:root {
  color-scheme: light dark;
  --bg: #f5f5f7;
  --card-bg: #ffffff;
  --text: #1c1c1e;
  --muted: #6b6b70;
  --border: #e2e2e5;
  --accent: #3b7cf6;
  --accent-text: #ffffff;
  --danger: #e5484d;
  --success: #2fb344;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17171a;
    --card-bg: #232326;
    --text: #f2f2f3;
    --muted: #96969c;
    --border: #333338;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

.screen {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px;
}

h1 {
  font-size: 20px;
  margin: 0 0 4px;
}

.muted {
  color: var(--muted);
  font-size: 13px;
}

label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  margin: 14px 0 6px;
}

label:first-of-type {
  margin-top: 4px;
}

input {
  width: 100%;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
}

input:focus {
  outline: 2px solid var(--accent);
  outline-offset: -1px;
}

button {
  border: none;
  border-radius: 8px;
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  background: var(--accent);
  color: var(--accent-text);
  width: 100%;
  margin-top: 14px;
}

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

button:active {
  transform: scale(0.99);
}

.button-row {
  display: flex;
  gap: 10px;
}

.button-row button {
  margin-top: 14px;
}

details summary {
  cursor: pointer;
  font-size: 12px;
  color: var(--muted);
  margin-top: 10px;
}

#call-form {
  display: flex;
  gap: 8px;
}

#call-form input {
  flex: 1;
}

#call-form button {
  width: auto;
  margin-top: 0;
  white-space: nowrap;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.me-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.me-username {
  font-size: 20px;
  font-weight: 700;
}

.icon-btn {
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: 999px;
  background: var(--card-bg);
  color: var(--text);
  border: 1px solid var(--border);
  font-size: 16px;
  margin-top: 0;
}

.list-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin-bottom: 10px;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: var(--muted);
}

.status-dot.online {
  background: var(--success);
}

.status-dot.offline {
  background: var(--danger);
}

.user-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.user-list li.empty {
  color: var(--muted);
  font-size: 13px;
  padding: 4px 0;
}

.user-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 10px;
  border-radius: 8px;
  background: var(--bg);
}

.user-row .name {
  font-size: 14px;
  font-weight: 500;
}

.user-row button {
  width: auto;
  margin-top: 0;
  padding: 6px 14px;
  font-size: 13px;
}

.status-text {
  text-align: center;
  min-height: 16px;
}

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.call-card {
  width: 100%;
  max-width: 320px;
  text-align: center;
}

.ringing {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  font-weight: 700;
}

.incoming-from {
  font-size: 24px;
  font-weight: 700;
  margin: 8px 0 4px;
}

#decline-call {
  color: var(--danger);
}

#accept-call {
  background: var(--success);
}

.center {
  text-align: center;
}

.user-row {
  gap: 10px;
}

.user-row .name {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.presence {
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: var(--border);
}

.presence.online {
  background: var(--success);
}

.user-row button.remove {
  width: 28px;
  height: 28px;
  padding: 0;
  color: var(--muted);
}

button:disabled {
  opacity: 0.5;
  cursor: default;
}

button.add-contact {
  display: block;
  margin: 12px auto 0;
}

.error {
  color: var(--danger);
  font-size: 13px;
  margin: 10px 0 0;
}

button.link-btn {
  display: inline;
  width: auto;
  margin: 0;
  padding: 0;
  background: none;
  color: var(--accent);
  font: inherit;
  font-weight: 600;
}

[hidden] {
  display: none !important;
}