:root {
  --bg-dark: #0a0d14;
  --bg-card: #141720;
  --bg-card-hover: #1c2130;
  --border-color: #272f45;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --danger: #dc2626;
  --danger-hover: #b91c1c;
  --success: #16a34a;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-dark);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Landing / Join View */
.join-container {
  max-width: 520px;
  margin: 60px auto;
  padding: 32px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.5);
}

.join-header {
  text-align: center;
  margin-bottom: 24px;
}

.join-header h1 {
  font-size: 24px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 8px;
}

.join-header p {
  color: var(--text-muted);
  font-size: 14px;
}

.preview-box {
  width: 100%;
  height: 240px;
  background: #000;
  border-radius: 8px;
  overflow: hidden;
  position: relative;
  margin-bottom: 20px;
  border: 1px solid var(--border-color);
}

.preview-box video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scaleX(-1);
}

.preview-overlay {
  position: absolute;
  bottom: 12px;
  left: 12px;
  background: rgba(0,0,0,0.6);
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 12px;
  color: #fff;
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.form-group input, .form-group select {
  width: 100%;
  padding: 10px 12px;
  background: var(--bg-dark);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: var(--text-main);
  font-size: 14px;
}

.form-group input:focus, .form-group select:focus {
  outline: none;
  border-color: var(--primary);
}

.btn-primary {
  width: 100%;
  padding: 12px;
  background: var(--primary);
  border: none;
  border-radius: 6px;
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}

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

/* Conference Room View */
.room-container {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

.top-bar {
  height: 52px;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
}

.room-title-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.room-title {
  font-size: 16px;
  font-weight: 600;
}

.room-badge {
  background: rgba(37, 99, 235, 0.2);
  color: #60a5fa;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 500;
}

.main-stage {
  flex: 1;
  display: flex;
  position: relative;
  overflow: hidden;
}

.video-grid {
  flex: 1;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 12px;
  padding: 16px;
  overflow-y: auto;
  align-content: center;
}

.video-tile {
  background: #000;
  border-radius: 8px;
  overflow: hidden;
  position: relative;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
}

.video-tile video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.video-tile.mirrored video {
  transform: scaleX(-1);
}

.tile-overlay {
  position: absolute;
  bottom: 8px;
  left: 8px;
  background: rgba(0,0,0,0.65);
  backdrop-filter: blur(4px);
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 12px;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 6px;
}

.tile-status-icon {
  width: 14px;
  height: 14px;
}

/* Sidebar Chat & Participant Panels */
.side-panel {
  width: 320px;
  background: var(--bg-card);
  border-left: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
}

.side-panel-header {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border-color);
  font-size: 14px;
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.chat-messages {
  flex: 1;
  padding: 14px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.chat-msg {
  background: rgba(255,255,255,0.03);
  padding: 8px 10px;
  border-radius: 6px;
  font-size: 13px;
}

.chat-sender {
  font-weight: 600;
  font-size: 11px;
  color: #93c5fd;
  margin-bottom: 2px;
}

.chat-input-bar {
  padding: 12px;
  border-top: 1px solid var(--border-color);
  display: flex;
  gap: 8px;
}

.chat-input-bar input {
  flex: 1;
  padding: 8px 12px;
  background: var(--bg-dark);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: var(--text-main);
  font-size: 13px;
}

/* Bottom Control Dock */
.control-dock {
  height: 68px;
  background: var(--bg-card);
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.dock-btn {
  background: var(--bg-dark);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-main);
  padding: 10px 14px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all 0.15s;
}

.dock-btn:hover {
  background: var(--bg-card-hover);
  border-color: #3b82f6;
}

.dock-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.dock-btn.danger {
  background: var(--danger);
  border-color: var(--danger);
  color: #fff;
}

.dock-btn.danger:hover {
  background: var(--danger-hover);
}