/* ============================================================
   ASCII Art Tool — Designing with Coding Agents
   Palette: slate (black) · cloud (white) · violet (primary)
            cyan (sole alternative accent, used only for state)
   ============================================================ */
:root {
  --slate:         #15121d;
  --slate-panel:   #1d1830;
  --slate-raised:  #281f3d;

  --cloud:         #f4f1fb;

  --violet:        #8b5cf6;
  --violet-bright: #c4b5fd;
  --violet-deep:   #5b21b6;
  --violet-muted:  #9d8cc9;

  --cyan: #34e0e8;

  --glow: rgba(139, 92, 246, 0.35);

  --ui-display: 'Space Grotesk', system-ui, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  font-family: var(--ui-display);
  background: var(--slate);
  color: var(--cloud);
  overflow: hidden;
}

/* ---- skip link ---- */
.skip-link {
  position: absolute;
  top: -4rem;
  left: 1rem;
  background: var(--violet);
  color: var(--cloud);
  padding: 0.5rem 1rem;
  border-radius: 0 0 0.5rem 0.5rem;
  font-size: 0.875rem;
  text-decoration: none;
  z-index: 200;
  transition: top 0.15s;
}
.skip-link:focus { top: 0; }

/* ---- focus ---- */
:where(a, button, input, select, label[role="button"]):focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* ---- visually hidden ---- */
.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* ---- header ---- */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 1.25rem;
  background: var(--slate-panel);
  border-bottom: 1px solid var(--slate-raised);
  height: 3rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.brand-mark {
  color: var(--violet-bright);
  font-size: 1rem;
  animation: slow-spin 12s linear infinite;
}
@keyframes slow-spin { to { transform: rotate(360deg); } }

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}
.brand-name {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--cloud);
  letter-spacing: 0.01em;
}
.brand-sub {
  font-size: 0.65rem;
  color: var(--violet-muted);
  letter-spacing: 0.04em;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.load-btn {
  display: inline-flex;
  align-items: center;
  padding: 0.35rem 0.85rem;
  background: var(--violet);
  color: var(--cloud);
  border-radius: 0.375rem;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
  letter-spacing: 0.02em;
}
.load-btn:hover { background: var(--violet-bright); color: var(--slate); }

/* ---- main canvas area ---- */
main {
  position: fixed;
  top: 3rem;
  left: 0; right: 0; bottom: 2.25rem;
}

#canvas-container {
  position: relative;
  width: 100%;
  height: 100%;
  outline: none;
}
#canvas-container:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

#canvas-container canvas {
  display: block;
}

/* drag-over highlight */
#canvas-container.drag-over::after {
  content: '';
  position: absolute;
  inset: 0;
  border: 2px dashed var(--cyan);
  pointer-events: none;
}

/* ---- drop hint card ---- */
.drop-hint {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  padding: 2.5rem 3.5rem;
  background: var(--slate-panel);
  border: 1px solid var(--slate-raised);
  border-radius: 1rem;
  text-align: center;
  pointer-events: none; /* card itself doesn't catch clicks */
  transition: opacity 0.25s;
  white-space: nowrap;
}
.drop-hint.hidden {
  opacity: 0;
  pointer-events: none;
}
.drop-icon {
  font-size: 2rem;
  color: var(--violet-bright);
  animation: float 2.4s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(-0.5rem); }
}
.drop-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--cloud);
}
.drop-sub {
  font-size: 0.8rem;
  color: var(--violet-muted);
}
/* button inside the card must receive pointer events */
.card-load-btn {
  pointer-events: auto;
  font-family: var(--ui-display);
  margin-top: 0.25rem;
}

/* ---- footer ---- */
.site-footer {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  height: 2.25rem;
  display: flex;
  align-items: center;
  padding: 0 1.25rem;
  background: var(--slate-panel);
  border-top: 1px solid var(--slate-raised);
  font-size: 0.7rem;
  color: var(--violet-muted);
}

/* ---- Tweakpane theming ---- */
.tp-dfwv {
  --tp-base-background-color:              #1d1830 !important;
  --tp-base-foreground-color:              #f4f1fb !important;
  --tp-accent-color:                       #8b5cf6 !important;

  --tp-button-background-color:            #281f3d !important;
  --tp-button-background-color-hover:      #5b21b6 !important;
  --tp-button-background-color-active:     #8b5cf6 !important;
  --tp-button-background-color-focus:      #5b21b6 !important;
  --tp-button-foreground-color:            #f4f1fb !important;

  --tp-container-background-color:         #281f3d !important;
  --tp-container-background-color-hover:   #1d1830 !important;
  --tp-container-background-color-active:  #15121d !important;
  --tp-container-background-color-focus:   #1d1830 !important;
  --tp-container-foreground-color:         #f4f1fb !important;

  --tp-input-background-color:             #15121d !important;
  --tp-input-background-color-active:      #281f3d !important;
  --tp-input-background-color-focus:       #1d1830 !important;
  --tp-input-background-color-hover:       #1d1830 !important;
  --tp-input-foreground-color:             #c4b5fd !important;

  --tp-label-foreground-color:             #9d8cc9 !important;

  --tp-groove-foreground-color:            #5b21b6 !important;
  --tp-separator-border-color:             #281f3d !important;

  width: 240px !important;
}

/* position pane */
.tp-dfwv {
  position: fixed !important;
  top: 3.75rem !important;
  right: 0.75rem !important;
  z-index: 90 !important;
  border-radius: 0.5rem !important;
  overflow: hidden;
}

/* ---- button reset so <button> matches the label styling ---- */
button.load-btn {
  font-family: var(--ui-display);
  border: none;
}

/* ---- reduced motion ---- */
@media (prefers-reduced-motion: reduce) {
  .brand-mark { animation: none; }
  .drop-icon  { animation: none; }
}

@media (max-width: 560px) {
  .tp-dfwv { width: 200px !important; }
  .brand-sub { display: none; }
}