* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: #0b1020;
  color: #f8fafc;
  font-family: Arial, sans-serif;
}

.app {
  max-width: 1500px;
  min-height: 100vh;
  margin: auto;
  padding: 5vh 6vw;
}

.brand {
  color: #67e8f9;
  font-size: 22px;
  font-weight: 800;
  letter-spacing: 4px;
}

.tagline, section > p {
  color: #a8b3c7;
}

h1 {
  font-size: clamp(32px, 4vw, 64px);
  margin-top: 50px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
  margin-top: 40px;
}

.routine {
  min-height: 240px;
  padding: 28px;
  text-align: left;
  color: white;
  background: #19243a;
  border: 3px solid transparent;
  border-radius: 20px;
  cursor: pointer;
}

.routine span {
  color: #67e8f9;
  font-size: 13px;
  letter-spacing: 2px;
}

.routine h2 {
  font-size: 28px;
  margin-top: 38px;
}

.routine p {
  color: #cbd5e1;
  font-size: 18px;
}

button {
  font: inherit;
}

button:focus-visible {
  outline: 4px solid #67e8f9;
  outline-offset: 5px;
  border-color: #67e8f9;
  transform: scale(1.02);
}

#timer {
  color: #67e8f9;
  font-size: clamp(64px, 12vw, 130px);
  font-weight: bold;
  margin: 30px 0;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.controls button, #again {
  padding: 16px 24px;
  border-radius: 12px;
  border: 0;
  cursor: pointer;
  background: #67e8f9;
  color: #0b1020;
  font-weight: bold;
}

[hidden] {
  display: none !important;
}

@media (max-width: 800px) {
  .cards {
    grid-template-columns: 1fr;
  }
}