@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&display=swap');

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

:root {
  --indigo: #6366f1;
  --indigo-light: #eef2ff;
  --indigo-hover: #4f46e5;
  --text-primary: #18181b;
  --text-secondary: #71717a;
  --border: rgba(0, 0, 0, 0.07);
  --bubble-bot: #f4f4f5;
  --white: #ffffff;
  --radius-card: 24px;
  --radius-bubble: 18px;
}

html, body {
  height: 100%;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: #fafafa;
  background-image: radial-gradient(circle, #d4d4d8 1px, transparent 1px);
  background-size: 24px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 40px 20px;
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
}

/* ── Page entrance animation ── */
@keyframes pageIn {
  from { opacity: 0; transform: translateY(16px) scale(0.98); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

/* ── Card ── */
.chat-card {
  width: 100%;
  max-width: 480px;
  background: var(--white);
  border-radius: var(--radius-card);
  border: 1px solid var(--border);
  box-shadow:
    0 0 0 1px rgba(0,0,0,0.03),
    0 4px 8px rgba(0,0,0,0.04),
    0 12px 32px rgba(0,0,0,0.07),
    0 32px 64px rgba(0,0,0,0.04);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  animation: pageIn 0.45s cubic-bezier(0.22, 1, 0.36, 1) both;
}

/* ── Header ── */
.chat-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 18px 24px;
  border-bottom: 1px solid var(--border);
}

.header-icon {
  width: 34px;
  height: 34px;
  background: var(--indigo);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.header-icon svg {
  width: 18px;
  height: 18px;
  color: white;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.header-text h1 {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text-primary);
  line-height: 1.2;
}

.header-text p {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 1px;
}

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

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #22c55e;
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.5; }
}

/* ── Messages area ── */
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-height: 340px;
  max-height: 400px;
  scroll-behavior: smooth;
}

.chat-messages::-webkit-scrollbar { width: 4px; }
.chat-messages::-webkit-scrollbar-track { background: transparent; }
.chat-messages::-webkit-scrollbar-thumb { background: #e4e4e7; border-radius: 4px; }

/* ── Message entrance animation ── */
@keyframes msgIn {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

.message {
  display: flex;
  gap: 8px;
  align-items: flex-end;
  animation: msgIn 0.28s cubic-bezier(0.22, 1, 0.36, 1) both;
  max-width: 88%;
}

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

.message.bot {
  align-self: flex-start;
}

/* ── Avatars ── */
.avatar {
  width: 28px;
  height: 28px;
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-bottom: 2px;
}

.avatar.bot-avatar {
  background: var(--indigo);
}

.avatar.bot-avatar svg {
  width: 14px;
  height: 14px;
  color: white;
  fill: none;
  stroke: currentColor;
  stroke-width: 2.2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.avatar.user-avatar {
  background: #e4e4e7;
}

.avatar.user-avatar svg {
  width: 14px;
  height: 14px;
  color: #71717a;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* ── Bubbles ── */
.bubble {
  padding: 11px 15px;
  font-size: 13.5px;
  line-height: 1.65;
  border-radius: var(--radius-bubble);
  max-width: 100%;
  word-break: break-word;
}

.message.bot .bubble {
  background: var(--bubble-bot);
  color: var(--text-primary);
  border-bottom-left-radius: 6px;
}

.message.user .bubble {
  background: var(--indigo);
  color: white;
  border-bottom-right-radius: 6px;
}

/* ── Typing indicator ── */
.typing-indicator {
  display: none;
  align-self: flex-start;
  gap: 8px;
  align-items: flex-end;
  animation: msgIn 0.28s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.typing-indicator.visible {
  display: flex;
}

.typing-bubble {
  background: var(--bubble-bot);
  border-radius: var(--radius-bubble);
  border-bottom-left-radius: 6px;
  padding: 13px 16px;
  display: flex;
  gap: 5px;
  align-items: center;
}

.typing-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #a1a1aa;
  animation: typingPulse 1.2s ease-in-out infinite;
}

.typing-dot:nth-child(1) { animation-delay: 0s; }
.typing-dot:nth-child(2) { animation-delay: 0.2s; }
.typing-dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes typingPulse {
  0%, 60%, 100% { transform: scale(1);   opacity: 0.4; }
  30%           { transform: scale(1.5); opacity: 1;   }
}

/* ── Input area ── */
.chat-input-area {
  padding: 16px 20px 20px;
  border-top: 1px solid var(--border);
  background: var(--white);
}

.input-row {
  display: flex;
  align-items: center;
  gap: 8px;
  background: #f4f4f5;
  border-radius: 14px;
  padding: 6px 6px 6px 14px;
  transition: box-shadow 0.2s ease, background 0.2s ease;
}

.input-row:focus-within {
  background: var(--white);
  box-shadow: 0 0 0 2px var(--indigo);
}

#user-input {
  flex: 1;
  border: none;
  background: transparent;
  font-family: inherit;
  font-size: 13.5px;
  color: var(--text-primary);
  outline: none;
  resize: none;
  line-height: 1.5;
  max-height: 80px;
  overflow-y: auto;
  padding: 4px 0;
}

#user-input::placeholder { color: #a1a1aa; }

#send-btn {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: var(--indigo);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}

#send-btn:hover {
  background: var(--indigo-hover);
  transform: scale(1.06);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

#send-btn:active { transform: scale(0.97); }

#send-btn svg {
  width: 15px;
  height: 15px;
  color: white;
  fill: none;
  stroke: currentColor;
  stroke-width: 2.2;
  stroke-linecap: round;
  stroke-linejoin: round;
  transform: translateX(1px);
}

/* ── Quick chips ── */
.chips-row {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 28px;
  justify-content: center;
  animation: pageIn 0.5s 0.15s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.chip {
  background: var(--white);
  border: 1px solid #e4e4e7;
  border-radius: 999px;
  padding: 7px 14px;
  font-size: 12.5px;
  font-family: inherit;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.18s ease;
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: 500;
}

.chip svg {
  width: 13px;
  height: 13px;
  flex-shrink: 0;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.chip:hover {
  background: var(--indigo-light);
  border-color: #c7d2fe;
  color: var(--indigo);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.12);
}

.chip:active { transform: translateY(0); }

/* ── Footer tagline ── */
.page-footer {
  margin-top: 18px;
  font-size: 11.5px;
  color: #a1a1aa;
  letter-spacing: 0.01em;
  animation: pageIn 0.5s 0.25s cubic-bezier(0.22, 1, 0.36, 1) both;
}