/* ==========================================================================
   Laws of UX — Before/After Examples
   Shared design system. Demo-specific styles live in each page's <style>.
   ========================================================================== */

:root {
  --bg: #f5f6fa;
  --surface: #ffffff;
  --ink: #1c2130;
  --muted: #5b6478;
  --accent: #4f46e5;
  --accent-soft: #eef0fe;
  --accent-ink: #ffffff;
  --danger: #dc2626;
  --danger-soft: #fdeaea;
  --ok: #15803d;
  --ok-soft: #e8f6ec;
  --warn: #b45309;
  --warn-soft: #fdf3e3;
  --border: #e3e6ef;
  --radius: 12px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .06), 0 4px 16px rgba(16, 24, 40, .07);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 { line-height: 1.2; margin: 0 0 .5rem; }
p { margin: 0 0 1rem; }
a { color: var(--accent); }

.container { max-width: 960px; margin: 0 auto; padding: 0 1.25rem; }

/* --------------------------------------------------------------------------
   Site chrome
   -------------------------------------------------------------------------- */

.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 20;
}

.site-header .container {
  display: flex;
  align-items: center;
  gap: 1rem;
  min-height: 3.5rem;
}

.site-header .brand {
  font-weight: 700;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -.01em;
}

.site-header .brand span { color: var(--accent); }

.site-header .back {
  font-size: .9rem;
  text-decoration: none;
  color: var(--muted);
}

.site-header .back:hover { color: var(--accent); }

.site-header .github {
  margin-left: auto;
  font-size: .9rem;
  text-decoration: none;
  color: var(--muted);
}

.site-header .github:hover { color: var(--accent); }

.site-footer {
  margin: 4rem 0 2rem;
  text-align: center;
  color: var(--muted);
  font-size: .85rem;
}

/* --------------------------------------------------------------------------
   Index page
   -------------------------------------------------------------------------- */

.hero { padding: 3.5rem 0 1.5rem; }

.hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  letter-spacing: -.02em;
  max-width: 32ch;
}

.hero p { color: var(--muted); max-width: 60ch; font-size: 1.05rem; }

/* Audience value section (below the law grid) */

.audience { padding: 1.5rem 0 1rem; }

.audience h2 {
  font-size: 1.35rem;
  letter-spacing: -.01em;
  margin-bottom: 1rem;
}

.aud-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}

.aud-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.2rem 1.4rem;
  box-shadow: var(--shadow);
}

.aud-card h3 { font-size: 1rem; margin-bottom: .45rem; }

.aud-card p { color: var(--muted); font-size: .92rem; margin: 0; }

.law-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
  padding: 1.5rem 0 2rem;
}

.law-card {
  display: flex;
  flex-direction: column;
  gap: .4rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1.2rem 1.2rem;
  text-decoration: none;
  color: var(--ink);
  box-shadow: var(--shadow);
  transition: transform .12s ease, border-color .12s ease;
}

.law-card:hover { transform: translateY(-2px); border-color: var(--accent); }

/* Card illustration — original artwork from lawsofux.com (© Jon Yablonski, CC BY-NC-ND 4.0) */
.law-card .card-art {
  display: block;
  margin: -1.1rem -1.2rem .6rem;
  border-radius: calc(var(--radius) - 1px) calc(var(--radius) - 1px) 0 0;
  overflow: hidden;
}

.law-card .card-art {
  aspect-ratio: 1;
}

.law-card .card-art img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.law-card h2 { font-size: 1.05rem; margin: 0; }

.law-card p { color: var(--muted); font-size: .88rem; margin: 0; }

/* --------------------------------------------------------------------------
   Shared bits
   -------------------------------------------------------------------------- */

/* --------------------------------------------------------------------------
   Law page
   -------------------------------------------------------------------------- */

.law-intro {
  padding: 3rem 0 1rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr) clamp(130px, 18vw, 190px);
  column-gap: 2.5rem;
}

.law-intro > *:not(.law-art) { grid-column: 1; }

/* Law illustration — original artwork from lawsofux.com (© Jon Yablonski, CC BY-NC-ND 4.0) */
.law-intro .law-art {
  grid-column: 2;
  grid-row: 1 / span 4;
  align-self: center;
  border-radius: var(--radius);
  padding: 1.1rem;
  box-shadow: var(--shadow);
}

.law-intro .law-art img { display: block; width: 100%; height: auto; }

@media (max-width: 640px) {
  .law-intro { grid-template-columns: 1fr; }
  .law-intro .law-art { grid-column: 1; grid-row: 1; width: 7.5rem; margin-bottom: 1.2rem; padding: .8rem; }
}

.law-intro h1 { font-size: clamp(1.7rem, 4vw, 2.4rem); letter-spacing: -.02em; }

.law-intro .definition {
  font-size: 1.1rem;
  color: var(--muted);
  max-width: 62ch;
  border-left: 3px solid var(--accent);
  padding-left: 1rem;
  margin: 1rem 0;
}

.law-intro .takeaway { max-width: 68ch; }

.law-intro .source-link { font-size: .85rem; margin: -.4rem 0 1.1rem; padding-left: calc(1rem + 3px); }

/* Before / After toggle */

.toggle {
  display: flex;
  gap: .4rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: .3rem;
  width: fit-content;
  margin: 1.5rem 0 1rem;
  position: sticky;
  top: 4.25rem;
  z-index: 10;
  box-shadow: var(--shadow);
}

.toggle button {
  font: inherit;
  font-weight: 600;
  border: 0;
  background: transparent;
  color: var(--muted);
  border-radius: 999px;
  padding: .45rem 1.2rem;
  cursor: pointer;
}

.toggle button.active[data-panel="before"] { background: var(--danger); color: #fff; }
.toggle button.active[data-panel="after"] { background: var(--ok); color: #fff; }

.panel { margin-bottom: 1rem; }

/* Callout above each demo explaining what to look at */

.callout {
  border-radius: var(--radius);
  padding: .9rem 1.1rem;
  font-size: .95rem;
  margin-bottom: 1rem;
}

.callout.bad { background: var(--danger-soft); color: #7f1d1d; }
.callout.good { background: var(--ok-soft); color: #14532d; }
.callout strong { display: block; margin-bottom: .15rem; }

/* Fake browser frame around each demo */

.demo-frame {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.demo-frame .frame-bar {
  display: flex;
  align-items: center;
  gap: .5rem;
  background: #eceef4;
  border-bottom: 1px solid var(--border);
  padding: .55rem .9rem;
}

.demo-frame .frame-bar .dots { display: flex; gap: .35rem; }

.demo-frame .frame-bar .dots i {
  width: .65rem;
  height: .65rem;
  border-radius: 50%;
  background: #cdd2e0;
}

.demo-frame .frame-bar .url {
  flex: 1;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: .75rem;
  color: var(--muted);
  padding: .15rem .7rem;
  max-width: 22rem;
}

.demo-frame .frame-body { padding: 1.5rem; }

@media (max-width: 600px) {
  .demo-frame .frame-body { padding: 1rem; }
}

/* Explanation blocks under the demos */

.explain {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin: 2rem 0;
}

@media (max-width: 720px) {
  .explain { grid-template-columns: 1fr; }
}

.explain .box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.2rem 1.4rem;
  box-shadow: var(--shadow);
}

.explain h2 { font-size: 1rem; }

.explain ul { margin: .5rem 0 0; padding-left: 1.2rem; }
.explain li { margin-bottom: .45rem; font-size: .95rem; }
.explain .pitch { font-size: .95rem; color: var(--muted); margin: .5rem 0 0; }

/* Prev / next law navigation at the bottom of each law page */

.law-pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: .5rem;
}

.pager-link {
  display: flex;
  flex-direction: column;
  gap: .15rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.3rem;
  box-shadow: var(--shadow);
  text-decoration: none;
  color: var(--ink);
}

.pager-link:hover { border-color: var(--accent); }

.pager-link.next { text-align: right; }

.pager-link .pager-dir { font-size: .8rem; color: var(--muted); }

.pager-link .pager-name { font-weight: 600; }

@media (max-width: 480px) {
  .law-pager { grid-template-columns: 1fr; }
  .pager-link.next { text-align: left; }
}

/* --------------------------------------------------------------------------
   Generic fake-product UI pieces (use inside .frame-body)
   -------------------------------------------------------------------------- */

.btn {
  font: inherit;
  font-weight: 600;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--ink);
  border-radius: 8px;
  padding: .5rem 1rem;
  cursor: pointer;
}

.btn:hover { border-color: var(--accent); }

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
}

.btn-primary:hover { filter: brightness(1.08); }

.btn-ghost { background: transparent; border-color: transparent; color: var(--muted); }

.field { display: flex; flex-direction: column; gap: .3rem; margin-bottom: 1rem; }

.field label { font-size: .85rem; font-weight: 600; }

.field input,
.field select,
.field textarea {
  font: inherit;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: .5rem .75rem;
  background: var(--surface);
  color: var(--ink);
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  border-color: var(--accent);
}

.field .hint { font-size: .78rem; color: var(--muted); }

.error-text { color: var(--danger); font-size: .82rem; }
.ok-text { color: var(--ok); font-size: .82rem; }

.skeleton {
  border-radius: 6px;
  background: linear-gradient(90deg, #edeff5 25%, #f7f8fc 50%, #edeff5 75%);
  background-size: 200% 100%;
  animation: shimmer 1.1s infinite;
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* Small screens */

@media (max-width: 600px) {
  .law-intro { padding-top: 2rem; }
  .toggle { top: 3.75rem; }
}