#cof_calculator {
  --bg: #f9f9f9;
  --card: #ffffff;
  --text: #1a1a1a;
  --muted: #6c757d;
  --accent: #007bff;
  --accent-2: #17a2b8;
  --border: #b0b0b0;
  --danger: #dc3545;
  --success: #28a745;
  --warning: #ffc107;
}

#cof_calculator * {
  box-sizing: border-box;
}

#cof_calculator {
  margin: 0;
  padding: 24px;
  width: 100%;
  max-width: 100%;
  min-height: 100vh;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ----------------------------
   Typography
---------------------------- */
#cof_calculator h1 {
  margin-bottom: 20px;
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.3px;
}

#cof_calculator h2 {
  margin-bottom: 14px;
  font-size: 20px;
  font-weight: 600;
  color: var(--accent);
}

#cof_calculator h3 {
  margin: 12px 0 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--accent-2);
}

/* ----------------------------
   Cards
---------------------------- */
#cof_calculator .card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px;
  margin-bottom: 24px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

#cof_calculator .card:hover {
  border-color: var(--accent);
  box-shadow: 0 2px 12px rgba(0, 123, 255, 0.08);
}

/* ----------------------------
   Grid Layouts
---------------------------- */
#cof_calculator .grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

#cof_calculator .grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 18px;
}

#cof_calculator .grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr); /* exactly 5 per row */
  gap: 8px; /* kam gap */
}


/* ----------------------------
   Labels & Inputs
---------------------------- */
#cof_calculator label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 13px;
  font-weight: 500;
  color: var(--muted);
}

#cof_calculator input,
#cof_calculator select {
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.06);
}

#cof_calculator input:focus,
#cof_calculator select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.2);
}

/* ----------------------------
   Hint Text
---------------------------- */
#cof_calculator .hint {
  color: var(--muted);
  font-size: 12px;
  margin-top: -4px;
  margin-bottom: 8px;
}

/* ----------------------------
   Action Buttons
---------------------------- */
#cof_calculator .actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 20px 0;
}

#cof_calculator button {
  padding: 10px 18px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: linear-gradient(180deg, #f0f0f0, #e0e0e0);
  color: var(--text);
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  transition: border-color 0.2s ease, transform 0.1s ease, background 0.2s ease;
}

#cof_calculator button:hover {
  border-color: var(--accent);
  background: linear-gradient(180deg, #e8f0ff, #d9eaff);
  transform: translateY(-1px);
}

#cof_calculator button:active {
  transform: translateY(0);
}

#cof_calculator button.secondary {
  background: transparent;
  border-color: var(--muted);
  color: var(--muted);
}

#cof_calculator button.secondary:hover {
  color: var(--accent);
  border-color: var(--accent);
}

/* ----------------------------
   Output Display
---------------------------- */
#cof_calculator pre#cof_output {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  white-space: pre-wrap;
  font-size: 13px;
  line-height: 1.5;
  font-family: Consolas, Monaco, monospace;
  overflow-x: auto;
  color: var(--text);
}

#cof_calculator pre#cof_output strong {
  color: var(--accent-2);
}

/* ----------------------------
   Media Queries / Responsive
---------------------------- */
@media (max-width: 1000px) {
  #cof_calculator .grid {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  }
}

@media (max-width: 600px) {
  #cof_calculator {
    padding: 16px;
  }

  #cof_calculator .grid,
  #cof_calculator .grid-2,
  #cof_calculator .grid.four {
    grid-template-columns: 1fr;
  }

  #cof_calculator h1 {
    font-size: 22px;
  }
}

/* Normal editable inputs */
#cof_calculator input[type="number"] {
  background-color: #fff;
  color: #000;
  border: 1px solid #ccc;
  padding: 6px;
  border-radius: 6px;
  transition: all 0.2s ease;
}

/* Readonly inputs (autofill case) */
#cof_calculator input[readonly] {
  background-color: #f0f0f0; /* light grey */
  color: #666;              /* dim text */
  border: 1px solid #bbb;
  cursor: not-allowed;
}

/* Optional: highlight editable fields on focus */
#cof_calculator input[type="number"]:focus {
  border-color: #007bff;
  box-shadow: 0 0 4px rgba(0, 123, 255, 0.4);
}

/* Make dropdown text smaller */
#cof_calculator select {
  font-size: 12px;   /* dropdown ke andar text chhota ho jayega */
  padding: 8px 10px; /* height bhi thodi kam ho jayegi */
}