:root {
  --color-primary: #2b2b7a;
  --color-bg: #f4f4f8;
  --color-card: #ffffff;
  --color-text: #333333;
  --color-done: #1f8a4c;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
}

.container {
  max-width: 420px;
  margin: 40px auto;
  background-color: var(--color-card);
  border-radius: 12px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
  overflow: hidden;
}

header {
  background-color: var(--color-primary);
  color: white;
  text-align: center;
  padding: 28px 20px;
}

header h1 {
  margin: 0 0 6px;
}

.subtitle {
  margin: 0;
  opacity: 0.85;
  font-size: 14px;
}

main {
  padding: 28px;
  text-align: center;
}

.setup {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 20px;
}

.setup label {
  font-size: 14px;
  color: #555;
}

#minutesInput {
  width: 70px;
  padding: 8px 10px;
  font-size: 15px;
  border: 1px solid #ccc;
  border-radius: 6px;
  text-align: center;
}

#minutesInput:disabled {
  background-color: var(--color-bg);
  color: #999;
}

#timeDisplay {
  font-size: 56px;
  font-weight: bold;
  color: var(--color-primary);
  margin: 10px 0;
  font-variant-numeric: tabular-nums;
}

.progress-track {
  height: 10px;
  background-color: var(--color-bg);
  border-radius: 5px;
  overflow: hidden;
  margin-bottom: 14px;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background-color: var(--color-primary);
  transition: width 1s linear;
}

.status {
  min-height: 22px;
  font-weight: bold;
  color: var(--color-done);
  margin: 0 0 16px;
}

.controls {
  display: flex;
  justify-content: center;
  gap: 10px;
}

button {
  padding: 10px 20px;
  background-color: var(--color-primary);
  color: white;
  border: none;
  border-radius: 6px;
  font-weight: bold;
  cursor: pointer;
}

button:disabled {
  background-color: #ccc;
  cursor: not-allowed;
}

footer {
  text-align: center;
  padding: 16px;
  font-size: 13px;
  color: #777;
  border-top: 1px solid var(--color-bg);
}

footer a {
  color: var(--color-primary);
}