:root {
  color-scheme: light;
  --bg: #ffffff;
  --surface: rgba(255, 255, 255, 0.9);
  --surface-strong: #ffffff;
  --text: #111111;
  --muted: #6f6f77;
  --line: rgba(17, 17, 17, 0.08);
  --shadow-soft: 0 24px 60px rgba(17, 17, 17, 0.08);
  --shadow-card: 0 16px 36px rgba(17, 17, 17, 0.07);
  --radius-xl: 32px;
  --radius-lg: 24px;
  --radius-md: 18px;
  --user: #111111;
  --user-text: #ffffff;
  --assistant: #f6f6f7;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(180deg, rgba(17, 17, 17, 0.03), transparent 22%),
    radial-gradient(circle at top, rgba(17, 17, 17, 0.025), transparent 45%);
}

.site-header {
  position: fixed;
  top: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--muted);
  text-transform: uppercase;
}

.app-shell {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: min(100%, 920px);
  min-height: 100vh;
  margin: 0 auto;
  padding: 5rem 1.25rem 1.5rem;
  gap: 2rem;
}

.luna-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.luna-image {
  position: relative;
  width: min(180px, 34vw);
  height: auto;
  object-fit: contain;
  filter: drop-shadow(0 20px 28px rgba(17, 17, 17, 0.12));
  animation: float 5.8s ease-in-out infinite;
  user-select: none;
  -webkit-user-drag: none;
}

.luna-name {
  margin: 0;
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.05;
  letter-spacing: 0.15em;
  color: var(--muted);
}

.chat-area {
  width: 100%;
  max-width: min(900px, 90vw);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.messages {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  min-height: 0;
  max-height: 50vh;
  padding: 1rem 0.15rem 0.35rem;
  overflow-y: auto;
  scroll-behavior: smooth;
}

.messages::-webkit-scrollbar {
  width: 9px;
}

.messages::-webkit-scrollbar-thumb {
  background: rgba(17, 17, 17, 0.12);
  border: 2px solid transparent;
  border-radius: 999px;
  background-clip: padding-box;
}

.message-row {
  display: flex;
  opacity: 0;
  transform: translateY(12px);
  animation: rise 420ms cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

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

.message-row.assistant {
  justify-content: flex-start;
}

.message-bubble {
  position: relative;
  max-width: min(85%, 52rem);
  padding: 1rem 1.15rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  word-break: break-word;
  line-height: 1.55;
}

.message-row.assistant .message-bubble {
  background: var(--assistant);
  color: var(--text);
  border-top-left-radius: 0.75rem;
}

.message-row.user .message-bubble {
  background: var(--user);
  color: var(--user-text);
  border-top-right-radius: 0.75rem;
  white-space: pre-wrap;
}

.message-row.assistant .message-bubble > :first-child {
  margin-top: 0;
}

.message-row.assistant .message-bubble > :last-child {
  margin-bottom: 0;
}

.message-row.assistant .message-bubble p,
.message-row.assistant .message-bubble ul,
.message-row.assistant .message-bubble ol,
.message-row.assistant .message-bubble pre,
.message-row.assistant .message-bubble blockquote {
  margin: 0.75rem 0;
}

.message-row.assistant .message-bubble ul,
.message-row.assistant .message-bubble ol {
  padding-left: 1.3rem;
}

.message-row.assistant .message-bubble li + li {
  margin-top: 0.25rem;
}

.message-row.assistant .message-bubble code {
  font-family: "SFMono-Regular", "SF Mono", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.92em;
}

.message-row.assistant .message-bubble :not(pre) > code {
  padding: 0.16rem 0.34rem;
  border-radius: 0.45rem;
  background: rgba(17, 17, 17, 0.08);
}

.message-row.assistant .message-bubble pre {
  overflow-x: auto;
  padding: 0.85rem 0.95rem;
  border-radius: 1rem;
  background: rgba(17, 17, 17, 0.08);
}

.message-row.assistant .message-bubble pre code {
  display: block;
  white-space: pre;
}

.message-row.assistant .message-bubble strong {
  font-weight: 600;
}

.message-row.assistant .message-bubble a {
  color: inherit;
}

.message-bubble.streaming::after {
  content: "";
  display: inline-block;
  width: 0.65rem;
  height: 1.05rem;
  margin-left: 0.18rem;
  vertical-align: -0.14rem;
  border-radius: 999px;
  background: currentColor;
  opacity: 0.45;
  animation: blink 0.9s ease-in-out infinite;
}

.composer {
  position: sticky;
  bottom: 1rem;
  display: grid;
  gap: 0.9rem;
  padding: 1rem;
  background: rgba(255, 255, 255, 0.88);
  border: 1px solid rgba(17, 17, 17, 0.07);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(14px);
}

.composer::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(180deg, rgba(17, 17, 17, 0.08), rgba(17, 17, 17, 0.02));
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

textarea {
  width: 100%;
  min-height: 3.5rem;
  max-height: 13rem;
  resize: none;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--text);
  font: inherit;
  line-height: 1.55;
}

textarea::placeholder {
  color: #96969c;
}

.composer-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.composer-buttons {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.composer-hint {
  margin: 0;
  font-size: 0.84rem;
  color: var(--muted);
}

button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 5.5rem;
  padding: 0.8rem 1.1rem;
  border: 0;
  border-radius: 999px;
  background: #111111;
  color: #ffffff;
  font: inherit;
  font-weight: 600;
  box-shadow: 0 16px 28px rgba(17, 17, 17, 0.14);
  cursor: pointer;
  transition:
    transform 180ms ease,
    box-shadow 180ms ease,
    opacity 180ms ease;
}

button:hover {
  transform: translateY(-1px);
  box-shadow: 0 18px 30px rgba(17, 17, 17, 0.18);
}

button:active {
  transform: translateY(0);
}

button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  box-shadow: none;
}

.btn-secondary {
  background: transparent;
  color: #96969c;
  box-shadow: none;
  min-width: auto;
  padding: 0.8rem 0.9rem;
  font-weight: 500;
}

.btn-secondary:hover {
  background: rgba(17, 17, 17, 0.04);
  color: #6f6f77;
  box-shadow: none;
}

.btn-secondary:active {
  background: rgba(17, 17, 17, 0.08);
}

.prompt-suggestions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  padding: 0 0.5rem;
}

.suggestion-chip {
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 0.9rem;
  border: 1px solid rgba(17, 17, 17, 0.1);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.7);
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 500;
  min-width: auto;
  box-shadow: none;
  transition:
    background 180ms ease,
    color 180ms ease,
    border-color 180ms ease;
}

.suggestion-chip:hover {
  background: rgba(17, 17, 17, 0.04);
  color: var(--text);
  border-color: rgba(17, 17, 17, 0.15);
  transform: none;
  box-shadow: none;
}

.suggestion-chip:active {
  background: rgba(17, 17, 17, 0.08);
}

@media (max-width: 720px) {
  .prompt-suggestions {
    gap: 0.4rem;
  }

  .suggestion-chip {
    padding: 0.4rem 0.7rem;
    font-size: 0.8rem;
  }
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-10px);
  }
}

@keyframes rise {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes blink {
  0%,
  100% {
    opacity: 0.18;
  }
  50% {
    opacity: 0.68;
  }
}

@media (max-width: 720px) {
  .app-shell {
    padding: 2rem 1rem 1rem;
  }

  .luna-image {
    width: min(160px, 40vw);
  }

  .luna-name {
    font-size: clamp(1.5rem, 5vw, 2rem);
  }

  .message-bubble {
    max-width: 92%;
    padding: 0.95rem 1rem;
  }

  .composer {
    gap: 0.75rem;
    padding: 0.9rem;
    border-radius: 1.4rem;
  }

  .composer-actions {
    align-items: flex-end;
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 1ms !important;
    scroll-behavior: auto !important;
  }
}