/* ========================================
   Chat — Design System
   ======================================== */

/* Inherit theme variables from styles.css */
@import url('styles.css');

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Helvetica Neue', Helvetica, Roboto, sans-serif;
  background: var(--bg-body);
  color: var(--text-primary);
  height: 100dvh;
  overflow: hidden;
  transition: background var(--duration-base) var(--ease-smooth);
}

.chat-container {
  display: flex;
  flex-direction: column;
  height: 100dvh;
  max-width: 600px;
  margin: 0 auto;
  background: var(--bg-body);
}

/* ---- Header ---- */
.chat-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  flex-shrink: 0;
  backdrop-filter: blur(20px);
}

.header-back {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  color: var(--accent-primary);
  cursor: pointer;
  transition: background var(--duration-fast) var(--ease-smooth);
}

.header-back:hover { background: var(--accent-primary-15); }

.header-back svg {
  width: 20px;
  height: 20px;
}

.header-avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.header-avatar svg {
  width: 20px;
  height: 20px;
  color: #fff;
}

.header-info { flex: 1; }

.header-name {
  font-weight: 600;
  font-size: var(--text-md);
  color: var(--text-primary);
}

.header-status {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  transition: color var(--duration-fast) var(--ease-smooth);
}

.header-status.typing {
  color: var(--accent-primary);
  font-weight: 500;
}

/* ---- Messages ---- */
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-4) var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  scroll-behavior: smooth;
  -webkit-overflow-scrolling: touch;
}

/* Welcome */
.welcome-message {
  display: flex;
  justify-content: center;
  margin-bottom: var(--space-4);
}

.welcome-bubble {
  background: linear-gradient(135deg, var(--accent-primary-15) 0%, rgba(139, 92, 246, 0.08) 100%);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--text-secondary);
  max-width: 90%;
  text-align: center;
}

/* Bubbles */
.message {
  display: flex;
  max-width: 85%;
  animation: msgAppear var(--duration-slow) var(--ease-smooth) both;
  will-change: transform, opacity;
}

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

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

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

.message-bubble {
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg);
  font-size: var(--text-base);
  line-height: 1.5;
  word-wrap: break-word;
  white-space: pre-wrap;
}

.message.user .message-bubble {
  background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
  color: #fff;
  border-bottom-right-radius: var(--space-1);
}

.message.assistant .message-bubble {
  background: var(--bg-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
  border-bottom-left-radius: var(--space-1);
}

.message-time {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  margin-top: var(--space-1);
  text-align: right;
}

/* ---- Typing Indicator ---- */
.typing-indicator {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  margin-left: var(--space-2);
  animation: msgAppear var(--duration-slow) var(--ease-smooth) both;
}

.typing-dots {
  display: flex;
  gap: var(--space-1);
}

.typing-dots span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-primary);
  animation: typingBounce 1.4s infinite ease-in-out both;
}

.typing-dots span:nth-child(1) { animation-delay: -0.32s; }
.typing-dots span:nth-child(2) { animation-delay: -0.16s; }

@keyframes typingBounce {
  0%, 80%, 100% { transform: scale(0.6); opacity: 0.4; }
  40% { transform: scale(1); opacity: 1; }
}

.typing-text {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
}

/* ---- Input ---- */
.chat-input-area {
  padding: var(--space-3) var(--space-4);
  background: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  flex-shrink: 0;
}

.input-wrapper {
  display: flex;
  gap: var(--space-2);
  align-items: center;
}

#chat-input {
  flex: 1;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  font-size: var(--text-base);
  font-family: inherit;
  background: var(--bg-elevated);
  color: var(--text-primary);
  outline: none;
  transition: border-color var(--duration-fast) var(--ease-smooth);
}

#chat-input:focus {
  border-color: var(--accent-primary);
}

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

.send-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: none;
  background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
  transition: transform var(--duration-fast) var(--ease-smooth), box-shadow var(--duration-fast) var(--ease-smooth);
}

.send-btn:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-md);
}

.send-btn:active {
  transform: scale(0.95);
}

.send-btn svg {
  width: 18px;
  height: 18px;
}

/* Scrollbar */
.chat-messages::-webkit-scrollbar { width: 3px; }
.chat-messages::-webkit-scrollbar-track { background: transparent; }
.chat-messages::-webkit-scrollbar-thumb { background: var(--border-subtle); border-radius: 2px; }

/* Safe area */
@supports (padding-bottom: env(safe-area-inset-bottom)) {
  .chat-input-area {
    padding-bottom: max(var(--space-3), env(safe-area-inset-bottom));
  }
}