:root {
  --primary-color: #4caf50;
  --secondary-color: #f44336;
  --accent-color: #2196f3;
  --bg-color: #f0f2f5;
  --card-bg: #ffffff;
  --text-color: #333333;
  --border-radius: 10px;
  --transition-speed: 0.3s;
  --header-bg: linear-gradient(135deg, #2196f3, #4caf50);
  --input-bg: #fafafa;
  --input-border: #ccc;
}

body {
  margin: 0;
  padding: 10px 15px;
  font-family: 'Montserrat', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: var(--bg-color);
  color: var(--text-color);
}

.brand-logo {
  display: block;
  margin: 0 auto 10px auto;
  max-width: 35px;
  height: auto;
}

/* make everything a bit more spacious on phones */
@media (max-width: 480px) {
  body {
    padding: 10px;
  }
  .card {
    padding: 18px;
  }
  .btn-group {
    flex-direction: column;
    gap: 8px;
  }
  button {
    width: 100%;
  }
  input,
  select {
    width: 100%;
    font-size: 0.95rem;
  }
  .delay-row {
    flex-direction: column;
    align-items: stretch;
  }
  .switch {
    width: 80px;
    height: 40px;
  }
  .switch:after {
    width: 36px;
    height: 36px;
  }
  .brand-logo {
    max-width: 28px;
  }
}

header.app-header {
  text-align: center;
  padding: 30px 10px;
  background: var(--header-bg);
  color: white;
  border-radius: var(--border-radius);
  box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

header.app-header .subtitle {
  margin: 0;
  font-weight: 400;
  opacity: 0.9;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 10px;
}

.cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

@media (min-width: 768px) {
  .cards {
    grid-template-columns: 1fr 1fr;
  }
}

.app-footer {
  text-align: center;
  margin-top: 30px;
  font-size: 0.9rem;
  color: #666;
}

.container {
  max-width: 800px;
  margin: 0 auto;
}

/* header styling moved to app-header */

.card {
  background: var(--card-bg);
  padding: 25px;
  margin-bottom: 0;
  border-radius: var(--border-radius);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.12);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

.card:hover {
  transform: translateY(-2px) scale(1.01);
  box-shadow: 0 6px 12px rgba(0,0,0,0.16);
}

.card h2 {
  margin-top: 0;
  color: var(--accent-color);
  font-weight: 600;
  font-size: 1.4rem;
}

.btn-group {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 15px;
}

button {
  padding: 12px 22px;
  margin: 0;
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: background var(--transition-speed), transform var(--transition-speed);
}

button:active {
  transform: scale(0.98);
}

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

button.primary:hover {
  background: #45a049;
}

button.secondary {
  background: var(--secondary-color);
  color: #fff;
}

button.secondary:hover {
  background: #e53935;
}

.indicator {
  display: inline-block;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  margin-left: 12px;
  background: gray;
  transition: background var(--transition-speed);
}

/* wall switch style */
.switch-container {
  display: flex;
  justify-content: center;
  margin-bottom: 15px;
}

input[type="checkbox"] {
  display: none;
}

.switch {
  position: relative;
  display: inline-block;
  width: 60px;
  height: 34px;
  background: #ccc;
  border-radius: 34px;
  transition: background var(--transition-speed);
  cursor: pointer;
}

.switch:after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 30px;
  height: 30px;
  background: white;
  border-radius: 50%;
  transition: transform var(--transition-speed);
}

input[type="checkbox"]:checked + .switch {
  background: var(--primary-color);
}

input[type="checkbox"]:checked + .switch:after {
  transform: translateX(26px);
}

.indicator.on {
  background: green;
}

.indicator.off {
  background: red;
}

.delay-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 15px;
}

.visually-hidden {
  position: absolute;
  left: -9999px;
}

input,
select {
  padding: 8px 10px;
  border: 1px solid var(--input-border);
  border-radius: var(--border-radius);
  background: var(--input-bg);
  font-size: 1rem;
  transition: border-color var(--transition-speed);
}

input:focus,
select:focus {
  outline: none;
  border-color: var(--accent-color);
}

#timerDisplay {
  margin-top: 10px;
  font-size: 1.2rem;
  font-weight: bold;
  color: var(--accent-color);
}