/* =====================================================================
   layout.css — Reset, base elements, page scaffolding
   ===================================================================== */

*, *::before, *::after { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: 1.5;
  color: var(--text-default);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  /* Desktop: a fixed-height app shell so the board fills the remaining
     viewport and only the columns scroll internally — no sticky stacking,
     so nothing can overlap on scroll. Mobile reverts to page scroll
     (see responsive.css). Fixed/absolute overlays (modals, toasts, login,
     context menu) are out of flow and unaffected. */
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

h1, h2, h3, h4, p { margin: 0; }

button {
  font-family: inherit;
  font-size: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

input, select, textarea { font-family: inherit; }

/* Custom scrollbars — subtle, enterprise feel */
*::-webkit-scrollbar { width: 10px; height: 10px; }
*::-webkit-scrollbar-track { background: transparent; }
*::-webkit-scrollbar-thumb {
  background: var(--color-border-strong);
  border-radius: var(--radius-pill);
  border: 2px solid transparent;
  background-clip: content-box;
}
*::-webkit-scrollbar-thumb:hover { background: var(--text-faint); background-clip: content-box; }
* { scrollbar-width: thin; scrollbar-color: var(--color-border-strong) transparent; }

/* Skip link (a11y) */
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  z-index: var(--z-modal);
  background: var(--color-primary);
  color: #fff;
  padding: var(--sp-2) var(--sp-4);
  border-radius: 0 0 var(--radius-sm) 0;
}
.skip-link:focus { left: 0; }

/* Connection / demo banner */
.banner {
  margin: var(--sp-3) var(--sp-6) 0;
  padding: var(--sp-3) var(--sp-4);
  border-radius: var(--radius);
  font-size: var(--fs-md);
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  border: 1px solid var(--color-warning);
  background: var(--color-warning-soft);
  color: #8a6d00;
}
.banner.banner-danger {
  border-color: var(--color-danger);
  background: var(--color-danger-soft);
  color: #842029;
}
.banner.banner-info {
  border-color: var(--color-info);
  background: var(--color-info-soft);
  color: #0c5460;
}
.banner button.banner-action {
  margin-left: auto;
  font-weight: var(--fw-semibold);
  text-decoration: underline;
}

/* Main board area takes remaining height */
.board-wrap {
  flex: 1;
  min-height: 0;            /* allow the flex child to shrink so columns scroll */
  display: flex;
  padding: var(--sp-6);
}

/* Footer credit */
.app-footer {
  flex: none;
  text-align: center;
  padding: var(--sp-3) var(--sp-6);
  border-top: 1px solid var(--color-border);
  background: var(--color-card);
  font-size: var(--fs-sm);
  color: var(--text-muted);
}
.footer-name {
  color: var(--color-primary);
  font-weight: var(--fw-semibold);
  text-decoration: none;
  transition: color var(--t-fast);
}
.footer-name:hover { color: var(--color-primary-hover); text-decoration: underline; }
.footer-name:focus-visible { outline: none; box-shadow: var(--shadow-focus); border-radius: 3px; }
.footer-sep { color: var(--text-faint); margin: 0 var(--sp-2); }