/* ─── Reset & Base ─────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --color-bg:        #0f1117;
  --color-surface:   #1a1d27;
  --color-surface2:  #22263a;
  --color-border:    #2e3350;
  --color-primary:   #4f7cff;
  --color-primary-h: #3a65e8;
  --color-danger:    #e05252;
  --color-success:   #3ecf8e;
  --color-warning:   #f5a623;
  --color-text:      #e2e4f0;
  --color-muted:     #7c82a0;
  --color-diff-col:  #2a1f40;
  --radius:          8px;
  --radius-lg:       12px;
  --shadow:          0 4px 24px rgba(0,0,0,0.4);
  --transition:      0.18s ease;
  font-size: 15px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
  line-height: 1.6;
}

/* ─── Layout ───────────────────────────────────────────────────────────────── */
.app-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 0 32px;
  height: 58px;
  display: flex;
  align-items: center;
  gap: 12px;
  position: sticky;
  top: 0;
  z-index: 100;
}

.app-header h1 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.app-header .badge {
  background: var(--color-primary);
  color: #fff;
  font-size: 0.68rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 99px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.main-layout {
  display: grid;
  grid-template-columns: 380px 1fr;
  min-height: calc(100vh - 58px);
}

/* ─── Sidebar / Form panel ─────────────────────────────────────────────────── */
.form-panel {
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  padding: 28px 24px;
  overflow-y: auto;
  position: sticky;
  top: 58px;
  height: calc(100vh - 58px);
}

.form-panel h2 {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-muted);
  margin-bottom: 16px;
  margin-top: 24px;
}

.form-panel h2:first-child { margin-top: 0; }

/* ─── Form elements ────────────────────────────────────────────────────────── */
.field { margin-bottom: 14px; }

label {
  display: block;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--color-muted);
  margin-bottom: 5px;
}

input[type="text"],
input[type="url"],
input[type="number"],
input[type="password"] {
  width: 100%;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text);
  padding: 8px 12px;
  font-size: 0.9rem;
  transition: border-color var(--transition);
  outline: none;
}

input:focus {
  border-color: var(--color-primary);
}

input::placeholder { color: var(--color-muted); opacity: 0.6; }

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

/* ─── Checkboxes ───────────────────────────────────────────────────────────── */
.checkbox-group { display: flex; flex-direction: column; gap: 8px; }

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  user-select: none;
}

.checkbox-row input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--color-primary);
  cursor: pointer;
  flex-shrink: 0;
}

.checkbox-row span {
  font-size: 0.88rem;
  color: var(--color-text);
}

.checkbox-row .vp-dims {
  font-size: 0.76rem;
  color: var(--color-muted);
  margin-left: auto;
}

/* ─── Custom viewport inputs ───────────────────────────────────────────────── */
.custom-vp-inputs {
  display: none;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-top: 10px;
  padding: 12px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.custom-vp-inputs.visible { display: grid; }
.custom-vp-inputs label { font-size: 0.75rem; margin-bottom: 3px; }

/* ─── Toggle switch ────────────────────────────────────────────────────────── */
.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.toggle-row span { font-size: 0.88rem; color: var(--color-text); }

.toggle {
  position: relative;
  width: 40px;
  height: 22px;
  flex-shrink: 0;
}

.toggle input { opacity: 0; width: 0; height: 0; }

.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--color-border);
  border-radius: 22px;
  cursor: pointer;
  transition: background var(--transition);
}

.toggle-slider::before {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  left: 3px;
  top: 3px;
  background: #fff;
  border-radius: 50%;
  transition: transform var(--transition);
}

.toggle input:checked + .toggle-slider { background: var(--color-primary); }
.toggle input:checked + .toggle-slider::before { transform: translateX(18px); }

/* ─── Collapsible section ──────────────────────────────────────────────────── */
.collapsible-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
  padding: 8px 0;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 12px;
}

.collapsible-header h2 { margin: 0; }

.collapsible-arrow {
  font-size: 0.75rem;
  color: var(--color-muted);
  transition: transform var(--transition);
}

.collapsible-header.open .collapsible-arrow { transform: rotate(90deg); }

.collapsible-body { display: none; }
.collapsible-body.open { display: block; }

/* ─── Repeatable rows ──────────────────────────────────────────────────────── */
.repeatable-list { display: flex; flex-direction: column; gap: 8px; margin-bottom: 8px; }

.repeatable-row {
  display: grid;
  gap: 6px;
  align-items: center;
}

.repeatable-row.cookie-row { grid-template-columns: 1fr 1fr; }
.repeatable-row.header-row { grid-template-columns: 1fr 1fr; }

.repeatable-row input { margin: 0; }

.btn-remove {
  background: none;
  border: none;
  color: var(--color-danger);
  cursor: pointer;
  font-size: 1rem;
  padding: 4px;
  line-height: 1;
  border-radius: 4px;
  transition: background var(--transition);
}

.btn-remove:hover { background: rgba(224,82,82,0.12); }

.btn-add {
  background: none;
  border: 1px dashed var(--color-border);
  color: var(--color-muted);
  cursor: pointer;
  font-size: 0.8rem;
  padding: 6px 10px;
  border-radius: var(--radius);
  width: 100%;
  transition: border-color var(--transition), color var(--transition);
}

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

/* ─── Slider label ─────────────────────────────────────────────────────────── */
.slider-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.slider-row input { flex: 1; }
.slider-value {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-primary);
  min-width: 36px;
  text-align: right;
}

/* ─── R2 prefix field ──────────────────────────────────────────────────────── */
.r2-prefix-field { display: none; margin-top: 10px; }
.r2-prefix-field.visible { display: block; }

/* ─── Submit button ────────────────────────────────────────────────────────── */
.btn-submit {
  width: 100%;
  padding: 12px;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  margin-top: 20px;
  transition: background var(--transition), transform var(--transition);
}

.btn-submit:hover:not(:disabled) { background: var(--color-primary-h); }
.btn-submit:active:not(:disabled) { transform: scale(0.98); }

.btn-submit:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ─── Results panel ────────────────────────────────────────────────────────── */
.results-panel {
  padding: 32px;
  overflow-x: auto;
}

.results-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  min-height: 400px;
  color: var(--color-muted);
  text-align: center;
  gap: 12px;
}

.results-empty .icon { font-size: 3rem; opacity: 0.3; }
.results-empty p { font-size: 0.9rem; max-width: 280px; }

/* ─── Error banner ─────────────────────────────────────────────────────────── */
.error-banner {
  background: rgba(224,82,82,0.12);
  border: 1px solid var(--color-danger);
  border-radius: var(--radius);
  padding: 14px 18px;
  margin-bottom: 24px;
  font-size: 0.88rem;
  color: var(--color-danger);
}

.warning-banner {
  background: rgba(245,166,35,0.12);
  border: 1px solid var(--color-warning);
  border-radius: var(--radius);
  padding: 14px 18px;
  margin-bottom: 24px;
  font-size: 0.88rem;
  color: var(--color-warning);
}

/* ─── Viewport section ─────────────────────────────────────────────────────── */
.viewport-section {
  margin-bottom: 48px;
}

.viewport-section-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.viewport-section-header h3 {
  font-size: 1rem;
  font-weight: 600;
}

.viewport-section-header .vp-tag {
  background: var(--color-surface2);
  border: 1px solid var(--color-border);
  border-radius: 99px;
  font-size: 0.75rem;
  color: var(--color-muted);
  padding: 2px 10px;
}

/* ─── Screenshot grid ──────────────────────────────────────────────────────── */
.screenshot-grid {
  display: grid;
  gap: 16px;
  /* columns set dynamically by JS */
}

/* ─── Screenshot cell ──────────────────────────────────────────────────────── */
.screenshot-cell {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  min-width: 0;
}

.screenshot-cell.diff-cell {
  background: var(--color-diff-col);
  border-color: #3a2a5a;
}

.cell-header {
  padding: 10px 14px;
  background: var(--color-surface2);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.cell-header .cell-title {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.diff-cell .cell-header { background: #2a1f40; border-bottom-color: #3a2a5a; }

.cell-header .cell-url {
  font-size: 0.7rem;
  color: var(--color-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 180px;
}

/* ─── Cell canvas container ────────────────────────────────────────────────── */
.cell-canvas-wrap {
  position: relative;
  overflow: hidden;
  background: #fff;
  /* aspect ratio maintained by the canvas */
}

.cell-canvas-wrap canvas {
  width: 100%;
  height: auto;
  display: block;
}

/* ─── Loading state ────────────────────────────────────────────────────────── */
.cell-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 40px 20px;
  color: var(--color-muted);
  font-size: 0.82rem;
}

.spinner {
  width: 28px;
  height: 28px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ─── Diff stats ───────────────────────────────────────────────────────────── */
.diff-stats {
  padding: 8px 14px;
  font-size: 0.75rem;
  color: var(--color-muted);
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: 6px;
}

.diff-stats .diff-count { font-weight: 600; }
.diff-stats .diff-count.has-diff { color: var(--color-danger); }
.diff-stats .diff-count.no-diff  { color: var(--color-success); }

/* ─── R2 notice ────────────────────────────────────────────────────────────── */
.r2-notice {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 14px 18px;
  margin-top: 32px;
  font-size: 0.82rem;
}

.r2-notice h4 {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-muted);
  margin-bottom: 8px;
}

.r2-notice ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.r2-notice li {
  font-family: 'SF Mono', 'Fira Code', monospace;
  color: var(--color-success);
  font-size: 0.78rem;
}

/* ─── Responsive ───────────────────────────────────────────────────────────── */
@media (max-width: 900px) {
  .main-layout {
    grid-template-columns: 1fr;
  }

  .form-panel {
    position: static;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--color-border);
  }

  .results-panel {
    padding: 20px 16px;
  }
}