:root {
  --bg: #F5F3EE;
  --surface: #FFFFFF;
  --surface-soft: #ECE9E1;
  --border: #E1DDD1;
  --text: #30291F;
  --text-soft: #7A7367;
  --accent: #C15F3C;
  --accent-hover: #A94F30;
  --accent-soft: #F0DAC9;
  --user-bubble: #E8E4D9;
  --font-serif: 'Fraunces', Georgia, serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #26241E;
    --surface: #302D26;
    --surface-soft: #3A362D;
    --border: #46412F;
    --text: #F1EDE2;
    --text-soft: #A39C8B;
    --accent: #E2825F;
    --accent-hover: #EF9772;
    --accent-soft: #4A3728;
    --user-bubble: #3A362D;
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #26241E;
  --surface: #302D26;
  --surface-soft: #3A362D;
  --border: #46412F;
  --text: #F1EDE2;
  --text-soft: #A39C8B;
  --accent: #E2825F;
  --accent-hover: #EF9772;
  --accent-soft: #4A3728;
  --user-bubble: #3A362D;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
}

.stage {
  height: 100dvh;
  display: flex;
  flex-direction: column;
  padding: 16px;
  position: relative;
}

/* ---------- conversation thread ---------- */

.thread {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  scrollbar-width: none; 
  -ms-overflow-style: none; 
  scroll-behavior: smooth;
  width: 100%;
  max-width: 680px;
  margin: 0 auto;
  padding: 24px 4px 200px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.thread::-webkit-scrollbar {
  display: none;
}

.msg {
  max-width: 90%;
  scroll-margin-bottom: 190px;
  animation: msg-rise 0.35s ease both;
}

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

.msg.user {
  align-self: flex-end;
  background: var(--user-bubble);
  border-radius: 16px 16px 4px 16px;
  padding: 10px 16px;
  font-size: 15px;
}

.msg.assistant:last-child {
  margin-bottom: 100px;
}

.msg.assistant {
  align-self: flex-start;
  padding: 4px 2px;
  font-size: 15px;
  line-height: 1.65;
}

.msg.assistant .avatar-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.msg.assistant .avatar {
  width: 22px;
  height: 22px;
  background-image: url("favicon.png");
  background-size: cover;
  background-position: center;
  flex-shrink: 0;
}

.msg.assistant .model-name {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-soft);
}

.typing {
  display: flex;
  gap: 4px;
  padding: 6px 2px;
}
.typing span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--text-soft);
  animation: bounce 1.2s infinite ease-in-out;
}
.typing span:nth-child(2) { animation-delay: 0.15s; }
.typing span:nth-child(3) { animation-delay: 0.3s; }

@keyframes bounce {
  0%, 80%, 100% { transform: translateY(0); opacity: 0.4; }
  40% { transform: translateY(-4px); opacity: 1; }
}

.footnote {
  cursor: pointer;
  border-bottom: 1px solid var(--border);
  font-weight: 500;
}
.footnote sup {
  color: var(--accent);
  font-size: 11px;
  margin-left: 1px;
}

.ref-grid {
  margin-top: 14px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 10px;
}

.ref-card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  text-decoration: none;
  color: var(--text);
  transition: background 0.15s;
}
.ref-card:hover {
  background: var(--surface-soft);
}
.ref-card .ref-host {
  font-size: 11px;
  color: var(--text-soft);
  margin-bottom: 4px;
}
.ref-card .ref-title {
  font-family: var(--font-serif);
  font-size: 14px;
  margin-bottom: 2px;
}
.ref-card .ref-desc {
  font-size: 12px;
  color: var(--text-soft);
}

.contrib-wrap {
  margin-top: 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  background: var(--surface);
  overflow-x: auto;
}
.contrib-loading {
  font-size: 12px;
  color: var(--text-soft);
}

.contrib-grid {
  display: flex;
  gap: 3px;
  min-width: 480px;
}
.contrib-col {
  display: flex;
  flex-direction: column;
  gap: 3px;
}
.contrib-cell {
  width: 10px;
  height: 10px;
  border-radius: 2px;
  background: var(--surface-soft);
}
.contrib-cell[data-level="1"] { background: var(--accent-soft); }
.contrib-cell[data-level="2"] { background: color-mix(in srgb, var(--accent) 45%, var(--surface-soft)); }
.contrib-cell[data-level="3"] { background: color-mix(in srgb, var(--accent) 75%, var(--surface-soft)); }
.contrib-cell[data-level="4"] { background: var(--accent); }

.contrib-caption {
  font-size: 12px;
  color: var(--text-soft);
  margin-top: 8px;
}

.photo-card {
  position: relative;
  aspect-ratio: 1;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--surface-soft);
}
.photo-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.photo-card .photo-fallback {
  display: none;
  position: absolute;
  inset: 0;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 10px;
  font-size: 11px;
  color: var(--text-soft);
}
.photo-card.photo-missing img {
  display: none;
}
.photo-card.photo-missing .photo-fallback {
  display: flex;
}
.photo-card .photo-caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 16px 8px 6px;
  font-size: 11px;
  color: #FAF9F5;
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.55));
}
.photo-card.photo-missing .photo-caption {
  display: none;
}

.msg.assistant a {
  color: var(--accent);
}

/* ---------- prompt box ---------- */

.prompt-wrap {
  width: 100%;
  max-width: 680px;
  margin: 0 auto;
  position: absolute;
  left: 50%;
  bottom: 50%;
  transform: translate(-50%, 50%);
  transition: bottom 0.5s cubic-bezier(0.22, 1, 0.36, 1), transform 0.5s cubic-bezier(0.22, 1, 0.36, 1);
  opacity: 0;
  animation: rise 0.6s ease 0.15s forwards;
}

.prompt-wrap.docked {
  position: fixed;
  bottom: 0;
  transform: translate(-50%, 0);
  padding-bottom: 16px;
  opacity: 1;
  animation: none;
}

@keyframes rise {
  from { opacity: 0; transform: translate(-50%, 65%); }
  to { opacity: 1; transform: translate(-50%, 50%); }
}

.prompt-box {
  border-radius: 16px;
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: 0 10px 30px rgba(48, 41, 31, 0.08);
  overflow: hidden;
}

.chip-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 18px 0;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}
.chip-row::-webkit-scrollbar {
  display: none;
}

.at-icon {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: var(--surface-soft);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-soft);
  flex-shrink: 0;
}
.at-icon svg { width: 14px; height: 14px; }

.file-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 28px;
  border-radius: 8px;
  background: var(--surface-soft);
  border: 1px solid var(--border);
  padding: 0 10px;
  font-size: 13px;
  font-family: var(--font-mono);
  flex-shrink: 0;
  white-space: nowrap;
}

.file-chip .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #4CA771;
}

.file-chip .dot.orange {
  background: orange;
}

.file-chip .x-icon {
  width: 12px;
  height: 12px;
  color: var(--text-soft);
  opacity: 0.5;
}

textarea#promptInput {
  width: 100%;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 10px;
  margin: 14px 18px 0;
  width: calc(100% - 36px);
  padding: 10px 14px;
  font-size: 16px;
  font-family: var(--font-mono);
  color: var(--text);
  line-height: 1.6;
  resize: none;
}
textarea#promptInput:focus {
  outline: none;
  border-color: var(--accent);
}

.controls-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border);
  padding: 12px 18px;
  margin-top: 14px;
}

.left-controls, .right-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 32px;
  border-radius: 10px;
  background: var(--surface-soft);
  border: 1px solid var(--border);
  padding: 0 12px;
  font-size: 13px;
  color: var(--text);
  font-family: var(--font-sans);
  cursor: not-allowed;
}
.pill.ghost {
  background: transparent;
  color: var(--text-soft);
}
.pill-icon { width: 15px; height: 15px; color: var(--text-soft); }
.chevron { width: 14px; height: 14px; opacity: 0.6; }

.icon-btn {
  width: 32px;
  height: 32px;
  border-radius: 10px;
  background: var(--surface-soft);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-soft);
  cursor: not-allowed;
}
.icon-btn svg { width: 15px; height: 15px; }

.send-btn {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--accent);
  border: none;
  color: #FAF9F5;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform 0.1s, background 0.15s;
}
.send-btn:hover { background: var(--accent-hover); }
.send-btn:active { transform: scale(0.94); }
.send-btn svg { width: 15px; height: 15px; }

.suggestions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-top: 14px;
}

.suggestion-chip {
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 7px 14px;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}
.suggestion-chip:hover {
  background: var(--surface-soft);
  border-color: var(--accent);
}

.prompt-wrap.docked .suggestions {
  display: none;
}

/* ---------- social nav ---------- */

.social-nav {
  position: fixed;
  bottom: 16px;
  right: 16px;
  display: flex;
  gap: 14px;
}

.social-link {
  color: var(--text-soft);
  opacity: 0;
  animation: fade-in 0.5s ease 0.6s forwards;
  transition: color 0.15s;
}
.social-link:nth-child(2) { animation-delay: 0.7s; }
.social-link:nth-child(3) { animation-delay: 0.8s; }
.social-link:hover { color: var(--accent); }
.social-link svg { width: 20px; height: 20px; }

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

@media (max-width: 640px) {
  .social-nav { display: none; }
  .thread { padding-bottom: 220px; }
}

@media (max-width: 400px) {
  .stage { padding: 12px; }
  .chip-row { padding: 12px 14px 0; }
  textarea#promptInput { margin: 12px 14px 0; width: calc(100% - 28px); }
  .controls-row { flex-wrap: wrap; row-gap: 10px; padding: 12px 14px; }
  .pill.ghost { padding: 0 8px; }
}