:root {
  --bg: #0b0e14;
  --bg-elevated: #131826;
  --bg-card: #161c2c;
  --border: #232a3d;
  --text: #e8ecf4;
  --text-dim: #8993a8;
  --text-faint: #5b647a;
  --accent: #4f8cff;
  --accent-hover: #6fa1ff;
  --accent-dim: #1c2b4d;
  --danger: #ff5d6c;
  --danger-hover: #ff7784;
  --success: #37d67a;
  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "Cascadia Mono", "Consolas", monospace;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
}

button {
  font-family: inherit;
}

.screen {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
}

.screen[hidden] { display: none !important; }
/* Author rules like .overlay { display: flex } would otherwise beat the UA [hidden] default. */
[hidden] { display: none !important; }

/* ---------- shared buttons ---------- */

.btn {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text);
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.05s ease;
}
.btn:hover { background: #1a2135; border-color: #2c344a; }
.btn:active { transform: scale(0.97); }
.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.btn-ghost { background: transparent; }
.btn-accent { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-accent:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn-danger { background: transparent; border-color: var(--danger); color: var(--danger); }
.btn-danger:hover { background: rgba(255, 93, 108, 0.12); }

/* ============ PIN screen ============ */

#screen-pin {
  align-items: center;
  justify-content: center;
  padding: 16px;
  background: radial-gradient(circle at 50% 20%, #17203a 0%, var(--bg) 65%);
}

.pin-card {
  width: 100%;
  max-width: 340px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--text-dim);
}

#pin-title {
  margin: 4px 0 0;
  font-size: 22px;
  font-weight: 700;
}

.pin-message {
  min-height: 20px;
  margin: 0;
  color: var(--text-dim);
  font-size: 13px;
  text-align: center;
}
.pin-message.is-error { color: var(--danger); }

.pin-dots {
  display: flex;
  gap: 12px;
  height: 16px;
}
.pin-dots .dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 1.5px solid var(--text-faint);
  background: transparent;
  transition: background 0.1s ease, border-color 0.1s ease, transform 0.1s ease;
}
.pin-dots .dot.filled {
  background: var(--accent);
  border-color: var(--accent);
  transform: scale(1.05);
}
.pin-dots.shake { animation: shake 0.4s ease; }
@keyframes shake {
  10%, 90% { transform: translateX(-2px); }
  20%, 80% { transform: translateX(4px); }
  30%, 50%, 70% { transform: translateX(-8px); }
  40%, 60% { transform: translateX(8px); }
}

.pin-pad {
  width: 100%;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-top: 6px;
}
.pin-key {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text);
  font-size: 22px;
  font-weight: 600;
  padding: 18px 0;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.1s ease, transform 0.05s ease;
}
.pin-key:hover { background: #1c233a; }
.pin-key:active { transform: scale(0.95); background: var(--accent-dim); }
.pin-key:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.pin-key-ghost { font-size: 14px; color: var(--text-dim); background: transparent; }

.pin-lockout {
  font-variant-numeric: tabular-nums;
}

/* ============ App grid screen ============ */

.grid-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.grid-header-right {
  display: flex;
  align-items: center;
  gap: 12px;
}
.grid-username {
  color: var(--text-dim);
  font-size: 14px;
}

.session-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin: 16px 24px 0;
  padding: 12px 16px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  font-size: 14px;
}

.app-grid {
  flex: 1;
  overflow-y: auto;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 16px;
  padding: 24px;
  align-content: start;
}

.app-tile {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 20px 12px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  color: var(--text);
  transition: transform 0.12s ease, border-color 0.12s ease, background 0.12s ease;
}
.app-tile:hover { transform: translateY(-2px); border-color: #2c344a; background: #1a2135; }
.app-tile:active { transform: translateY(0) scale(0.98); }
.app-tile:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.app-tile-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  object-fit: cover;
  background: var(--bg-elevated);
}
.app-tile-icon-letter {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  font-weight: 700;
  color: #fff;
}
.app-tile-name {
  font-size: 13px;
  font-weight: 600;
  text-align: center;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 100%;
}
.app-tile-dot {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 0 3px rgba(55, 214, 122, 0.18);
}
.app-tile-dot.pulse { animation: pulse 2s ease-in-out infinite; }
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.45; }
}

.app-grid-empty {
  color: var(--text-dim);
  font-size: 14px;
  padding: 40px;
  text-align: center;
  grid-column: 1 / -1;
}

/* ============ Stream screen ============ */

.screen-stream {
  background: #000;
}

#stream-video {
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: #000;
  display: block;
}

.toolbar {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: linear-gradient(to bottom, rgba(0, 0, 0, 0.75), transparent);
  transform: translateY(-100%);
  transition: transform 0.2s ease;
  z-index: 20;
}
.toolbar.visible,
.toolbar:focus-within {
  transform: translateY(0);
}
.toolbar-app-name {
  color: #fff;
  font-weight: 600;
  font-size: 14px;
}
.toolbar-actions {
  display: flex;
  gap: 8px;
}
.toolbar .btn {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.15);
  padding: 7px 12px;
  font-size: 13px;
}
.toolbar .btn:hover { background: rgba(255, 255, 255, 0.16); }
.toolbar .btn.active { background: var(--accent); border-color: var(--accent); }
.toolbar .btn-danger { border-color: var(--danger); color: var(--danger); background: rgba(255, 93, 108, 0.1); }

.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(6, 8, 14, 0.92);
  z-index: 30;
  padding: 16px;
}
.overlay-dim {
  background: rgba(6, 8, 14, 0.6);
  backdrop-filter: blur(1px);
}
.overlay-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  max-width: 360px;
  text-align: center;
  padding: 28px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.overlay-card p {
  margin: 0;
  font-size: 15px;
  color: var(--text);
  line-height: 1.5;
}
.overlay-actions {
  display: flex;
  gap: 10px;
}

.spinner {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.stats-hud {
  position: absolute;
  bottom: 12px;
  right: 12px;
  z-index: 25;
  background: rgba(6, 8, 14, 0.8);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.6;
  color: #b7e5c6;
  white-space: pre;
  pointer-events: none;
  max-width: 240px;
}

/* ============ settings panel ============ */

.settings-panel {
  position: absolute;
  top: 56px;
  right: 16px;
  z-index: 26;
  width: 300px;
  max-width: calc(100vw - 32px);
  max-height: calc(100vh - 88px);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  color: var(--text);
  pointer-events: auto;
}

.settings-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}
.settings-panel-header h2 {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
}
.settings-panel-close {
  appearance: none;
  border: none;
  background: transparent;
  color: var(--text-dim);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
}
.settings-panel-close:hover { background: rgba(255, 255, 255, 0.08); color: var(--text); }

.settings-row {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.settings-row-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.settings-row-label .settings-value {
  color: var(--text);
  font-family: var(--font-mono);
  text-transform: none;
  letter-spacing: normal;
}

.settings-slider {
  width: 100%;
  accent-color: var(--accent);
  height: 24px;
}

.settings-segmented {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.settings-segmented button {
  appearance: none;
  flex: 1 1 auto;
  min-height: 40px;
  min-width: 44px;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text);
  font-size: 13px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.12s ease, border-color 0.12s ease;
}
.settings-segmented button:hover { background: #1c233a; }
.settings-segmented button.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.settings-segmented button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.settings-checkbox-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
}
.settings-checkbox-row input[type="checkbox"] {
  width: 20px;
  height: 20px;
  accent-color: var(--accent);
}

.settings-footer {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-top: 8px;
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--text-dim);
  font-family: var(--font-mono);
}
.settings-reset-btn {
  align-self: flex-start;
}

/* ============ mobile ============ */

@media (max-width: 480px) {
  .pin-card { max-width: 100%; }
  .pin-key { padding: 16px 0; font-size: 20px; }
  .grid-header { padding: 12px 16px; }
  .app-grid { padding: 16px; gap: 12px; grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); }
  .session-banner { margin: 12px 16px 0; flex-direction: column; align-items: stretch; }
  .toolbar-app-name { display: none; }
  .settings-panel {
    top: 52px;
    right: 8px;
    left: 8px;
    width: auto;
    max-width: none;
    max-height: calc(100vh - 68px);
  }
}