/* ============================================================================
   BlackGPT — ChatGPT-style UI
   ========================================================================== */

:root {
  --bg-main: #212121;
  --bg-sidebar: #171717;
  --surface: #2f2f2f;
  --surface-hover: #323232;
  --border: rgba(255, 255, 255, 0.1);
  --border-strong: #3b3b3b;
  --text-primary: #ececec;
  --text-secondary: #b4b4b4;
  --text-tertiary: #9b9b9b;
  --accent: #10a37f;
  --accent-hover: #0d8a6c;
  --danger: #ef4444;
  --danger-hover: #dc2626;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;

  --sidebar-width: 260px;
  --content-max: 768px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 26px;
}

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

html, body {
  height: 100%;
  background-color: var(--bg-main);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

button { font-family: inherit; cursor: pointer; }
button:disabled { cursor: not-allowed; }

::selection { background: rgba(16, 163, 127, 0.35); }

::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #424242; border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: #4f4f4f; }

.hidden { display: none !important; }

/* ============ Layout ============ */
.app-layout {
  display: flex;
  height: 100vh;
  width: 100vw;
  overflow: hidden;
}

/* ============ Sidebar ============ */
.sidebar {
  width: var(--sidebar-width);
  height: 100%;
  background-color: var(--bg-sidebar);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  transition: margin-left 0.25s ease;
  z-index: 100;
}

.sidebar.collapsed { margin-left: calc(-1 * var(--sidebar-width)); }

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 10px 0;
}

.sidebar-search {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  border: none;
  color: var(--text-primary);
  padding: 9px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  text-align: left;
  transition: background 0.15s ease;
}

.sidebar-search:hover { background: var(--surface); }

.sidebar-actions {
  padding: 8px 10px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.btn-new-chat {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: var(--text-primary);
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 500;
  text-align: left;
  transition: background 0.15s ease;
}

.btn-new-chat:hover { background: var(--surface); }

.sidebar-search-input { padding: 4px 0; }

.sidebar-search-input input {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  outline: none;
}

.sidebar-search-input input:focus { border-color: rgba(255,255,255,0.25); }

.sidebar-history {
  flex: 1;
  overflow-y: auto;
  padding: 4px 8px 8px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.history-group-title {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-tertiary);
  padding: 4px 12px 0;
}

.history-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 0.87rem;
  position: relative;
  transition: background 0.15s ease, color 0.15s ease;
}

.history-item:hover { background: var(--surface); color: var(--text-primary); }
.history-item.active { background: var(--surface); color: var(--text-primary); }

.history-item-title {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.history-item-actions {
  display: none;
  align-items: center;
  gap: 2px;
}

.history-item:hover .history-item-actions,
.history-item.active .history-item-actions { display: flex; }

.history-item-btn {
  background: transparent;
  border: none;
  color: var(--text-tertiary);
  cursor: pointer;
  padding: 4px;
  border-radius: 5px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.history-item-btn:hover { color: var(--text-primary); background: rgba(255,255,255,0.08); }
.history-item-btn.danger:hover { color: var(--danger); }

.history-empty {
  padding: 12px 14px;
  color: var(--text-tertiary);
  font-size: 0.82rem;
}

.history-rename-input {
  flex: 1;
  background: var(--surface);
  border: 1px solid var(--accent);
  color: var(--text-primary);
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 0.85rem;
  outline: none;
  min-width: 0;
}

.sidebar-footer {
  padding: 8px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.sidebar-footer-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  width: 100%;
  background: transparent;
  border: none;
  color: var(--text-primary);
  border-radius: var(--radius-sm);
  text-align: left;
  font-size: 0.86rem;
  transition: background 0.15s ease;
}

.sidebar-footer-btn:hover { background: var(--surface); }

.avatar-sm {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--surface);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  flex-shrink: 0;
}

.user-info {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
}

.user-name {
  font-weight: 500;
  font-size: 0.84rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.user-sub { font-size: 0.72rem; color: var(--text-tertiary); }

/* ============ Main ============ */
.main-content {
  flex: 1;
  height: 100%;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  background-color: var(--bg-main);
}

/* ============ Topbar ============ */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  position: relative;
  z-index: 20;
}

.topbar-left, .topbar-right {
  display: flex;
  align-items: center;
  gap: 6px;
}

.sidebar-open-mobile { display: none; }

.icon-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 8px;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: color 0.15s ease, background 0.15s ease;
}

.icon-btn:hover { color: var(--text-primary); background: var(--surface); }

.model-selector {
  display: flex;
  align-items: center;
  gap: 6px;
  background: transparent;
  border: none;
  color: var(--text-primary);
  padding: 7px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  transition: background 0.15s ease;
}

.model-selector:hover { background: var(--surface); }

/* ============ Chat container ============ */
.chat-container {
  flex: 1;
  overflow-y: auto;
  scroll-behavior: smooth;
  display: flex;
  flex-direction: column;
}

.chat-messages {
  max-width: var(--content-max);
  width: 100%;
  margin: 0 auto;
  padding: 24px 40px 40px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* ============ Welcome ============ */
.welcome-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex: 1;
  padding: 40px 24px;
  text-align: center;
}

.welcome-logo {
  width: 88px;
  height: 88px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, #2a2a2a 0%, #0a0a0a 70%, #000 100%);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.6), inset 0 1px 0 rgba(255,255,255,0.04);
  animation: welcomePulse 4s ease-in-out infinite;
}

.welcome-logo-img {
  width: 56px;
  height: 56px;
  filter: drop-shadow(0 2px 4px rgba(255,255,255,0.08));
}

@keyframes welcomePulse {
  0%, 100% { box-shadow: 0 8px 24px rgba(0,0,0,0.6), inset 0 1px 0 rgba(255,255,255,0.04); }
  50% { box-shadow: 0 8px 32px rgba(255,255,255,0.08), inset 0 1px 0 rgba(255,255,255,0.08); }
}

.welcome-title {
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.welcome-credit {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin: 0;
  font-weight: 400;
  letter-spacing: 0.02em;
}

/* Welcome Suggestion Grid */
.welcome-suggestions {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  width: 100%;
  max-width: 620px;
  margin-top: 28px;
}

.suggestion-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  padding: 14px 16px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  cursor: pointer;
  text-align: left;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
}

.suggestion-card:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-1px);
}

.suggestion-title {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-primary);
}

.suggestion-desc {
  font-size: 0.78rem;
  color: var(--text-muted);
}

@media (max-width: 640px) {
  .welcome-suggestions {
    grid-template-columns: 1fr;
  }
}

.credit-name {
  color: var(--text-primary);
  font-weight: 600;
  background: linear-gradient(90deg, #ffffff 0%, #a8a8a8 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  text-decoration: none;
  transition: opacity 0.2s;
}

.credit-name:hover { opacity: 0.7; }

/* ============ Messages ============ */
.message {
  display: flex;
  gap: 16px;
  animation: fadeIn 0.2s ease;
}

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

.message-avatar {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: #fff;
  margin-top: 2px;
}

.message.assistant .message-avatar {
  background: linear-gradient(135deg, #10a37f, #0d8a6c);
}

.message.user .message-avatar {
  background: #5436da;
  order: 2;
}

.message-avatar svg { width: 15px; height: 15px; }

.message-body-wrap {
  min-width: 0;
  max-width: calc(100% - 60px);
  display: flex;
  flex-direction: column;
}

.message.user .message-body-wrap { align-items: flex-end; }

.message-content {
  font-size: 0.98rem;
  line-height: 1.75;
  color: var(--text-primary);
  word-break: break-word;
}

.message.assistant .message-content { padding: 2px 0; }

/* Professional Error Card */
.message-error-card {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  margin-top: 8px;
  background: rgba(239, 68, 68, 0.08);
  border: 1px solid rgba(239, 68, 68, 0.25);
  border-radius: var(--radius-md);
  color: #fca5a5;
  font-size: 0.85rem;
  line-height: 1.4;
}

.message-error-icon {
  flex-shrink: 0;
  color: #ef4444;
}

/* Streaming cursor effect */
.message.assistant.streaming .message-content::after {
  content: '▋';
  display: inline-block;
  margin-left: 2px;
  vertical-align: baseline;
  color: var(--text-primary);
  animation: cursorBlink 0.8s infinite;
}

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

.message.user .message-content {
  background: var(--surface);
  padding: 12px 16px;
  border-radius: 24px;
  border-bottom-right-radius: 8px;
  white-space: pre-wrap;
  max-width: 100%;
}

.message-content p { margin-bottom: 14px; }
.message-content p:last-child { margin-bottom: 0; }

.message-content pre {
  background: #0d0d0d;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin: 14px 0;
  overflow-x: auto;
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #1e1e1e;
  padding: 6px 12px;
  border-bottom: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

.code-copy-btn {
  background: transparent;
  border: none;
  color: var(--text-tertiary);
  cursor: pointer;
  font-size: 0.75rem;
  display: flex;
  align-items: center;
  gap: 5px;
}

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

.message-content code {
  font-family: var(--font-mono);
  background: rgba(255, 255, 255, 0.08);
  padding: 2px 6px;
  border-radius: 5px;
  font-size: 0.85rem;
}

.message-content pre code {
  background: transparent;
  padding: 12px;
  display: block;
}

.message-content ul { padding-left: 22px; margin-bottom: 14px; }
.message-content h1, .message-content h2, .message-content h3 { margin: 18px 0 10px; }
.message-content h1 { font-size: 1.4rem; }
.message-content h2 { font-size: 1.2rem; }
.message-content h3 { font-size: 1.05rem; }

.message-actions {
  display: flex;
  gap: 2px;
  margin-top: 4px;
  opacity: 0;
  transition: opacity 0.15s ease;
}

.message:hover .message-actions { opacity: 1; }

.msg-action-btn {
  background: transparent;
  border: none;
  color: var(--text-tertiary);
  padding: 4px 7px;
  border-radius: 6px;
  font-size: 0.75rem;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.msg-action-btn:hover { color: var(--text-primary); background: var(--surface); }

/* ============ Composer ============ */
.input-area-container {
  padding: 0 40px 16px;
  max-width: var(--content-max);
  width: 100%;
  margin: 0 auto;
  position: relative;
  z-index: 10;
}

.composer {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 12px 12px 8px;
  box-shadow: 0 8px 30px rgba(0,0,0,0.3);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.composer.dragover {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(16,163,127,0.2);
}

.attach-preview {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  padding: 4px 8px 8px;
}

.attach-thumb {
  position: relative;
  width: 64px;
  height: 64px;
  border-radius: 12px;
  overflow: hidden;
  background: var(--bg-main);
  border: 1px solid var(--border);
}

.attach-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.attach-thumb-remove {
  position: absolute;
  top: 4px;
  right: 4px;
  width: 18px;
  height: 18px;
  border: none;
  border-radius: 50%;
  background: rgba(0,0,0,0.7);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
}

.attach-thumb-remove:hover { background: #000; }

.drop-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.55);
  z-index: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}

.drop-overlay-card {
  border: 1.5px dashed rgba(255,255,255,0.35);
  border-radius: 16px;
  padding: 28px 40px;
  color: var(--text-primary);
  font-weight: 600;
  background: rgba(47,47,47,0.9);
}

.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.88);
  z-index: 1500;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px;
}

.lightbox img {
  max-width: 100%;
  max-height: 100%;
  border-radius: 8px;
  object-fit: contain;
}

.lightbox-close {
  position: absolute;
  top: 16px;
  right: 16px;
  background: transparent;
  border: none;
  color: #fff;
  padding: 8px;
  border-radius: 8px;
}

.lightbox-close:hover { background: rgba(255,255,255,0.1); }

.message-images {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 8px;
}

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

.message-images img {
  max-width: 220px;
  max-height: 180px;
  border-radius: 12px;
  object-fit: cover;
  cursor: zoom-in;
  border: 1px solid var(--border);
}

.composer:focus-within { border-color: rgba(255,255,255,0.25); }

.composer textarea {
  width: 100%;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.5;
  resize: none;
  outline: none;
  max-height: 200px;
  min-height: 26px;
  padding: 4px 8px 8px;
}

.composer textarea::placeholder { color: var(--text-tertiary); }

.composer-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 2px 4px;
}

.composer-tools {
  display: flex;
  align-items: center;
  gap: 4px;
}

.composer-tool {
  background: transparent;
  border: none;
  color: var(--text-tertiary);
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: color 0.15s ease, background 0.15s ease;
}

.composer-tool:hover { color: var(--text-primary); background: var(--bg-main); }

.composer-send-wrap {
  display: flex;
  align-items: center;
  gap: 6px;
}

.btn-send {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--text-tertiary);
  color: var(--bg-main);
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s ease, transform 0.1s ease;
}

.btn-send:disabled { background: var(--text-tertiary); opacity: 0.5; }
.btn-send:not(:disabled) { background: var(--text-primary); opacity: 1; }
.btn-send:not(:disabled):hover { transform: scale(1.05); }

.btn-stop {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--text-primary);
  color: var(--bg-main);
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-stop:hover { background: var(--text-secondary); }

.disclaimer {
  font-size: 0.72rem;
  color: var(--text-tertiary);
  text-align: center;
  margin-top: 10px;
}

/* ============ Dropdown menu (models) ============ */
.dropdown-menu {
  position: fixed;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: 0 16px 48px rgba(0,0,0,0.5);
  z-index: 500;
  padding: 6px;
  width: 320px;
  max-height: 70vh;
  overflow-y: auto;
  animation: fadeIn 0.12s ease;
}

.dropdown-section {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-tertiary);
  padding: 8px 12px 4px;
}

.dropdown-option {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.12s ease;
}

.dropdown-option:hover { background: var(--bg-main); }
.dropdown-option.selected { background: var(--bg-main); }

.dropdown-option-icon {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  flex-shrink: 0;
}

.dropdown-option-text {
  display: flex;
  flex-direction: column;
  min-width: 0;
  flex: 1;
}

.dropdown-option-name {
  font-size: 0.86rem;
  color: var(--text-primary);
  font-weight: 500;
}

.dropdown-option-desc {
  font-size: 0.74rem;
  color: var(--text-tertiary);
  line-height: 1.3;
}

.dropdown-option .check { color: var(--accent); display: inline-flex; flex-shrink: 0; }

/* ============ Context menu ============ */
.context-menu {
  position: fixed;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: 0 16px 48px rgba(0,0,0,0.5);
  z-index: 500;
  padding: 6px;
  min-width: 160px;
  animation: fadeIn 0.12s ease;
}

.context-item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  background: transparent;
  border: none;
  color: var(--text-primary);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.86rem;
  text-align: left;
}

.context-item:hover { background: var(--bg-main); }
.context-item.danger { color: var(--danger); }
.context-item.danger:hover { background: rgba(239,68,68,0.12); }

/* ============ Modals ============ */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  animation: fadeIn 0.15s ease;
}

.modal {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  width: 92%;
  max-width: 560px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 24px 60px rgba(0,0,0,0.6);
  overflow: hidden;
}

.modal-md { max-width: 680px; }

.modal-header {
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-header h2 {
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.modal-body {
  padding: 4px 20px 20px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.modal-footer {
  padding: 14px 20px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: flex-end;
}

.settings-group {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.settings-group h3 {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--text-tertiary);
}

.setting-desc { font-size: 0.8rem; color: var(--text-tertiary); }

.form-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-field label {
  font-size: 0.85rem;
  font-weight: 500;
}

.form-field label small { color: var(--text-tertiary); font-weight: 400; }

.form-field input[type="password"],
.form-field input[type="text"],
.form-field textarea {
  background: var(--bg-main);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.9rem;
  outline: none;
  transition: border-color 0.15s ease;
}

.form-field input:focus,
.form-field textarea:focus { border-color: rgba(255,255,255,0.3); }

.form-field input[type="range"] {
  accent-color: var(--accent);
  cursor: pointer;
}

.button-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.btn {
  padding: 9px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 500;
  border: none;
  transition: background 0.15s ease;
}

.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); }

.btn-secondary {
  background: var(--bg-main);
  color: var(--text-primary);
  border: 1px solid var(--border);
}
.btn-secondary:hover { background: var(--surface-hover); }

.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: var(--danger-hover); }

/* ============ Toast ============ */
.toast-container {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  z-index: 2000;
}

.toast {
  background: var(--surface);
  color: var(--text-primary);
  border: 1px solid var(--border);
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 0.85rem;
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
  animation: fadeInUp 0.2s ease;
}

.toast.ok { border-color: var(--accent); }
.toast.err { border-color: var(--danger); }

/* ============ Animations ============ */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

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

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

.streaming-cursor::after {
  content: '';
  display: inline-block;
  width: 8px;
  height: 17px;
  background: var(--text-primary);
  margin-left: 2px;
  vertical-align: -3px;
  border-radius: 2px;
  animation: blink 0.9s infinite;
}

/* ============ Mobile ============ */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    box-shadow: 4px 0 20px rgba(0,0,0,0.5);
  }

  .sidebar-open-mobile { display: inline-flex; }

  .chat-messages { padding: 16px 16px 32px; }
  .input-area-container { padding: 0 12px 12px; }

  .sidebar-credit { display: flex; }
  .brand-badge { display: none; }
}

/* ============ Brand badge (topbar) ============ */
.brand-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 10px 4px 6px;
  margin-left: 4px;
  border-radius: 999px;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.9rem;
  letter-spacing: -0.01em;
  transition: background 0.15s ease;
  cursor: pointer;
  user-select: none;
}

.brand-badge:hover { background: var(--surface); }

.brand-logo {
  width: 24px;
  height: 24px;
  display: block;
  flex-shrink: 0;
}

.brand-name {
  background: linear-gradient(90deg, #ffffff 0%, #b0b0b0 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ============ Sidebar credit footer ============ */
.sidebar-credit {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  margin: 6px 8px 10px;
  font-size: 0.78rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  user-select: none;
}

.sidebar-credit-logo {
  width: 18px;
  height: 18px;
  opacity: 0.85;
  flex-shrink: 0;
}

.sidebar-credit .credit-name {
  font-weight: 600;
  font-size: 0.82rem;
}
}