/* ===================== RESET & ROOT ===================== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg: #080b12;
  --sidebar-bg: #0d1020;
  --surface: rgba(13, 16, 32, 0.92);
  --border: rgba(255,255,255,0.07);
  --border-hover: rgba(255,255,255,0.15);
  --text: #e8eaf6;
  --text-muted: rgba(232, 234, 246, 0.38);
  --text-dim: rgba(232, 234, 246, 0.6);
  --accent-1: #5b8af5;
  --accent-2: #8e5cf5;
  --accent-grad: linear-gradient(135deg, #5b8af5, #8e5cf5);
  --user-bubble: linear-gradient(135deg, rgba(91,138,245,0.55), rgba(142,92,245,0.5));
  --bot-bubble: rgba(255,255,255,0.055);
  --sidebar-w: 240px;
  --header-h: 58px;
}

body {
  min-height: 100vh;
  background: var(--bg);
  font-family: 'Syne', sans-serif;
  color: var(--text);
  overflow: hidden;
}

/* ===================== BACKGROUND ===================== */
.bg-canvas {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
}

.orb {
  position: absolute; border-radius: 50%;
  filter: blur(110px); opacity: 0.18;
}
.orb1 { width: 700px; height: 700px; background: radial-gradient(circle, #3d6ef0, transparent); top: -250px; left: -200px; }
.orb2 { width: 550px; height: 550px; background: radial-gradient(circle, #7c3ff0, transparent); bottom: -180px; right: -120px; }
.orb3 { width: 350px; height: 350px; background: radial-gradient(circle, #e040a0 50%, transparent); top: 45%; left: 45%; opacity: 0.12; }

.grid-overlay {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 48px 48px;
}

/* ===================== LAYOUT ===================== */
.app-layout {
  position: relative; z-index: 10;
  display: flex;
  height: 100vh;
  width: 100vw;
}

/* ===================== SIDEBAR ===================== */
.sidebar {
  width: var(--sidebar-w);
  min-width: var(--sidebar-w);
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  transition: transform 0.3s cubic-bezier(.4,0,.2,1), width 0.3s;
  overflow: hidden;
  z-index: 20;
}

.sidebar.collapsed {
  width: 0;
  min-width: 0;
  transform: translateX(calc(-1 * var(--sidebar-w)));
}

.sidebar-header {
  padding: 18px 16px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
}

.sidebar-logo {
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.12em;
  background: var(--accent-grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.new-chat-btn {
  font-family: 'Syne', sans-serif;
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 5px 11px;
  cursor: pointer;
  transition: all 0.2s;
}
.new-chat-btn:hover { background: rgba(255,255,255,0.1); color: var(--text); border-color: var(--border-hover); }

.history-label {
  font-family: 'Inconsolata', monospace;
  font-size: 9.5px;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--text-muted);
  padding: 14px 16px 8px;
}

.history-list {
  flex: 1;
  overflow-y: auto;
  padding: 4px 8px 8px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.history-list::-webkit-scrollbar { width: 3px; }
.history-list::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 10px; }

.history-item {
  padding: 9px 10px;
  border-radius: 9px;
  cursor: pointer;
  font-size: 12.5px;
  font-weight: 500;
  color: var(--text-dim);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: all 0.18s;
  border: 1px solid transparent;
  display: flex;
  align-items: center;
  gap: 8px;
}

.history-item .chat-icon { font-size: 12px; opacity: 0.6; flex-shrink: 0; }
.history-item .chat-label { overflow: hidden; text-overflow: ellipsis; }

.history-item:hover { background: rgba(255,255,255,0.06); color: var(--text); border-color: var(--border); }
.history-item.active { background: rgba(91,138,245,0.12); color: var(--text); border-color: rgba(91,138,245,0.3); }

.history-item .delete-session {
  margin-left: auto;
  flex-shrink: 0;
  font-size: 14px;
  opacity: 0;
  color: var(--text-muted);
  transition: opacity 0.15s;
  line-height: 1;
}
.history-item:hover .delete-session { opacity: 1; }
.history-item .delete-session:hover { color: #f06292; }

.sidebar-footer {
  padding: 12px 16px;
  border-top: 1px solid var(--border);
}

.model-badge {
  font-family: 'Inconsolata', monospace;
  font-size: 10px;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

/* ===================== CHAT MAIN ===================== */
.chat-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  height: 100vh;
}

/* ===================== HEADER ===================== */
.chat-header {
  height: var(--header-h);
  padding: 0 20px;
  border-bottom: 1px solid var(--border);
  background: rgba(8,11,18,0.7);
  backdrop-filter: blur(16px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-shrink: 0;
}

.sidebar-toggle {
  background: none; border: none;
  color: var(--text-muted); font-size: 17px;
  cursor: pointer; padding: 6px; border-radius: 8px;
  transition: all 0.2s;
  line-height: 1;
}
.sidebar-toggle:hover { background: rgba(255,255,255,0.07); color: var(--text); }

.header-center {
  display: flex; align-items: center; gap: 12px;
}

.header-title {
  font-size: 15px; font-weight: 700;
  letter-spacing: 0.04em;
}

.status-pill {
  font-family: 'Inconsolata', monospace;
  font-size: 9px; font-weight: 600;
  letter-spacing: 0.14em;
  color: #4ade80;
  background: rgba(74,222,128,0.1);
  border: 1px solid rgba(74,222,128,0.25);
  border-radius: 20px;
  padding: 3px 9px;
  display: flex; align-items: center; gap: 5px;
}

.pulse {
  width: 5px; height: 5px;
  background: #4ade80; border-radius: 50%;
  animation: pulseAnim 2s ease-in-out infinite;
}
@keyframes pulseAnim {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.7); }
}

.clear-btn {
  background: none; border: none;
  color: var(--text-muted); font-size: 18px;
  cursor: pointer; padding: 6px 8px; border-radius: 8px;
  transition: all 0.2s;
}
.clear-btn:hover { background: rgba(255,255,255,0.07); color: var(--text); }

/* ===================== MESSAGES ===================== */
.chat-messages {
  flex: 1;
  padding: 28px 28px 16px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.chat-messages::-webkit-scrollbar { width: 4px; }
.chat-messages::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.12); border-radius: 10px; }

/* Welcome */
.welcome-msg {
  text-align: center;
  margin: auto;
  padding: 40px 20px;
  max-width: 480px;
}

.welcome-icon {
  width: 64px; height: 64px;
  background: var(--accent-grad);
  border-radius: 20px;
  display: flex; align-items: center; justify-content: center;
  font-size: 30px;
  margin: 0 auto 20px;
  box-shadow: 0 8px 32px rgba(91,138,245,0.3);
}

.welcome-msg h2 {
  font-size: 26px; font-weight: 800;
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}

.welcome-msg p {
  font-size: 13px; color: var(--text-muted);
  font-family: 'Inconsolata', monospace;
  margin-bottom: 28px;
}

.suggestions {
  display: flex; flex-wrap: wrap;
  gap: 8px; justify-content: center;
  margin-top: 4px;
}

.suggestion-chip {
  font-family: 'Syne', sans-serif;
  font-size: 12px; font-weight: 500;
  color: var(--text-dim);
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 7px 14px;
  cursor: pointer;
  transition: all 0.2s;
}
.suggestion-chip:hover {
  background: rgba(91,138,245,0.15);
  border-color: rgba(91,138,245,0.35);
  color: var(--text);
}

/* Messages */
.message {
  display: flex; gap: 12px;
  animation: msgIn 0.35s cubic-bezier(.4,0,.2,1);
}

.message.user { flex-direction: row-reverse; }

@keyframes msgIn {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: translateY(0); }
}

.avatar {
  width: 30px; height: 30px;
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 14px; flex-shrink: 0;
  margin-top: 2px;
}

.message.bot .avatar { background: var(--accent-grad); color: white; }
.message.user .avatar { background: linear-gradient(135deg, #f06292, #c945e0); color: white; }

.bubble {
  max-width: 70%;
  padding: 12px 16px;
  border-radius: 16px;
  font-size: 14px; line-height: 1.7;
  font-family: 'Syne', sans-serif;
  font-weight: 400;
}

.message.bot .bubble {
  background: var(--bot-bubble);
  border: 1px solid var(--border);
  border-bottom-left-radius: 5px;
  color: var(--text);
}

.message.user .bubble {
  background: var(--user-bubble);
  border: 1px solid rgba(91,138,245,0.2);
  border-bottom-right-radius: 5px;
  color: #fff;
}

.bubble code {
  font-family: 'Inconsolata', monospace;
  font-size: 12.5px;
  background: rgba(0,0,0,0.3);
  padding: 1px 6px;
  border-radius: 4px;
}

.bubble strong { font-weight: 700; }
.bubble em { font-style: italic; color: var(--text-dim); }

/* Thinking */
.thinking-bubble {
  background: var(--bot-bubble);
  border: 1px solid var(--border);
  border-bottom-left-radius: 5px;
  padding: 12px 18px;
  border-radius: 16px;
  display: flex; align-items: center; gap: 10px;
  color: var(--text-muted);
  font-size: 13px;
  font-family: 'Inconsolata', monospace;
}

.dots { display: flex; gap: 5px; }
.dot {
  width: 5px; height: 5px;
  background: #8e5cf5; border-radius: 50%;
  animation: dotBounce 1.3s infinite ease-in-out;
}
.dot:nth-child(2) { animation-delay: 0.18s; }
.dot:nth-child(3) { animation-delay: 0.36s; }
@keyframes dotBounce {
  0%, 100% { transform: translateY(0); opacity: 0.5; }
  50% { transform: translateY(-6px); opacity: 1; }
}

/* ===================== INPUT ===================== */
.input-area {
  padding: 14px 20px 16px;
  border-top: 1px solid var(--border);
  background: rgba(8,11,18,0.7);
  backdrop-filter: blur(16px);
  display: flex; align-items: flex-end; gap: 10px;
  flex-shrink: 0;
}

.input-shell {
  flex: 1;
  background: rgba(255,255,255,0.045);
  border: 1px solid var(--border);
  border-radius: 16px;
  transition: border-color 0.2s, box-shadow 0.2s;
  overflow: hidden;
}

.input-shell:focus-within {
  border-color: rgba(91,138,245,0.45);
  box-shadow: 0 0 0 3px rgba(91,138,245,0.1);
}

#user-input {
  width: 100%; background: transparent; border: none; outline: none;
  padding: 13px 16px 6px;
  color: var(--text);
  font-family: 'Syne', sans-serif;
  font-size: 14px; line-height: 1.6;
  resize: none; max-height: 140px;
}

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

.input-footer {
  padding: 0 16px 10px;
  display: flex; align-items: center; justify-content: space-between;
}

.char-count {
  font-family: 'Inconsolata', monospace;
  font-size: 10.5px; color: var(--text-muted);
}
.char-count.warn { color: #f06292; }

.hint {
  font-family: 'Inconsolata', monospace;
  font-size: 10px; color: var(--text-muted);
  letter-spacing: 0.02em;
}

.send-btn {
  width: 46px; height: 46px;
  border: none; border-radius: 14px;
  background: var(--accent-grad);
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  transition: transform 0.15s, box-shadow 0.2s;
  box-shadow: 0 4px 18px rgba(91,138,245,0.35);
}
.send-btn:hover { transform: translateY(-1px); box-shadow: 0 6px 24px rgba(91,138,245,0.5); }
.send-btn:active { transform: translateY(0); }
.send-btn:disabled { opacity: 0.5; transform: none; cursor: not-allowed; }
.send-btn svg { width: 17px; fill: white; }

/* ===================== RESPONSIVE ===================== */
@media (max-width: 600px) {
  .sidebar { position: fixed; top: 0; left: 0; height: 100vh; z-index: 100; }
  .sidebar.collapsed { transform: translateX(-100%); width: var(--sidebar-w); min-width: var(--sidebar-w); }
  .chat-messages { padding: 18px 14px 10px; }
  .bubble { max-width: 86%; font-size: 13.5px; }
  .app-layout { overflow: hidden; }
}