/* ══════════════════════════════════════════════
   NOVAMIND — Grok-Inspired Design System
   ══════════════════════════════════════════════ */
:root {
  --bg: #0a0a0a;
  --bg-surface: #141414;
  --bg-elevated: #1a1a1a;
  --bg-input: #1e1e1e;
  --bg-hover: #242424;
  --border: rgba(255,255,255,0.06);
  --border-hover: rgba(255,255,255,0.12);
  --text: #e8e8e8;
  --text-muted: #888;
  --text-dim: #555;
  --accent: #8b5cf6;
  --accent2: #06b6d4;
  --accent3: #f59e0b;
  --success: #22c55e;
  --danger: #ef4444;
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 0.1s ease;
}

* { margin:0; padding:0; box-sizing:border-box; }
html, body { height:100%; overflow:hidden; }
body {
  font-family:'Inter',-apple-system,BlinkMacSystemFont,sans-serif;
  background:var(--bg);
  background-image:radial-gradient(ellipse at 50% 0%, rgba(139,92,246,0.06) 0%, transparent 60%);
  color:var(--text);
  -webkit-font-smoothing:antialiased;
}
/* Eliminate 300ms tap delay on all interactive elements */
button, a, .pill, .welcome-card, .conv-item, .model-option, .model-selector,
.agent-preset, .msg-action-btn, .input-tool-btn, .header-icon-btn {
  touch-action:manipulation;
  -webkit-tap-highlight-color:transparent;
}
.hidden { display:none !important; }

/* ── App Container ── */
.app-container {
  display:flex;
  height:100vh;
  height:100dvh;
  position:relative;
}

/* ══════════════════════════════════════════════
   SIDEBAR — Sliding Drawer
   ══════════════════════════════════════════════ */
.sidebar-overlay {
  position:fixed; inset:0;
  background:rgba(0,0,0,0.6);
  z-index:90; opacity:0;
  pointer-events:none;
  transition:opacity 0.15s;
}
.sidebar-overlay.active { opacity:1; pointer-events:all; }

.sidebar {
  position:fixed; left:0; top:0; bottom:0;
  width:280px; background:var(--bg-surface);
  border-right:1px solid var(--border);
  z-index:100;
  display:flex; flex-direction:column;
  transform:translate3d(-100%,0,0);
  transition:transform 0.15s cubic-bezier(0.4,0,0.2,1);
  will-change:transform;
}
.sidebar.open { transform:translate3d(0,0,0); }

.sidebar-header {
  display:flex; align-items:center; gap:10px;
  padding:16px; border-bottom:1px solid var(--border);
}
.sidebar-logo { font-size:1.4rem; }
.sidebar-brand { font-weight:800; font-size:1rem; color:#fff; flex:1; }
.sidebar-close {
  background:none; border:none; color:var(--text-muted);
  cursor:pointer; font-size:1rem; padding:4px;
  transition:color var(--transition);
}
.sidebar-close:hover { color:#fff; }

.btn-new-chat {
  margin:12px 16px 8px;
  background:var(--accent); color:#fff;
  border:none; border-radius:var(--radius);
  padding:10px; font-weight:700; font-size:0.85rem;
  cursor:pointer; display:flex; align-items:center;
  justify-content:center; gap:8px;
  transition:all var(--transition);
}
.btn-new-chat:hover { background:#7c4ddb; }

.sidebar-section-label {
  padding:12px 16px 4px;
  font-size:0.65rem; font-weight:700;
  color:var(--text-dim); text-transform:uppercase;
  letter-spacing:1px;
}

/* Model Selector in Sidebar */
.model-selector {
  display:flex; align-items:center; gap:8px;
  margin:4px 16px 8px; padding:10px 12px;
  background:var(--bg-elevated); border:1px solid var(--border);
  border-radius:var(--radius-sm); cursor:pointer;
  transition:all var(--transition); font-size:0.85rem; font-weight:600;
}
.model-selector:hover { border-color:var(--border-hover); background:var(--bg-hover); }
.model-dot { width:8px; height:8px; border-radius:50%; background:var(--success); }

/* Model Picker */
.model-picker {
  position:absolute; top:auto; left:16px; right:16px;
  background:var(--bg-elevated); border:1px solid var(--border);
  border-radius:var(--radius); padding:8px;
  box-shadow:0 20px 60px rgba(0,0,0,0.5);
  display:none; z-index:110;
  max-height:400px; overflow-y:auto;
}
.model-picker.open { display:block; }
.model-picker-header {
  padding:8px 12px; font-size:0.7rem; font-weight:700;
  color:var(--text-dim); text-transform:uppercase; letter-spacing:1px;
}
.model-option {
  display:flex; align-items:center; gap:10px;
  padding:10px 12px; border-radius:var(--radius-sm);
  cursor:pointer; transition:background var(--transition);
}
.model-option:hover { background:var(--bg-hover); }
.model-option.active { background:rgba(139,92,246,0.1); }
.mo-icon {
  width:36px; height:36px; border-radius:8px;
  background:rgba(255,255,255,0.04);
  display:flex; align-items:center; justify-content:center;
  font-size:0.9rem; flex-shrink:0;
}
.mo-info { flex:1; min-width:0; }
.mo-name {
  font-size:0.82rem; font-weight:700; color:#fff;
  display:flex; align-items:center; gap:8px;
}
.mo-badge {
  font-size:0.5rem; font-weight:800;
  padding:2px 5px; border-radius:3px;
  text-transform:uppercase; letter-spacing:0.5px;
}
.mo-provider { font-size:0.65rem; color:var(--text-dim); font-weight:500; margin-top:1px; }
.mo-desc { font-size:0.7rem; color:var(--text-muted); margin-top:2px; }
.mo-check { font-size:0.8rem; flex-shrink:0; }

/* Conversation List */
.conv-list {
  flex:1; overflow-y:auto; padding:4px 8px;
  scrollbar-width:thin; scrollbar-color:var(--border) transparent;
}
.conv-item {
  display:flex; align-items:center; gap:8px;
  padding:8px 12px; border-radius:var(--radius-sm);
  cursor:pointer; font-size:0.8rem; color:var(--text-muted);
  transition:all var(--transition);
}
.conv-item:hover { background:var(--bg-hover); color:var(--text); }
.conv-item.active { background:rgba(139,92,246,0.1); color:#fff; }
.conv-item .conv-title { flex:1; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.conv-item .conv-delete {
  opacity:0; background:none; border:none;
  color:var(--text-dim); cursor:pointer; font-size:0.7rem; padding:4px;
}
.conv-item:hover .conv-delete { opacity:1; }

.sidebar-footer {
  padding:12px 16px; border-top:1px solid var(--border);
  display:flex; align-items:center; gap:10px;
}
.user-avatar {
  width:32px; height:32px; border-radius:8px;
  background:linear-gradient(135deg,var(--accent),var(--accent2));
  display:flex; align-items:center; justify-content:center;
  font-size:0.75rem; font-weight:800; color:#fff; flex-shrink:0;
}
.user-info { flex:1; min-width:0; }
.user-name { font-size:0.8rem; font-weight:700; color:#fff; }
.user-plan { font-size:0.6rem; color:var(--text-dim); text-transform:uppercase; font-weight:700; }
.usage-badge {
  display:flex; align-items:center; gap:4px;
  font-size:0.65rem; color:var(--accent); font-weight:700;
}
.btn-auth {
  background:none; border:none; color:var(--text-muted);
  cursor:pointer; font-size:0.9rem; padding:4px;
}

/* ══════════════════════════════════════════════
   MAIN AREA
   ══════════════════════════════════════════════ */
.main-area {
  flex:1; display:flex; flex-direction:column;
  min-width:0; position:relative;
}

/* ── Header ── */
.main-header {
  display:flex; align-items:center;
  padding:12px 16px; gap:12px;
  border-bottom:1px solid var(--border);
  background:var(--bg);
  position:sticky; top:0; z-index:10;
}
.header-brand {
  font-weight:800; font-size:1.05rem; color:#fff; flex:1;
}
.header-icon-btn {
  background:none; border:none; color:var(--text-muted);
  cursor:pointer; font-size:1rem; padding:8px;
  border-radius:var(--radius-sm);
  transition:all var(--transition);
}
.header-icon-btn:hover { color:#fff; background:var(--bg-hover); }
.header-right { display:flex; align-items:center; gap:4px; }

/* ── Chat Area ── */
.chat-area {
  flex:1; overflow-y:auto; padding:0;
  display:flex; flex-direction:column;
  scroll-behavior:smooth;
}

/* ── Welcome Screen ── */
.welcome-screen {
  flex:1; display:flex; flex-direction:column;
  align-items:center; justify-content:center;
  padding:40px 20px; text-align:center;
}
.welcome-logo {
  font-size:4rem; margin-bottom:20px;
  opacity:0.4; animation:float 4s ease-in-out infinite;
}
@keyframes float {
  0%,100% { transform:translateY(0); }
  50% { transform:translateY(-8px); }
}
.welcome-title {
  font-size:1.8rem; font-weight:800; color:#fff;
  margin-bottom:8px;
  background:linear-gradient(135deg,#fff,#8b5cf6);
  -webkit-background-clip:text; -webkit-text-fill-color:transparent;
  background-clip:text;
}
.welcome-subtitle {
  font-size:0.85rem; color:var(--text-muted);
  max-width:400px; margin-bottom:32px; line-height:1.6;
}
.welcome-cards {
  display:grid; grid-template-columns:repeat(2,1fr);
  gap:10px; max-width:420px; width:100%;
}
.welcome-card {
  background:var(--bg-surface); border:1px solid var(--border);
  border-radius:var(--radius); padding:16px;
  cursor:pointer; text-align:left;
  transition:all 0.1s ease;
}
.welcome-card:hover { border-color:var(--accent); background:rgba(139,92,246,0.06); transform:translateY(-2px); }
.wc-icon { font-size:1.3rem; margin-bottom:8px; }
.wc-title { font-size:0.8rem; font-weight:700; color:#fff; }

/* ══════════════════════════════════════════════
   MESSAGES — Grok-Style
   ══════════════════════════════════════════════ */
.messages-container {
  flex:1; padding:16px; max-width:720px;
  margin:0 auto; width:100%;
}

/* User message — right-aligned bubble */
.msg-user {
  display:flex; justify-content:flex-end; margin-bottom:8px;
}
.msg-user-bubble {
  background:var(--bg-elevated); color:var(--text);
  padding:10px 16px; border-radius:20px 20px 4px 20px;
  max-width:80%; font-size:0.9rem; line-height:1.5;
  border:1px solid var(--border);
}

/* AI message — left-aligned, clean */
.msg-ai {
  margin-bottom:20px; padding:0;
}
.msg-ai-body {
  font-size:0.9rem; line-height:1.8; color:var(--text);
  overflow-wrap:break-word;
}
.msg-ai-body h1,.msg-ai-body h2,.msg-ai-body h3,.msg-ai-body h4 { color:#fff; margin:16px 0 8px; }
.msg-ai-body h2 { font-size:1.1rem; }
.msg-ai-body h3 { font-size:1rem; }
.msg-ai-body strong { color:#fff; }
.msg-ai-body code {
  background:rgba(139,92,246,0.12); color:#c4b5fd;
  padding:2px 6px; border-radius:4px; font-size:0.82rem;
  font-family:'Fira Code','Cascadia Code',monospace;
}
.msg-ai-body pre {
  background:var(--bg-surface); border:1px solid var(--border);
  border-radius:var(--radius-sm); padding:14px;
  overflow-x:auto; margin:12px 0; position:relative;
}
.msg-ai-body pre code { background:none; padding:0; color:#e2e8f0; font-size:0.8rem; }
.msg-ai-body blockquote {
  border-left:3px solid var(--accent); padding:8px 16px;
  margin:12px 0; color:var(--text-muted); font-style:italic;
  background:rgba(139,92,246,0.04); border-radius:0 var(--radius-sm) var(--radius-sm) 0;
}
.msg-ai-body a { color:var(--accent2); text-decoration:none; }
.msg-ai-body a:hover { text-decoration:underline; }
.msg-ai-body ul,.msg-ai-body ol { padding-left:20px; margin:8px 0; }
.msg-ai-body li { margin:4px 0; }
.msg-ai-body table { width:100%; border-collapse:collapse; margin:12px 0; font-size:0.82rem; }
.msg-ai-body th,.msg-ai-body td {
  padding:8px 12px; border:1px solid var(--border); text-align:left;
}
.msg-ai-body th { background:var(--bg-surface); color:#fff; font-weight:700; }
.msg-ai-body img {
  max-width:100%; border-radius:var(--radius);
  margin:12px 0; box-shadow:0 4px 20px rgba(0,0,0,0.3);
  cursor:pointer;
}

/* AI action buttons */
.msg-actions {
  display:flex; align-items:center; gap:2px;
  margin-top:8px; padding-top:4px;
}
.msg-action-btn {
  background:none; border:none; color:var(--text-dim);
  cursor:pointer; font-size:0.75rem; padding:6px 8px;
  border-radius:var(--radius-sm);
  transition:all var(--transition);
}
.msg-action-btn:hover { color:#fff; background:var(--bg-hover); }
.msg-time-badge {
  margin-left:auto; font-size:0.65rem; color:var(--text-dim);
}

/* Follow-up suggestions */
.msg-followups {
  display:flex; flex-wrap:wrap; gap:6px; margin-top:10px;
  padding-top:10px; border-top:1px solid var(--border);
}
.followup-pill {
  background:none; border:1px solid var(--border);
  color:var(--text-muted); font-size:0.75rem;
  padding:6px 12px; border-radius:20px; cursor:pointer;
  transition:all var(--transition);
  display:flex; align-items:center; gap:6px;
}
.followup-pill:hover { border-color:var(--border-hover); color:#fff; background:var(--bg-hover); }
.followup-pill i { font-size:0.6rem; color:var(--text-dim); }

/* Typing indicator */
.typing-indicator { display:flex; gap:4px; padding:8px 0; }
.typing-indicator span {
  width:6px; height:6px; border-radius:50%; background:var(--text-dim);
  animation:typing 1.4s infinite;
}
.typing-indicator span:nth-child(2) { animation-delay:0.2s; }
.typing-indicator span:nth-child(3) { animation-delay:0.4s; }
@keyframes typing {
  0%,60%,100% { opacity:0.3; transform:translateY(0); }
  30% { opacity:1; transform:translateY(-4px); }
}

/* Copy button in code blocks */
.code-block-wrapper { position:relative; }
.code-copy-btn {
  position:absolute; top:8px; right:8px;
  background:var(--bg-hover); border:1px solid var(--border);
  color:var(--text-muted); padding:4px 10px;
  border-radius:6px; font-size:0.65rem; cursor:pointer;
  opacity:0; transition:all var(--transition);
}
.code-block-wrapper:hover .code-copy-btn { opacity:1; }
.code-copy-btn:hover { color:#fff; background:var(--bg-elevated); }

/* ══════════════════════════════════════════════
   FEATURE PILLS
   ══════════════════════════════════════════════ */
.feature-pills {
  display:flex; gap:8px; padding:8px 16px;
  overflow-x:auto; scrollbar-width:none;
  max-width:720px; margin:0 auto; width:100%;
}
.feature-pills::-webkit-scrollbar { display:none; }
.pill {
  background:var(--bg-elevated); border:1px solid var(--border);
  color:var(--text-muted); font-size:0.78rem; font-weight:600;
  padding:8px 14px; border-radius:20px; cursor:pointer;
  white-space:nowrap; display:flex; align-items:center; gap:6px;
  transition:all var(--transition);
}
.pill:hover { border-color:var(--border-hover); color:#fff; background:var(--bg-hover); }
.pill.active { border-color:var(--accent); color:var(--accent); background:rgba(139,92,246,0.1); }

/* ══════════════════════════════════════════════
   INPUT AREA
   ══════════════════════════════════════════════ */
.input-area {
  padding:0 16px 16px;
  max-width:720px; margin:0 auto; width:100%;
}
.input-container {
  background:var(--bg-surface);
  border:1px solid var(--border);
  border-radius:20px;
  transition:border-color var(--transition);
}
.input-container:focus-within { border-color:var(--border-hover); }
.input-top {
  display:flex; align-items:flex-end;
  padding:10px 14px 4px;
}
.chat-input {
  flex:1; background:none; border:none; outline:none;
  color:var(--text); font-size:16px; font-family:inherit;
  resize:none; line-height:1.5; max-height:160px;
  scrollbar-width:none;
}
.chat-input::placeholder { color:var(--text-dim); }
.btn-send {
  width:32px; height:32px; border-radius:50%;
  background:var(--accent); border:none; color:#fff;
  cursor:pointer; display:flex; align-items:center;
  justify-content:center; font-size:0.8rem;
  flex-shrink:0; opacity:0.4;
  transition:all var(--transition);
}
.btn-send.active { opacity:1; }
.btn-send:hover { transform:scale(1.05); }
.input-bottom {
  display:flex; align-items:center; justify-content:space-between;
  padding:4px 10px 8px;
}
.input-tools { display:flex; align-items:center; gap:4px; }
.input-tool-btn {
  background:none; border:none; color:var(--text-dim);
  cursor:pointer; font-size:0.78rem; padding:4px 8px;
  border-radius:var(--radius-sm);
  transition:all var(--transition);
  display:flex; align-items:center; gap:4px;
}
.input-tool-btn:hover { color:#fff; background:var(--bg-hover); }
.active-model-pill {
  background:var(--bg-elevated); border:1px solid var(--border) !important;
  border-radius:20px !important; padding:4px 10px !important;
  font-size:0.72rem !important; font-weight:600;
}

/* ══════════════════════════════════════════════
   CUSTOM AGENT MODAL
   ══════════════════════════════════════════════ */
.modal-overlay {
  position:fixed; inset:0; background:rgba(0,0,0,0.7);
  z-index:200; display:flex; align-items:center;
  justify-content:center;
}
.agent-modal {
  background:var(--bg-surface); border:1px solid var(--border);
  border-radius:16px; width:90%; max-width:420px;
  overflow:hidden;
}
.agent-header {
  display:flex; align-items:center; padding:16px;
  border-bottom:1px solid var(--border);
}
.agent-header h3 { flex:1; text-align:center; font-size:0.9rem; font-weight:700; }
.agent-close,.agent-save {
  background:none; border:none; cursor:pointer;
  font-size:1rem; padding:4px;
  color:var(--text-muted); transition:color var(--transition);
}
.agent-close:hover { color:var(--danger); }
.agent-save:hover { color:var(--success); }
.agent-body { padding:20px; }
.agent-label {
  font-size:0.7rem; font-weight:700; color:var(--accent);
  text-transform:uppercase; letter-spacing:0.5px;
  margin-bottom:6px; display:block;
}
.agent-input,.agent-textarea {
  width:100%; background:var(--bg-elevated);
  border:1px solid var(--border); border-radius:var(--radius-sm);
  padding:12px; color:var(--text); font-size:16px;
  font-family:inherit; outline:none; margin-bottom:16px;
  transition:border-color var(--transition);
}
.agent-input:focus,.agent-textarea:focus { border-color:var(--border-hover); }
.agent-textarea { resize:none; min-height:100px; }
.agent-presets { display:flex; gap:6px; flex-wrap:wrap; }
.agent-preset {
  background:var(--bg-elevated); border:1px solid var(--border);
  color:var(--text-muted); font-size:0.75rem; font-weight:600;
  padding:6px 14px; border-radius:20px; cursor:pointer;
  transition:all var(--transition);
}
.agent-preset:hover { border-color:var(--border-hover); color:#fff; }
.agent-preset.active { border-color:var(--accent); color:var(--accent); background:rgba(139,92,246,0.1); }

/* ══════════════════════════════════════════════
   AUTH MODAL
   ══════════════════════════════════════════════ */
.auth-overlay {
  position:fixed; inset:0; background:rgba(0,0,0,0.7);
  z-index:200; display:flex; align-items:center;
  justify-content:center;
}
.auth-modal {
  background:var(--bg-surface); border:1px solid var(--border);
  border-radius:16px; padding:32px; width:90%; max-width:380px;
  position:relative;
}
.auth-close {
  position:absolute; top:12px; right:12px;
  background:none; border:none; color:var(--text-dim);
  cursor:pointer; font-size:1rem;
}
.auth-logo { font-size:2rem; text-align:center; margin-bottom:12px; }
.auth-title { font-size:1.1rem; font-weight:800; text-align:center; color:#fff; margin-bottom:4px; }
.auth-subtitle { font-size:0.8rem; color:var(--text-muted); text-align:center; margin-bottom:20px; }
.auth-form { display:flex; flex-direction:column; gap:12px; }
.auth-field label {
  font-size:0.7rem; font-weight:700; color:var(--text-muted);
  text-transform:uppercase; letter-spacing:0.5px; margin-bottom:4px; display:block;
}
.auth-field input {
  width:100%; background:var(--bg-elevated); border:1px solid var(--border);
  border-radius:var(--radius-sm); padding:10px 12px;
  color:var(--text); font-size:0.85rem; outline:none;
  transition:border-color var(--transition);
}
.auth-field input:focus { border-color:var(--accent); }
.auth-error {
  background:rgba(239,68,68,0.1); border:1px solid rgba(239,68,68,0.2);
  color:var(--danger); padding:8px 12px; border-radius:var(--radius-sm);
  font-size:0.8rem;
}
.auth-submit {
  background:var(--accent); color:#fff; border:none;
  border-radius:var(--radius-sm); padding:12px;
  font-weight:700; font-size:0.85rem; cursor:pointer;
  transition:background var(--transition);
}
.auth-submit:hover { background:#7c4ddb; }
.auth-toggle {
  text-align:center; margin-top:16px; font-size:0.8rem;
  color:var(--text-muted);
}
.auth-toggle-btn {
  background:none; border:none; color:var(--accent);
  cursor:pointer; font-weight:700; font-size:0.8rem;
}

/* Voice recording state */
.recording .btn-mic,
.recording #btn-speak {
  color:var(--danger) !important;
  animation:pulse-record 1s infinite;
}
@keyframes pulse-record {
  0%,100% { opacity:1; }
  50% { opacity:0.5; }
}

/* ══════════════════════════════════════════════
   RESPONSIVE
   ══════════════════════════════════════════════ */
@media (max-width:768px) {
  .welcome-title { font-size:1.3rem; }
  .welcome-cards { grid-template-columns:1fr 1fr; gap:6px; }
  .feature-pills { padding:6px 12px; }
  .input-area { padding:0 12px 12px; }
}
@media (max-width:480px) {
  .welcome-cards { grid-template-columns:1fr; }
}