/* ============================================================
   CSS Variables (design tokens)
   ============================================================ */
:root {
  --color-accent: #1D9E75;
  --color-accent-amber: #BA7517;
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f7f6f3;
  --color-bg-tertiary: #f0efe9;
  --color-text-primary: #1a1a18;
  --color-text-secondary: #5a5a56;
  --color-text-tertiary: #9a9a94;
  --color-border: rgba(0, 0, 0, 0.12);
  --color-border-strong: rgba(0, 0, 0, 0.22);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg-primary: #1a1a18;
    --color-bg-secondary: #222220;
    --color-bg-tertiary: #2a2a28;
    --color-text-primary: #f0efe9;
    --color-text-secondary: #a0a09a;
    --color-text-tertiary: #606060;
    --color-border: rgba(255, 255, 255, 0.10);
    --color-border-strong: rgba(255, 255, 255, 0.20);
  }
}

[data-theme="dark"] {
  --color-bg-primary: #1a1a18;
  --color-bg-secondary: #222220;
  --color-bg-tertiary: #2a2a28;
  --color-text-primary: #f0efe9;
  --color-text-secondary: #a0a09a;
  --color-text-tertiary: #606060;
  --color-border: rgba(255, 255, 255, 0.10);
  --color-border-strong: rgba(255, 255, 255, 0.20);
}

[data-theme="light"] {
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f7f6f3;
  --color-bg-tertiary: #f0efe9;
  --color-text-primary: #1a1a18;
  --color-text-secondary: #5a5a56;
  --color-text-tertiary: #9a9a94;
  --color-border: rgba(0, 0, 0, 0.12);
  --color-border-strong: rgba(0, 0, 0, 0.22);
}

/* ============================================================
   Reset & base
   ============================================================ */
*, *::before, *::after {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  background: var(--color-bg-secondary);
  color: var(--color-text-primary);
  font-family: 'DM Sans', system-ui, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  transition: background 0.15s, color 0.15s;
}

/* ============================================================
   Layout
   ============================================================ */
.app-layout {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.app-main {
  max-width: 1060px;
  width: 100%;
  margin: 1.5rem auto;
  padding: 0 1rem;
}

.beta-banner {
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 0.5rem 1rem;
  margin-bottom: 1rem;
  font-size: 13px;
  color: var(--color-text-secondary);
  text-align: center;
}

.beta-banner a {
  color: var(--color-accent);
  text-decoration: underline;
}

/* ============================================================
   Header
   ============================================================ */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  height: 48px;
  background: var(--color-bg-primary);
  border-bottom: 0.5px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.header-logo {
  font-size: 20px;
  font-weight: 500;
  letter-spacing: 0.04em;
  line-height: 1;
}

.header-subtitle {
  font-size: 13px;
  font-weight: 400;
  color: var(--color-text-tertiary);
  line-height: 1;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.dark-mode-btn {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 16px;
  color: var(--color-text-secondary);
  padding: 4px 6px;
  border-radius: 6px;
  line-height: 1;
  transition: background 0.1s;
}

.dark-mode-btn:hover {
  background: var(--color-bg-tertiary);
}

.dark-mode-btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.header-version {
  font-size: 11px;
  color: var(--color-text-tertiary);
  font-family: 'DM Mono', monospace;
}

/* ============================================================
   Section cards
   ============================================================ */
.section-card {
  background: var(--color-bg-primary);
  border: 0.5px solid var(--color-border);
  border-radius: 12px;
  padding: 1.25rem;
  margin-bottom: 1rem;
}

.section-label {
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-tertiary);
  margin-bottom: 0.75rem;
}

/* ============================================================
   ROM Section
   ============================================================ */
.rom-dropzone {
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1.5px dashed var(--color-border-strong);
  border-radius: 10px;
  padding: 1.25rem 1rem;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  background: var(--color-bg-secondary);
  min-height: 72px;
}

.rom-dropzone:hover,
.rom-dropzone:focus-visible {
  border-color: var(--color-accent);
  background: var(--color-bg-tertiary);
  outline: none;
}

.rom-dropzone--active {
  border-color: var(--color-accent);
  background: var(--color-bg-tertiary);
}

.rom-dropzone--filled {
  border-style: solid;
  border-color: var(--color-border);
  justify-content: flex-start;
  padding: 0.75rem 1rem;
  min-height: unset;
}

.rom-dropzone-hint {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  pointer-events: none;
}

.rom-dropzone-icon {
  font-size: 16px;
  color: var(--color-text-tertiary);
  line-height: 1;
}

.rom-dropzone-text {
  font-size: 13px;
  color: var(--color-text-secondary);
}

.rom-dropzone-or {
  font-size: 12px;
  color: var(--color-text-tertiary);
}

.rom-dropzone-btn {
  pointer-events: none;
  font-size: 12px;
  padding: 4px 10px;
}

.rom-version-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.rom-version-badge {
  display: inline-block;
  font-family: 'DM Mono', monospace;
  font-size: 11px;
  font-weight: 500;
  padding: 2px 8px;
  border-radius: 4px;
  background: var(--color-bg-tertiary);
  border: 0.5px solid var(--color-border-strong);
  color: var(--color-accent);
}

.rom-version-badge--custom {
  color: var(--color-accent-amber);
}

.rom-filename {
  font-size: 13px;
  color: var(--color-text-primary);
  font-family: 'DM Mono', monospace;
  word-break: break-all;
}

.rom-placeholder {
  font-size: 13px;
  color: var(--color-text-tertiary);
  font-style: italic;
}

/* ============================================================
   Buttons
   ============================================================ */
.btn {
  font-family: 'DM Sans', system-ui, sans-serif;
  font-size: 13px;
  font-weight: 500;
  border-radius: 8px;
  padding: 6px 14px;
  cursor: pointer;
  border: none;
  transition: background 0.1s, opacity 0.1s;
  white-space: nowrap;
}

.btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn-secondary {
  background: var(--color-bg-tertiary);
  color: var(--color-text-secondary);
  border: 0.5px solid var(--color-border-strong);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--color-border);
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
}

.btn-primary:hover:not(:disabled) {
  opacity: 0.88;
}

.btn-generate {
  width: 100%;
  padding: 10px 14px;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

/* ============================================================
   Flags Section — Tabs
   ============================================================ */
.flags-tabs {
  display: flex;
  gap: 0;
  border-bottom: 0.5px solid var(--color-border);
  margin-bottom: 0.75rem;
  overflow-x: auto;
}

.flags-tab-btn {
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  padding: 6px 14px;
  font-family: 'DM Sans', system-ui, sans-serif;
  font-size: 13px;
  font-weight: 400;
  color: var(--color-text-secondary);
  cursor: pointer;
  white-space: nowrap;
  margin-bottom: -0.5px;
  transition: color 0.1s, border-color 0.1s;
}

.flags-tab-btn:hover {
  color: var(--color-text-primary);
}

.flags-tab-btn--active {
  color: var(--color-text-primary);
  border-bottom-color: var(--color-accent);
  font-weight: 500;
}

.flags-tab-btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: -2px;
}

/* ============================================================
   Flags Section — Two-column layout
   ============================================================ */
.flag-tab {
  display: flex;
  gap: 0;
}

.flag-col {
  flex: 1;
  min-width: 0;
}

.flag-col-divider {
  width: 0.5px;
  background: var(--color-border);
  margin: 0 1rem;
  flex-shrink: 0;
}

/* ============================================================
   Flag Row
   ============================================================ */
.flag-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 5px 4px;
  border-radius: 6px;
}

.flag-row:hover {
  background: var(--color-bg-secondary);
}

.flag-row--coerced {
  opacity: 0.75;
}

.flag-label {
  font-size: 13px;
  color: var(--color-text-primary);
  flex: 1;
  user-select: none;
}

.flag-lock {
  margin-left: 4px;
  font-size: 11px;
  opacity: 0.7;
}

/* ============================================================
   Flag Checkbox
   ============================================================ */
.flag-checkbox {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  border: 1.5px solid var(--color-border-strong);
  border-radius: 4px;
  background: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  line-height: 1;
  padding: 0;
  color: transparent;
  transition: border-color 0.1s, background 0.1s;
}

.flag-checkbox:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.flag-checkbox--on {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
}

.flag-checkbox--random {
  background: none;
  border-color: var(--color-accent-amber);
  color: var(--color-accent-amber);
}

/* ============================================================
   Enum select
   ============================================================ */
.flag-enum-select {
  font-family: 'DM Sans', system-ui, sans-serif;
  font-size: 12px;
  color: var(--color-text-primary);
  background: var(--color-bg-tertiary);
  border: 0.5px solid var(--color-border-strong);
  border-radius: 6px;
  padding: 2px 6px;
  cursor: pointer;
  max-width: 160px;
}

.flag-enum-select:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* ============================================================
   Color Picker (NES palette)
   ============================================================ */
.flag-color-picker {
  position: relative;
  display: inline-flex;
  flex-shrink: 0;
}

.color-picker-toggle {
  width: 24px;
  height: 24px;
  border: 2px solid var(--color-border-strong);
  border-radius: 4px;
  cursor: pointer;
  font-size: 8px;
  font-family: 'DM Sans', system-ui, sans-serif;
  color: var(--color-text-primary);
  background: var(--color-bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
}

.color-picker-toggle--vanilla {
  font-size: 7px;
  letter-spacing: -0.3px;
}

.color-picker-toggle--random {
  font-size: 7px;
  letter-spacing: -0.3px;
  background: linear-gradient(135deg,
    #e66 0%, #e96 17%, #ee6 33%, #6e6 50%,
    #6ee 67%, #66e 83%, #e6e 100%);
  color: #000;
}

.color-picker-toggle--color {
  border-width: 2px;
}

.color-picker-toggle:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.color-picker-panel {
  position: absolute;
  top: 100%;
  left: 0;
  z-index: 100;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border-strong);
  border-radius: 8px;
  padding: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  margin-top: 4px;
  width: max-content;
}

.color-picker-specials {
  display: flex;
  gap: 4px;
  margin-bottom: 6px;
}

.color-picker-special-btn {
  font-family: 'DM Sans', system-ui, sans-serif;
  font-size: 11px;
  padding: 2px 8px;
  border: 1px solid var(--color-border-strong);
  border-radius: 4px;
  cursor: pointer;
  background: var(--color-bg-tertiary);
  color: var(--color-text-primary);
}

.color-picker-special-btn--selected {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

.color-picker-grid {
  display: grid;
  grid-template-columns: repeat(16, 18px);
  grid-template-rows: repeat(4, 18px);
  gap: 1px;
}

.color-swatch {
  width: 18px;
  height: 18px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 2px;
  cursor: pointer;
  padding: 0;
  box-sizing: border-box;
}

.color-swatch:hover:not(:disabled) {
  border-color: #fff;
  transform: scale(1.2);
  z-index: 1;
  position: relative;
}

.color-swatch--selected {
  border: 2px solid #fff;
  box-shadow: 0 0 0 1px #000, 0 0 4px rgba(255, 255, 255, 0.5);
}

.color-swatch--excluded {
  cursor: not-allowed;
  opacity: 0.2;
}

/* ============================================================
   Tooltip
   ============================================================ */
.tooltip-wrapper {
  position: relative;
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
}

.tooltip-trigger {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 1px solid var(--color-border-strong);
  background: none;
  color: var(--color-text-tertiary);
  font-size: 10px;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: default;
  line-height: 1;
  user-select: none;
}

.tooltip-trigger:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.tooltip-popup {
  display: none;
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  background: var(--color-bg-primary);
  border: 0.5px solid var(--color-border-strong);
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 12px;
  color: var(--color-text-secondary);
  max-width: 280px;
  white-space: normal;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
  z-index: 200;
  line-height: 1.4;
  pointer-events: none;
  width: max-content;
}

.tooltip-wrapper:hover .tooltip-popup,
.tooltip-trigger:focus-visible ~ .tooltip-popup {
  display: block;
}

/* ============================================================
   Generate Section
   ============================================================ */
.generate-fields {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.generate-field {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.field-label {
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-tertiary);
}

.seed-row {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.seed-input {
  font-family: 'DM Mono', monospace;
  font-size: 13px;
  color: var(--color-text-primary);
  background: var(--color-bg-secondary);
  border: 0.5px solid var(--color-border-strong);
  border-radius: 8px;
  padding: 6px 10px;
  width: 100%;
  min-width: 0;
}

.seed-input:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 1px;
}

.seed-input::-webkit-inner-spin-button,
.seed-input::-webkit-outer-spin-button {
  -webkit-appearance: none;
}

.seed-input[type=number] {
  -moz-appearance: textfield;
}

.flag-string-input {
  font-family: 'DM Mono', monospace;
  font-size: 12px;
  color: var(--color-text-primary);
  background: var(--color-bg-secondary);
  border: 0.5px solid var(--color-border-strong);
  border-radius: 8px;
  padding: 6px 10px;
  width: 100%;
}

.flag-string-input:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 1px;
}

.flag-string-input--error {
  border-color: #cc3333;
}

.mono {
  font-family: 'DM Mono', monospace;
}

.generate-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.generate-result {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-top: 0.75rem;
  flex-wrap: wrap;
}

.download-actions {
  display: flex;
  gap: 0.5rem;
  flex-basis: 100%;
  margin-top: 0.25rem;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
  background: var(--color-muted, #888);
}

.status-dot--ready {
  background: var(--color-accent);
  box-shadow: 0 0 6px var(--color-accent);
}

.status-dot--error {
  background: #e05555;
  box-shadow: 0 0 6px #e05555;
}

.status-text {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-accent);
}

.gen-time {
  font-size: 12px;
  color: var(--color-text-tertiary);
  font-family: 'DM Mono', monospace;
}

.hash-code {
  width: 100%;
  margin-top: 0.25rem;
  font-size: 12px;
  color: var(--color-text-secondary);
  font-family: 'DM Mono', monospace;
}

.hash-code-label {
  color: var(--color-text-tertiary);
  margin-right: 0.4rem;
}

/* ============================================================
   Spinner
   ============================================================ */
@keyframes spin {
  to { transform: rotate(360deg); }
}

.spinner {
  display: inline-block;
  width: 14px;
  height: 14px;
  border: 2px solid rgba(255, 255, 255, 0.35);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  flex-shrink: 0;
}

/* ============================================================
   Inline error
   ============================================================ */
.inline-error {
  font-size: 12px;
  color: #cc3333;
  margin-top: 0.35rem;
}

.error-details {
  margin: 0.35rem 0 0 0;
  padding-left: 1.25rem;
}

.error-details li {
  margin-bottom: 0.2rem;
}

/* ============================================================
   Flags loading state
   ============================================================ */
.flags-loading {
  font-size: 13px;
  color: var(--color-text-tertiary);
  padding: 0.5rem 0;
}

/* (Visualizer styles are inlined in the new-tab HTML — see app.js buildVisualizerHTML) */

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 768px) {
  .app-main {
    margin: 1rem auto;
    padding: 0 0.75rem;
  }

  .flag-tab {
    flex-direction: column;
  }

  .flag-col-divider {
    width: 100%;
    height: 0.5px;
    margin: 0.5rem 0;
  }

  .generate-fields {
    grid-template-columns: 1fr;
  }

  .app-header {
    padding: 0 1rem;
  }

  .header-subtitle {
    display: none;
  }
}

.hint-type {
  color: var(--text-secondary, #888);
  font-size: 0.85em;
}