/* ==========================================================================
   Chat-Seite – modernes UI im Stil von claude.ai
   Eigenständiges Stylesheet, nur für body.chat-page.
   Nutzt ausschliesslich Klassen-Selektoren, damit die globalen
   Element-Regeln aus css/styles.css (h1, section, .container, ...)
   nicht mit diesem Layout kollidieren.
   ========================================================================== */

body.chat-page {
  --chat-bg: #f7f6f3;
  --chat-surface: #ffffff;
  --chat-border: #e6e4df;
  --chat-text: #262624;
  --chat-text-secondary: #78766f;
  --chat-accent: #cc785c;
  --chat-accent-hover: #b8664c;
  --chat-accent-contrast: #ffffff;
  --chat-user-bubble: #f0eee6;
  --chat-assistant-bubble: #ffffff;
  --chat-shadow: 0 1px 2px rgba(0, 0, 0, 0.04), 0 2px 8px rgba(0, 0, 0, 0.06);
  --chat-radius-lg: 20px;
  --chat-radius-md: 14px;
  --chat-header-height: 56px;

  margin: 0;
  min-height: 100vh;
  background-color: var(--chat-bg);
  color: var(--chat-text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

/* ---------- Topbar / Navigation ---------- */

body.chat-page .chat-topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--chat-header-height);
  background-color: var(--chat-surface);
  border-bottom: 1px solid var(--chat-border);
  z-index: 10;
}

body.chat-page .chat-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.75rem;
  height: 100%;
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1rem;
}

body.chat-page .chat-nav a {
  color: var(--chat-text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.4rem 0.6rem;
  border-radius: 8px;
  transition: background-color 0.15s ease, color 0.15s ease;
}

body.chat-page .chat-nav a:hover {
  background-color: var(--chat-bg);
  color: var(--chat-text);
  text-decoration: none;
}

body.chat-page .chat-nav a.chat-nav-active {
  color: var(--chat-accent);
}

/* ---------- Layout ---------- */

body.chat-page .chat-main {
  padding-top: var(--chat-header-height);
  height: 100vh;
  box-sizing: border-box;
  display: flex;
  justify-content: center;
}

body.chat-page .chat-shell {
  width: 100%;
  max-width: 820px;
  height: calc(100vh - var(--chat-header-height));
  display: flex;
  flex-direction: column;
}

/* ---------- Message list ---------- */

body.chat-page .chat-messages {
  flex: 1 1 auto;
  overflow-y: auto;
  padding: 2rem 1.25rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  scroll-behavior: smooth;
}

body.chat-page .chat-messages::-webkit-scrollbar {
  width: 8px;
}

body.chat-page .chat-messages::-webkit-scrollbar-thumb {
  background-color: #d8d6cf;
  border-radius: 8px;
}

body.chat-page .chat-messages::-webkit-scrollbar-track {
  background: transparent;
}

/* Welcome / empty state */

body.chat-page .chat-welcome {
  margin: auto;
  text-align: center;
  max-width: 480px;
  padding: 2rem 1rem;
}

body.chat-page .chat-title {
  font-size: 1.9rem;
  font-weight: 600;
  margin: 0 0 0.5rem;
  text-shadow: none;
  color: var(--chat-text);
}

body.chat-page .chat-subtitle {
  font-size: 1rem;
  color: var(--chat-text-secondary);
  margin: 0;
}

/* Single message row */

body.chat-page .chat-message {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  max-width: 100%;
  animation: chat-message-in 0.2s ease;
}

@keyframes chat-message-in {
  from {
    opacity: 0;
    transform: translateY(4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

body.chat-page .chat-avatar {
  flex: 0 0 auto;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--chat-accent-contrast);
  background-color: var(--chat-text-secondary);
}

body.chat-page .chat-message-assistant .chat-avatar {
  background-color: var(--chat-accent);
}

body.chat-page .chat-message-user .chat-avatar {
  background-color: #37352f;
}

body.chat-page .chat-bubble {
  border-radius: var(--chat-radius-md);
  padding: 0.7rem 1rem;
  line-height: 1.5;
  font-size: 0.95rem;
  white-space: pre-wrap;
  word-break: break-word;
}

body.chat-page .chat-message-assistant .chat-bubble {
  background-color: var(--chat-assistant-bubble);
  border: 1px solid var(--chat-border);
  box-shadow: var(--chat-shadow);
}

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

body.chat-page .chat-message-user .chat-bubble {
  background-color: var(--chat-user-bubble);
}

body.chat-page .chat-message-error .chat-bubble {
  background-color: #fdf1ef;
  border: 1px solid #f2c4bb;
  color: #a6402f;
}

/* Typing indicator */

body.chat-page .chat-typing {
  display: inline-flex;
  gap: 4px;
  padding: 0.4rem 0.2rem;
}

body.chat-page .chat-typing span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--chat-text-secondary);
  opacity: 0.6;
  animation: chat-typing-bounce 1.1s infinite ease-in-out;
}

body.chat-page .chat-typing span:nth-child(2) {
  animation-delay: 0.15s;
}

body.chat-page .chat-typing span:nth-child(3) {
  animation-delay: 0.3s;
}

@keyframes chat-typing-bounce {
  0%, 60%, 100% {
    transform: translateY(0);
    opacity: 0.5;
  }
  30% {
    transform: translateY(-4px);
    opacity: 1;
  }
}

/* ---------- Input area ---------- */

body.chat-page .chat-input-area {
  flex: 0 0 auto;
  padding: 0.75rem 1.25rem 1.25rem;
}

body.chat-page .chat-input-wrapper {
  display: flex;
  align-items: flex-end;
  gap: 0.5rem;
  background-color: var(--chat-surface);
  border: 1px solid var(--chat-border);
  border-radius: var(--chat-radius-lg);
  box-shadow: var(--chat-shadow);
  padding: 0.6rem 0.6rem 0.6rem 1rem;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

body.chat-page .chat-input-wrapper:focus-within {
  border-color: var(--chat-accent);
  box-shadow: 0 0 0 3px rgba(204, 120, 92, 0.15);
}

body.chat-page .chat-textarea {
  flex: 1 1 auto;
  resize: none;
  border: none;
  outline: none;
  background: transparent;
  font-family: inherit;
  font-size: 0.95rem;
  line-height: 1.5;
  color: var(--chat-text);
  max-height: 200px;
  padding: 0.35rem 0;
}

body.chat-page .chat-textarea::placeholder {
  color: var(--chat-text-secondary);
}

body.chat-page .chat-send-btn {
  flex: 0 0 auto;
  width: 34px;
  height: 34px;
  border: none;
  border-radius: 50%;
  background-color: var(--chat-accent);
  color: var(--chat-accent-contrast);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background-color 0.15s ease, transform 0.1s ease;
}

body.chat-page .chat-send-btn:hover:not(:disabled) {
  background-color: var(--chat-accent-hover);
}

body.chat-page .chat-send-btn:active:not(:disabled) {
  transform: scale(0.94);
}

body.chat-page .chat-send-btn:disabled {
  background-color: var(--chat-border);
  color: var(--chat-text-secondary);
  cursor: not-allowed;
}

body.chat-page .chat-send-btn svg {
  width: 16px;
  height: 16px;
}

body.chat-page .chat-hint {
  text-align: center;
  font-size: 0.75rem;
  color: var(--chat-text-secondary);
  margin: 0.5rem 0 0;
}

/* ---------- Responsive ---------- */

@media (max-width: 640px) {
  body.chat-page .chat-nav {
    gap: 1rem;
    justify-content: flex-start;
    overflow-x: auto;
  }

  body.chat-page .chat-messages {
    padding: 1.25rem 0.85rem 0.5rem;
  }

  body.chat-page .chat-input-area {
    padding: 0.5rem 0.75rem 0.85rem;
  }

  body.chat-page .chat-title {
    font-size: 1.5rem;
  }

  body.chat-page .chat-bubble {
    font-size: 0.9rem;
  }
}