:root {
  --background: #000000;
  --foreground: #ffffff;
  --card: #0a0a0a;
  --primary: #ffffff;
  --primary-foreground: #000000;
  --muted-foreground: #a3a3a3;
  --accent: #262626;
  --accent-foreground: #ffffff;
  --destructive: #FF3B30;
  --brand: #ff5a36;
  --border: #262626;
  --input: #171717;
  --ring: #262626;
  --radius: 0.5rem;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  border-color: var(--border);
}

body {
  background: var(--background);
  color: var(--foreground);
  font-family: 'Geist', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 14px;
  line-height: 1.5;
  height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.mono { font-family: 'Geist Mono', 'SFMono-Regular', 'Menlo', monospace; }

header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  flex-shrink: 0;
}

.header-border { border-bottom: 1px solid var(--border); }

.header-inner {
  width: 100%;
  height: 64px;
  padding: 0 24px;
  display: flex;
  align-items: center;
}

.header-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--foreground);
}

.header-logo img { height: 32px; width: auto; object-fit: contain; }
.header-logo span { font-size: 18px; font-weight: 600; letter-spacing: -0.02em; }

.header-nav {
  display: flex;
  align-items: center;
  margin-left: 12px;
  padding-left: 12px;
  border-left: 1px solid var(--border);
}

.nav-current { color: var(--muted-foreground); font-size: 14px; }
.header-spacer { flex: 1; }

.tools-toggle {
  display: none;
  align-items: center;
  gap: 6px;
  height: 32px;
  padding: 0 12px;
  background: transparent;
  color: var(--muted-foreground);
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) - 2px);
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 150ms;
}

.tools-toggle:hover { color: var(--foreground); background: var(--accent); }

main { flex: 1; display: flex; overflow: hidden; width: 100%; }

aside {
  width: 360px;
  min-width: 240px;
  max-width: 60vw;
  flex-shrink: 0;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  overflow-y: auto;
}

.resize-handle {
  width: 5px;
  flex-shrink: 0;
  cursor: col-resize;
  background: transparent;
  border-left: 1px solid var(--border);
  transition: background 150ms;
}

.resize-handle:hover, .resize-handle.active { background: var(--accent); }

.panel-section { display: flex; flex-direction: column; gap: 8px; }
.panel-tools { flex: 1; min-height: 0; }

.panel-header { display: flex; align-items: center; justify-content: space-between; }
.panel-label { font-size: 13px; font-weight: 600; letter-spacing: -0.01em; }

.presets { display: flex; flex-wrap: wrap; gap: 6px; }

.preset-btn {
  padding: 5px 10px;
  background: var(--card);
  color: var(--muted-foreground);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-family: inherit;
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all 150ms;
}

.preset-btn:hover { color: var(--foreground); border-color: var(--brand); }

.file-btn {
  font-size: 12px;
  font-weight: 500;
  color: var(--muted-foreground);
  cursor: pointer;
  transition: color 150ms;
}

.file-btn:hover { color: var(--foreground); }
.file-btn input { display: none; }

.model-name { font-size: 12px; font-family: 'Geist Mono', monospace; color: var(--muted-foreground); }

.btn-finetune {
  flex-shrink: 0;
  height: 36px;
  padding: 0 14px;
  background: var(--primary);
  color: var(--primary-foreground);
  border: none;
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: background 150ms;
  width: 100%;
}

.btn-finetune:hover { background: rgba(255, 255, 255, 0.9); }
.btn-finetune:disabled { opacity: 0.5; pointer-events: none; }

textarea {
  flex: 1;
  min-height: 200px;
  font-family: 'Geist Mono', 'SFMono-Regular', 'Menlo', 'Monaco', 'Consolas', monospace;
  font-size: 13px;
  line-height: 1.6;
  resize: none;
  padding: 12px;
  background: var(--card);
  color: var(--foreground);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  outline: none;
  transition: border-color 150ms;
}

textarea:focus { border-color: var(--ring); box-shadow: 0 0 0 3px rgba(38, 38, 38, 0.5); }
textarea::placeholder { color: var(--muted-foreground); }

.query-area { flex: 1; display: flex; flex-direction: column; padding: 20px; gap: 20px; min-width: 0; }
.query-section { display: flex; flex-direction: column; gap: 8px; flex-shrink: 0; }

.input-row { display: flex; gap: 8px; }

.input-row input {
  flex: 1;
  height: 40px;
  padding: 0 14px;
  background: var(--input);
  color: var(--foreground);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 14px;
  outline: none;
  transition: border-color 150ms;
}

.input-row input:focus { border-color: var(--ring); box-shadow: 0 0 0 3px rgba(38, 38, 38, 0.5); }
.input-row input::placeholder { color: var(--muted-foreground); }

.btn-primary {
  height: 40px;
  padding: 0 20px;
  background: var(--primary);
  color: var(--primary-foreground);
  border: none;
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: background 150ms;
  white-space: nowrap;
}

.btn-primary:hover { background: rgba(255, 255, 255, 0.9); }
.btn-primary:disabled { opacity: 0.5; pointer-events: none; }

.btn-ghost {
  height: 40px;
  padding: 0 16px;
  background: transparent;
  color: var(--muted-foreground);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 14px;
  cursor: pointer;
  transition: all 150ms;
  white-space: nowrap;
}

.btn-ghost:hover { color: var(--foreground); background: var(--accent); }

.hint { font-size: 12px; color: var(--muted-foreground); }

.result-section { flex: 1; min-height: 0; display: flex; flex-direction: column; gap: 8px; }

.conversation {
  flex: 1;
  min-height: 0;
  padding: 8px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.empty { color: var(--muted-foreground); padding: 12px; font-size: 13px; }

.turn { display: flex; flex-direction: column; gap: 6px; padding: 10px; border-bottom: 1px solid var(--border); }
.turn:last-child { border-bottom: none; }

.turn-query { color: var(--foreground); font-size: 13px; font-weight: 500; }
.turn-query::before { content: "› "; color: var(--brand); }

.turn-result {
  margin: 0;
  padding: 12px;
  background: var(--input);
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) - 2px);
  font-family: 'Geist Mono', 'SFMono-Regular', 'Menlo', 'Monaco', 'Consolas', monospace;
  font-size: 13px;
  line-height: 1.6;
  color: var(--foreground);
  white-space: pre-wrap;
  word-break: break-word;
}

.turn-result.refused { color: var(--muted-foreground); font-style: italic; }

.turn-reasoning {
  font-size: 13px;
  color: var(--foreground);
  line-height: 1.55;
  padding: 8px 12px;
  background: var(--input);
  border-left: 2px solid var(--brand);
  border-radius: calc(var(--radius) - 2px);
}

.turn-reasoning-label {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--brand);
  margin-bottom: 4px;
}

.turn-reasoning-body { color: var(--foreground); }

.turn-meta { font-size: 12px; color: var(--muted-foreground); font-family: 'Geist Mono', monospace; }

.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.6);
  padding: 16px;
}

.modal-overlay.visible { display: flex; }

.modal {
  width: 100%;
  max-width: 520px;
  max-height: 85vh;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.modal-title { font-size: 15px; font-weight: 600; }

.modal-close {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  color: var(--muted-foreground);
  font-size: 20px;
  cursor: pointer;
  border-radius: calc(var(--radius) - 2px);
  transition: color 150ms, background 150ms;
  padding: 0;
  line-height: 1;
}

.modal-close:hover { color: var(--foreground); background: var(--accent); }

.modal-body { padding: 20px; overflow-y: auto; display: flex; flex-direction: column; gap: 16px; }
.modal-note { font-size: 13px; color: var(--muted-foreground); line-height: 1.5; }
.modal-field { display: flex; flex-direction: column; gap: 6px; }
.modal-label { font-size: 13px; font-weight: 500; color: var(--muted-foreground); }

.modal-input {
  height: 36px;
  padding: 0 12px;
  background: var(--input);
  color: var(--foreground);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 13px;
  outline: none;
  transition: border-color 150ms;
  width: 100%;
}

.modal-input:focus { border-color: var(--ring); box-shadow: 0 0 0 3px rgba(38, 38, 38, 0.5); }
.modal-input::placeholder { color: var(--muted-foreground); }
.modal-input-sm { font-family: 'Geist Mono', monospace; }

.modal-steps { display: none; gap: 4px; }
.modal-steps.visible { display: flex; flex-direction: column; }

.modal-step { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--muted-foreground); padding: 4px 0; }
.modal-step.active { color: var(--foreground); }
.modal-step.done { color: #4ade80; }

.step-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); flex-shrink: 0; transition: background 200ms; }
.modal-step.active .step-dot { background: var(--foreground); }
.modal-step.done .step-dot { background: #4ade80; }

.ft-progress { min-height: 20px; color: var(--foreground); font-size: 13px; }

.modal-footer { padding: 16px 20px; border-top: 1px solid var(--border); flex-shrink: 0; }
.modal-start { width: 100%; }

.modal-download {
  display: block;
  width: 100%;
  height: 40px;
  line-height: 40px;
  text-align: center;
  background: var(--primary);
  color: var(--primary-foreground);
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  transition: background 150ms;
}

.modal-download:hover { background: rgba(255, 255, 255, 0.9); }

.toast {
  position: fixed;
  top: 80px;
  right: 24px;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  max-width: 420px;
  padding: 12px 14px;
  background: #1a0000;
  border: 1px solid rgba(255, 59, 48, 0.3);
  border-radius: var(--radius);
  color: #ff6b6b;
  font-size: 13px;
  line-height: 1.5;
  z-index: 100;
  opacity: 0;
  transform: translateX(20px);
  pointer-events: none;
  transition: opacity 200ms, transform 200ms;
}

.toast.visible { opacity: 1; transform: translateX(0); pointer-events: auto; }
.toast-msg { flex: 1; word-break: break-word; }

.toast-close {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  color: #ff6b6b;
  font-size: 16px;
  cursor: pointer;
  opacity: 0.6;
  transition: opacity 150ms;
  padding: 0;
  line-height: 1;
}

.toast-close:hover { opacity: 1; }

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--accent); border-radius: 3px; }

@media (max-width: 768px) {
  .header-inner { padding: 0 16px; height: 56px; }
  .header-nav { display: none; }
  .tools-toggle { display: flex; }
  main { flex-direction: column; min-height: 0; }
  .resize-handle { display: none !important; }
  aside {
    width: 100% !important;
    min-width: 0 !important;
    max-width: none !important;
    flex-shrink: 0;
    display: none !important;
    padding: 16px;
    overflow-y: auto;
  }
  aside.open { display: flex !important; flex: 1; max-height: none; }
  aside.open .panel-tools { flex: 1; min-height: 0; }
  aside.open textarea { flex: 1; min-height: 0; }
  aside.open ~ .resize-handle, aside.open ~ .query-area { display: none !important; }
  .query-area { flex: 1; min-height: 0; padding: 16px; gap: 16px; }
  .result-section { flex: 1; min-height: 0; }
  .modal { max-width: none; max-height: none; height: 100%; border-radius: 0; }
  .modal-overlay { padding: 0; }
}

@media (max-width: 480px) {
  .header-inner { padding: 0 12px; }
  .header-logo span { display: none; }
  aside.open { padding: 12px; }
  .query-area { padding: 12px; }
  .btn-primary { padding: 0 14px; }
  .btn-ghost { display: none; }
}