw, 440px);
  transform: translate(-50%, 12px);
  opacity: 0;
  pointer-events: none;
  border: 1px solid var(--ink);
  background: rgba(255, 253, 248, 0.96);
  color: var(--ink);
  box-shadow: 0 12px 30px rgba(38, 30, 20, 0.14);
  padding: 0.72rem 0.9rem;
  font-family: var(--sans);
  font-size: 0.88rem;
  transition: opacity 160ms ease, transform 160ms ease;
}
.toast.is-visible { opacity: 1; transform: translate(-50%, 0); }

.is-complete { text-decoration: line-through; color: #74706a; }
.pulse { animation: pulse 360ms ease; }
@keyframes pulse { 50% { transform: scale(1.006); } }

@media (max-width: 900px) {
  main {
    width: min(100% - 24px, 720px);
    padding-top: 28px;
    padding-bottom: 112px;
  }
  .hero, .workspace, .explain__grid { grid-template-columns: 1fr; }
  .hero { gap: 20px; }
  .demo { order: 1; }
  .controls {
    position: fixed;
    z-index: 35;
    left: 0;
    right: 0;
    bottom: 0;
    top: auto;
    max-height: min(78vh, 620px);
    overflow-y: auto;
    border-radius: 18px 18px 0 0;
    border-left: 0;
    border-right: 0;
    border-bottom: 0;
    padding: 54px 18px 18px;
    transform: translateY(calc(100% - 54px));
    transition: transform 220ms ease;
    box-shadow: 0 -18px 46px rgba(45, 35, 22, 0.18);
  }
  .controls[data-open="true"] { transform: translateY(0); }
  .drawer-handle {
    position: absolute;
    inset: 0 0 auto;
    display: grid;
    place-items: center;
    gap: 5px;
    min-height: 54px;
    width: 100%;
    border: 0;
    border-bottom: 1px solid var(--line);
    background: transparent;
    color: var(--ink);
    font-family: var(--sans);
    font-weight: 700;
    cursor: pointer;
  }
  .drawer-grip {
    width: 44px;
    height: 4px;
    border-radius: 999px;
    background: var(--quiet);
  }
  .drawer-label { font-size: 0.82rem; }
  .proto-grid, .prototype[data-spatial="5"] .proto-grid { grid-template-columns: 1fr; }
  .prototype[data-spatial="5"] .tasks-card { grid-column: auto; }
  .demo__header { flex-direction: column; }
  .toast { bottom: 68px; }
  body.drawer-open .toast { bottom: min(80vh, 636px); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
}