/* ========================================
   Riso Preview — styling adapted from shellylynnx.com
   ======================================== */

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

:root {
  --color-bg: #1A1714;
  --color-bg-alt: #211e1a;
  --color-text: #E8E0D4;
  --color-text-secondary: #b5ad9e;
  --color-text-dim: #6B6358;
  --color-accent: #345A40;
  --color-accent-hover: #2a4a34;
  --color-secondary: #C8A54E;
  --color-highlight: #E48B47;
  --color-border: #3a352f;
  --color-card-bg: #211e1a;
  --color-error: #8B2500;
  --font-body: "Inter", system-ui, -apple-system, sans-serif;
  --font-display: "Playfair Display", Georgia, serif;
  --max-width: 960px;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  background: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.3s, color 0.3s;
}

body.light {
  --color-bg: #F5F0E8;
  --color-bg-alt: #EBE6DC;
  --color-text: #1A1714;
  --color-text-secondary: #4a4640;
  --color-text-dim: #8a8478;
  --color-border: #d4cfc6;
  --color-card-bg: #EBE6DC;
  --color-secondary: #8a6b20;
  --color-highlight: #B8571F;
}

/* ── Header ──────────────────────────────────────────────────── */
header {
  text-align: center;
  padding: 3rem 1.5rem 1.5rem;
}

h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: 0.01em;
  color: var(--color-text);
}

.tagline {
  font-size: 1rem;
  color: var(--color-text-dim);
  margin-top: 0.5rem;
  font-style: italic;
  letter-spacing: 0.02em;
}

main {
  flex: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem 2.5rem;
  width: 100%;
}

/* ── View bar ────────────────────────────────────────────────── */
#view-bar {
  margin-bottom: 1rem;
  padding: 0.75rem 1.25rem;
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 6px;
}
.view-bar-inner {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}
.view-bar-label {
  color: var(--color-text-secondary);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}
.view-layer-toggle {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  cursor: pointer;
}
.view-layer-toggle input[type="checkbox"] {
  accent-color: var(--color-secondary);
  width: 15px;
  height: 15px;
}
.view-layer-name {
  color: var(--color-text);
  font-size: 0.875rem;
  letter-spacing: 0.02em;
}

/* ── Upload zone ─────────────────────────────────────────────── */
.upload-zone {
  border: 1.5px dashed var(--color-border);
  border-radius: 6px;
  padding: 3.5rem 2rem;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  position: relative;
  overflow: hidden;
  background: var(--color-card-bg);
}
.upload-zone:hover,
.upload-zone:focus-visible,
.upload-zone.dragover {
  border-color: var(--color-secondary);
  background: var(--color-bg-alt);
  outline: none;
}
.upload-zone.has-image {
  border-style: solid;
  border-color: var(--color-border);
  padding: 0;
  cursor: default;
}
.upload-zone.has-image canvas#source-canvas {
  display: block;
  width: 100%;
  height: auto;
}
.upload-zone.mask-active {
  cursor: crosshair;
}
.upload-icon {
  font-family: var(--font-display);
  font-size: 2.5rem;
  color: var(--color-secondary);
  margin-bottom: 0.75rem;
}
.upload-text {
  font-size: 1rem;
  color: var(--color-text);
}
.upload-hint {
  font-size: 0.8125rem;
  color: var(--color-text-dim);
  font-style: italic;
  margin-top: 0.4rem;
  letter-spacing: 0.02em;
}

#mask-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}
.upload-zone.mask-active #mask-overlay {
  pointer-events: auto;
  cursor: crosshair;
}

/* ── Mask toolbar ────────────────────────────────────────────── */
#mask-section {
  margin-top: 1.5rem;
  padding: 1rem 1.25rem;
  background: var(--color-card-bg);
  border-radius: 6px;
  border: 1px solid var(--color-border);
}
.mask-toolbar {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}
.mask-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}
.mask-field {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  color: var(--color-text);
}
.mask-field-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-text-secondary);
}
.mask-val {
  font-size: 0.75rem;
  color: var(--color-text-dim);
  min-width: 1.5em;
  text-align: center;
}
.mask-hint {
  font-size: 0.8125rem;
  color: var(--color-text-dim);
  font-style: italic;
  margin-top: 0.5rem;
}
.mask-tool-group {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.btn-sm {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  padding: 0.4rem 0.9rem;
  border: 1px solid var(--color-border);
  border-radius: 3px;
  cursor: pointer;
  background: transparent;
  color: var(--color-text-secondary);
  transition: all 0.2s;
}
.btn-sm:hover {
  border-color: var(--color-text-secondary);
  color: var(--color-text);
}
.btn-sm.active {
  background: var(--color-secondary);
  color: var(--color-bg);
  border-color: var(--color-secondary);
}

/* ── Controls ────────────────────────────────────────────────── */
#controls {
  margin-top: 1.75rem;
}
.control-group {
  display: flex;
  gap: 2rem;
  align-items: flex-start;
  flex-wrap: wrap;
  margin-bottom: 1.25rem;
}
.control-col {
  flex: 1;
  min-width: 180px;
}
.control-label {
  display: block;
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.75rem;
}
.control-label::after {
  content: '';
  display: block;
  width: 28px;
  height: 2px;
  background: var(--color-secondary);
  margin-top: 8px;
}

.swatch-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.swatch {
  width: 28px;
  height: 28px;
  border-radius: 3px;
  border: 2px solid transparent;
  cursor: pointer;
  transition: border-color 0.15s, transform 0.15s;
  position: relative;
}
.swatch:hover {
  transform: scale(1.12);
}
.swatch.active {
  border-color: var(--color-secondary);
  box-shadow: 0 0 0 2px var(--color-bg), 0 0 0 4px var(--color-secondary);
}
.swatch[title]:hover::after {
  content: attr(title);
  position: absolute;
  bottom: -24px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.6875rem;
  white-space: nowrap;
  color: var(--color-text);
  background: var(--color-card-bg);
  padding: 2px 6px;
  border-radius: 3px;
  border: 1px solid var(--color-border);
  pointer-events: none;
  z-index: 10;
}

.toggle-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-top: 0.75rem;
  cursor: pointer;
}
.toggle-label input[type="checkbox"] {
  accent-color: var(--color-secondary);
  width: 15px;
  height: 15px;
}

select {
  font-family: var(--font-body);
  font-size: 0.875rem;
  padding: 0.45rem 0.7rem;
  border: 1px solid var(--color-border);
  border-radius: 3px;
  background: var(--color-card-bg);
  color: var(--color-text);
  cursor: pointer;
  letter-spacing: 0.02em;
}
select:focus {
  outline: none;
  border-color: var(--color-secondary);
}

input[type="range"] {
  accent-color: var(--color-secondary);
  width: 100px;
}

/* ── Preview canvases ────────────────────────────────────────── */
#preview-section {
  margin-top: 1.75rem;
}
.preview-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.preview-card {
  border: 1px solid var(--color-border);
  border-radius: 6px;
  overflow: hidden;
  background: var(--color-card-bg);
  transition: border-color 0.2s;
}
.preview-card-main {
  border-color: var(--color-secondary);
  box-shadow: 0 0 0 1px var(--color-secondary);
}
.preview-label {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-text-secondary);
  padding: 0.5rem 0.75rem;
  background: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
}
.preview-card-main .preview-label {
  color: var(--color-secondary);
  border-color: var(--color-secondary);
}
.preview-card canvas {
  width: 100%;
  height: auto;
  display: block;
  background: #fff;
}

/* ── Buttons ─────────────────────────────────────────────────── */
#actions {
  margin-top: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  align-items: center;
}
.actions-group {
  display: flex;
  gap: 0.6rem;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
}
.actions-label {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-text-secondary);
  min-width: 6em;
}

.btn {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  padding: 0.6rem 1.1rem;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s;
  text-align: center;
  border: 1px solid transparent;
}
.btn-primary {
  background: var(--color-accent);
  color: #E8E0D4;
  border-color: var(--color-accent);
}
.btn-primary:hover {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  color: #E8E0D4;
}
.btn-outline {
  background: transparent;
  color: var(--color-text-secondary);
  border-color: var(--color-border);
}
.btn-outline:hover {
  border-color: var(--color-text-secondary);
  color: var(--color-text);
}
.btn-secondary {
  background: transparent;
  color: var(--color-secondary);
  border-color: var(--color-secondary);
}
.btn-secondary:hover {
  background: var(--color-secondary);
  color: var(--color-bg);
}

button:focus-visible {
  outline: 2px solid var(--color-secondary);
  outline-offset: 2px;
}

/* ── Footer ──────────────────────────────────────────────────── */
footer {
  text-align: center;
  padding: 2rem 1.25rem;
  border-top: 1px solid var(--color-border);
  font-size: 0.8125rem;
  color: var(--color-text-dim);
  font-style: italic;
}

/* ── Toast ────────────────────────────────────────────────────── */
#toast-container {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 200;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  align-items: center;
}
.toast {
  padding: 0.6rem 1.1rem;
  border-radius: 4px;
  font-size: 0.8125rem;
  color: #E8E0D4;
  animation: toast-in 0.3s ease;
  max-width: 360px;
  text-align: center;
  border: 1px solid transparent;
}
.toast-error {
  background: var(--color-error);
  border-color: var(--color-highlight);
}
.toast-info {
  background: var(--color-bg-alt);
  border-color: var(--color-border);
  color: var(--color-text);
}
@keyframes toast-in {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── Utilities ───────────────────────────────────────────────── */
.hidden { display: none !important; }

/* ── Responsive ──────────────────────────────────────────────── */
@media (max-width: 700px) {
  header { padding: 2rem 1rem 1rem; }
  main { padding: 0 1rem 1.5rem; }

  .view-bar-inner { gap: 0.75rem 1.25rem; }
  .view-bar-label { width: 100%; }

  .upload-zone { padding: 2.25rem 1rem; }
  .upload-text { font-size: 0.9375rem; }

  #mask-section { padding: 0.75rem 1rem; }
  .mask-toolbar { gap: 1rem; }
  .mask-controls { gap: 0.75rem; width: 100%; }
  .mask-tool-group { width: 100%; justify-content: flex-start; }
  input[type="range"] { width: 80px; }

  .control-group { flex-direction: column; gap: 1.5rem; }
  .control-col { min-width: 0; }
  .swatch { width: 32px; height: 32px; }
  .swatch-grid { gap: 6px; }

  .preview-grid { grid-template-columns: 1fr; }

  #actions { gap: 0.75rem; }
  .actions-group { width: 100%; flex-direction: column; align-items: stretch; }
  .actions-label { text-align: center; min-width: 0; margin-bottom: 0.2rem; }
  .btn { width: 100%; padding: 0.75rem 1rem; font-size: 0.875rem; }

  #toast-container { bottom: 1rem; }
  .toast { max-width: 90vw; }
}

@media (max-width: 900px) and (min-width: 701px) {
  .control-group { gap: 1.5rem; }
  .control-col { min-width: 160px; }
  .swatch { width: 26px; height: 26px; }
  .btn { padding: 0.55rem 0.95rem; font-size: 0.78rem; }
}

@media (prefers-reduced-motion: reduce) {
  .swatch, .swatch:hover { transition: none; transform: none; }
  .upload-zone, .btn, .btn-sm, .preview-card { transition: none; }
  .toast { animation: none; }
}