/* --- Settings modal overlay --- */
.settings-overlay {
  position: fixed;
  inset: 0;
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(8px);
}

.settings-panel {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.5);
  width: 90vw;
  height: 90vh;
  overflow-y: auto;
  padding: 0;
  color: var(--ink);
}

.settings-panel::-webkit-scrollbar {
  width: 6px;
}

.settings-panel::-webkit-scrollbar-track {
  background: transparent;
}

.settings-panel::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}

.settings-panel-header {
  position: sticky;
  top: 0;
  z-index: 1;
  background: var(--bg);
  padding: 24px 28px 16px;
  border-bottom: 1px solid var(--border);
}

.settings-panel-header h2 {
  margin: 0;
  font-size: 20px;
  font-weight: 600;
}

.settings-panel-body {
  padding: 8px 28px 24px;
}

.settings-section {
  margin-bottom: 8px;
}

.settings-section-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  background: none;
  border: none;
  padding: 12px 0;
  cursor: pointer;
  color: var(--ink);
  border-bottom: 1px solid var(--border);
}

.settings-section-toggle h3 {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin: 0;
  font-weight: 600;
}

.settings-section-toggle .chevron {
  width: 16px;
  height: 16px;
  color: var(--muted);
  transition: transform 0.2s ease;
}

.settings-section-toggle[aria-expanded="false"] .chevron {
  transform: rotate(-90deg);
}

.settings-section-content {
  padding: 12px 0 4px;
}

.settings-section-content[hidden] {
  display: none;
}

.settings-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
}

.settings-row label {
  flex: 0 0 130px;
  font-size: 13px;
  color: var(--muted);
  text-align: right;
}

.settings-row input[type="text"],
.settings-row input[type="url"],
.settings-row select {
  flex: 1;
  padding: 8px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--ink);
  font-size: 13px;
  transition: border-color 0.15s;
}

.settings-row input[type="text"]:focus,
.settings-row input[type="url"]:focus,
.settings-row select:focus,
.settings-prompt-textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.settings-row input[type="color"] {
  width: 32px;
  height: 32px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: none;
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
}

.settings-row .color-hex {
  flex: 1;
  padding: 8px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--ink);
  font-size: 13px;
  font-family: monospace;
  transition: border-color 0.15s;
}

.settings-row .color-hex:focus {
  outline: none;
  border-color: var(--accent);
}

/* --- Colors grid --- */
.settings-colors-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px 20px;
}

.settings-colors-grid .settings-row {
  margin-bottom: 6px;
}

.settings-colors-grid .settings-row label {
  flex: 0 0 110px;
  font-size: 12px;
}

.settings-colors-grid .color-hex {
  font-size: 12px;
  padding: 6px 8px;
}

.settings-colors-grid input[type="color"] {
  width: 28px;
  height: 28px;
}

/* --- System prompt --- */
.settings-prompt-textarea {
  width: 100%;
  min-height: 180px;
  max-height: 400px;
  resize: vertical;
  padding: 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--ink);
  font-size: 12px;
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  line-height: 1.5;
  tab-size: 2;
}

.settings-prompt-hint {
  font-size: 11px;
  color: var(--muted);
  margin: 4px 0 8px;
}

/* --- Logo upload area --- */
.settings-logo-preview {
  height: 36px;
  width: auto;
}

.settings-logo-upload {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 4px 0;
}

.settings-logo-upload input[type="file"] {
  display: none;
}

/* --- Mobile settings --- */
@media (max-width: 640px) {
  .settings-panel {
    width: 100vw;
    height: 100vh;
    border-radius: 0;
    border: none;
  }

  .settings-panel-header {
    padding: 16px 16px 12px;
  }

  .settings-panel-body {
    padding: 4px 16px 20px;
  }

  .settings-row {
    flex-wrap: wrap;
    gap: 6px;
  }

  .settings-row label {
    flex: 0 0 auto;
    text-align: left;
    font-size: 12px;
  }

  .settings-row input[type="text"],
  .settings-row input[type="url"],
  .settings-row select {
    flex: 1 1 100%;
    font-size: 14px;
  }

  .settings-colors-grid {
    grid-template-columns: 1fr;
  }

  .settings-colors-grid .settings-row label {
    flex: 0 0 auto;
  }

  .settings-prompt-textarea {
    min-height: 120px;
    font-size: 13px;
  }

  .settings-actions {
    padding: 12px 16px;
    gap: 8px;
  }

  .settings-actions button {
    padding: 10px 14px;
    font-size: 13px;
  }
}

.settings-logo-upload .btn-upload {
  padding: 6px 14px;
  border-radius: 8px;
  border: 1px solid var(--accent);
  background: transparent;
  color: var(--accent);
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  transition: background 0.15s, color 0.15s;
}

.settings-logo-upload .btn-upload:hover {
  background: var(--accent);
  color: var(--accent-on-dark);
}

/* --- Footer buttons --- */
.settings-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  position: sticky;
  bottom: 0;
  background: var(--bg);
  padding: 16px 28px;
  border-top: 1px solid var(--border);
}

.settings-actions button {
  padding: 9px 18px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: opacity 0.15s;
}

.btn-save {
  background: var(--accent);
  color: var(--accent-on-dark);
}

.btn-save:hover {
  opacity: 0.9;
}

.btn-cancel {
  background: var(--surface-hover);
  color: var(--ink);
  border: 1px solid var(--border) !important;
}

.btn-reset {
  background: transparent;
  color: var(--error-text);
  border: 1px solid var(--error-border) !important;
  margin-right: auto;
  font-size: 12px;
  padding: 8px 14px;
}

.btn-reset:hover {
  background: var(--error-bg);
}

/* --- Gear icon button in header --- */
.btn-settings {
  background: none;
  border: none;
  border-radius: 50%;
  width: 36px;
  height: 36px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--muted);
  transition: color 0.2s, background 0.2s;
}

.btn-settings:hover {
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, transparent);
}