:root {
  --bg: #f7f8fa;
  --surface: #ffffff;
  --text: #1a1d23;
  --text-muted: #6b7280;
  --border: #e5e7eb;
  --accent: #5865f2;
  --accent-hover: #4752c4;
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "Segoe UI", sans-serif;
  overflow-x: hidden;
}

h1, h2, h3 {
  margin: 0;
}

.view {
  min-height: 100vh;
  padding: 24px;
  max-width: 720px;
  margin: 0 auto;
}

/* 방 목록 화면 */

.rooms-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.search-input {
  flex: 1;
  min-width: 160px;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 16px;
  background: var(--surface);
  color: var(--text);
}

.room-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 12px;
}

.room-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  cursor: pointer;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
  transition: box-shadow 0.15s ease, transform 0.15s ease;
}

.room-card:hover {
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  transform: translateY(-1px);
}

.room-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 6px;
}

.room-card-name {
  font-weight: 600;
  font-size: 15px;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.lock-icon {
  font-size: 13px;
  flex-shrink: 0;
}

.room-card-meta {
  color: var(--text-muted);
  font-size: 13px;
}

.empty-state {
  flex-direction: column;
  align-items: center;
  gap: 16px;
  color: var(--text-muted);
  padding: 64px 16px;
  text-align: center;
}

.fab {
  position: fixed;
  right: 24px;
  bottom: 24px;
  border: none;
  border-radius: 999px;
  padding: 14px 20px;
  background: var(--accent);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
  transition: background 0.15s ease;
}

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

/* 버튼 / 입력 공통 */

.btn {
  border: none;
  border-radius: var(--radius);
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease, opacity 0.15s ease;
}

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

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

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

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

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

.text-input {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 16px;
  margin-bottom: 12px;
  background: var(--surface);
  color: var(--text);
}

.field-label {
  display: block;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 14px;
  margin: 12px 0;
}

.error-text {
  color: #e5484d;
  font-size: 13px;
  min-height: 18px;
  margin: 0 0 8px;
}

/* 모달 */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  animation: fade-in 0.15s ease;
  z-index: 10;
}

@keyframes fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

.modal {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 24px;
  width: 100%;
  max-width: 360px;
}

.modal h3 {
  margin-bottom: 16px;
  font-size: 16px;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 8px;
}

/* 통화 화면 */

.call-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 24px;
}

.call-header h2 {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.call-header .btn {
  flex-shrink: 0;
}

.participant-list {
  list-style: none;
  padding: 0;
  margin: 0 0 32px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.participant-item {
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 16px;
  font-size: 14px;
  transition: border-color 0.15s ease;
}

.participant-item.speaking {
  border-color: var(--accent);
}

.call-controls {
  display: flex;
  justify-content: center;
}

/* 반응형 */

@media (max-width: 480px) {
  .view {
    padding: 16px;
  }

  .room-list {
    grid-template-columns: 1fr;
  }

  .fab {
    right: 16px;
    bottom: 16px;
  }
}