/* ===== OpenRouter Chat — Design System ===== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --bg-base: #0d0d0f;
  --bg-surface: #141416;
  --bg-elevated: #1a1a1f;
  --bg-hover: #202028;
  --bg-active: #26263a;
  --border: #2a2a35;
  --border-light: #333345;

  --text-primary: #f0f0f8;
  --text-secondary: #9090a8;
  --text-muted: #5a5a72;

  --accent: #7c6df2;
  --accent-soft: rgba(124, 109, 242, 0.15);
  --accent-glow: rgba(124, 109, 242, 0.3);
  --green: #4ade80;
  --red: #f87171;
  --amber: #fbbf24;

  --user-bubble: #1e1e2e;
  --assistant-bubble: transparent;
  --radius: 12px;
  --radius-sm: 8px;

  --sidebar-w: 260px;
  --font-mono: 'JetBrains Mono', monospace;
  --font-sans: 'Inter', system-ui, sans-serif;
}

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

html, body {
  height: 100%;
  font-family: var(--font-sans);
  background: var(--bg-base);
  color: var(--text-primary);
  font-size: 14px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ===== LAYOUT ===== */
.app {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* ===== SIDEBAR ===== */
.sidebar {
  width: var(--sidebar-w);
  background: var(--bg-surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  transition: transform 0.2s;
}

.sidebar-header {
  padding: 18px 16px 14px;
  border-bottom: 1px solid var(--border);
}

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

.logo-icon {
  width: 30px;
  height: 30px;
  background: linear-gradient(135deg, var(--accent) 0%, #a78bfa 100%);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
}

.logo-text {
  font-weight: 600;
  font-size: 15px;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.logo-text span {
  color: var(--accent);
}

.btn-new-chat {
  width: 100%;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  padding: 9px 14px;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 7px;
  transition: background 0.15s, box-shadow 0.15s;
}

.btn-new-chat:hover {
  background: #6b5de0;
  box-shadow: 0 0 16px var(--accent-glow);
}

.sidebar-section-label {
  padding: 10px 16px 6px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.conversations-list {
  flex: 1;
  overflow-y: auto;
  padding: 4px 8px;
}

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

.conv-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.12s;
  group: true;
  position: relative;
}

.conv-item:hover { background: var(--bg-hover); }
.conv-item.active { background: var(--bg-active); }

.conv-icon {
  font-size: 14px;
  flex-shrink: 0;
  opacity: 0.7;
}

.conv-title {
  flex: 1;
  font-size: 13px;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.conv-item.active .conv-title { color: var(--text-primary); }

.conv-delete {
  opacity: 0;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 2px 4px;
  border-radius: 4px;
  font-size: 13px;
  transition: opacity 0.15s, color 0.15s;
  flex-shrink: 0;
}

.conv-item:hover .conv-delete { opacity: 1; }
.conv-delete:hover { color: var(--red); }

.conv-time {
  font-size: 11px;
  color: var(--text-muted);
  flex-shrink: 0;
}

/* ===== MAIN CHAT AREA ===== */
.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  background: var(--bg-base);
}

.chat-header {
  height: 56px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 20px;
  gap: 12px;
  background: var(--bg-surface);
  flex-shrink: 0;
}

.model-select-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
}

.model-label {
  font-size: 12px;
  color: var(--text-muted);
  white-space: nowrap;
}

.model-select {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-primary);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  font-family: var(--font-sans);
  font-size: 13px;
  cursor: pointer;
  max-width: 280px;
  flex: 1;
  transition: border-color 0.15s;
}

.model-select:focus {
  outline: none;
  border-color: var(--accent);
}

.header-status {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text-muted);
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 6px var(--green);
}

.status-dot.offline { background: var(--red); box-shadow: 0 0 6px var(--red); }

/* ===== MESSAGES ===== */
.messages-area {
  flex: 1;
  overflow-y: auto;
  padding: 24px 0;
  scroll-behavior: smooth;
}

.messages-area::-webkit-scrollbar { width: 6px; }
.messages-area::-webkit-scrollbar-track { background: transparent; }
.messages-area::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

.message-row {
  display: flex;
  gap: 14px;
  padding: 8px 24px;
  max-width: 900px;
  margin: 0 auto;
  width: 100%;
  animation: msgIn 0.2s ease;
}

@keyframes msgIn {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.msg-avatar {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  flex-shrink: 0;
  margin-top: 2px;
}

.msg-avatar.user {
  background: #2a1f5e;
  color: #a78bfa;
}

.msg-avatar.assistant {
  background: linear-gradient(135deg, #1a2a1a 0%, #1a2e1a 100%);
  color: var(--green);
}

.msg-body {
  flex: 1;
  min-width: 0;
}

.msg-header {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 5px;
}

.msg-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
}

.msg-time {
  font-size: 11px;
  color: var(--text-muted);
}

.msg-content {
  color: var(--text-primary);
  font-size: 14px;
  line-height: 1.75;
}

.msg-content.user-text {
  background: var(--user-bubble);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 14px;
  display: inline-block;
  max-width: 100%;
}

/* Markdown rendering */
.msg-content h1, .msg-content h2, .msg-content h3 {
  margin: 14px 0 6px;
  color: var(--text-primary);
  font-weight: 600;
}

.msg-content h1 { font-size: 20px; }
.msg-content h2 { font-size: 17px; }
.msg-content h3 { font-size: 15px; }

.msg-content p { margin-bottom: 10px; }
.msg-content p:last-child { margin-bottom: 0; }

.msg-content ul, .msg-content ol {
  padding-left: 20px;
  margin-bottom: 10px;
}

.msg-content li { margin-bottom: 4px; }

.msg-content code {
  font-family: var(--font-mono);
  font-size: 12.5px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  padding: 1px 5px;
  border-radius: 4px;
  color: #a78bfa;
}

.msg-content pre {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px;
  overflow-x: auto;
  margin: 10px 0;
  position: relative;
}

.msg-content pre code {
  background: none;
  border: none;
  padding: 0;
  color: var(--text-primary);
  font-size: 13px;
  line-height: 1.6;
}

.copy-code-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  background: var(--bg-hover);
  border: 1px solid var(--border);
  color: var(--text-muted);
  border-radius: 5px;
  padding: 3px 8px;
  font-size: 11px;
  cursor: pointer;
  font-family: var(--font-sans);
  transition: all 0.15s;
}

.copy-code-btn:hover { color: var(--text-primary); border-color: var(--accent); }

.msg-content blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 12px;
  color: var(--text-secondary);
  margin: 8px 0;
}

.msg-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 10px 0;
}

.msg-content th, .msg-content td {
  border: 1px solid var(--border);
  padding: 7px 12px;
  text-align: left;
}

.msg-content th {
  background: var(--bg-elevated);
  font-weight: 600;
}

.msg-content a { color: var(--accent); text-decoration: none; }
.msg-content a:hover { text-decoration: underline; }

.msg-content strong { font-weight: 600; color: var(--text-primary); }
.msg-content em { color: var(--text-secondary); }

.msg-image {
  max-width: 360px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  margin-bottom: 8px;
  display: block;
}

/* Typing cursor */
.typing-cursor::after {
  content: '▋';
  animation: blink 0.6s infinite;
  color: var(--accent);
}

@keyframes blink {
  0%, 50% { opacity: 1; }
  51%, 100% { opacity: 0; }
}

/* Empty state */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  gap: 16px;
  color: var(--text-muted);
  text-align: center;
  padding: 40px;
}

.empty-icon {
  font-size: 48px;
  opacity: 0.4;
}

.empty-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-secondary);
}

.empty-sub {
  font-size: 14px;
  max-width: 340px;
  line-height: 1.6;
}

.quick-models {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-top: 8px;
}

.quick-model-chip {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  border-radius: 20px;
  padding: 5px 12px;
  font-size: 12px;
  cursor: pointer;
  transition: all 0.15s;
}

.quick-model-chip:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
}

/* ===== INPUT AREA ===== */
.input-area {
  border-top: 1px solid var(--border);
  padding: 16px 24px 20px;
  background: var(--bg-surface);
  flex-shrink: 0;
}

.input-image-preview {
  display: none;
  align-items: center;
  gap: 10px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  margin-bottom: 10px;
}

.input-image-preview.visible { display: flex; }

.preview-img {
  width: 48px;
  height: 48px;
  object-fit: cover;
  border-radius: 6px;
}

.preview-name {
  flex: 1;
  font-size: 13px;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.preview-remove {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 16px;
  padding: 2px 6px;
  border-radius: 4px;
  transition: color 0.15s;
}

.preview-remove:hover { color: var(--red); }

.input-row {
  display: flex;
  align-items: flex-end;
  gap: 10px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 12px;
  transition: border-color 0.15s;
}

.input-row:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.btn-attach {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
  border-radius: 6px;
  font-size: 18px;
  transition: color 0.15s;
  flex-shrink: 0;
  line-height: 1;
  display: flex;
  align-items: center;
}

.btn-attach:hover { color: var(--accent); }

#chat-input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.5;
  resize: none;
  min-height: 24px;
  max-height: 180px;
  overflow-y: auto;
}

#chat-input::placeholder { color: var(--text-muted); }

#chat-input::-webkit-scrollbar { width: 4px; }
#chat-input::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

.btn-send {
  background: var(--accent);
  border: none;
  color: #fff;
  border-radius: 8px;
  width: 34px;
  height: 34px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 16px;
  transition: background 0.15s, box-shadow 0.15s, transform 0.1s;
}

.btn-send:hover {
  background: #6b5de0;
  box-shadow: 0 0 14px var(--accent-glow);
}

.btn-send:active { transform: scale(0.94); }
.btn-send:disabled { background: var(--bg-hover); color: var(--text-muted); cursor: not-allowed; box-shadow: none; }

.input-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 8px;
  padding: 0 2px;
}

.input-hint {
  font-size: 11px;
  color: var(--text-muted);
}

.token-counter {
  font-size: 11px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* ===== TOAST ===== */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  opacity: 0;
  transition: all 0.25s;
  pointer-events: none;
  z-index: 999;
  white-space: nowrap;
}

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

.toast.error { border-color: var(--red); color: var(--red); }
.toast.success { border-color: var(--green); color: var(--green); }

/* ===== LOADING SPINNER ===== */
.spinner {
  display: inline-block;
  width: 14px;
  height: 14px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

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

/* ===== MOBILE ===== */
@media (max-width: 700px) {
  .sidebar { position: fixed; left: 0; top: 0; bottom: 0; z-index: 100; transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .menu-btn { display: flex !important; }
  .message-row { padding: 8px 14px; }
}

.menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 20px;
  cursor: pointer;
  padding: 4px;
}