/* Concept demo pages. Each page sets its own palette in a small :root block.
   These are design concepts for imaginary businesses, labelled as such at the top of every page. */

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--d-bg);
  color: var(--d-text);
  font: 400 1rem/1.6 "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  overflow-x: hidden;
}
h1, h2, h3 { margin: 0; font-family: "Space Grotesk", "Inter", system-ui, sans-serif; font-weight: 500; line-height: 1.1; letter-spacing: -0.02em; }
h1 { font-size: clamp(2.25rem, 6vw, 4rem); }
.d-hero h1 { margin-bottom: 1rem; }
h2 { font-size: clamp(1.75rem, 3.6vw, 2.5rem); }
h3 { font-size: 1.25rem; }
p { margin: 0 0 1rem; }
img, svg { max-width: 100%; display: block; }
a { color: inherit; text-underline-offset: 0.2em; }
:focus-visible { outline: 2px solid var(--d-text); outline-offset: 3px; }
[hidden] { display: none !important; }
.visually-hidden { position: absolute; width: 1px; height: 1px; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

.d-container { width: 100%; max-width: 1100px; margin-inline: auto; padding-inline: clamp(1rem, 4vw, 2rem); }

/* The label every concept page carries */
.d-banner { background: #0A0A0B; color: #F5F5F2; font: 500 0.75rem/1.4 "JetBrains Mono", ui-monospace, Consolas, monospace; letter-spacing: 0.04em; }
.d-banner .d-container { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 0.25rem 1.5rem; min-height: 44px; padding-block: 0.3rem; }
.d-banner strong { font-weight: 500; text-transform: uppercase; }
.d-banner a { display: inline-flex; align-items: center; min-height: 44px; color: #F5F5F2; }
.d-banner a:focus-visible { outline-color: #C4F82A; }

.d-nav { border-bottom: 1px solid var(--d-border); }
.d-nav .d-container { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 0.5rem 1.5rem; min-height: 64px; }
.d-logo { font: 700 1.3rem/1 "Space Grotesk", sans-serif; letter-spacing: -0.03em; text-decoration: none; display: inline-flex; align-items: center; min-height: 44px; }
.d-links { display: flex; flex-wrap: wrap; align-items: center; gap: 0 1.25rem; list-style: none; margin: 0; padding: 0; }
.d-links a { display: inline-flex; align-items: center; min-height: 44px; text-decoration: none; color: var(--d-muted); }
.d-links a:hover { color: var(--d-text); text-decoration: underline; }
.d-links .d-btn { color: var(--d-ink); text-decoration: none; }
.d-links .d-btn:hover { color: var(--d-text); }
.d-card summary { display: flex; align-items: center; min-height: 44px; cursor: pointer; }

.d-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 48px;
  padding: 0.7rem 1.4rem;
  border: 2px solid var(--d-accent);
  border-radius: 3px;
  background: var(--d-accent);
  color: var(--d-ink);
  font: 600 1rem/1.1 "Space Grotesk", "Inter", sans-serif;
  text-decoration: none;
  cursor: pointer;
}
.d-btn:hover { background: transparent; color: var(--d-text); border-color: var(--d-text); }
.d-btn--ghost { background: transparent; color: var(--d-text); border-color: var(--d-border-strong); }
.d-btn--ghost:hover { border-color: var(--d-text); }
.d-btn--sm { min-height: 44px; padding: 0.5rem 1rem; }

.d-hero { padding-block: clamp(3rem, 8vw, 6rem); }
.d-hero .d-container { display: grid; gap: 2rem; }
.d-eyebrow { font: 500 0.75rem/1.4 "JetBrains Mono", ui-monospace, monospace; letter-spacing: 0.08em; text-transform: uppercase; color: var(--d-muted); margin-bottom: 1rem; }
.d-lead { font-size: 1.15rem; color: var(--d-muted); max-width: 34rem; }
.d-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 1.5rem; }

.d-section { padding-block: clamp(2.5rem, 6vw, 4.5rem); border-top: 1px solid var(--d-border); }
.d-section > .d-container > h2 { margin-bottom: 1.5rem; }
.d-grid { display: grid; gap: 1rem; }
.d-card { padding: 1.25rem; border: 1px solid var(--d-border); border-radius: 4px; background: var(--d-surface); }
.d-card h3 { margin-bottom: 0.4rem; }
.d-card p { color: var(--d-muted); }
.d-card p:last-child { margin-bottom: 0; }
.d-card .d-btn { margin-top: 0.75rem; }
.d-steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 1rem; counter-reset: s; }
.d-steps li { counter-increment: s; padding-top: 0.75rem; border-top: 1px solid var(--d-border-strong); }
.d-steps li::before { content: "0" counter(s); display: block; margin-bottom: 0.25rem; font: 500 0.75rem/1 "JetBrains Mono", monospace; color: var(--d-muted); }
.d-steps b { display: block; font-family: "Space Grotesk", sans-serif; font-weight: 500; font-size: 1.1rem; }
.d-steps span { color: var(--d-muted); }

.d-field { display: grid; gap: 0.4rem; margin-bottom: 1rem; }
.d-field label { font-weight: 500; font-size: 0.95rem; }
.d-field input, .d-field textarea, .d-field select { width: 100%; min-height: 48px; padding: 0.7rem 0.85rem; border: 1px solid var(--d-border-strong); border-radius: 3px; background: var(--d-bg); color: var(--d-text); font: inherit; }
.d-field textarea { min-height: 120px; resize: vertical; }
.d-note { margin-top: 1rem; padding: 0.75rem 1rem; border-left: 3px solid var(--d-accent); background: var(--d-surface); font-size: 0.95rem; }

.d-slots { display: grid; grid-template-columns: repeat(auto-fill, minmax(5.5rem, 1fr)); gap: 0.5rem; margin-bottom: 1.25rem; }
.d-slot { min-height: 48px; border: 1px solid var(--d-border-strong); border-radius: 3px; background: var(--d-bg); color: var(--d-text); font: 500 1rem "Inter", sans-serif; cursor: pointer; }
.d-slot:hover { border-color: var(--d-text); }
.d-slot[aria-pressed="true"] { background: var(--d-accent); border-color: var(--d-accent); color: var(--d-ink); }
.d-slot[disabled] { color: var(--d-muted); text-decoration: line-through; cursor: not-allowed; opacity: 0.7; }
.d-day { margin: 0 0 0.5rem; font: 500 0.8rem "JetBrains Mono", monospace; color: var(--d-muted); text-transform: uppercase; letter-spacing: 0.06em; }

.d-footer { padding-block: 2rem; border-top: 1px solid var(--d-border); color: var(--d-muted); font-size: 0.9rem; }
.d-footer .d-container { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 0.5rem 2rem; }
.d-footer p { margin: 0; }

@media (min-width: 760px) {
  .d-hero .d-container { grid-template-columns: 1.2fr 1fr; align-items: center; gap: 3rem; }
  .d-grid--3 { grid-template-columns: repeat(3, 1fr); }
  .d-grid--2 { grid-template-columns: repeat(2, 1fr); }
  .d-grid--4 { grid-template-columns: repeat(4, 1fr); }
  .d-steps { grid-template-columns: repeat(3, 1fr); }
  .d-two { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; align-items: start; }
}

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }