:root {
  --bg: #f3f4f6;
  --card: #ffffff;
  --accent: #6366f1;
  --accent-hover: #4f46e5;
  --text: #111827;
  --muted: #6b7280;
  --border: #e5e7eb;
  --success: #10b981;
  --error-bg: #fef2f2;
  --error-text: #b91c1c;
  --creator-bg: #e0e7ff;
  --creator-text: #3730a3;
  --bubble-bg: #f3f4f6;
  --bubble-text: #1f2937;
}

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

html, body {
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

.container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 2.5rem;
  max-width: 480px;
  width: 100%;
  box-shadow: 0 4px 24px rgba(0,0,0,0.06);
  text-align: center;
}

h1 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.lock { font-size: 1.25rem; }

.subtitle {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}

.alert {
  background: var(--error-bg);
  color: var(--error-text);
  padding: 0.75rem 1rem;
  border-radius: 10px;
  font-size: 0.875rem;
  margin-bottom: 1rem;
}

.tabs h2 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  text-align: left;
}

.form {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.field {
  text-align: left;
}

.field label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--muted);
  margin-bottom: 0.25rem;
}

.field input,
.field textarea {
  width: 100%;
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 0.95rem;
  font-family: inherit;
  background: #fafafa;
  color: var(--text);
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.field input:focus,
.field textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(99,102,241,0.12);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.65rem 1.25rem;
  border-radius: 10px;
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: all 0.15s ease;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--card);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: var(--bg);
}

.btn-ghost {
  background: transparent;
  color: var(--muted);
  font-size: 0.85rem;
}

.btn-ghost:hover {
  color: var(--text);
}

.btn-send {
  background: var(--accent);
  color: #fff;
  padding: 0.6rem 1rem;
  white-space: nowrap;
}

.btn-send:hover {
  background: var(--accent-hover);
}

.divider {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 1.25rem 0;
  color: var(--muted);
  font-size: 0.8rem;
}

.divider::before,
.divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* Share token page */
.success-icon {
  font-size: 3rem;
  margin-bottom: 0.5rem;
}

.token-box {
  background: #111827;
  color: #e5e7eb;
  padding: 1rem;
  border-radius: 12px;
  margin: 1rem 0 1.5rem;
  word-break: break-all;
}

.token-box code {
  font-family: 'SF Mono', Monaco, monospace;
  font-size: 1.25rem;
  letter-spacing: 0.05em;
}

.actions {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* Chat room */
.chat-container {
  align-items: stretch;
  padding: 1rem;
}

.chat-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  max-width: 640px;
  width: 100%;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  height: calc(100vh - 2rem);
  box-shadow: 0 4px 24px rgba(0,0,0,0.06);
}

.chat-header {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.chat-header h1 {
  font-size: 1.1rem;
  margin: 0;
}

.token-display {
  font-size: 0.8rem;
  color: var(--muted);
}

.token-display code {
  background: #f3f4f6;
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-family: monospace;
  color: var(--text);
}

.messages {
  flex: 1;
  overflow-y: auto;
  padding: 1rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.empty {
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
  padding: 2rem 0;
}

.message {
  max-width: 80%;
}

.message.creator {
  align-self: flex-end;
}

.meta {
  display: flex;
  gap: 0.5rem;
  align-items: baseline;
  margin-bottom: 0.2rem;
}

.sender {
  font-weight: 600;
  font-size: 0.8rem;
  color: var(--text);
}

.time {
  font-size: 0.7rem;
  color: var(--muted);
}

.bubble {
  background: var(--bubble-bg);
  color: var(--bubble-text);
  padding: 0.6rem 0.9rem;
  border-radius: 12px;
  border-bottom-left-radius: 4px;
  font-size: 0.92rem;
  word-break: break-word;
}

.message.creator .bubble {
  background: var(--creator-bg);
  color: var(--creator-text);
  border-bottom-left-radius: 12px;
  border-bottom-right-radius: 4px;
}

.composer {
  padding: 0.75rem 1.25rem;
  border-top: 1px solid var(--border);
}

.composer-row {
  display: flex;
  gap: 0.5rem;
}

.name-input {
  width: 100px;
  flex-shrink: 0;
}

.message-input {
  flex: 1;
}

.composer input {
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 0.92rem;
  outline: none;
}

.composer input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(99,102,241,0.12);
}

.footer-actions {
  padding: 0.5rem 1.25rem 1rem;
}

@media (max-width: 480px) {
  .card { padding: 1.5rem; }
  .chat-header { padding: 0.75rem 1rem; }
  .messages { padding: 0.75rem 1rem; }
  .composer { padding: 0.6rem 1rem; }
  .name-input { width: 80px; }
}