/* BLDC Motor Tools - Main Stylesheet */

:root {
  --primary-color: #2c5aa0;
  --primary-dark: #1e3d6f;
  --accent-color: #4a90d9;
  --text-color: #333;
  --text-light: #666;
  --bg-color: #f5f7fa;
  --card-bg: #fff;
  --border-color: #ddd;
  --success-color: #28a745;
  --warning-color: #ffc107;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background: var(--bg-color);
}

/* Header */
header {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  color: white;
  padding: 1rem 2rem;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

header h1 {
  font-size: 1.5rem;
  font-weight: 600;
}

header h1 a {
  color: white;
  text-decoration: none;
}

/* Navigation */
nav {
  background: var(--primary-dark);
  padding: 0;
}

nav ul {
  list-style: none;
  display: flex;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

nav li {
  position: relative;
}

nav a {
  display: block;
  color: rgba(255,255,255,0.9);
  text-decoration: none;
  padding: 0.75rem 1.25rem;
  transition: background 0.2s, color 0.2s;
  font-size: 0.95rem;
}

nav a:hover, nav a.active {
  background: var(--accent-color);
  color: white;
}

/* Main Content */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

h1 {
  color: var(--primary-dark);
  margin-bottom: 1rem;
  font-size: 2rem;
}

h2 {
  color: var(--primary-color);
  margin: 1.5rem 0 1rem;
  font-size: 1.4rem;
  border-bottom: 2px solid var(--accent-color);
  padding-bottom: 0.5rem;
}

h3 {
  color: var(--primary-dark);
  margin: 1rem 0 0.5rem;
  font-size: 1.1rem;
}

p {
  margin-bottom: 1rem;
}

/* Cards */
.card {
  background: var(--card-bg);
  border-radius: 8px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  border: 1px solid var(--border-color);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

/* Calculator Styles */
.calculator {
  background: var(--card-bg);
  border-radius: 8px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  border: 1px solid var(--border-color);
}

.calculator h3 {
  margin-top: 0;
  color: var(--primary-color);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
}

.calc-row {
  display: flex;
  align-items: center;
  margin: 0.75rem 0;
  gap: 0.5rem;
}

.calc-row label {
  min-width: 140px;
  font-weight: 500;
}

.calc-row input[type="number"],
.calc-row input[type="text"] {
  width: 120px;
  padding: 0.5rem;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-size: 1rem;
}

.calc-row input:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 2px rgba(74, 144, 217, 0.2);
}

.calc-row .unit {
  color: var(--text-light);
  font-size: 0.9rem;
  min-width: 80px;
}

.calc-row.result input {
  background: #e8f4fd;
  font-weight: 600;
  color: var(--primary-dark);
}

.calc-row.result label {
  color: var(--primary-color);
}

.btn-group {
  display: flex;
  gap: 0.5rem;
  margin-top: 1rem;
}

button {
  padding: 0.5rem 1rem;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.9rem;
  transition: background 0.2s, transform 0.1s;
}

button:active {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--primary-color);
  color: white;
}

.btn-primary:hover {
  background: var(--primary-dark);
}

.btn-secondary {
  background: #e9ecef;
  color: var(--text-color);
}

.btn-secondary:hover {
  background: #dee2e6;
}

.btn-demo {
  background: var(--success-color);
  color: white;
}

.btn-demo:hover {
  background: #218838;
}

/* Formula Display */
.formula {
  background: #f8f9fa;
  border-left: 4px solid var(--accent-color);
  padding: 1rem;
  margin: 1rem 0;
  font-family: 'Courier New', monospace;
  border-radius: 0 4px 4px 0;
}

/* Winding Scheme Styles */
.scheme-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.scheme-card {
  background: var(--card-bg);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  border: 1px solid var(--border-color);
}

.scheme-card h3 {
  background: var(--primary-color);
  color: white;
  padding: 0.75rem 1rem;
  margin: 0;
}

.scheme-card .content {
  padding: 1rem;
}

.scheme-card canvas {
  display: block;
  margin: 1rem auto;
  border: 1px solid var(--border-color);
  border-radius: 4px;
}

.scheme-card p {
  font-size: 0.95rem;
  color: var(--text-light);
}

/* Winding Calculator */
.winding-calc {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
}

.winding-inputs {
  flex: 1;
  min-width: 250px;
}

.winding-output {
  flex: 2;
  min-width: 400px;
}

#winding-canvas {
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: white;
}

.winding-info {
  margin-top: 1rem;
  padding: 1rem;
  background: #f8f9fa;
  border-radius: 4px;
}

/* Delta/Wye Section */
.termination-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin: 1.5rem 0;
}

.termination-card {
  text-align: center;
  padding: 1.5rem;
  background: var(--card-bg);
  border-radius: 8px;
  border: 1px solid var(--border-color);
}

.termination-card canvas {
  margin: 1rem auto;
}

.termination-card h4 {
  color: var(--primary-color);
  margin-bottom: 0.5rem;
}

/* Responsive */
@media (max-width: 768px) {
  nav ul {
    flex-wrap: wrap;
  }

  .termination-grid {
    grid-template-columns: 1fr;
  }

  .calc-row {
    flex-wrap: wrap;
  }

  .calc-row label {
    min-width: 100%;
    margin-bottom: 0.25rem;
  }
}

/* Table Styles */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  background: white;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

th, td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

th {
  background: var(--primary-color);
  color: white;
  font-weight: 600;
}

tr:hover {
  background: #f8f9fa;
}

/* Select Styles */
select {
  padding: 0.5rem;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-size: 1rem;
  background: white;
}

select:focus {
  outline: none;
  border-color: var(--accent-color);
}

/* Section Dividers */
.section-divider {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: 2rem 0;
}

/* Efficiency Calculator Grid */
.efficiency-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.efficiency-inputs, .efficiency-outputs {
  background: #f8f9fa;
  padding: 1rem;
  border-radius: 8px;
}

@media (max-width: 900px) {
  .efficiency-grid {
    grid-template-columns: 1fr;
  }
}

/* Color coding for winding table */
.winding-good { background-color: #cce5ff; }
.winding-ok { background-color: #fff; }
.winding-poor { background-color: #f8d7da; }
.winding-bad { background-color: #343a40; color: white; }

/* Slider styles */
input[type="range"] {
  width: 100%;
  margin: 0.5rem 0;
}

/* Footer */
footer {
  background: var(--primary-dark);
  color: rgba(255,255,255,0.8);
  text-align: center;
  padding: 1.5rem;
  margin-top: 2rem;
}

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