/* ─── Chat shell ─────────────────────────────────────────────────────── */
.chat-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
}

/* ─── Header ─────────────────────────────────────────────────────────── */
.chat-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  border-bottom: 1px solid var(--border);
  background: rgba(12, 10, 9, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 18px 0;
}

.chat-header-inner {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 14px;
}

.char-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--surface);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  flex-shrink: 0;
}

.char-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
}

.char-name {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.01em;
}

.char-status {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-3);
}

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--text-3);
  flex-shrink: 0;
}

.char-model-badge {
  margin-left: auto;
}

.model-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-3);
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 4px 10px;
  border-radius: 4px;
  letter-spacing: 0.03em;
}

/* ─── Thread ────────────────────────────────────────────────────────── */
.chat-thread {
  flex: 1;
  padding-top: 80px;
  padding-bottom: 120px;
  overflow-y: auto;
}

.thread-inner {
  max-width: 720px;
  margin: 0 auto;
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.message {
  display: flex;
  gap: 12px;
  animation: msg-in 0.25s ease-out both;
}

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

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

.msg-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--surface);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-3);
  flex-shrink: 0;
  margin-top: 2px;
}

.msg-body {
  max-width: 72%;
}

.msg-text {
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 12px 16px;
  border-radius: 12px;
  border-top-left-radius: 4px;
}

.message-user .msg-text {
  background: var(--surface-2);
  border-top-left-radius: 12px;
  border-top-right-radius: 4px;
}

/* ─── Inline upgrade teaser — injected into thread ─────────────────── */
.upgrade-teaser {
  animation: ut-rise 0.45s cubic-bezier(0.16, 1, 0.3, 1) both;
}

@keyframes ut-rise {
  from { opacity: 0; transform: translateY(14px) scale(0.98); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

.ut-inner {
  background: var(--surface);
  border: 1px solid rgba(212, 165, 67, 0.18);
  border-radius: 16px;
  padding: 16px 18px 18px;
  position: relative;
  overflow: hidden;
}

.ut-inner::before {
  content: '';
  position: absolute;
  top: 0; left: 8%; right: 8%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(212, 165, 67, 0.35), transparent);
}

.ut-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.ut-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: var(--font-mono);
  font-size: 0.58rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #d4a543;
  background: rgba(212, 165, 67, 0.1);
  border: 1px solid rgba(212, 165, 67, 0.2);
  padding: 3px 9px;
  border-radius: 20px;
}

.ut-close {
  background: none;
  border: none;
  color: var(--text-3);
  cursor: pointer;
  padding: 3px;
  border-radius: 4px;
  line-height: 0;
  opacity: 0.5;
  transition: color 0.15s, opacity 0.15s;
}

.ut-close:hover {
  color: var(--text-2);
  opacity: 1;
}

.ut-headline {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.02em;
  margin-bottom: 3px;
}

.ut-sub {
  font-size: 0.74rem;
  color: var(--text-3);
  line-height: 1.5;
  margin-bottom: 14px;
}

/* Comparison */
.ut-comparison {
  display: grid;
  grid-template-columns: 80px 1fr 1fr;
  gap: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: 14px;
  background: var(--bg-2);
}

.ut-row {
  display: contents;
}

.ut-row--head .ut-col-label {
  font-family: var(--font-mono);
  font-size: 0.5rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-3);
  padding: 6px 8px;
  border-bottom: 1px solid rgba(212, 165, 67, 0.2);
  background: var(--surface);
}

.ut-col-label--pro { color: #d4a543; }

.ut-cell,
.ut-cap {
  padding: 6px 8px;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  line-height: 1.4;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}

.ut-cell:last-child,
.ut-cap:last-child {
  border-bottom: none;
}

.ut-cap {
  color: var(--text-3);
  opacity: 0.6;
  letter-spacing: 0.04em;
}

.ut-cell {
  color: var(--text-3);
}

.ut-cell--pro {
  color: var(--text-2);
}

.ut-row--head .ut-cell {
  border-bottom: 1px solid rgba(212, 165, 67, 0.2);
}

/* Live quality preview */
.ut-preview-label {
  font-family: var(--font-mono);
  font-size: 0.52rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-3);
  opacity: 0.55;
  margin-bottom: 7px;
}

.ut-preview-block {
  border-radius: 8px;
  padding: 9px 12px;
  margin-bottom: 3px;
}

.ut-preview-block--free {
  background: var(--bg-2);
  border: 1px solid var(--border);
}

.ut-preview-block--pro {
  background: rgba(212, 165, 67, 0.07);
  border: 1px solid rgba(212, 165, 67, 0.18);
  box-shadow: 0 0 16px rgba(212, 165, 67, 0.05);
}

.ut-preview-tag {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.5rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 3px;
}

.ut-preview-tag--pro { color: #d4a543; }

.ut-preview-block p {
  font-size: 0.72rem;
  line-height: 1.5;
  color: var(--text-3);
  font-style: italic;
}

.ut-preview-block--pro p {
  color: var(--text-2);
}

.ut-sep {
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.58rem;
  color: var(--text-3);
  opacity: 0.35;
  letter-spacing: 0.1em;
  padding: 1px 0 3px;
}

/* CTA */
.ut-cta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 14px;
}

.ut-upgrade-btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 11px 18px;
  background: linear-gradient(135deg, #d4a543 0%, #c4932a 100%);
  color: #0c0a09;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
  border-radius: 8px;
  flex: 1;
  justify-content: center;
  transition: background 0.2s, transform 0.12s, box-shadow 0.2s;
  box-shadow: 0 2px 16px rgba(212, 165, 67, 0.28), 0 0 0 1px rgba(212,165,67,0.08);
  position: relative;
  overflow: hidden;
}

.ut-upgrade-btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.14) 0%, transparent 60%);
  pointer-events: none;
}

.ut-upgrade-btn:hover {
  background: linear-gradient(135deg, #e0b54a 0%, #d4a543 100%);
  transform: translateY(-1px);
  box-shadow: 0 6px 22px rgba(212, 165, 67, 0.38), 0 0 0 1px rgba(212,165,67,0.18);
}

.ut-upgrade-btn:active {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(212, 165, 67, 0.2);
}

.ut-dismiss {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-3);
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.04em;
  padding: 9px 14px;
  border-radius: 7px;
  cursor: pointer;
  white-space: nowrap;
  transition: color 0.15s, border-color 0.15s;
}

.ut-dismiss:hover {
  color: var(--text-2);
  border-color: rgba(255, 255, 255, 0.1);
}

/* ─── Input bar ────────────────────────────────────────────────────── */
.chat-input-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  border-top: 1px solid var(--border);
  background: rgba(12, 10, 9, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 14px 0;
  z-index: 50;
}

.input-bar-inner {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.input-wrapper {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 2px 6px 2px 14px;
  transition: border-color 0.15s;
}

.input-wrapper:focus-within {
  border-color: rgba(212, 165, 67, 0.4);
}

.chat-input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 300;
  color: var(--text);
  padding: 10px 0;
}

.chat-input::placeholder {
  color: var(--text-3);
}

.input-send {
  width: 34px;
  height: 34px;
  border-radius: 7px;
  background: var(--accent);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #0c0a09;
  transition: background 0.15s, transform 0.1s;
  flex-shrink: 0;
}

.input-send:hover {
  background: #e0b04e;
  transform: scale(1.05);
}

.input-send:active {
  transform: scale(0.97);
}

.input-hint {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-3);
  padding-left: 2px;
}

/* ─── Responsive ───────────────────────────────────────────────────── */
@media (max-width: 640px) {
  .thread-inner { padding: 24px 16px 20px; }
  .msg-body { max-width: 88%; }
  .chat-header-inner { padding: 0 16px; }
  .input-bar-inner { padding: 0 16px; }
  .ut-cta { flex-direction: column; }
  .ut-dismiss { width: 100%; text-align: center; }
  .ut-row { grid-template-columns: 72px 1fr 1fr; }
  .ut-col-label--free, .ut-col-label--pro { font-size: 0.48rem; }
  .ut-cell { font-size: 0.65rem; }
  .ut-cap { font-size: 0.55rem; }
}