* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: var(--font-sans);
  color: var(--slate-900);
  background: var(--slate-100);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--dlai-teal); text-decoration: none; }
a:hover { color: var(--dlai-teal-light); }

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  border-radius: var(--radius-sm);
  padding: 10px 16px;
  font-size: 15px;
  font-weight: 500;
  transition: background 120ms var(--easing-in), transform 120ms var(--easing-in);
}
button:active { transform: translateY(1px); }
button:focus-visible {
  outline: 2px solid var(--dlai-coral);
  outline-offset: 2px;
}

.btn-primary {
  background: var(--dlai-coral);
  color: white;
}
.btn-primary:hover { background: var(--dlai-coral-deep); }

.btn-secondary {
  background: white;
  border: 1px solid var(--slate-200);
  color: var(--slate-900);
}
.btn-secondary:hover { background: var(--slate-50); }

input, textarea {
  font-family: inherit;
  font-size: 15px;
  border: 1px solid var(--slate-200);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  width: 100%;
  background: white;
  color: var(--slate-900);
  transition: border-color 140ms var(--easing-in), box-shadow 140ms var(--easing-in);
}
input:focus, textarea:focus {
  outline: none;
  border-color: var(--dlai-coral);
  box-shadow: 0 0 0 4px var(--dlai-coral-bg);
  transform: scale(1.005);
  transition: border-color 140ms var(--easing-in),
              box-shadow 140ms var(--easing-in),
              transform 140ms var(--easing-in);
}
input::placeholder, textarea::placeholder { color: var(--slate-400); }

.app-header {
  background: var(--dlai-coral);
  color: white;
  padding: 0 16px;
  height: 56px;
  display: flex;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 10;
}
.app-header h1 { font-size: 17px; font-weight: 600; margin: 0; }

@media (min-width: 1024px) {
  .app-header { height: 64px; padding: 0 24px; }
  .app-header h1 { font-size: 18px; }
}

.card {
  background: white;
  border: 1px solid var(--slate-200);
  border-radius: var(--radius-md);
  padding: 16px;
  box-shadow: var(--shadow-sm);
}

.muted { color: var(--slate-500); }

.app-footer {
  text-align: center;
  padding: 48px 16px;
  color: var(--slate-500);
  font-size: 13px;
}

/* Sticky-footer layout. Body is a flex column on every page whose <main>
 * grows to fill, pushing the footer to the bottom of the viewport when
 * content is short. position:fixed decorations don't participate in flex,
 * so background orbs / grids still cover the full viewport.
 *
 * Pages whose primary surface already pins something to the viewport bottom
 * (audience-joined view: fixed composer) opt out by setting body.has-fixed-
 * bottom-bar — the footer hides there because stacking it on top of a
 * composer is visually noisy. The "Made with ♥" credit is still visible
 * on the join screen and on every refresh of the audience URL. */
body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
body > main {
  flex: 1;
}
body.is-home > main {
  margin-top: 72px;   /* preserve existing breathing room above the hero */
  margin-bottom: 24px;
}
body.is-home > .app-footer {
  padding: 24px 16px 32px;
}
body.has-fixed-bottom-bar > .app-footer {
  display: none;
}
.app-footer .heart {
  color: var(--dlai-coral);
  display: inline-block;
  animation: heartbeat 1.5s var(--easing-in) infinite;
}
@keyframes heartbeat {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.08); }
}
.app-footer .links { margin-top: 8px; }
.app-footer .links a { color: var(--slate-500); margin: 0 6px; }
.app-footer .author-link {
  color: var(--slate-700);
  font-weight: 500;
  text-decoration: none;
  border-bottom: 1px solid var(--slate-200);
  transition: color 140ms var(--easing-in), border-color 140ms var(--easing-in);
}
.app-footer .author-link:hover {
  color: var(--dlai-coral);
  border-bottom-color: var(--dlai-coral);
}