:root {
  /* ===== BACKGROUND ===== */
  --bg-main: #eef6f1;
  --bg-main-gradient: #e3f0e9;

  /* ===== APP SURFACE ===== */
  --bg-app: #ffffff;
  --bg-card: #f0f7f4;
  --bg-input: #ffffff;
  --bg-button: #dceee5;
  --bg-button-hover: #cfe6da;

  /* ===== ACCENTS ===== */
  --accent-primary: #2f855a;
  --accent-success: #38a169;
  --accent-warning: #dd6b20;

  /* ===== TEXT ===== */
  --text-primary: #1f2937;
  --text-secondary: #374151;
  --text-muted: #6b7280;

  /* ===== RADIUS ===== */
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 10px;
}

* {
  box-sizing: border-box;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

body {
  margin: 0;
  height: 100vh;
  background: linear-gradient(
    180deg,
    var(--bg-main) 0%,
    var(--bg-main-gradient) 100%
  );
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
}

/* ===================== APP ===================== */

.app {
  width: 390px;
  background: var(--bg-app);
  padding: 22px;
  border-radius: var(--radius-lg);

  /* REAL CONTRAST */
  box-shadow: 0 30px 60px rgba(15, 23, 42, 0.18),
    0 6px 14px rgba(15, 23, 42, 0.08);
}

/* ===================== HEADING ===================== */

h1 {
  text-align: center;
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--text-primary);
}

/* ===================== CARD ===================== */

.card {
  background: var(--bg-card);
  padding: 14px;
  border-radius: var(--radius-md);
  margin-bottom: 14px;
  border: 1px solid rgba(0, 0, 0, 0.05);
}

.card h2 {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

/* ===================== TIME DISPLAY ===================== */

.time-display {
  font-size: 32px;
  font-weight: 600;
  text-align: center;
  color: var(--accent-primary);
  margin-bottom: 12px;
  letter-spacing: 1px;
}

/* ===================== CONTROLS ===================== */

.controls {
  display: flex;
  gap: 10px;
}

button {
  flex: 1;
  height: 36px;
  background: linear-gradient(180deg, var(--bg-button), #d4dbea);
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 14px;
  cursor: pointer;
  transition: all 0.12s ease;
}

button:hover {
  background: linear-gradient(180deg, var(--bg-button-hover), #c3cee2);
}

button:active {
  transform: translateY(-2px);
}
button:disabled{
  background: #c4c7c5;
  color: rgba(0, 0, 0, 0.4);
  cursor: none;
  pointer-events: none;
}

/* ===================== TIMER INPUTS ===================== */

.timer-inputs {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 6px;
  margin-bottom: 10px;
}

.timer-inputs input {
  width: 64px;
  height: 32px;
  text-align: center;
  font-size: 14px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(0, 0, 0, 0.15);
  background: var(--bg-input);
  color: var(--text-primary);
}

.timer-inputs input::placeholder {
  color: var(--text-muted);
}

.timer-inputs span {
  color: var(--text-muted);
  font-size: 16px;
}

/* ===================== ACCESSIBILITY ===================== */

button:focus-visible,
input:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}