:root {
  --bg: #0b0d12;
  --surface: #161a23;
  --surface-2: #1f2430;
  --fg: #f5f7fa;
  --muted: #8a93a6;
  --accent: #3ddc97;
  --warn: #f5a524;
  --alert: #e5243b;
  color-scheme: dark;
}

* { box-sizing: border-box; }

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

body {
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-tap-highlight-color: transparent;
}

[hidden] { display: none !important; }

.screen {
  width: min(100%, 28rem);
  margin: 0 auto;
  padding: max(1rem, env(safe-area-inset-top)) 1rem max(1.5rem, env(safe-area-inset-bottom));
}
.center {
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 1rem;
  text-align: center;
}

h1 { margin: 0 0 1rem; font-size: 2rem; }

.error { min-height: 1.2em; margin: 0; color: var(--alert); text-align: center; }

/* --- Botões --- */
.btn {
  border: 0;
  border-radius: 0.8rem;
  padding: 0.9rem 1rem;
  font: inherit;
  font-size: 1.1rem;
  font-weight: 700;
  background: var(--surface-2);
  color: var(--fg);
  cursor: pointer;
  touch-action: manipulation;
}
.btn:active:not(:disabled) { transform: scale(0.97); }
.btn:disabled { opacity: 0.35; cursor: default; }
.btn.primary { background: var(--accent); color: #062a1a; }
.btn.danger { background: #3a1419; color: #ff8a97; }
.btn.ghost { background: transparent; color: var(--muted); }
.btn.big { padding: 1.2rem 1rem; font-size: 1.25rem; }

.link {
  background: none;
  border: 0;
  color: var(--muted);
  font: inherit;
  text-decoration: underline;
  cursor: pointer;
}

/* --- Entrada do código --- */
.join-form { display: grid; gap: 0.8rem; }
.join-form label { color: var(--muted); }
.code-input {
  width: 100%;
  padding: 0.8rem;
  border: 2px solid var(--surface-2);
  border-radius: 0.8rem;
  background: var(--surface);
  color: var(--fg);
  font: inherit;
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: 0.4em;
  text-align: center;
  text-transform: uppercase;
}
.code-input:focus { outline: none; border-color: var(--accent); }

.message-title { margin: 0; font-size: 1.5rem; font-weight: 700; }
.message-text { margin: 0 0 1rem; color: var(--muted); }

/* --- Painel --- */
.panel { display: flex; flex-direction: column; gap: 1rem; }

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--muted);
}
.topbar strong { color: var(--fg); letter-spacing: 0.15em; }
.conn {
  display: inline-block;
  width: 0.6rem;
  height: 0.6rem;
  border-radius: 50%;
  background: var(--alert);
  vertical-align: middle;
}
.conn.online { background: var(--accent); }

.mirror {
  border-radius: 1rem;
  padding: 1rem;
  background: var(--surface);
  text-align: center;
  transition: background-color 0.2s;
}
.mirror-time {
  font-size: 4.5rem;
  font-weight: 800;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}
.mirror-label {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}
.mirror.phase-prep .mirror-time { color: var(--accent); }
.mirror.phase-warning { background: #4a1219; }
.mirror.phase-finished { background: var(--alert); }
.mirror.phase-finished .mirror-label { color: var(--fg); }
.mirror.is-paused .mirror-time { opacity: 0.5; }

/* --- Configuração --- */
.config {
  display: grid;
  gap: 1rem;
  margin: 0;
  padding: 0;
  border: 0;
  min-width: 0;
}
.config:disabled { opacity: 0.4; }

.steppers { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; }
.stepper {
  display: grid;
  grid-template-columns: 2.75rem 1fr 2.75rem;
  grid-template-rows: auto auto;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem;
  border-radius: 0.8rem;
  background: var(--surface);
}
.stepper-label {
  grid-column: 1 / -1;
  color: var(--muted);
  font-size: 0.8rem;
  text-align: center;
}
.step {
  height: 2.75rem;
  border: 0;
  border-radius: 0.6rem;
  background: var(--surface-2);
  color: var(--fg);
  font-size: 1.5rem;
  font-weight: 700;
  cursor: pointer;
  touch-action: manipulation;
}
.step-value {
  width: 100%;
  min-width: 0;
  border: 0;
  background: transparent;
  color: var(--fg);
  font: inherit;
  font-size: 1.8rem;
  font-weight: 800;
  text-align: center;
  font-variant-numeric: tabular-nums;
  -moz-appearance: textfield;
}
.step-value::-webkit-inner-spin-button,
.step-value::-webkit-outer-spin-button { -webkit-appearance: none; margin: 0; }
.step-value:focus { outline: 2px solid var(--accent); border-radius: 0.4rem; }

.group { display: grid; gap: 0.5rem; }
.group-label { color: var(--muted); font-size: 0.85rem; }
.chips { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0.5rem; }
.chip {
  padding: 0.75rem 0.25rem;
  border: 2px solid transparent;
  border-radius: 0.7rem;
  background: var(--surface);
  color: var(--fg);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  touch-action: manipulation;
}
.chip.selected { border-color: var(--accent); color: var(--accent); }

/* --- Som --- */
.toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: 100%;
  padding: 0.9rem 1rem;
  border: 0;
  border-radius: 0.8rem;
  background: var(--surface);
  color: var(--fg);
  font: inherit;
  text-align: left;
  cursor: pointer;
}
.toggle-text { display: grid; gap: 0.15rem; }
.toggle-text small { color: var(--muted); }
.toggle-text small.attention { color: var(--warn); }
.switch {
  position: relative;
  flex: none;
  width: 3rem;
  height: 1.75rem;
  border-radius: 999px;
  background: var(--surface-2);
  transition: background-color 0.2s;
}
.switch::after {
  content: "";
  position: absolute;
  top: 0.2rem;
  left: 0.2rem;
  width: 1.35rem;
  height: 1.35rem;
  border-radius: 50%;
  background: var(--fg);
  transition: transform 0.2s;
}
.toggle[aria-pressed="true"] .switch { background: var(--accent); }
.toggle[aria-pressed="true"] .switch::after { transform: translateX(1.25rem); }

.actions { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; }
.actions #btn-start { grid-column: 1 / -1; }