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

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #1B1B1B;
}

#tank {
  display: block;
  width: 100%;
  height: 100%;
}

.start-screen {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #1B1B1B;
  z-index: 100;
  transition: opacity 0.5s ease;
}

.start-screen.leaving {
  opacity: 0;
  pointer-events: none;
}

.start-screen.gone {
  display: none;
}

.start-content {
  width: min(400px, calc(100vw - 3rem));
  font-family: "Onest", system-ui, -apple-system, sans-serif;
}

.start-title {
  color: #F3F3F3;
  font-size: 1.25rem;
  font-weight: 500;
  letter-spacing: -0.015em;
  margin-bottom: 1rem;
}

.start-desc {
  color: color-mix(in srgb, #F3F3F3 80%, #5D5C5C);
  font-size: 0.8125rem;
  font-weight: 400;
  line-height: 1.7;
  margin-bottom: 0.75rem;
}

.start-desc.muted {
  color: #5D5C5C;
  margin-bottom: 1.5rem;
}

.start-note {
  color: #5D5C5C;
  font-size: 0.6875rem;
  line-height: 1.5;
  margin-bottom: 1.25rem;
}

.start-btn {
  width: 100%;
  background: none;
  border: 1px solid #5D5C5C;
  border-radius: 4px;
  color: #F3F3F3;
  font-family: "Onest", system-ui, -apple-system, sans-serif;
  font-size: 0.8125rem;
  font-weight: 500;
  padding: 0.5rem 0;
  cursor: pointer;
  transition: border-color 0.2s ease;
}

.start-btn:hover {
  border-color: #F3F3F3;
}

.popup {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  background: #161616;
  color: #F3F3F3;
  padding: 0.625rem 1.25rem;
  border-radius: 4px;
  font-family: "Onest", system-ui, -apple-system, sans-serif;
  font-size: 0.8125rem;
  font-weight: 400;
  letter-spacing: 0.01em;
  border: 1px solid #2A2A2A;
  transition: opacity 0.3s ease, transform 0.3s ease;
  z-index: 10;
  pointer-events: none;
}

.popup.hidden {
  opacity: 0;
  transform: translateX(-50%) translateY(10px);
}

.popup.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.notify {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: #161616;
  color: #F3F3F3;
  padding: 0.75rem 1.5rem;
  border-radius: 4px;
  font-family: "Onest", system-ui, -apple-system, sans-serif;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  border: 1px solid #2A2A2A;
  transition: opacity 0.4s ease, transform 0.4s ease;
  z-index: 20;
  pointer-events: none;
}

.notify.hidden {
  opacity: 0;
  transform: translate(-50%, -50%) scale(0.95);
}

.notify.visible {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

.restart {
  position: fixed;
  top: 1rem;
  right: 3.5rem;
  background: none;
  color: #5D5C5C;
  padding: 0.375rem 0.75rem;
  border-radius: 4px;
  font-family: "Onest", system-ui, -apple-system, sans-serif;
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.01em;
  border: 1px solid #2A2A2A;
  cursor: pointer;
  transition: opacity 0.4s ease, color 0.2s ease, border-color 0.2s ease;
  z-index: 30;
}

.restart:hover {
  color: #F3F3F3;
  border-color: #5D5C5C;
}

.restart.hidden {
  opacity: 0;
  pointer-events: none;
}

.restart.visible {
  opacity: 1;
  pointer-events: auto;
}

.settings-toggle {
  position: fixed;
  top: 1rem;
  right: 1rem;
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: 1px solid #2A2A2A;
  border-radius: 4px;
  color: #5D5C5C;
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease;
  z-index: 30;
}

.settings-toggle:hover {
  color: #F3F3F3;
  border-color: #5D5C5C;
}

.settings-panel {
  position: fixed;
  top: 3.5rem;
  right: 1rem;
  width: 280px;
  background: #161616;
  border: 1px solid #2A2A2A;
  border-radius: 4px;
  padding: 1rem;
  font-family: "Onest", system-ui, -apple-system, sans-serif;
  z-index: 30;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.settings-panel.hidden {
  opacity: 0;
  pointer-events: none;
  transform: translateY(-4px);
}

.settings-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
  color: #F3F3F3;
  font-size: 0.8125rem;
  font-weight: 500;
}

.settings-close {
  background: none;
  border: none;
  color: #5D5C5C;
  font-size: 1.125rem;
  cursor: pointer;
  line-height: 1;
  padding: 0;
}

.settings-close:hover {
  color: #F3F3F3;
}

.settings-label {
  display: block;
  color: #5D5C5C;
  font-size: 0.6875rem;
  font-weight: 400;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  margin-bottom: 0.375rem;
}

.settings-row {
  margin-bottom: 0.75rem;
}

.settings-input {
  width: 100%;
  background: #1B1B1B;
  border: 1px solid #2A2A2A;
  border-radius: 3px;
  color: #F3F3F3;
  font-family: "Onest", system-ui, -apple-system, sans-serif;
  font-size: 0.8125rem;
  padding: 0.4375rem 0.625rem;
  outline: none;
  transition: border-color 0.2s ease;
}

.settings-input::placeholder {
  color: #5D5C5C;
}

.settings-input:focus {
  border-color: #5D5C5C;
}

.settings-actions {
  display: flex;
  gap: 0.5rem;
}

.settings-btn {
  flex: 1;
  background: none;
  border: 1px solid #2A2A2A;
  border-radius: 3px;
  color: #5D5C5C;
  font-family: "Onest", system-ui, -apple-system, sans-serif;
  font-size: 0.75rem;
  font-weight: 400;
  padding: 0.375rem 0;
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.settings-btn:hover {
  color: #F3F3F3;
  border-color: #5D5C5C;
}

.settings-btn.primary {
  color: #F3F3F3;
  border-color: #5D5C5C;
}

.settings-btn.primary:hover {
  border-color: #F3F3F3;
}

.api-status {
  margin-top: 0.625rem;
  font-size: 0.75rem;
  min-height: 1.125rem;
  transition: color 0.2s ease;
}

.api-status.success {
  color: #90E9A2;
}

.api-status.error {
  color: #EC9494;
}

.api-status.loading {
  color: #5D5C5C;
}

.spinner-overlay {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  background: rgba(27, 27, 27, 0.85);
  z-index: 40;
  transition: opacity 0.3s ease;
}

.spinner-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.spinner {
  width: 28px;
  height: 28px;
  border: 2px solid #2A2A2A;
  border-top-color: #F3F3F3;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.spinner-label {
  color: #5D5C5C;
  font-family: "Onest", system-ui, -apple-system, sans-serif;
  font-size: 0.8125rem;
}

.spinner-seeds {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: #F3F3F3;
  font-family: "Onest", system-ui, -apple-system, sans-serif;
  font-size: 0.8125rem;
  font-weight: 400;
  margin-bottom: 1.25rem;
}

.spinner-seeds-x {
  color: #5D5C5C;
  font-size: 0.625rem;
}

.brief-modal {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(27, 27, 27, 0.85);
  z-index: 50;
  transition: opacity 0.3s ease;
}

.brief-modal.hidden {
  opacity: 0;
  pointer-events: none;
}

.brief-content {
  background: #161616;
  border: 1px solid #2A2A2A;
  border-radius: 6px;
  padding: 2rem 2rem 1.5rem;
  width: min(520px, calc(100vw - 2rem));
  max-height: calc(100vh - 4rem);
  overflow-y: auto;
  font-family: "Onest", system-ui, -apple-system, sans-serif;
  scrollbar-width: thin;
  scrollbar-color: #2A2A2A transparent;
}

.brief-content::-webkit-scrollbar { width: 4px; }
.brief-content::-webkit-scrollbar-track { background: transparent; }
.brief-content::-webkit-scrollbar-thumb { background: #2A2A2A; border-radius: 2px; }

.brief-seeds {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid #2A2A2A;
  font-size: 0.75rem;
  letter-spacing: 0.01em;
}

.brief-seeds a {
  color: #5D5C5C;
  text-decoration: none;
  transition: color 0.15s ease;
}

.brief-seeds a:hover {
  color: #F3F3F3;
}

.brief-seeds-x {
  color: #2A2A2A;
  font-size: 0.625rem;
}

.brief-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.brief-title {
  color: #F3F3F3;
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.35;
  letter-spacing: -0.01em;
}

.brief-body {
  margin: 0 0 1.5rem;
}

.brief-body h1,
.brief-body h2,
.brief-body h3,
.brief-body h4 {
  color: #F3F3F3;
  font-family: "Onest", system-ui, -apple-system, sans-serif;
  font-weight: 500;
  letter-spacing: -0.015em;
  margin: 0 0 0.5em;
}

.brief-body h1 { font-size: 1rem; line-height: 1.35; }
.brief-body h2 { font-size: 0.9375rem; line-height: 1.35; }
.brief-body h3 { font-size: 0.875rem; line-height: 1.4; }
.brief-body h4 { font-size: 0.8125rem; line-height: 1.4; }

.brief-body h1 + *,
.brief-body h2 + *,
.brief-body h3 + *,
.brief-body h4 + * {
  margin-top: 0;
}

.brief-body p {
  color: color-mix(in srgb, #F3F3F3 80%, #5D5C5C);
  font-family: "Onest", system-ui, -apple-system, sans-serif;
  font-size: 0.8125rem;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: 0.005em;
  margin: 0 0 0.875em;
}

.brief-body p:last-child { margin-bottom: 0; }

.brief-body strong {
  color: #F3F3F3;
  font-weight: 500;
}

.brief-body em {
  font-style: italic;
  color: color-mix(in srgb, #F3F3F3 68%, #5D5C5C);
}

.brief-body ul,
.brief-body ol {
  color: color-mix(in srgb, #F3F3F3 80%, #5D5C5C);
  font-size: 0.8125rem;
  line-height: 1.75;
  margin: 0 0 0.875em;
  padding-left: 1.25em;
}

.brief-body li {
  margin-bottom: 0.25em;
}

.brief-body li::marker {
  color: #5D5C5C;
}

.brief-body li:last-child { margin-bottom: 0; }

.brief-body blockquote {
  border-left: 2px solid #2A2A2A;
  padding-left: 1em;
  margin: 0 0 0.875em;
}

.brief-body blockquote p {
  color: color-mix(in srgb, #F3F3F3 60%, #5D5C5C);
  font-style: italic;
}

.brief-body code {
  font-family: "Commit Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.75rem;
  background: #1B1B1B;
  padding: 0.125em 0.35em;
  border-radius: 3px;
  color: color-mix(in srgb, #F3F3F3 72%, #5D5C5C);
}

.brief-body hr {
  border: none;
  height: 1px;
  background: #2A2A2A;
  margin: 1.25em 0;
}

.brief-body a {
  color: #82C7F5;
  text-decoration: none;
  text-underline-offset: 0.2em;
}

.brief-body a:hover {
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, #82C7F5, transparent 50%);
}

.brief-actions {
  display: flex;
  gap: 0.5rem;
  padding-top: 1rem;
  border-top: 1px solid #2A2A2A;
}