:root {
    --warm-mango: #FFC078;        
    --coral-pink: #FF9B85;            
    --sunburst-yellow: #FFD166;           
}

body {
  background-color: #38A3A5; /* Vibrant, bright ocean teal */
  color: #221510;            /* Rich dark espresso text */
  font-family: sans-serif;
  margin: 0;
  padding: 40px 20px;
}

/* Header Container with Frosted Backdrop */
.hub-header {
  text-align: center;
  max-width: 580px;
  margin: 0 auto 36px auto;
  background-color: rgba(255, 255, 255, 0.22);
  backdrop-filter: blur(8px);
  padding: 24px 28px;
  border-radius: 20px;
  border: 2px solid rgba(255, 255, 255, 0.4);
}

.hub-header h1 {
  color: #FFF8E7; /* Crisp warm butter-cream */
  font-size: 2.3rem;
  margin: 0 0 8px 0;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
}

.hub-header p {
  font-size: 1.05rem;
  color: #FFFFFF;
  margin: 0;
  line-height: 1.4;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.12);
}

/* Responsive Grid Layout */
.calculator-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
  max-width: 330px; /* Change to 920 when adding more cards (3 in a row) */
  margin: 0 auto;
}

/* Bright & Cheerful Base Cards */
.calc-card {
  border: 3px solid #221510;     /* Crisp espresso border */
  border-radius: 18px;
  padding: 26px;
  text-decoration: none;
  color: #221510;
  display: flex;
  flex-direction: column;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.calc-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

.calc-card h3 {
  margin: 0 0 10px 0;
  font-size: 1.4rem;
}

.calc-card p {
  font-size: 0.95rem;
  line-height: 1.5;
  margin: 0 0 22px 0;
  flex-grow: 1;
  opacity: 0.92;
}

/* Brightened, Colorful Card Backgrounds */
.calc-card.card1 {
  background-color: var(--warm-mango);
}

.calc-card.card2 {
  background-color: var(--coral-pink);
}

.calc-card.card3 {
  background-color: var(--sunburst-yellow);
}

/* "Open Calculator" Badge-Style Action Button */
.card-link {
  align-self: flex-start;
  background-color: #221510;
  color: #FFFFFF;
  font-weight: bold;
  font-size: 0.85rem;
  padding: 8px 16px;
  border-radius: 10px;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.calc-card:hover .card-link {
  background-color: #FFFFFF;
  color: #221510;
}


/* Navigation */
.nook-nav {
    width: 100%;
    max-width: 1050px;
    margin-bottom: 20px;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    background-color: #fdf6ae;
    border: 1.5px solid rgba(74, 40, 0, 0.12);
    border-radius: 14px;
    color: #4A2800;
    font-size: 0.85rem;
    font-weight: 700;
    text-decoration: none;
    box-shadow: 0 2px 0 rgba(74, 40, 0, 0.08);
    transition: transform 0.15s ease;
}