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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  transition: background-color 0.2s, color 0.2s;
  min-height: 100vh;
  overflow-x: hidden;
}

::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--scrollbar-thumb); border-radius: 4px; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

button {
  border: none;
  cursor: pointer;
  font-family: inherit;
  font-size: inherit;
  background: none;
}

input, textarea {
  font-family: inherit;
  font-size: inherit;
  outline: none;
}

img { max-width: 100%; display: block; }

ul, ol { list-style: none; }

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

.truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: 9999px;
  font-weight: 700;
  font-size: 15px;
  transition: all 0.2s;
  white-space: nowrap;
}

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

.btn-outline {
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  background: transparent;
}
.btn-outline:hover { background: var(--bg-hover); }

.btn-danger {
  background: var(--danger);
  color: #ffffff;
}
.btn-danger:hover { background: var(--danger-hover); }

.btn-ghost {
  color: var(--text-primary);
  padding: 8px;
  border-radius: 50%;
}
.btn-ghost:hover { background: var(--bg-hover); }

.btn-sm { padding: 4px 12px; font-size: 13px; }
.btn-lg { padding: 12px 24px; font-size: 17px; }

/* Input */
.input {
  width: 100%;
  padding: 12px 16px;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: 4px;
  color: var(--text-primary);
  font-size: 16px;
  transition: border-color 0.2s, background 0.2s;
}
.input:focus {
  border-color: var(--accent);
  background: var(--input-bg-focus);
}
.input::placeholder { color: var(--text-tertiary); }

.input-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.input-label {
  font-size: 14px;
  color: var(--text-secondary);
  font-weight: 500;
}

.input-error {
  font-size: 13px;
  color: var(--danger);
}

/* Avatar */
.avatar {
  border-radius: 50%;
  object-fit: cover;
  background: var(--bg-tertiary);
  flex-shrink: 0;
}
.avatar-sm { width: 32px; height: 32px; }
.avatar-md { width: 40px; height: 40px; }
.avatar-lg { width: 48px; height: 48px; }
.avatar-xl { width: 80px; height: 80px; }
.avatar-2xl { width: 134px; height: 134px; }

.avatar-fallback {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent);
  color: #ffffff;
  font-weight: 700;
  border-radius: 50%;
}

/* Loader / Spinner */
.loader {
  display: none;
}

.spinner {
  display: none;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Skeleton */
.skeleton {
  background: var(--skeleton);
  border-radius: 4px;
  animation: skeleton-pulse 1.5s ease-in-out infinite;
}

@keyframes skeleton-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* Error / Empty */
.error-message {
  text-align: center;
  padding: 32px;
  color: var(--danger);
}

.empty-state {
  text-align: center;
  padding: 48px 32px;
  color: var(--text-secondary);
}

/* Divider */
.divider {
  height: 1px;
  background: var(--border-color);
  margin: 0;
}

/* Badge */
.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  border-radius: 9999px;
  background: var(--accent);
  color: #ffffff;
  font-size: 11px;
  font-weight: 700;
}

/* Tab */
.tabs {
  display: flex;
  border-bottom: 1px solid var(--border-color);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  position: relative;
  mask-image: linear-gradient(to right, black 85%, transparent 100%);
  -webkit-mask-image: linear-gradient(to right, black 85%, transparent 100%);
}
.tabs::-webkit-scrollbar {
  display: none;
}

.tab {
  flex: 1;
  min-width: max-content;
  padding: 14px 12px;
  text-align: center;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all 0.2s;
  position: relative;
  white-space: nowrap;
  font-size: 14px;
}
.tab:hover { background: var(--bg-hover); }
.tab.active {
  color: var(--text-primary);
  font-weight: 700;
}
.tab.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 56px;
  height: 4px;
  background: var(--accent);
  border-radius: 2px;
}

/* Character counter */
.char-counter {
  font-size: 13px;
  color: var(--text-secondary);
}
.char-counter.warn { color: #ffd400; }
.char-counter.danger { color: var(--danger); }

/* Emoji picker - always visible */
.emoji-picker-popup {
  position: fixed !important;
  bottom: 80px !important;
  left: 16px !important;
  right: 16px !important;
  max-width: 420px !important;
  margin: 0 auto !important;
  background: var(--bg-primary) !important;
  border: 1px solid var(--border-color) !important;
  border-radius: 16px !important;
  z-index: 9999 !important;
  box-shadow: 0 4px 24px rgba(0,0,0,0.3) !important;
  overflow: hidden !important;
}

.emoji-search {
  width: 100% !important;
  padding: 10px 14px !important;
  border: none !important;
  border-bottom: 1px solid var(--border-color) !important;
  background: var(--bg-secondary) !important;
  color: var(--text-primary) !important;
  font-size: 14px !important;
  outline: none !important;
}

.emoji-grid {
  display: grid !important;
  grid-template-columns: repeat(6, 1fr) !important;
  gap: 4px !important;
  padding: 8px !important;
  max-height: 260px !important;
  overflow-y: auto !important;
}

.emoji-grid button {
  padding: 8px 4px !important;
  font-size: 13px !important;
  font-family: monospace !important;
  background: none !important;
  border: 1px solid var(--border-color) !important;
  border-radius: 8px !important;
  cursor: pointer !important;
  color: var(--text-primary) !important;
  text-align: center !important;
}

.emoji-grid button:hover {
  background: var(--accent-bg) !important;
  border-color: var(--accent) !important;
}

/* Mobile compact */
@media (max-width: 640px) {
  .avatar-sm { width: 28px; height: 28px; }
  .avatar-md { width: 34px; height: 34px; }
  .avatar-lg { width: 40px; height: 40px; }
}