:root {
  --bgcolor: rgb(13, 17, 23);
  --card-bg: #161b22;
  --textcolor: rgb(240, 246, 252);
  --accent: #8b5cf6;
  --border: 1px solid #30363d;
  --border-radius: 12px;
  --box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  --bg-brightness: 0.65;
}
/* learn this from method week 2 Tutorials */
body {
  font-family: 'Inter', sans-serif, Arial, Helvetica;
  background: var(--bgcolor);
  color: var(--textcolor);
  margin: 0;
  padding: 2rem;
  font-size: 1.05rem;
}
/* Start of grid layout pattern from Grid by method Example */
.app-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr); 
  gap: 1.5rem;
  /* End of grid layout pattern from Grid by method Example */
  max-width: 1300px;
  margin: 0 auto;
  padding: 2rem;
}
/* learn this from method Tutorials */
.calculator-box { grid-column: 1; grid-row: 1; }
.sleep-debt-meter { grid-column: 1; grid-row: 2; }
#resultBox { grid-column: 2 / 4; grid-row: 1; }
.productivity-input { grid-column: 2; grid-row: 2; }
.chronotype-result { grid-column: 3; grid-row: 2; }
.relaxation-panel { grid-column: 2; grid-row: 3; }
.site-description { grid-column: 3; grid-row: 3;}

.calculator-box,
.sleep-debt-meter,
.productivity-input,
.chronotype-result,ss
.relaxation-panel
#resultBox {
  border: var(--border);
  border-radius: var(--border-radius);
  padding: 1.5rem;
  box-shadow: var(--box-shadow);
  background: var(--card-bg);
  margin-bottom: 0; 
}

.site-description {

  border: var(--border);
  border-radius: var(--border-radius);
  padding: 1.5rem;
  box-shadow: var(--box-shadow);
  background: var(--card-bg);
}

.site-description h3 {
  font-size: 1.5rem;
  margin-bottom: 10px;
}

.site-description p {
  font-size: 1rem;
  color: var(--textcolor);
  line-height: 1.5;
}

#bg-image {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  opacity: 0.65; 
  filter: brightness(var(--bg-brightness)) contrast(130%) grayscale(20%);
  background-size: cover;
  background-position: center;
}


.light-mode #bg-image {
  filter: 
    brightness(0.85)
    contrast(120%)
    grayscale(70%);
}

.light-mode {
  --bgcolor: #f8fafc;
  --card-bg: #ffffff;
  --textcolor: #1e293b;    
  --accent: #6d28d9;       
  --border: 1px solid #e2e8f0;
  --bg-brightness: 0.9;      
}

.light-mode body {
  color: var(--textcolor);
}

.light-mode .cycle-item {
  background: var(--card-bg);
  border-color: #cbd5e1;
}

#cycleResults {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.cycle-item {
  background: #2d3748;
  padding: 1rem;
  border-radius: 8px;
  flex: 1;
  min-width: 120px;
}

.debt-bar {
  height: 15px;
  background: var(--accent);
  transition: width 0.5s ease;
  border-radius: 8px;
  margin: 0.7rem;
}

.light-mode {
  --bgcolor: #f8fafc;
  --card-bg: #ffffff;
  --textcolor: #1e293b;
  --border: 1px solid #e2e8f0;
}

input, select {
  /* learn this from method week 4 Tutorials */
  background: var(--card-bg) !important;
  color: var(--textcolor) !important;
  border: 2px solid #cbd5e1
}



button, input {
  color: var(--textcolor);
}

button {
  background: var(--accent);
  color: white;
  border: 2px solid transparent;
  padding: 0.8rem 1.2rem;
  margin: 0.5rem;
  border-radius: 8px;
  /* learn this from method Tutorials */
  transition: background 0.3s ease;
}

button:hover {
  background: #6a41f3;
}

.light-mode button {
  border-color: rgba(0,0,0,0.1); 
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.breathing-animation {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: var(--accent);
  margin: 1rem auto;
  animation: breathe 4s infinite;
}
/* learn this from weekly Tutorials */
@keyframes fadeInBackground {
  from {
    opacity: 0;
    transform: scale(1.1); 
  }
  to {
    opacity: 0.4;
    transform: scale(1);
  }
}

.light-mode #bg-image {
  filter: brightness(0.85) contrast(120%) grayscale(70%);
}

/* Start of breathing animation code from CSS Tricks */
@keyframes breathe {
  0%, 100% { transform: scale(0.9); }
  50% { transform: scale(1.1); }
}
/* End of breathing animation code from CSS Tricks */

/* learn this from method week 8 Tutorials */
@media (max-width: 820px) {
  .app-container {
    grid-template-columns: 1fr;
    padding: 1rem;
    gap: 1rem;
  }
}
/* learn this from method weekly Tutorials */
@media (max-width: 1200px) {
  .app-container {
    grid-template-columns: repeat(2, 1fr);
  }
}