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

:root {
  --bg: #0a0a0f;
  --surface: #111118;
  --surface2: #1a1a26;
  --surface3: #22223a;
  --border: #2a2a44;
  --border2: #3a3a5e;
  --accent: #7c6af5;
  --accent2: #a78bfa;
  --accent3: #06d6a0;
  --accent4: #f72585;
  --text: #e8e8f0;
  --text2: #9898b8;
  --text3: #5a5a88;
  --user-bubble: linear-gradient(135deg, #5b21b6, #7c3aed);
  --bot-bubble: #16162a;
  --radius: 14px;
  --radius-sm: 8px;
  --font: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --shadow: 0 4px 32px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 24px rgba(124,106,245,0.2);
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  min-height: 100vh;
  overflow-x: hidden;
}

/* Grid background */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(124,106,245,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(124,106,245,0.04) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

/* ── Layout ───────────────────────────────────── */
.app {
  display: flex;
  height: 100vh;
  position: relative;
  z-index: 1;
}

/* ── Sidebar ──────────────────────────────────── */
.sidebar {
  width: 260px;
  min-width: 260px;
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: width 0.3s ease;
}

.sidebar-header {
  padding: 20px 18px 16px;
  border-bottom: 1px solid var(--border);
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--accent), var(--accent4));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}

.logo-text {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.3px;
  color: var(--text);
}

.logo-sub {
  font-size: 10px;
  color: var(--text3);
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 12px 8px;
}

.nav-section-label {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--text3);
  padding: 8px 10px 4px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--text2);
  font-size: 13.5px;
  font-weight: 500;
  transition: all 0.15s;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
}

.nav-item:hover { background: var(--surface2); color: var(--text); }
.nav-item.active {
  background: linear-gradient(135deg, rgba(124,106,245,0.18), rgba(167,139,250,0.1));
  color: var(--accent2);
  border: 1px solid rgba(124,106,245,0.25);
}
.nav-item .nav-icon { font-size: 16px; flex-shrink: 0; width: 20px; text-align: center; }
.nav-badge {
  margin-left: auto;
  background: var(--accent);
  color: #fff;
  font-size: 10px;
  padding: 1px 6px;
  border-radius: 20px;
  font-weight: 600;
}

.sidebar-footer {
  padding: 12px;
  border-top: 1px solid var(--border);
}

.provider-status {
  background: var(--surface2);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
}

.provider-status-title {
  font-size: 11px;
  color: var(--text3);
  font-weight: 600;
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.provider-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}

.provider-chip {
  font-size: 10px;
  padding: 2px 8px;
  border-radius: 20px;
  font-weight: 600;
  border: 1px solid;
}

.provider-chip.on  { background: rgba(6,214,160,0.12); color: #06d6a0; border-color: rgba(6,214,160,0.3); }
.provider-chip.off { background: rgba(255,255,255,0.04); color: var(--text3); border-color: var(--border); }

/* ── Main Area ────────────────────────────────── */
.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
}

/* ── Top Bar ──────────────────────────────────── */
.topbar {
  padding: 12px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--surface);
  flex-shrink: 0;
}

.topbar-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  flex: 1;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.icon-btn {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface2);
  color: var(--text2);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  transition: all 0.15s;
}
.icon-btn:hover { border-color: var(--accent); color: var(--accent2); }

/* ── Tab Content Area ─────────────────────────── */
.tab-content {
  display: none;
  flex: 1;
  overflow: hidden;
  flex-direction: column;
}
.tab-content.active { display: flex; }

/* ── Chat Tab ─────────────────────────────────── */
.chat-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.messages-area {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  scroll-behavior: smooth;
}

.messages-area::-webkit-scrollbar { width: 4px; }
.messages-area::-webkit-scrollbar-track { background: transparent; }
.messages-area::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 4px; }

.welcome-message {
  text-align: center;
  padding: 60px 20px;
  color: var(--text3);
}

.welcome-message .big-icon {
  font-size: 56px;
  display: block;
  margin-bottom: 16px;
  filter: drop-shadow(0 0 20px rgba(124,106,245,0.4));
}

.welcome-message h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--text2);
  margin-bottom: 8px;
}

.welcome-message p { font-size: 14px; line-height: 1.6; }

.suggestion-chips {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin-top: 20px;
}

.suggestion-chip {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text2);
  padding: 7px 14px;
  border-radius: 20px;
  font-size: 12.5px;
  cursor: pointer;
  transition: all 0.15s;
}
.suggestion-chip:hover { border-color: var(--accent); color: var(--accent2); background: rgba(124,106,245,0.08); }

.message-row {
  display: flex;
  margin-bottom: 16px;
  animation: fadeUp 0.25s ease;
}

.message-row.user { justify-content: flex-end; }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.avatar {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  flex-shrink: 0;
  margin-top: 2px;
}

.avatar.bot-avatar { background: linear-gradient(135deg, var(--accent), var(--accent4)); margin-right: 8px; }
.avatar.user-avatar { background: linear-gradient(135deg, #5b21b6, #7c3aed); margin-left: 8px; }

.message-bubble {
  max-width: 75%;
  border-radius: var(--radius);
  padding: 12px 16px;
  font-size: 14px;
  line-height: 1.65;
  position: relative;
}

.message-row.user .message-bubble {
  background: var(--user-bubble);
  color: #fff;
  border-radius: 14px 4px 14px 14px;
}

.message-row.bot .message-bubble {
  background: var(--bot-bubble);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 4px 14px 14px 14px;
}

.message-bubble .model-tag {
  display: inline-block;
  font-size: 10px;
  background: rgba(124,106,245,0.15);
  color: var(--accent2);
  border: 1px solid rgba(124,106,245,0.25);
  padding: 1px 7px;
  border-radius: 20px;
  margin-bottom: 6px;
  font-weight: 600;
}

/* Markdown rendering */
.message-bubble h1, .message-bubble h2, .message-bubble h3 {
  font-size: 15px; font-weight: 700; margin: 10px 0 5px; color: var(--accent2);
}
.message-bubble p { margin-bottom: 8px; }
.message-bubble ul, .message-bubble ol { padding-left: 20px; margin-bottom: 8px; }
.message-bubble li { margin-bottom: 3px; }
.message-bubble code {
  background: rgba(124,106,245,0.12);
  border: 1px solid rgba(124,106,245,0.2);
  padding: 1px 6px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: #c4b5fd;
}
.message-bubble pre {
  background: #0d0d1a;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  overflow-x: auto;
  margin: 8px 0;
  position: relative;
}
.message-bubble pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 12.5px;
  color: var(--text);
}
.copy-code-btn {
  position: absolute;
  top: 6px; right: 8px;
  background: var(--surface2);
  border: 1px solid var(--border2);
  color: var(--text2);
  border-radius: 5px;
  padding: 2px 8px;
  font-size: 11px;
  cursor: pointer;
}
.copy-code-btn:hover { color: var(--accent2); }
.message-bubble strong { color: var(--text); font-weight: 600; }
.message-bubble a { color: var(--accent2); text-decoration: underline; }
.message-bubble blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 12px;
  color: var(--text2);
  margin: 8px 0;
}
.message-bubble table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12.5px;
  margin: 8px 0;
}
.message-bubble th, .message-bubble td {
  border: 1px solid var(--border);
  padding: 6px 10px;
  text-align: left;
}
.message-bubble th { background: var(--surface3); color: var(--accent2); font-weight: 600; }

.model-breakdown {
  margin-top: 10px;
  border-top: 1px solid var(--border);
  padding-top: 8px;
}

.model-breakdown-toggle {
  font-size: 11px;
  color: var(--text3);
  cursor: pointer;
  user-select: none;
  display: flex;
  align-items: center;
  gap: 5px;
}

.model-breakdown-toggle:hover { color: var(--accent2); }

.model-breakdown-list {
  display: none;
  margin-top: 8px;
  font-size: 12px;
}

.model-breakdown-list.open { display: block; }

.model-breakdown-item {
  display: flex;
  gap: 8px;
  padding: 6px 0;
  border-bottom: 1px solid var(--border);
}

.model-name {
  font-size: 10px;
  font-weight: 700;
  color: var(--accent2);
  min-width: 120px;
  padding-top: 1px;
}

.model-text {
  color: var(--text2);
  font-size: 12px;
  line-height: 1.5;
  flex: 1;
}

/* Thinking/loading */
.thinking-bubble .message-bubble {
  display: flex;
  align-items: center;
  gap: 6px;
}

.thinking-dots span {
  display: inline-block;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
  animation: bounce 1.2s infinite;
}

.thinking-dots span:nth-child(2) { animation-delay: 0.2s; }
.thinking-dots span:nth-child(3) { animation-delay: 0.4s; }

@keyframes bounce {
  0%, 60%, 100% { transform: translateY(0); }
  30% { transform: translateY(-6px); }
}

/* ── Input Bar ────────────────────────────────── */
.input-bar {
  padding: 12px 20px 16px;
  border-top: 1px solid var(--border);
  background: var(--surface);
  flex-shrink: 0;
}

.input-options {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
  flex-wrap: wrap;
}

.input-select {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text2);
  border-radius: 6px;
  padding: 4px 8px;
  font-size: 12px;
  cursor: pointer;
  outline: none;
}
.input-select:hover, .input-select:focus { border-color: var(--accent); }

.input-row {
  display: flex;
  gap: 10px;
  align-items: flex-end;
}

.chat-textarea {
  flex: 1;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 11px 16px;
  color: var(--text);
  font-family: var(--font);
  font-size: 14px;
  resize: none;
  outline: none;
  min-height: 46px;
  max-height: 160px;
  transition: border-color 0.15s;
  line-height: 1.5;
}
.chat-textarea:focus { border-color: var(--accent); }
.chat-textarea::placeholder { color: var(--text3); }

.send-btn {
  width: 46px;
  height: 46px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--accent), #5b21b6);
  border: none;
  color: #fff;
  font-size: 18px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s;
  flex-shrink: 0;
}
.send-btn:hover { transform: scale(1.05); box-shadow: 0 4px 16px rgba(124,106,245,0.4); }
.send-btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

.voice-btn {
  width: 46px;
  height: 46px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface2);
  color: var(--text2);
  font-size: 18px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s;
  flex-shrink: 0;
}
.voice-btn:hover { border-color: var(--accent); color: var(--accent2); }
.voice-btn.recording { background: rgba(247,37,133,0.15); border-color: var(--accent4); color: var(--accent4); animation: pulse 1s infinite; }

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(247,37,133,0.4); }
  50% { box-shadow: 0 0 0 8px rgba(247,37,133,0); }
}

.input-footer {
  margin-top: 6px;
  font-size: 11px;
  color: var(--text3);
}

/* ── Generic Tab Panel ────────────────────────── */
.panel {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
}

.panel::-webkit-scrollbar { width: 4px; }
.panel::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 4px; }

.panel-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  margin-bottom: 16px;
}

.panel-section h3 {
  font-size: 13px;
  font-weight: 700;
  color: var(--text2);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 7px;
}

.input-group {
  display: flex;
  gap: 8px;
  align-items: flex-start;
  flex-wrap: wrap;
}

.text-input {
  flex: 1;
  min-width: 180px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 9px 12px;
  color: var(--text);
  font-family: var(--font);
  font-size: 13.5px;
  outline: none;
  transition: border-color 0.15s;
}
.text-input:focus { border-color: var(--accent); }
.text-input::placeholder { color: var(--text3); }

.textarea-input {
  width: 100%;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 13px;
  outline: none;
  resize: vertical;
  min-height: 80px;
  transition: border-color 0.15s;
}
.textarea-input:focus { border-color: var(--accent); }

.btn {
  padding: 9px 16px;
  border-radius: var(--radius-sm);
  border: none;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}
.btn-primary { background: linear-gradient(135deg, var(--accent), #5b21b6); color: #fff; }
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 4px 16px rgba(124,106,245,0.3); }
.btn-secondary { background: var(--surface2); border: 1px solid var(--border2); color: var(--text2); }
.btn-secondary:hover { border-color: var(--accent); color: var(--accent2); }
.btn-danger { background: rgba(247,37,133,0.1); border: 1px solid rgba(247,37,133,0.3); color: var(--accent4); }
.btn-danger:hover { background: rgba(247,37,133,0.2); }

.answer-box {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px;
  margin-top: 12px;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--text);
  white-space: pre-wrap;
  word-break: break-word;
  min-height: 40px;
}

.answer-box img { max-width: 100%; border-radius: 8px; margin-top: 8px; }

/* ── Tools Grid ───────────────────────────────── */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 14px;
  padding: 20px;
  overflow-y: auto;
  flex: 1;
}

.tools-grid::-webkit-scrollbar { width: 4px; }
.tools-grid::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 4px; }

.tool-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  transition: border-color 0.15s;
}
.tool-card:hover { border-color: var(--border2); }

.tool-card-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}

.tool-card-icon {
  font-size: 20px;
  width: 36px;
  height: 36px;
  background: var(--surface2);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
}

.tool-card-title { font-size: 13px; font-weight: 700; color: var(--text); }
.tool-card-sub { font-size: 11px; color: var(--text3); }

.tool-result {
  margin-top: 10px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px;
  font-size: 12.5px;
  color: var(--text2);
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 200px;
  overflow-y: auto;
  display: none;
}
.tool-result.show { display: block; }
.tool-result img { max-width: 100%; border-radius: 6px; }

/* ── Status Bar ───────────────────────────────── */
.status-bar {
  padding: 5px 20px;
  background: var(--surface);
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 11.5px;
  color: var(--text3);
  flex-shrink: 0;
}

.status-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent3);
  flex-shrink: 0;
}

.status-dot.loading { background: var(--accent); animation: pulse-dot 0.8s infinite; }

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

/* ── System Prompt Editor ─────────────────────── */
.system-prompt-area {
  padding: 12px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.system-prompt-area.collapsed { display: none; }

.sys-textarea {
  width: 100%;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 12.5px;
  outline: none;
  resize: vertical;
  min-height: 60px;
  max-height: 120px;
  transition: border-color 0.15s;
}
.sys-textarea:focus { border-color: var(--accent); }

/* ── Settings Tab ─────────────────────────────── */
.settings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 14px;
}

.setting-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}
.setting-item:last-child { border-bottom: none; }

.setting-label { font-size: 13px; color: var(--text2); font-weight: 500; }
.setting-desc { font-size: 11px; color: var(--text3); margin-top: 2px; }

.toggle {
  width: 40px;
  height: 22px;
  background: var(--surface3);
  border-radius: 20px;
  border: 1px solid var(--border2);
  cursor: pointer;
  position: relative;
  transition: background 0.2s;
  flex-shrink: 0;
}
.toggle.on { background: var(--accent); border-color: var(--accent); }
.toggle::after {
  content: '';
  position: absolute;
  top: 2px; left: 2px;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: #fff;
  transition: transform 0.2s;
}
.toggle.on::after { transform: translateX(18px); }

.range-input { width: 120px; accent-color: var(--accent); }

/* ── File Upload ──────────────────────────────── */
.drop-zone {
  border: 2px dashed var(--border2);
  border-radius: var(--radius);
  padding: 30px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
  color: var(--text3);
}
.drop-zone:hover, .drop-zone.drag-over {
  border-color: var(--accent);
  background: rgba(124,106,245,0.05);
  color: var(--accent2);
}
.drop-zone .drop-icon { font-size: 36px; display: block; margin-bottom: 8px; }
.drop-zone p { font-size: 13px; }

.file-list {
  margin-top: 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.file-chip {
  background: var(--surface2);
  border: 1px solid var(--border2);
  border-radius: 6px;
  padding: 4px 10px;
  font-size: 12px;
  color: var(--text2);
  display: flex;
  align-items: center;
  gap: 5px;
}
.file-chip .remove-file { cursor: pointer; color: var(--text3); font-size: 14px; }
.file-chip .remove-file:hover { color: var(--accent4); }

/* ── Multi-agent ──────────────────────────────── */
.pipeline-steps {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.pipeline-step {
  display: flex;
  align-items: center;
  gap: 8px;
}

.step-badge {
  padding: 5px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text3);
  transition: all 0.3s;
}
.step-badge.active { background: rgba(124,106,245,0.2); border-color: var(--accent); color: var(--accent2); }
.step-badge.done   { background: rgba(6,214,160,0.1); border-color: rgba(6,214,160,0.3); color: var(--accent3); }

.step-arrow { color: var(--text3); font-size: 14px; }

.multi-result-section { margin-top: 12px; }
.multi-result-section h4 {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text3);
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 6px;
}

/* ── Responsive ───────────────────────────────── */
@media (max-width: 700px) {
  .sidebar { display: none; }
  .message-bubble { max-width: 92%; }
  .tools-grid { grid-template-columns: 1fr; padding: 12px; }
}