/* Reset và base styles */
body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  padding: 20px;
  background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
  min-height: 100vh;
  color: #212529;
  overflow: hidden; 
}

/* Layout container */
.container {
  display: flex;
  gap: 25px;
  max-width: 1400px;
  margin: 0 auto;
  align-items: flex-start;
}

/* Tiêu đề */
h2 {
  text-align: center;
  margin-bottom: 25px;
  font-size: 2.2rem;
  color: #495057;
  position: relative;
  padding-bottom: 10px;
}

h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100px;
  height: 4px;
  background: linear-gradient(90deg, #3a86ff, #8338ec);
  border-radius: 2px;
}

/* Cột trái - TĂNG KHÔNG GIAN */
.left {
  flex: 1.5; /* Tăng flex-grow */
  min-width: 500px; /* Tăng min-width */
  display: flex;
  flex-direction: column;
  gap: 25px;
}

/* Controls panel */
.controls {
  padding: 25px;
  background: white;
  border-radius: 12px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 15px;
}

.controls label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 600;
  color: #495057;
}

.controls input {
  width: 80px;
  padding: 8px 12px;
  border: 1px solid #dee2e6;
  border-radius: 8px;
  transition: all 0.3s ease;
}

.controls input:focus {
  border-color: #3a86ff;
  box-shadow: 0 0 0 3px rgba(58, 134, 255, 0.2);
  outline: none;
}

/* Signal container - NẰM CẠNH NHAU */
.signal-container {
  display: flex;
  width: 100%;
  gap: 20px;
  margin: 0;
  padding: 0;
}

.signal {
  flex: 1;
  background: white;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
  min-width: 0;
}

.signal h3 {
  margin-top: 0;
  color: #3a86ff;
}

/* Cột phải - GIẢM KÍCH THƯỚC */
.right {
  flex: 1; /* Giảm flex-grow */
  min-width: 400px; /* Giảm min-width */
  padding: 20px;
  background: white;
  border-radius: 15px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
  border: 1px solid rgba(0, 0, 0, 0.05);
  position: sticky;
  top: 20px;
}

/* Đồ thị - ĐIỀU CHỈNH LẠI */
#graph {
  width: 100%;
  height: 400px; /* Giảm chiều cao */
  border-radius: 12px;
  background: #f8f9fa;
}

#x_signal, #y_signal {
  width: 100%;
  height: 200px; /* Tăng chiều cao cho rõ */
  border-radius: 8px;
  margin-top: 15px;
  background: #f8f9fa;
}

/* Hiệu ứng hover */
.right:hover {
  transform: translateY(-3px);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
}

.signal:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
}

/* Responsive cho màn hình nhỏ */
@media (max-width: 1200px) {
  .container {
    flex-direction: column;
  }
  
  .right {
    width: 100%;
    min-width: unset;
  }
}